diff --git a/db/knex_migrations/2026-02-07-0000-disable-domain-expiry-unsupported-tlds.js b/db/knex_migrations/2026-02-07-0000-disable-domain-expiry-unsupported-tlds.js
new file mode 100644
index 000000000..9685d46cc
--- /dev/null
+++ b/db/knex_migrations/2026-02-07-0000-disable-domain-expiry-unsupported-tlds.js
@@ -0,0 +1,85 @@
+const { parse: parseTld } = require("tldts");
+const rdapDnsData = require("../../server/model/rdap-dns.json");
+
+const TYPES_WITH_DOMAIN_EXPIRY_SUPPORT_VIA_FIELD = {
+    http: "url",
+    keyword: "url",
+    "json-query": "url",
+    "real-browser": "url",
+    "websocket-upgrade": "url",
+    port: "hostname",
+    ping: "hostname",
+    "grpc-keyword": "grpc_url",
+    dns: "hostname",
+    smtp: "hostname",
+    snmp: "hostname",
+    gamedig: "hostname",
+    steam: "hostname",
+    mqtt: "hostname",
+    radius: "hostname",
+    "tailscale-ping": "hostname",
+    "sip-options": "hostname",
+};
+
+/**
+ * Build set of root TLDs that have RDAP support
+ * @returns {Set<string>} Set of supported root TLDs
+ */
+function getSupportedTlds() {
+    const supported = new Set();
+    const services = rdapDnsData["services"] ?? [];
+    for (const [tlds] of services) {
+        for (const tld of tlds) {
+            supported.add(tld);
+        }
+    }
+    return supported;
+}
+
+/**
+ * Check if a target URL/hostname has RDAP support
+ * @param {string} target URL or hostname
+ * @param {Set<string>} supportedTlds Set of supported root TLDs
+ * @returns {boolean} Whether the target's TLD has RDAP support
+ */
+function hasRdapSupport(target, supportedTlds) {
+    if (!target || typeof target !== "string") {
+        return false;
+    }
+    const tld = parseTld(target);
+    if (!tld.publicSuffix || !tld.isIcann) {
+        return false;
+    }
+    const rootTld = tld.publicSuffix.split(".").pop();
+    return supportedTlds.has(rootTld);
+}
+
+exports.up = async function (knex) {
+    const supportedTlds = getSupportedTlds();
+
+    const monitors = await knex("monitor")
+        .where("domain_expiry_notification", 1)
+        .select("id", "type", "url", "hostname", "grpc_url");
+
+    const idsToDisable = [];
+    for (const monitor of monitors) {
+        const targetField = TYPES_WITH_DOMAIN_EXPIRY_SUPPORT_VIA_FIELD[monitor.type];
+        if (!targetField || !hasRdapSupport(monitor[targetField], supportedTlds)) {
+            idsToDisable.push(monitor.id);
+        }
+    }
+
+    if (idsToDisable.length > 0) {
+        await knex("monitor").whereIn("id", idsToDisable).update("domain_expiry_notification", 0);
+    }
+
+    await knex.schema.alterTable("monitor", function (table) {
+        table.boolean("domain_expiry_notification").defaultTo(0).alter();
+    });
+};
+
+exports.down = async function (knex) {
+    await knex.schema.alterTable("monitor", function (table) {
+        table.boolean("domain_expiry_notification").defaultTo(1).alter();
+    });
+};
diff --git a/src/pages/EditMonitor.vue b/src/pages/EditMonitor.vue
index 9fd33720d..9c2f76ec5 100644
--- a/src/pages/EditMonitor.vue
+++ b/src/pages/EditMonitor.vue
@@ -2761,7 +2761,7 @@ const monitorDefaults = {
     ignoreTls: false,
     upsideDown: false,
     expiryNotification: false,
-    domainExpiryNotification: true,
+    domainExpiryNotification: false,
     maxredirects: 10,
     accepted_statuscodes: ["200-299"],
     saveResponse: false,
@@ -3199,7 +3199,11 @@ message HealthCheckResponse {
 
             this.checkMonitorDebounce = setTimeout(() => {
                 this.$root.getSocket().emit("checkMointor", data, (res) => {
+                    const wasSupported = this.hasDomain;
                     this.hasDomain = !!res?.ok;
+                    if (this.hasDomain !== wasSupported) {
+                        this.monitor.domainExpiryNotification = this.hasDomain;
+                    }
                     this.domainExpiryUnsupportedReason = res.msgi18n ? this.$t(res.msg, res.meta) : res.msg;
                 });
             }, 500);
diff --git a/test/e2e/specs/domain-expiry-notification.spec.js b/test/e2e/specs/domain-expiry-notification.spec.js
