diff --git a/sql/schema.test.js b/sql/schema.test.js
index c3f8b3c..2d75c4f 100644
--- a/sql/schema.test.js
+++ b/sql/schema.test.js
@@ -178,4 +178,70 @@ describe('sql schema', () => {
     const sql = await fs.readFile(path.join(sqlDir, '12_nt_options.sql'), 'utf8')
     assert.match(sql, /'db_version','2\.41'/)
   })
+
+  it('adds v3 nameserver types without changing existing rows', async () => {
+    const source = await fs.readFile(
+      path.join(sqlDir, 'upgrade', '06_add_nameserver_export_types.sql'),
+      'utf8',
+    )
+    const migration = source.replaceAll(
+      '`nt_nameserver_export_type`',
+      '`test_nameserver_export_type_upgrade`',
+    )
+    const rows = async () =>
+      (
+        await conn.query('SELECT id, name, descr, url FROM test_nameserver_export_type_upgrade ORDER BY id')
+      )[0]
+    const reset = async (extra) => {
+      await conn.query('DELETE FROM test_nameserver_export_type_upgrade')
+      await conn.query(
+        `INSERT INTO test_nameserver_export_type_upgrade (id, name, descr, url)
+         SELECT id, name, descr, url FROM nt_nameserver_export_type WHERE id <= 8`,
+      )
+      for (const row of extra) {
+        await conn.query(
+          'INSERT INTO test_nameserver_export_type_upgrade (id, name, descr, url) VALUES (?, ?, ?, ?)',
+          row,
+        )
+      }
+    }
+
+    await conn.query('DROP TABLE IF EXISTS test_nameserver_export_type_upgrade')
+    await conn.query('CREATE TABLE test_nameserver_export_type_upgrade LIKE nt_nameserver_export_type')
+    try {
+      await reset([
+        [9, 'gerbil', 'Gerbil DNS', ''],
+        [10, 'otter', 'Otter DNS', ''],
+      ])
+      await conn.query(migration)
+
+      const clashingIds = await rows()
+      assert.deepEqual(clashingIds.slice(8, 10), [
+        { id: 9, name: 'gerbil', descr: 'Gerbil DNS', url: '' },
+        { id: 10, name: 'otter', descr: 'Otter DNS', url: '' },
+      ])
+      assert.equal(clashingIds.filter((r) => r.name === 'coredns').length, 1)
+      assert.equal(clashingIds.filter((r) => r.name === 'native').length, 1)
+
+      await conn.query(migration)
+      assert.deepEqual(await rows(), clashingIds, 'repeat migration changed the rows')
+
+      await reset([
+        [11, 'coredns', 'Custom CoreDNS', ''],
+        [12, 'native', 'Custom native', ''],
+      ])
+      await conn.query(migration)
+
+      const existingNames = await rows()
+      assert.deepEqual(
+        existingNames.filter((r) => ['coredns', 'native'].includes(r.name)),
+        [
+          { id: 11, name: 'coredns', descr: 'Custom CoreDNS', url: '' },
+          { id: 12, name: 'native', descr: 'Custom native', url: '' },
+        ],
+      )
+    } finally {
+      await conn.query('DROP TABLE test_nameserver_export_type_upgrade')
+    }
+  })
 })
diff --git a/sql/upgrade/06_add_nameserver_export_types.sql b/sql/upgrade/06_add_nameserver_export_types.sql
new file mode 100644
index 0000000..6f85cf0
--- /dev/null
+++ b/sql/upgrade/06_add_nameserver_export_types.sql
@@ -0,0 +1,18 @@
+# Copyright 2004-2026 The Network People, Inc.
+#
+# Add the nameserver export types introduced in NicTool 3.0 without
+# changing existing ids.
+
+INSERT INTO `nt_nameserver_export_type` (`name`, `descr`, `url`)
+SELECT 'coredns', 'CoreDNS', 'coredns.io'
+FROM DUAL
+WHERE NOT EXISTS (
+    SELECT 1 FROM `nt_nameserver_export_type` WHERE `name` = 'coredns'
+);
+
+INSERT INTO `nt_nameserver_export_type` (`name`, `descr`, `url`)
+SELECT 'native', 'NicTool (in-process)', 'nictool.com'
+FROM DUAL
+WHERE NOT EXISTS (
+    SELECT 1 FROM `nt_nameserver_export_type` WHERE `name` = 'native'
+);