Expiry calendar

How it works

Enter up to 10 domains and MtrXTools builds a calendar feed with an event on each expiry date: the TLS certificate, the domain registration (from RDAP) and the security.txt Expires field. Each event has reminders 14 and 3 days before.

Subscribe once in Google Calendar, Outlook or Apple Calendar. Calendar apps re-fetch the feed about every 12 hours, so renewed certificates move to their new dates on their own.

Why a calendar instead of monitoring

Expired certificates and lapsed domains are almost always renewals that silently failed. A calendar event lands where the team already looks, with no account, agent or dashboard to maintain. Nothing is stored: the domains live in the feed URL.

Questions

Does it need an account?

No. The feed URL contains the domains, so anyone with the link sees the same calendar. Make a new link to change the list.

Why is a domain's registration date missing?

Some registries, including several country-code domains, don't publish expiry dates over RDAP. The certificate date still appears.

What is the security.txt expiry?

security.txt (RFC 9116) tells researchers how to report vulnerabilities and must include an Expires date, after which the file should be treated as stale. The calendar reminds you to update it before that happens.

Can I add the feed to a shared team calendar?

Yes. Subscribe from a shared calendar account, or paste the feed URL into any app that accepts iCalendar (ICS) subscriptions.