diff --git a/Cargo.lock b/Cargo.lock
index 5f83936c..8ee4cd6f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1160,7 +1160,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_builtins"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "chrono",
  "fast-float",
@@ -1185,7 +1185,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_bytecode"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "num-bigint",
  "oxide_log",
@@ -1193,7 +1193,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_cfg"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "oxide_bytecode",
  "oxide_emit",
@@ -1204,7 +1204,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_cli"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "ansi_term",
  "bumpalo",
@@ -1228,7 +1228,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_code_cache"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "lru",
  "oxide_bytecode",
@@ -1237,7 +1237,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_compiler"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "oxide_bytecode",
  "oxide_cfg",
@@ -1257,7 +1257,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_dce"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "oxide_bytecode",
  "oxide_cfg",
@@ -1271,7 +1271,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_emit"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "num-bigint",
  "oxc_allocator",
@@ -1286,7 +1286,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_engine"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "oxide_bytecode",
  "oxide_compiler",
@@ -1298,7 +1298,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_ir"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "oxide_bytecode",
  "oxide_log",
@@ -1307,7 +1307,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_kernel"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "bumpalo",
  "dashmap",
@@ -1321,7 +1321,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_liveness"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "oxide_bytecode",
  "oxide_cfg",
@@ -1333,7 +1333,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_log"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "tracing",
  "tracing-appender",
@@ -1342,11 +1342,11 @@ dependencies = [
 
 [[package]]
 name = "oxide_net"
-version = "0.15.9"
+version = "0.15.10"
 
 [[package]]
 name = "oxide_parser"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "oxc_allocator",
  "oxc_ast",
@@ -1361,7 +1361,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_regalloc"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "oxide_bytecode",
  "oxide_cfg",
@@ -1377,7 +1377,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_runtime_api"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "num-bigint",
  "num-traits",
@@ -1390,7 +1390,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_test262"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "oxide_bytecode",
  "oxide_compiler",
@@ -1408,7 +1408,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_types"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "bumpalo",
  "dashmap",
@@ -1421,7 +1421,7 @@ dependencies = [
 
 [[package]]
 name = "oxide_vm"
-version = "0.15.9"
+version = "0.15.10"
 dependencies = [
  "bumpalo",
  "chrono",
diff --git a/Cargo.toml b/Cargo.toml
index d29e83cc..17158a10 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,7 +24,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.15.9"
+version = "0.15.10"
 edition = "2021"
 license = "MIT"
 rust-version = "1.80"
diff --git a/crates/oxide_cli/src/main.rs b/crates/oxide_cli/src/main.rs
index 1223a3e5..82400f68 100644
--- a/crates/oxide_cli/src/main.rs
+++ b/crates/oxide_cli/src/main.rs
@@ -2,7 +2,7 @@
 #![allow(dead_code)]
 
 use std::fs;
-use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+use std::net::{IpAddr, SocketAddr};
 use std::process::ExitCode;
 use std::time::{Duration, Instant};
 
@@ -129,6 +129,9 @@ enum ServerCommands {
         /// well-known 端口。
         #[arg(long)]
         port: Option<u16>,
+        /// TCP 绑定地址；缺省 loopback（127.0.0.1），两臂（--rm 与持久）共享。
+        #[arg(long, default_value = "127.0.0.1")]
+        host: IpAddr,
         /// 前台形态：当前进程直接运行持久 server（守护形态 spawn 的子进程用，
         /// 不向用户暴露）。
         #[arg(long, hide = true)]
@@ -331,6 +334,7 @@ fn server_command(command: ServerCommands) -> ExitCode {
             idle_timeout,
             workers,
             port,
+            host,
             foreground,
         } => {
             if rm {
@@ -341,17 +345,18 @@ fn server_command(command: ServerCommands) -> ExitCode {
                 if let Some(n) = workers {
                     config.worker_count = n as usize;
                 }
-                // 显式端口映射 TCP 端点（回环地址硬编码）：0 为动态端口，
+                // 显式端口映射 TCP 端点（绑定地址取 --host）：0 为动态端口，
                 // 由操作系统在绑定后分配空闲端口；不带端口旗标时保持 Unix
                 // 缺省。
                 if let Some(port) = port {
-                    config.endpoint = Endpoint::Tcp(SocketAddr::new(IpAddr::V4(Ipv4Addr::LOCALHOST), port));
+                    config.endpoint = Endpoint::Tcp(SocketAddr::new(host, port));
                 }
                 start_result(run_server_rm(&config))
             } else if foreground {
                 let port = port.unwrap_or(sidecar::WELL_KNOWN_PORT);
                 let mut config = ServerConfig {
-                    endpoint: Endpoint::Tcp(SocketAddr::new(IpAddr::V4(Ipv4Addr::LOCALHOST), port)),
+                    endpoint: Endpoint::Tcp(SocketAddr::new(host, port)),
+                    bind_addr: host,
                     ..ServerConfig::well_known()
                 };
                 if let Some(n) = workers {
@@ -359,7 +364,7 @@ fn server_command(command: ServerCommands) -> ExitCode {
                 }
                 start_result(run_server(&config))
             } else {
-                start_daemon(workers, port.unwrap_or(sidecar::WELL_KNOWN_PORT))
+                start_daemon(workers, host, port.unwrap_or(sidecar::WELL_KNOWN_PORT))
             }
         }
         ServerCommands::Cleanup => match well_known_cleanup() {
@@ -491,7 +496,7 @@ fn control_arm(request: &ServerRequest, render: fn(&ServerResponse) -> Option<St
 }
 
