whois flags & options

Basic lookup

Query registration info for a domain.

whois example.com

-h, --host

Specify the WHOIS server to query.

whois -h whois.verisign-grs.com example.com

-p

Connect to a specific port on the WHOIS server.

whois -p 4321 example.com

-H

Hide the legal disclaimer from output.

whois -H example.com

IP address lookup

Look up registration info for an IP address.

whois 8.8.8.8

ASN lookup

Look up an Autonomous System Number.

whois AS15169