new file mode 100644
index 000000000..9ac15ec21
--- /dev/null
+++ b/test/e2e/specs/domain-expiry-notification.spec.js
@@ -0,0 +1,105 @@
+import { expect, test } from "@playwright/test";
+import { login, restoreSqliteSnapshot, screenshot } from "../util-test";
+
+test.describe("Domain Expiry Notification", () => {
+    test.beforeEach(async ({ page }) => {
+        await restoreSqliteSnapshot(page);
+    });
+
+    test("supported TLD auto-enables checkbox", async ({ page }, testInfo) => {
+        await page.goto("./add");
+        await login(page);
+
+        const monitorTypeSelect = page.getByTestId("monitor-type-select");
+        await monitorTypeSelect.selectOption("http");
+
+        await page.getByTestId("url-input").fill("https://example.com");
+
+        const checkbox = page.getByLabel("Domain Name Expiry Notification");
+        await expect(checkbox).toBeChecked();
+        await expect(checkbox).toBeEnabled();
+
+        await screenshot(testInfo, page);
+    });
+
+    test("unsupported TLD leaves checkbox disabled", async ({ page }, testInfo) => {
+        await page.goto("./add");
+        await login(page);
+
+        const monitorTypeSelect = page.getByTestId("monitor-type-select");
+        await monitorTypeSelect.selectOption("http");
+
+        await page.getByTestId("url-input").fill("https://example.co");
+
+        const checkbox = page.getByLabel("Domain Name Expiry Notification");
+        await expect(checkbox).not.toBeChecked();
+        await expect(checkbox).toBeDisabled();
+
+        await screenshot(testInfo, page);
+    });
+
+    test("switching from supported to unsupported TLD disables checkbox", async ({ page }, testInfo) => {
+        await page.goto("./add");
+        await login(page);
+
+        const monitorTypeSelect = page.getByTestId("monitor-type-select");
+        await monitorTypeSelect.selectOption("http");
+
+        const urlInput = page.getByTestId("url-input");
+        const checkbox = page.getByLabel("Domain Name Expiry Notification");
+
+        await urlInput.fill("https://example.com");
+        await expect(checkbox).toBeChecked();
+
+        await urlInput.fill("https://example.co");
+        await expect(checkbox).not.toBeChecked();
+        await expect(checkbox).toBeDisabled();
+
+        await screenshot(testInfo, page);
+    });
+
+    test("switching from unsupported to supported TLD enables checkbox", async ({ page }, testInfo) => {
+        await page.goto("./add");
+        await login(page);
+
+        const monitorTypeSelect = page.getByTestId("monitor-type-select");
+        await monitorTypeSelect.selectOption("http");
+
+        const urlInput = page.getByTestId("url-input");
+        const checkbox = page.getByLabel("Domain Name Expiry Notification");
+
+        await urlInput.fill("https://example.co");
+        await expect(checkbox).not.toBeChecked();
+
+        await urlInput.fill("https://example.com");
+        await expect(checkbox).toBeChecked();
+        await expect(checkbox).toBeEnabled();
+
+        await screenshot(testInfo, page);
+    });
+
+    test("manual uncheck preserved when URL changes within same TLD", async ({ page }, testInfo) => {
+        await page.goto("./add");
+        await login(page);
+
+        const monitorTypeSelect = page.getByTestId("monitor-type-select");
+        await monitorTypeSelect.selectOption("http");
+
+        const urlInput = page.getByTestId("url-input");
+        const checkbox = page.getByLabel("Domain Name Expiry Notification");
+
+        await urlInput.fill("https://example.com");
+        await expect(checkbox).toBeChecked();
+
+        await checkbox.uncheck();
+        await expect(checkbox).not.toBeChecked();
+
+        await urlInput.fill("https://example.com/different-path");
+        // Wait for debounce to fire and verify checkbox stays unchecked
+        await page.waitForTimeout(600);
+        await expect(checkbox).not.toBeChecked();
+        await expect(checkbox).toBeEnabled();
+
+        await screenshot(testInfo, page);
+    });
+});