 /// start 持久形态：spawn 脱离的前台 server 子进程（`server start
-/// --foreground`），就绪探测通过后打印返回。
+/// --foreground --host H --port N`），就绪探测通过后打印返回。
 ///
 /// # 步骤
 /// 1. spawn 脱离的前台 server 子进程（标准流全空、不等待）；spawn 失败以
@@ -508,9 +513,9 @@ fn control_arm(request: &ServerRequest, render: fn(&ServerResponse) -> Option<St
 ///
 /// # 副作用
 /// - server 为脱离进程，CLI 退出后由 init 收领继续运行。
-fn start_daemon(workers: Option<u32>, port: u16) -> ExitCode {
+fn start_daemon(workers: Option<u32>, host: IpAddr, port: u16) -> ExitCode {
     // spawn：脱离子进程，标准流全空，不等待。
-    if let Err(err) = spawn::spawn_detached_server(workers, port) {
+    if let Err(err) = spawn::spawn_detached_server(workers, host, port) {
         eprintln!("{}", Red.paint(format!("spawn server 进程失败：{err}")));
         return ExitCode::FAILURE;
     }
@@ -563,8 +568,8 @@ fn restart_command() -> ExitCode {
     }
 
     // 拉起新 server：脱离进程，标准流全空，不等待。新 server 按缺省配置拉起
-    // （well-known 端口，不继承旧旗标）。
-    if let Err(err) = spawn::spawn_detached_server(None, sidecar::WELL_KNOWN_PORT) {
+    // （well-known 绑定地址与端口，不继承旧旗标）。
+    if let Err(err) = spawn::spawn_detached_server(None, sidecar::WELL_KNOWN_BIND_ADDR, sidecar::WELL_KNOWN_PORT) {
         eprintln!("{}", Red.paint(format!("拉起新 server 失败：{err}")));
         return ExitCode::FAILURE;
     }
@@ -855,3 +860,41 @@ fn not_implemented(command: &str) -> ExitCode {
     // 2 = 未实现，与 0=成功、1=运行失败区分，供脚本与 CI 识别。
     ExitCode::from(2)
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::net::{IpAddr, Ipv4Addr};
+
+    /// 取解析结果的 start 臂 host 字段（两臂共享的 --host 旗标）。
+    fn parsed_host(args: &[&str]) -> IpAddr {
+        let cli = Cli::try_parse_from(args).expect("解析应成功");
+        let Some(Commands::Server { command }) = cli.command else {
+            panic!("应解析出 server 臂");
+        };
+        let ServerCommands::Start { host, .. } = command else {
+            panic!("应解析出 start 臂");
+        };
+        host
+    }
+
+    /// --host 缺省取 loopback：不带旗标解析得 127.0.0.1，显式旗标原样解析，
+    /// 非法取值走 clap 错误。
+    #[test]
+    fn start_host_flag_parses() {
+        assert_eq!(
+            parsed_host(&["oxide", "server", "start"]),
+            IpAddr::V4(Ipv4Addr::LOCALHOST),
+            "缺省 host 应为 loopback"
+        );
+        assert_eq!(
+            parsed_host(&["oxide", "server", "start", "--host", "0.0.0.0"]),
+            "0.0.0.0".parse::<IpAddr>().unwrap(),
+            "显式 host 应原样解析"
+        );
+        assert!(
+            Cli::try_parse_from(["oxide", "server", "start", "--host", "not-an-ip"]).is_err(),
+            "非法 host 应走 clap 错误"
+        );
+    }
+}
diff --git a/crates/oxide_cli/src/server/cleanup.rs b/crates/oxide_cli/src/server/cleanup.rs
index 95ed5c2f..efecf6d4 100644
--- a/crates/oxide_cli/src/server/cleanup.rs
+++ b/crates/oxide_cli/src/server/cleanup.rs
@@ -211,7 +211,10 @@ pub fn cleanup_with_wait(sidecar_path: &Path, endpoint: &Endpoint, kill_wait: Du
 /// # 注意事项
 /// - CLI 分派臂与启动 liveness 扫描的稳定入口。
 pub fn well_known_cleanup() -> CleanupOutcome {
-    cleanup(&sidecar::well_known_sidecar_path(), &sidecar::well_known_endpoint())
+    cleanup(
+        &sidecar::well_known_sidecar_path(),
+        &sidecar::well_known_endpoint(sidecar::WELL_KNOWN_BIND_ADDR),
+    )
 }
 
