Port 43

Q: What is port 43?

Domain and IP registration information lookup (WHOIS) Port 43 is used by the WHOIS protocol to query domain name and IP address registration information: registrar, registrant, registration and expiry dates, nameservers. It works via simple plaintext TCP queries to authoritative WHOIS servers. Many WHOIS lookups today use the HTTPS-based RDAP (Registration Data Access Protocol) as a modern replacement, but port 43 remains in active use.

WHOIS

Domain and IP registration information lookup (WHOIS)

Port

Protocol

TCP

Service

WHOIS

Security

Safe

Full name: WHOIS Protocol

What is port 43?

Port 43 is used by the WHOIS protocol to query domain name and IP address registration information: registrar, registrant, registration and expiry dates, nameservers. It works via simple plaintext TCP queries to authoritative WHOIS servers. Many WHOIS lookups today use the HTTPS-based RDAP (Registration Data Access Protocol) as a modern replacement, but port 43 remains in active use.

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