Features

Domain Sentinel checks your domains against the registries every day and tells you when something moves. Here is everything it does, feature by feature, and the plan that includes it.

See the plans and prices

Watching domains

Daily registry checks

Each watched domain is checked once a day, RDAP first, WHOIS when the registry has no RDAP, DNS as a last resort. Hourly checks on request.Free: 3 domains, extensions included. Pro: as many as you need.

Expiry reminders

An email 60, 30, 7 and 1 days before a domain expires, from the registry's own date rather than your calendar.Free and Pro.

Availability alerts

Watch a taken domain and get an email the day it becomes available, with the redemption and pending-delete steps explained along the way.Free and Pro.

Change detection

Registrar, nameservers, statuses, DNSSEC, contacts: every registration change is recorded with before and after, and emailed to you.Free and Pro.

Alert parameters

Choose which changes trigger an alert, per account, per group or per domain, so a routine renewal does not wake you up.Pro.

Extension variants

Watch yourdomain.net, .org, .io and a dozen more next to your domain, and know when a variant is registered or freed.Pro.

DNS monitoring

A nightly snapshot of A, AAAA, MX, TXT, NS and CNAME records for the apex, www and your own hostnames, and a precise diff when one changes.Pro.

TLS certificate monitoring

The certificate of each watched domain is read daily: you hear about it before it expires or when the issuer changes.Pro.

Monitoring groups

File domains in groups with their own alert settings, for a client, a brand or a team.Pro.

Alerts and reports

Email alerts

Every alert arrives as an email that says what changed, with the old and new values side by side and an unsubscribe link per domain.Free and Pro.

Webhooks, Slack and Discord

Send alerts to your own endpoint, signed, or straight to a Slack or Discord channel, filtered by event, group or domain.Pro, up to 10 endpoints.

Weekly report

A weekly email that sums up your portfolio: what changed, what expires soon, what needs a decision, with one-click actions.Free and Pro.

Data and history

Change history

A timeline of every change recorded on a domain, the raw registry answer included.Free: the last 30 days. Pro: the whole timeline.

WHOIS and RDAP lookup

Check any domain without an account: registered or available, expiry, registrar, nameservers, about 1,200 extensions.Free for everyone, with or without an account.

DNS lookup

Read the DNS records of any hostname in one click, _dmarc and friends included.Free for everyone, with or without an account.

CSV import

Paste a list of domains and Domain Sentinel checks them all, then adds them to your watchlist in one go.Free: 20 domains per file. Pro: 200.

Integrations

REST API

One endpoint returns the registry data of a domain as JSON, with an OpenAPI spec to generate your client.Free: 1 key, 500 calls a month. Pro: 5 keys, 10,000 calls.

MCP server

Connect Claude, Cursor or any MCP client to your account and ask about your domains in plain language.Free and Pro, with the limits of the plan.