 /// 发送 SIGTERM：`kill -TERM`，与 `pid_alive` 的 `kill -0` 同一 `Command` 路径。
@@ -302,6 +305,7 @@ mod tests {
             version: "0.0.0".into(),
             started_at: 0,
             starttime,
+            port: 0,
         }
     }
 
diff --git a/crates/oxide_cli/src/server/liveness.rs b/crates/oxide_cli/src/server/liveness.rs
index 8a65dfb9..3efc9000 100644
--- a/crates/oxide_cli/src/server/liveness.rs
+++ b/crates/oxide_cli/src/server/liveness.rs
@@ -258,6 +258,7 @@ mod tests {
             version: "0.0.0".into(),
             started_at: 0,
             starttime,
+            port: 0,
         }
     }
 
diff --git a/crates/oxide_cli/src/server/server.rs b/crates/oxide_cli/src/server/server.rs
index e45a6937..065609bd 100644
--- a/crates/oxide_cli/src/server/server.rs
+++ b/crates/oxide_cli/src/server/server.rs
@@ -21,7 +21,7 @@
 
 use std::fs;
 use std::io;
-use std::net::{TcpListener, TcpStream};
+use std::net::{IpAddr, TcpListener, TcpStream};
 use std::os::unix::net::{UnixListener, UnixStream};
 use std::path::{Path, PathBuf};
 use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
@@ -86,17 +86,21 @@ pub struct ServerConfig {
     pub worker_count: usize,
     /// 本进程构建版本，版本比对与 sidecar 写入用；生产默认取构建期版本。
     pub version: String,
+    /// TCP 绑定地址（loopback 缺省）；端点由 CLI 层按本字段加端口构造，
+    /// Unix 臂不受影响。
+    pub bind_addr: IpAddr,
 }
 
 impl ServerConfig {
-    /// 生产默认配置：endpoint 取 well-known TCP 端口，sidecar 取 well-known
-    /// 位置，worker 数取宿主核数，版本取构建期版本。
+    /// 生产默认配置：endpoint 取 well-known TCP 端口（loopback 绑定地址），
+    /// sidecar 取 well-known 位置，worker 数取宿主核数，版本取构建期版本。
     pub fn well_known() -> Self {
         ServerConfig {
-            endpoint: sidecar::well_known_endpoint(),
+            endpoint: sidecar::well_known_endpoint(sidecar::WELL_KNOWN_BIND_ADDR),
             sidecar_path: sidecar::well_known_sidecar_path(),
             worker_count: default_worker_count(),
             version: env!("CARGO_PKG_VERSION").to_string(),
+            bind_addr: sidecar::WELL_KNOWN_BIND_ADDR,
         }
     }
 }
@@ -842,6 +846,7 @@ mod tests {
             sidecar_path: dir.join("sidecar.json"),
             worker_count: 2,
             version: env!("CARGO_PKG_VERSION").to_string(),
+            bind_addr: IpAddr::V4(Ipv4Addr::LOCALHOST),
         }
     }
 
