Port 63
whois++ and whoispp · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | whois++ and whoispp |
Frequently asked questions
What is port 63 used for?
Port 63 is registered with the IANA for whois++ and whoispp (TCP/UDP). Description: whois++ IANA assigned this well-formed service name as a replacement for "whois++".; whois++.
Is port 63 a well-known port?
Yes. Port 63 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.
How do I check whether port 63 is open?
Locally on Linux with ss -tulpn | grep ':63\b', on Windows with netstat -ano | findstr :63. To test a remote host use Test-NetConnection <host> -Port 63 in PowerShell or nc -zv <host> 63 on Linux/macOS.
How do I open port 63 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 63/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=63/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 63" -Direction Inbound -Protocol TCP -LocalPort 63 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | whoispp | whois++ IANA assigned this well-formed service name as a replacement for "whois++". |
| TCP | whois++ | whois++ |
| UDP | whoispp | whois++ IANA assigned this well-formed service name as a replacement for "whois++". |
| UDP | whois++ | whois++ |