# WHATPORT(3801)

## NAME

port 3801 — ibm-mgr (IBM manager service) — Registered to IBM in 2006 as a manager service, with no public specification.

Protocol: TCP/UDP  
IANA registry

## DESCRIPTION

IANA lists 3801 as ibm-mgr, "ibm manager service", registered by Tim Hahn of IBM in March 2006. IBM never published a protocol description tied to this port, and it is not one of the ports its current systems-management documentation tells you to open. Scanners find it open only occasionally. The registration is essentially the entire verifiable story.

## EXPOSURE

**Expose with care.** If this really is a management agent, management planes belong on an internal network — confirm what is listening before allowing it through a firewall.

## CHECK

```sh
nmap -Pn -sV -p 3801 TARGET
```

## SEE ALSO

- iana — [IANA port registry — 3801 (ibm-mgr)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=3801) (iana.org)

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HTML: <https://whatport.net/3801/> · JSON: <https://whatport.net/3801.json> · full dataset: <https://whatport.net/ports.json>