@@ -1419,6 +1424,7 @@ mod tests {
                 .join(format!("oxide_server_tcp_yield_{}_sidecar.json", std::process::id())),
             worker_count: 2,
             version: env!("CARGO_PKG_VERSION").to_string(),
+            bind_addr: IpAddr::V4(Ipv4Addr::LOCALHOST),
         };
         yield_and_takeover(&config).expect("TCP 臂交接应成功");
     }
diff --git a/crates/oxide_cli/src/server/sidecar.rs b/crates/oxide_cli/src/server/sidecar.rs
index 4b6d1db7..910f851c 100644
--- a/crates/oxide_cli/src/server/sidecar.rs
+++ b/crates/oxide_cli/src/server/sidecar.rs
@@ -33,6 +33,8 @@ use serde::{Deserialize, Serialize};
 /// - `started_at`：Unix 秒，人读展示用。
 /// - `starttime`：`/proc/<pid>/stat` 的启动时刻刻度（自开机单调递增），
 ///   PID 复用判定用。
+/// - `port`：TCP 监听端口（机器可读形态），Unix 臂为 0；旧 sidecar 无该
+///   字段时读回为 0（serde 缺省），探活裁决仍走 `socket_path` 文本。
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct ServerIdentity {
     pub pid: u32,
@@ -40,27 +42,37 @@ pub struct ServerIdentity {
     pub version: String,
     pub started_at: u64,
     pub starttime: u64,
+    /// TCP 监听端口（机器可读形态）；Unix 臂为 0。旧 sidecar 无该字段时
+    /// 读回为 0（serde 缺省），探活裁决走 socket_path 文本，行为不变。
+    #[serde(default)]
+    pub port: u16,
 }
 
 impl ServerIdentity {
-    /// 构造当前进程的身份（pid、版本、启动时间、启动时刻刻度）。
+    /// 构造当前进程的身份（pid、版本、启动时间、启动时刻刻度、监听端口）。
     ///
     /// # 边界与前提
     /// - 版本由调用方注入（生产默认取构建期版本，测试注入可区分值），
     ///   本函数不读取构建期版本。
     /// - `socket_path` 字段记监听端点的文本形态（`endpoint.describe()`），
     ///   字段名与 JSON 模式不变，旧 sidecar 可读。
+    /// - `port` 取端点的 TCP 端口（Unix 臂无端口，记 0）。
     /// - 非 Linux 宿主（`/proc` 缺位）时 `starttime` 填 0，交叉核对退化，
     ///   liveness 由 endpoint 探活裁决。
     pub fn new(endpoint: &Endpoint, version: &str) -> Self {
         let pid = std::process::id();
         let started_at = SystemTime::now().duration_since(UNIX_EPOCH).map(|d| d.as_secs()).unwrap_or(0);
+        let port = match endpoint {
+            Endpoint::Tcp(addr) => addr.port(),
+            Endpoint::Unix(_) => 0,
+        };
         ServerIdentity {
             pid,
             socket_path: endpoint.describe(),
             version: version.to_string(),
             started_at,
             starttime: process_starttime(pid).unwrap_or(0),
+            port,
         }
     }
 }
@@ -87,6 +99,9 @@ pub fn current_uid() -> u32 {
 /// well-known TCP 端口：持久 server 缺省端口。
 pub const WELL_KNOWN_PORT: u16 = 4242;
 
+/// well-known TCP 绑定地址：缺省 loopback（持久 server 缺省只接受本机连接）。
+pub const WELL_KNOWN_BIND_ADDR: IpAddr = IpAddr::V4(Ipv4Addr::LOCALHOST);
+
 /// well-known sidecar 路径：`$TMPDIR/oxide-<uid>.json`。
 pub fn well_known_sidecar_path() -> PathBuf {
     std::env::temp_dir().join(format!("oxide-{}.json", current_uid()))
@@ -100,9 +115,9 @@ pub fn well_known_socket_path() -> PathBuf {
     std::env::temp_dir().join(format!("oxide-{}.sock", current_uid()))
 }
 
-/// well-known TCP 端点：127.0.0.1:WELL_KNOWN_PORT（绑定地址固定 loopback）。
-pub fn well_known_endpoint() -> Endpoint {
-    Endpoint::Tcp(SocketAddr::new(IpAddr::V4(Ipv4Addr::LOCALHOST), WELL_KNOWN_PORT))
+/// well-known TCP 端点：bind_addr:WELL_KNOWN_PORT（缺省取 loopback）。
+pub fn well_known_endpoint(bind_addr: IpAddr) -> Endpoint {
+    Endpoint::Tcp(SocketAddr::new(bind_addr, WELL_KNOWN_PORT))
 }
 
