Port 43 · WHOIS

Port 43 is WHOIS, TCP.

WHOIS protocol — queries domain registration and IP allocation data from registries.

Palo Alto

Create the service object for this port, then allow the App-ID on it. Restricting the rule to the port's service object keeps the rule working on a non-default port and stops the App-ID matching on other ports. Replace the placeholders with your own rule name and zones.

set service tcp-43 protocol tcp port 43

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application whois service tcp-43 action allow

Risk and exposure

Rated low risk. Even so, only expose this port to the networks and hosts that need it, and keep it patched.

Check it

• Linux ss -tlnp | grep :43
• PowerShell Test-NetConnection <host> -Port 43
• nmap nmap -p 43 <host>

Related ports

• 53 DNS

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