WHOIS Information
View a domain's registration, registrar, date and name server details.
Run WHOIS LookupSSL Certificate Checker
Check the actual SSL certificate on port 443 of a domain, including its validity period, issuer and SAN details.
Lookup Result
Look up a domain and the results will appear here.
Data is retrieved directly from official registry, DNS and certificate sources.
Last checked:
Registrar
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Registration Date
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Expiry Date
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Domain Age
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- Domain Name
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- Status
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- Registrar
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- Registrar IANA ID
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- Name Server
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- DNSSEC
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- Last Updated
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- Status Codes
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Look up a domain and the results will appear here.
Show raw WHOIS output
Look up a domain and the results will appear here.
Look up a domain and the results will appear here.
How it works
- Where does the data come from?
- A direct TLS connection is made to port 443 of the domain and the actual certificate served by the server is read. Results are cached for 20 minutes.
- How to use it
- Type a domain (e.g. example.com) and run the lookup; you don't need http://, www or a path. The result appears within seconds and the page URL can be shared.
Frequently Asked Questions
What is an SSL certificate?
An SSL/TLS certificate encrypts the connection to a website and allows a trusted certificate authority to verify the site's identity.
How is the SSL check performed?
Whoisera connects to port 443 of the domain, reads the certificate sent by the server, and checks its validity dates, domain name match and chain of trust.
What does an invalid certificate mean?
Certificates that have expired, do not cover the domain, are self-signed or cannot be linked to a trusted authority are shown as invalid.