 /// 解析端点文本形态：先试 `SocketAddr`（host:port）得 TCP 臂，失败回
@@ -408,6 +423,7 @@ mod tests {
             version: "0.0.0".into(),
             started_at: 0,
             starttime: 0,
+            port: 0,
         }
     }
 
@@ -422,6 +438,42 @@ mod tests {
         assert_eq!(read, id, "五字段应逐字段一致");
     }
 
+    /// 端口字段：TCP 端点记端点端口（机器可读形态），Unix 臂记 0。
+    #[test]
+    fn identity_port_per_arm() {
+        let tcp = ServerIdentity::new(&Endpoint::Tcp(SocketAddr::new(IpAddr::V4(Ipv4Addr::LOCALHOST), 4242)), "0.0.0");
+        assert_eq!(tcp.port, 4242, "TCP 臂应记端点端口");
+        let unix = ServerIdentity::new(&Endpoint::Unix(PathBuf::from("/tmp/oxide-test.sock")), "0.0.0");
+        assert_eq!(unix.port, 0, "Unix 臂应记 0");
+    }
+
+    /// 写读回环（TCP 臂）：sidecar 含机器可读 port 字段，读回逐字段一致。
+    #[test]
+    fn identity_roundtrip_records_tcp_port() {
+        let dir = TestDir::new();
+        let path = dir.path("sidecar.json");
+        let endpoint = Endpoint::Tcp(SocketAddr::new(IpAddr::V4(Ipv4Addr::LOCALHOST), 4242));
+        let id = ServerIdentity::new(&endpoint, "0.0.0");
+        write_exclusive(&id, &path).expect("写 sidecar 应成功");
+        let read = read_identity(&path).expect("读回 sidecar 应成功");
+        assert_eq!(read, id, "字段应逐字段一致");
+        assert_eq!(read.port, 4242, "port 字段应记端点端口");
+    }
+
+    /// 旧 sidecar（无 port 字段）读回：serde 缺省补 0，读回成功不判损坏。
+    #[test]
+    fn legacy_sidecar_without_port_reads_back() {
+        let dir = TestDir::new();
+        let path = dir.path("sidecar.json");
+        fs::write(
+            &path,
+            r#"{"pid":1,"socket_path":"127.0.0.1:4242","version":"0.0.0","started_at":0,"starttime":0}"#,
+        )
+        .expect("写旧 sidecar 应成功");
+        let id = read_identity(&path).expect("旧 sidecar 应可读回");
+        assert_eq!(id.port, 0, "无 port 字段应读回 0");
+    }
+
     /// O_EXCL 排他：同路径二次 create_new 必得 AlreadyExists。
     #[test]
     fn write_exclusive_second_create_fails() {
diff --git a/crates/oxide_cli/src/server/spawn.rs b/crates/oxide_cli/src/server/spawn.rs
index 825b2ecb..fae42d19 100644
--- a/crates/oxide_cli/src/server/spawn.rs
+++ b/crates/oxide_cli/src/server/spawn.rs
@@ -4,31 +4,41 @@
 //! spawn 逻辑。`current_exe()` 在 lib 上下文与二进制目标返回同一路径（lib
 //! 链接进同一个 oxide 二进制），spawn 行为逐字节不变。
 
+use std::net::IpAddr;
 use std::process::{Command, Stdio};
 use std::time::{Duration, Instant};
 
 use super::client::send_control_request;
 use super::protocol::{ServerRequest, ServerResponse};
 
