TCP Port 4011 – altserviceboot

About TCP Port 4011

Port 4011 is registered with the Internet Assigned Numbers Authority (IANA) for altserviceboot. The IANA description reads: ‘Alternate Service Boot’. 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 4011. 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): attempted-user (1).

Sample rule descriptions for TCP port 4011:

• ET EXPLOIT Broadcom Altiris IRM Unauthenticated Remote Code Execution (CVE-2025-5333)

Data Sources

This information is compiled from: IANA Service Name and Transport Protocol Port Number Registry and Emerging Threats Open Ruleset (BSD 2-Clause / GPLv2 per SID range).