Checks live SSL certificate and domain registration expiry. No login, no signup.
Domain & SSL Expiry Checker — Live Registration and Certificate Lookup
Two of the most common causes of an unplanned website outage are an expired SSL certificate and a lapsed domain registration — both entirely avoidable, both usually discovered only after visitors start seeing browser warnings or the site goes dark. This tool performs a live check against the certificate presented by the server and a real-time WHOIS lookup for the domain, then shows you exactly how many days remain on each.
Why both checks matter separately
SSL certificates and domain registrations expire independently and are usually managed in different places — the certificate through your hosting or a certificate authority, the domain through your registrar. A renewed domain does not extend your certificate, and a renewed certificate does not extend your domain. Losing either one causes a full outage: an expired certificate triggers a hard browser warning that blocks most visitors, and an expired domain can be picked up by someone else within days of the registrar's grace period ending.
How the check works
- SSL check: the tool opens a real TLS connection to the domain on port 443 and reads the certificate the server actually presents — the same one your visitors' browsers see — rather than relying on a cached database.
- WHOIS check: the tool queries the domain's authoritative WHOIS server directly for the registration expiry date, registrar, and status codes.
Reading domain status codes
WHOIS results often include an EPP status code. The common ones: clientTransferProhibited is a normal protective lock most registrars set by default. clientHold means the domain has been suspended and will not resolve. redemptionPeriod means the domain has already expired and is in the grace window before release — act immediately if you see this on a domain you own.
A sensible renewal buffer
Do not wait until the final week. Certificate authorities and registrars both send renewal reminders, but those emails are routinely missed or filtered as spam. A practical rule: treat 30 days remaining as your action threshold for SSL, and 60 days for domain registration, since some registrars require the renewal to clear before the deadline rather than simply being initiated by it.
Frequently asked questions
What happens when an SSL certificate expires?
Browsers block access with a prominent security warning and most visitors will not click through. Search engines may also flag the site, and API integrations or webhooks that call the domain over HTTPS will start failing outright.
What happens when a domain expires?
The domain typically enters a grace period, then a redemption period with steep reinstatement fees, and if neither is used it becomes available for anyone to register. Email tied to that domain also stops working the moment it stops resolving.
Why does the WHOIS lookup fail for some domains?
Some country-code registries restrict public WHOIS access, require a separate web-based lookup, or use a non-standard reply format this tool cannot parse. This is a limitation of that specific registry, not an error in the check itself.
Is this domain checker free and accurate?
Yes, it is completely free. The SSL result comes from a live connection to the actual certificate in use. The WHOIS result comes from a real-time query to the domain's authoritative registry, not a cached or estimated figure.
Does checking a domain affect it in any way?
No. Both checks are read-only lookups \u2014 an SSL handshake and a standard WHOIS query \u2014 identical to what happens every time a browser visits the site or every time you run a manual WHOIS command.
Related tools: SLA Uptime Calculator, Email Header Analyzer, and Password Strength Analyzer. For hosting decisions, read our hosting comparison.