-/// spawn 脱离的前台 server 子进程（`server start --foreground --port N`）：
+/// spawn 脱离的前台 server 子进程（`server start --foreground --host H --port N`）：
 /// 标准流全空，不等待。
 ///
 /// # 步骤
 /// 1. 取当前可执行文件路径。
-/// 2. 构造命令 `server start --foreground --port N` 加可选 `--workers N`。
+/// 2. 构造命令 `server start --foreground --host H --port N` 加可选 `--workers N`。
 /// 3. 三个标准流置空并 spawn。
 ///
 /// # 边界与前提
 /// - 必须带 `--foreground`：守护形态 spawn 的是前台 server 入口，不带该旗标会
 ///   再次进入守护形态形成递归 spawn。
-/// - `port` 是 TCP 监听端口；缺省取 well-known 端口（调用方传入）。
+/// - `host` 是 TCP 绑定地址（调用方传入，缺省 loopback）；`port` 是 TCP 监听
+///   端口，缺省取 well-known 端口（调用方传入）。
 ///
 /// # 副作用
 /// - 创建脱离的子进程，调用方退出后由 init 收领继续运行。
-pub fn spawn_detached_server(workers: Option<u32>, port: u16) -> std::io::Result<std::process::Child> {
+pub fn spawn_detached_server(workers: Option<u32>, host: IpAddr, port: u16) -> std::io::Result<std::process::Child> {
     let exe = std::env::current_exe()?;
     let mut cmd = Command::new(exe);
-    cmd.args(["server", "start", "--foreground", "--port", &port.to_string()]);
+    cmd.args([
+        "server",
+        "start",
+        "--foreground",
+        "--host",
+        &host.to_string(),
+        "--port",
+        &port.to_string(),
+    ]);
     if let Some(n) = workers {
         cmd.args(["--workers", &n.to_string()]);
     }
diff --git a/crates/oxide_cli/src/server/watchdog.rs b/crates/oxide_cli/src/server/watchdog.rs
index e9e2c55f..c3c55dcb 100644
--- a/crates/oxide_cli/src/server/watchdog.rs
+++ b/crates/oxide_cli/src/server/watchdog.rs
@@ -159,8 +159,8 @@ pub fn run_watchdog(workers: Option<u32>) -> ExitCode {
     }
 
     // 初始 spawn 与就绪探测：失败即退 1，不进入监控循环。watchdog 子进程用
-    // well-known 端口（范围控制：不加 --port 旗标）。
-    let mut child = match spawn_detached_server(workers, sidecar::WELL_KNOWN_PORT) {
+    // well-known 绑定地址与端口（范围控制：不加 --host / --port 旗标）。
+    let mut child = match spawn_detached_server(workers, sidecar::WELL_KNOWN_BIND_ADDR, sidecar::WELL_KNOWN_PORT) {
         Ok(child) => child,
         Err(err) => {
             eprintln!("spawn server 进程失败：{err}");
@@ -246,7 +246,7 @@ pub fn run_watchdog(workers: Option<u32>) -> ExitCode {
                     return ExitCode::FAILURE;
                 }
                 std::thread::sleep(CRASH_BACKOFF);
-                match spawn_detached_server(workers, sidecar::WELL_KNOWN_PORT) {
+                match spawn_detached_server(workers, sidecar::WELL_KNOWN_BIND_ADDR, sidecar::WELL_KNOWN_PORT) {
                     Ok(new_child) => {
                         child = new_child;
                         child_exited = None;
@@ -308,6 +308,7 @@ mod tests {
             version: "0.0.0".into(),
             started_at: 0,
             starttime: 0,
+            port: 0,
         }
     }
 
diff --git a/crates/oxide_cli/tests/server_cli.rs b/crates/oxide_cli/tests/server_cli.rs
index ed4dd588..be4b7ecd 100644
--- a/crates/oxide_cli/tests/server_cli.rs
+++ b/crates/oxide_cli/tests/server_cli.rs
@@ -142,7 +142,7 @@ fn server_help_lists_subcommands() {
 fn server_log_no_file_exit_1() {
     let _guard = lock_well_known();
     assert!(
-        !sidecar::is_server_alive(&sidecar::well_known_endpoint()),
+        !sidecar::is_server_alive(&sidecar::well_known_endpoint(sidecar::WELL_KNOWN_BIND_ADDR)),
         "存活 server 占用 well-known 路径，测试不抢占"
     );
 
@@ -162,7 +162,7 @@ fn server_log_no_file_exit_1() {
 fn server_control_arms_no_server_exit_1() {
     let _guard = lock_well_known();
     assert!(
-        !sidecar::is_server_alive(&sidecar::well_known_endpoint()),
+        !sidecar::is_server_alive(&sidecar::well_known_endpoint(sidecar::WELL_KNOWN_BIND_ADDR)),
         "存活 server 占用 well-known 路径，测试不抢占"
     );
 
@@ -181,7 +181,7 @@ fn server_control_arms_no_server_exit_1() {
 fn server_forge_no_server_exit_1() {
     let _guard = lock_well_known();
     assert!(
-        !sidecar::is_server_alive(&sidecar::well_known_endpoint()),
+        !sidecar::is_server_alive(&sidecar::well_known_endpoint(sidecar::WELL_KNOWN_BIND_ADDR)),
         "存活 server 占用 well-known 路径，测试不抢占"
     );
 
