Free domain utilities

Look up, convert, and decode without an account.

Use these tools to check public DNS, convert internationalized names, and inspect a certificate request before you order SSL.

WHOIS Domain Lookup Public registration data via RDAP, with WHOIS fallback. IDN Converter Unicode to Punycode and back for international names. CSR decoder Read subject, key type, and SANs from a PEM request. DNS lookup Resolve A, AAAA, MX, NS, TXT, CNAME, and CAA records.

IDN Converter

Convert an internationalized domain name between Unicode and ASCII Punycode. Enter the host only, without https:// or a path.

CSR decoder

Paste a PEM certificate signing request to inspect the subject, public key, signature algorithm, and subject alternative names. Decoding happens in your browser.

DNS lookup

Query public DNS records for a hostname. Results come from public resolvers and may differ from the servers a visitor actually uses.