TCP Port 4321 – rwhois

About TCP Port 4321

The Internet Assigned Numbers Authority (IANA) registers port 4321 for rwhois. The IANA description reads: ‘Remote Who Is’. This port appears in 1 IDS rule and does not have notable malware activity indicators in our data.

IDS Rule References

1 IDS / security rule reference TCP port 4321. Treat that number as context, not a danger score. Many detection rules are written against groups of ports rather than one service, web ports especially, so common web alternate ports inherit large counts while genuinely sensitive services can show few rules or none. Presence in IDS rules does not mean traffic on this port is malicious.

Rule categories (top 1): misc-attack (1).

Sample rule descriptions for TCP port 4321:

• SERVER-OTHER rwhoisd format string attempt

Data Sources

This information is compiled from: IANA Service Name and Transport Protocol Port Number Registry and Snort Community Rules (GPLv2).