diff --git a/app/src/daemon.ts b/app/src/daemon.ts
index 25907ae..eb20f6b 100644
--- a/app/src/daemon.ts
+++ b/app/src/daemon.ts
@@ -8,7 +8,13 @@ import { Readable } from "stream";
 
 import { DecodeTransform, EncodeTransform } from "./transforms";
 
-export function init(port: number, serverPassword?: string) {
+interface DaemonOpts {
+    host: string;
+    port: number;
+    password: string;
+}
+
+export function init(opts: DaemonOpts) {
     const server = http.createServer();
     const wss = new WebSocket.Server({ noServer: true });
 
@@ -65,14 +71,14 @@ export function init(port: number, serverPassword?: string) {
      * server password specified in launch options.
      */
     function authenticate(req: IncomingMessage) {
-        if (!serverPassword) return true;
+        if (!opts.password) return true;
 
         const password = new URL(
             req.url!,
             `http://${req.headers.host}`
         ).searchParams.get("password");
 
-        return password === serverPassword;
+        return password === opts.password;
     }
 
     server.on("upgrade", (req, socket, head) => {
@@ -113,5 +119,5 @@ export function init(port: number, serverPassword?: string) {
         res.end();
     });
 
-    server.listen(port);
+    server.listen({ port: opts.port, host: opts.host });
 }
diff --git a/app/src/main.ts b/app/src/main.ts
index 33fab91..1ab3eaa 100644
--- a/app/src/main.ts
+++ b/app/src/main.ts
@@ -6,16 +6,19 @@ import { __applicationVersion } from "../package.json";
 
 const argv = minimist(process.argv.slice(2), {
     boolean: ["daemon", "help", "version"],
-    string: ["__name", "port", "password"],
+    string: ["__name", "host", "port", "password"],
     alias: {
         d: "daemon",
         h: "help",
         v: "version",
-        p: "port"
+        n: "host",
+        p: "port",
+        P: "password"
     },
     default: {
         __name: path.basename(process.argv[0]),
         daemon: false,
+        host: "localhost",
         port: "9556"
     }
 });
@@ -32,15 +35,17 @@ Options:
   -h, --help       Print usage info
   -v, --version    Print version info
   -d, --daemon     Launch in daemon mode. This starts a WebSocket server that
-                   the extension can be configured to connect to under bridge
-                   options.
-  -p, --port       Set port number for WebSocket server. This must match the
-                   port set in the extension options.
-  --password       Set an optional password for the WebSocket server. This must
-                   match the password set in the extension options.
-                   WARNING: This password is intended only as a basic access
-                   control measure and is transmitted in plain text even over
-                   remote connections!
+                     the extension can be configured to connect to under bridge
+                     options.
+  -n, --host       Host for daemon WebSocket server. This must match the host
+                     set in the extension options.
+  -p, --port       Port number for daemon WebSocket server. This must match the
+                     port set in the extension options.
+  -P, --password   Set an optional password for the daemon WebSocket server.
+                     This must match the password set in the extension options.
+                     WARNING: This password is intended only as a basic access
+                     control measure and is transmitted in plain text even over
+                     remote connections!
 `
     );
 } else if (argv.daemon) {
@@ -51,7 +56,11 @@ Options:
     }
 
     import("./daemon").then(daemon => {
-        daemon.init(port, argv.password);
+        daemon.init({
+            host: argv.host,
+            port,
+            password: argv.password
+        });
     });
 } else {
     import("./bridge");
diff --git a/ext/src/lib/nativeMessaging.ts b/ext/src/lib/nativeMessaging.ts
index 4882ad2..f9e7171 100644
--- a/ext/src/lib/nativeMessaging.ts
+++ b/ext/src/lib/nativeMessaging.ts
@@ -15,7 +15,16 @@ async function getBackupServerUrl() {
     const { bridgeBackupHost, bridgeBackupPort, bridgeBackupPassword } =
         await options.getAll();
 
-    const url = new URL(`ws://${bridgeBackupHost}:${bridgeBackupPort}`);
+    const url = new URL(
+        `ws://${
+            // Handle IPv6 address formatting
+            bridgeBackupHost.includes(":")
+                ? `[${bridgeBackupHost}]`
+                : bridgeBackupHost
+        }`
+    );
+    url.port = bridgeBackupPort.toString();
+
     if (bridgeBackupPassword) {
         url.searchParams.append("password", bridgeBackupPassword);
     }