@@ -196,7 +196,7 @@ fn server_forge_no_server_exit_1() {
 fn server_cleanup_exit_0() {
     let _guard = lock_well_known();
     assert!(
-        !sidecar::is_server_alive(&sidecar::well_known_endpoint()),
+        !sidecar::is_server_alive(&sidecar::well_known_endpoint(sidecar::WELL_KNOWN_BIND_ADDR)),
         "存活 server 占用 well-known 路径，测试不抢占"
     );
 
@@ -216,7 +216,7 @@ fn server_start_e2e() {
 
     // 探活先行：存活 server 占用全局路径时 panic，不抢占。
     assert!(
-        !sidecar::is_server_alive(&sidecar::well_known_endpoint()),
+        !sidecar::is_server_alive(&sidecar::well_known_endpoint(sidecar::WELL_KNOWN_BIND_ADDR)),
         "存活 server 占用 well-known 路径，测试不抢占"
     );
 
@@ -266,7 +266,7 @@ fn server_start_when_running() {
 
     // 探活先行：存活 server 占用全局路径时 panic，不抢占。
     assert!(
-        !sidecar::is_server_alive(&sidecar::well_known_endpoint()),
+        !sidecar::is_server_alive(&sidecar::well_known_endpoint(sidecar::WELL_KNOWN_BIND_ADDR)),
         "存活 server 占用 well-known 路径，测试不抢占"
     );
 
@@ -305,7 +305,7 @@ fn server_restart_e2e() {
 
     // 探活先行：存活 server 占用全局路径时 panic，不抢占。
     assert!(
-        !sidecar::is_server_alive(&sidecar::well_known_endpoint()),
+        !sidecar::is_server_alive(&sidecar::well_known_endpoint(sidecar::WELL_KNOWN_BIND_ADDR)),
         "存活 server 占用 well-known 路径，测试不抢占"
     );
 
@@ -387,7 +387,7 @@ fn server_log_e2e() {
 
     // 探活先行：存活 server 占用全局路径时 panic，不抢占。
     assert!(
-        !sidecar::is_server_alive(&sidecar::well_known_endpoint()),
+        !sidecar::is_server_alive(&sidecar::well_known_endpoint(sidecar::WELL_KNOWN_BIND_ADDR)),
         "存活 server 占用 well-known 路径，测试不抢占"
     );
 
@@ -469,7 +469,7 @@ fn server_forge_e2e() {
 
     // 探活先行：存活 server 占用全局路径时 panic，不抢占。
     assert!(
-        !sidecar::is_server_alive(&sidecar::well_known_endpoint()),
+        !sidecar::is_server_alive(&sidecar::well_known_endpoint(sidecar::WELL_KNOWN_BIND_ADDR)),
         "存活 server 占用 well-known 路径，测试不抢占"
     );
 
@@ -529,7 +529,7 @@ fn server_watchdog_e2e() {
 
     // 探活先行：存活 server 占用全局路径时 panic，不抢占。
     assert!(
-        !sidecar::is_server_alive(&sidecar::well_known_endpoint()),
+        !sidecar::is_server_alive(&sidecar::well_known_endpoint(sidecar::WELL_KNOWN_BIND_ADDR)),
         "存活 server 占用 well-known 路径，测试不抢占"
     );
 
@@ -634,7 +634,7 @@ fn server_watchdog_sigint_stops_server() {
 
     // 探活先行：存活 server 占用全局路径时 panic，不抢占。
     assert!(
-        !sidecar::is_server_alive(&sidecar::well_known_endpoint()),
+        !sidecar::is_server_alive(&sidecar::well_known_endpoint(sidecar::WELL_KNOWN_BIND_ADDR)),
         "存活 server 占用 well-known 路径，测试不抢占"
     );
 
@@ -682,7 +682,7 @@ fn server_start_port_e2e() {
 
     // 探活先行：存活 server 占用全局路径时 panic，不抢占。
     assert!(
-        !sidecar::is_server_alive(&sidecar::well_known_endpoint()),
+        !sidecar::is_server_alive(&sidecar::well_known_endpoint(sidecar::WELL_KNOWN_BIND_ADDR)),
         "存活 server 占用 well-known 路径，测试不抢占"
     );
 
