diff --git a/packages/ui-settings/src/defaults/ss58.spec.ts b/packages/ui-settings/src/defaults/ss58.spec.ts
new file mode 100644
index 00000000..d20ef9a8
--- /dev/null
+++ b/packages/ui-settings/src/defaults/ss58.spec.ts
@@ -0,0 +1,26 @@
+// Copyright 2017-2026 @pezkuwi/ui-settings authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+/// <reference types="@pezkuwi/dev-test/globals.d.ts" />
+
+import { PREFIXES, prefixOptions } from './ss58.js';
+
+describe('ss58 prefix options', (): void => {
+  it('gives each prefix one option, naming every network that uses it', (): void => {
+    expect(prefixOptions([
+      { displayName: 'Pezkuwi Relay Chain', network: 'pezkuwi', prefix: 42 },
+      { displayName: 'Zagros Relay Chain', network: 'zagros', prefix: 42 },
+      { displayName: 'Other', network: 'other', prefix: 7 },
+      { displayName: 'Bizinikiwi', network: 'bizinikiwi', prefix: 42 }
+    ])).toEqual([
+      { info: 'pezkuwi', text: 'Pezkuwi Relay Chain / Zagros Relay Chain / Bizinikiwi', value: 42 },
+      { info: 'other', text: 'Other', value: 7 }
+    ]);
+  });
+
+  it('has no two options with the same value', (): void => {
+    const values = PREFIXES.map(({ value }) => value);
+
+    expect(new Set(values).size).toEqual(values.length);
+  });
+});
diff --git a/packages/ui-settings/src/defaults/ss58.ts b/packages/ui-settings/src/defaults/ss58.ts
index 8c03fb8d..0ee868af 100644
--- a/packages/ui-settings/src/defaults/ss58.ts
+++ b/packages/ui-settings/src/defaults/ss58.ts
@@ -1,6 +1,7 @@
-// Copyright 2017-2025 @pezkuwi/ui-settings authors & contributors
+// Copyright 2017-2026 @pezkuwi/ui-settings authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
+import type { Network } from '@pezkuwi/networks/types';
 import type { Option } from '../types.js';
 
 import { availableNetworks } from '@pezkuwi/networks';
@@ -13,10 +14,26 @@ const defaultNetwork: Option = {
   value: -1
 };
 
-const networks = availableNetworks.map(({ displayName, network, prefix }) => ({
-  info: network,
-  text: displayName,
-  value: prefix
-}));
+/**
+ * One option per address format. The value of an option is the ss58 prefix,
+ * so networks that share a prefix (Pezkuwi, Zagros and Bizinikiwi all use 42)
+ * are the same choice; they are listed together in its text instead of
+ * appearing as separate options with the same value.
+ */
+export function prefixOptions (networks: Pick<Network, 'displayName' | 'network' | 'prefix'>[]): Option[] {
+  const byPrefix = new Map<number, Option>();
 
-export const PREFIXES: Option[] = [defaultNetwork, ...networks];
+  for (const { displayName, network, prefix } of networks) {
+    const existing = byPrefix.get(prefix);
+
+    if (existing) {
+      existing.text = `${existing.text} / ${displayName}`;
+    } else {
+      byPrefix.set(prefix, { info: network, text: displayName, value: prefix });
+    }
+  }
+
+  return [...byPrefix.values()];
+}
+
+export const PREFIXES: Option[] = [defaultNetwork, ...prefixOptions(availableNetworks)];
diff --git a/packages/ui-settings/tsconfig.build.json b/packages/ui-settings/tsconfig.build.json
index da24d9f2..e69f4d94 100644
--- a/packages/ui-settings/tsconfig.build.json
+++ b/packages/ui-settings/tsconfig.build.json
@@ -5,5 +5,8 @@
     "outDir": "./build",
     "rootDir": "./src"
   },
+  "exclude": [
+    "**/*.spec.ts"
+  ],
   "references": []
 }
diff --git a/packages/ui-settings/tsconfig.spec.json b/packages/ui-settings/tsconfig.spec.json
new file mode 100644
index 00000000..90a1806a
--- /dev/null
+++ b/packages/ui-settings/tsconfig.spec.json
@@ -0,0 +1,16 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "baseUrl": "..",
+    "outDir": "./build",
+    "rootDir": "./src",
+    "emitDeclarationOnly": false,
+    "noEmit": true
+  },
+  "include": [
+    "**/*.spec.ts"
+  ],
+  "references": [
+    { "path": "../ui-settings/tsconfig.build.json" }
+  ]
+}
diff --git a/tsconfig.build.json b/tsconfig.build.json
index e4129236..2fdfb34f 100644
--- a/tsconfig.build.json
+++ b/tsconfig.build.json
@@ -11,6 +11,7 @@
     { "path": "./packages/ui-keyring/tsconfig.build.json" },
     { "path": "./packages/ui-keyring/tsconfig.spec.json" },
     { "path": "./packages/ui-settings/tsconfig.build.json" },
+    { "path": "./packages/ui-settings/tsconfig.spec.json" },
     { "path": "./packages/ui-shared/tsconfig.build.json" },
     { "path": "./packages/ui-shared/tsconfig.spec.json" },
     { "path": "./packages/vue-identicon/tsconfig.build.json" }