GitHub - dontbug/whois: List of whois servers for common domains that can be checked on port 43
Using the Diagnostic Port 43 Whois Tool
Contractual Compliance Port 43 WHOIS Access Report
RDAP Andy Newton, Chief Engineer. Background WHOIS (Port 43) – Old, very old – Lot's of problems Under specified, no I18N, insecure, no authentication, - ppt download
Connection refused - connect(2) for "whois.reg.com" port 43 · Issue #591 · weppos/whois · GitHub
Who is WHOIS? | Weberblog.net
Concerns regarding harvesting on port 43 WHOIS
Using Whois - American Registry for Internet Numbers
Using Whois - American Registry for Internet Numbers
Procedure for Accessing the Port 43 Whois Service
Using Whois - American Registry for Internet Numbers
Querying the RIPE Database — RIPE Network Coordination Centre
Using the Diagnostic Port 43 Whois Tool
Who is WHOIS? | Weberblog.net
Using the Diagnostic Port 43 Whois Tool
WhoisCL - WHOIS command line tool
ORG.ZA port 43 WHOIS service interruption - May 3 - Anno Internet