TCP Port 51820

About TCP Port 51820

Port 51820 is not assigned to any service in the IANA Service Names and Port Numbers Registry. This port falls within the dynamic/private port range, which IANA explicitly does not register; these ports are intended for ephemeral or temporary use. It is referenced in 1 IDS rule but does not exhibit malware activity indicators in our data.

IDS Rule References

1 IDS / security rule reference TCP port 51820. Presence in IDS rules does not mean traffic on this port is malicious. These are patterns security tools monitor.

Rule categories (top 1): attempted-admin (1).

Sample rule descriptions for TCP port 51820:

• ET EXPLOIT Possible Apache log4j RCE Attempt – 2021/12/12 Obfuscation Observed M2 (udp) (CVE-2021-44228)

Data Sources

This information is compiled from: Emerging Threats Open Ruleset (BSD 2-Clause / GPLv2 per SID range).