What does the domain expiry checker show?
It asks the domain's registry over RDAP, the modern replacement for WHOIS, for the registration record and shows the expiration date, the registrar and the number of days until the domain expires. If you enter a subdomain or a URL, it looks up the registered domain behind it.
Why check when a domain expires?
- A lapsed domain takes the website, email and APIs on it offline at the same time
- Auto-renew fails silently when a payment card expires
- Domains registered years ago often sit in an account nobody checks
- Expired domains can be registered by someone else and used to impersonate you
- Knowing the date lets you renew on your schedule, not in an emergency