@@ -761,7 +761,7 @@ fn server_start_port_multi_client() {
 
     // 探活先行：存活 server 占用全局路径时 panic，不抢占。
     assert!(
-        !sidecar::is_server_alive(&sidecar::well_known_endpoint()),
+        !sidecar::is_server_alive(&sidecar::well_known_endpoint(sidecar::WELL_KNOWN_BIND_ADDR)),
         "存活 server 占用 well-known 路径，测试不抢占"
     );
 
@@ -824,7 +824,7 @@ fn server_start_port_second_instance_refused() {
 
     // 探活先行：存活 server 占用全局路径时 panic，不抢占。
     assert!(
-        !sidecar::is_server_alive(&sidecar::well_known_endpoint()),
+        !sidecar::is_server_alive(&sidecar::well_known_endpoint(sidecar::WELL_KNOWN_BIND_ADDR)),
         "存活 server 占用 well-known 路径，测试不抢占"
     );
 
diff --git a/crates/oxide_cli/tests/server_client.rs b/crates/oxide_cli/tests/server_client.rs
index c5843c0f..02a1f4b8 100644
--- a/crates/oxide_cli/tests/server_client.rs
+++ b/crates/oxide_cli/tests/server_client.rs
@@ -5,6 +5,7 @@
 //! 全局单例。
 
 use std::fs;
+use std::net::{IpAddr, Ipv4Addr};
 use std::time::{Duration, Instant};
 
 use oxide_cli::server::client::send_control_request_from;
@@ -21,6 +22,7 @@ fn test_config(test_name: &str) -> ServerConfig {
         sidecar_path: dir.join("sidecar.json"),
         worker_count: 2,
         version: env!("CARGO_PKG_VERSION").to_string(),
+        bind_addr: IpAddr::V4(Ipv4Addr::LOCALHOST),
     }
 }
 
@@ -117,6 +119,7 @@ fn control_client_tcp_arm_end_to_end() {
         sidecar_path: dir.join("sidecar.json"),
         worker_count: 2,
         version: env!("CARGO_PKG_VERSION").to_string(),
+        bind_addr: IpAddr::V4(Ipv4Addr::LOCALHOST),
     };
 
     // 后台线程起真实 run_server，等 sidecar 出现（TCP 臂无 socket 文件，
diff --git a/crates/oxide_cli/tests/server_signal_int.rs b/crates/oxide_cli/tests/server_signal_int.rs
index c50f3b53..c3bf4951 100644
--- a/crates/oxide_cli/tests/server_signal_int.rs
+++ b/crates/oxide_cli/tests/server_signal_int.rs
@@ -4,6 +4,7 @@
 //! 进程级一次性的，信号投递无歧义，测试确定。SIGTERM 路径见
 //! `server_signal_term.rs`（同型，独立进程）。
 
+use std::net::{IpAddr, Ipv4Addr};
 use std::process::Command;
 use std::thread::JoinHandle;
 use std::time::{Duration, Instant};
@@ -21,6 +22,7 @@ fn unique_paths(test_name: &str) -> ServerConfig {
         sidecar_path: dir.join("sidecar.json"),
         worker_count: 2,
         version: env!("CARGO_PKG_VERSION").to_string(),
+        bind_addr: IpAddr::V4(Ipv4Addr::LOCALHOST),
     }
 }
 
diff --git a/crates/oxide_cli/tests/server_signal_term.rs b/crates/oxide_cli/tests/server_signal_term.rs
index 9be7f2fb..269eac3d 100644
--- a/crates/oxide_cli/tests/server_signal_term.rs
+++ b/crates/oxide_cli/tests/server_signal_term.rs
@@ -4,6 +4,7 @@
 //! 进程级一次性的，信号投递无歧义，测试确定。SIGINT 路径见
 //! `server_signal_int.rs`（同型，独立进程）。
 
+use std::net::{IpAddr, Ipv4Addr};
 use std::process::Command;
 use std::thread::JoinHandle;
 use std::time::{Duration, Instant};
@@ -21,6 +22,7 @@ fn unique_paths(test_name: &str) -> ServerConfig {
         sidecar_path: dir.join("sidecar.json"),
         worker_count: 2,
         version: env!("CARGO_PKG_VERSION").to_string(),
+        bind_addr: IpAddr::V4(Ipv4Addr::LOCALHOST),
     }
 }