# WHATPORT(1058)

## NAME

port 1058 — AIX NIM (nim) — The service port of IBM AIX's Network Installation Management master — where the nimesis daemon takes client requests.

Protocol: TCP/UDP  
IANA registry

## DESCRIPTION

IANA registers 1058 as `nim`, and on IBM AIX this is the well-known service port of Network Installation Management, the framework that installs and maintains AIX systems over the network. The `nimesis` daemon runs on the NIM master, listens on 1058, accepts a client connection, verifies the originator and acknowledges it; NIM clients report installation status back to the master here. IBM's firewall guidance for NIM lists 1058-1059 alongside bootp (67-68), tftp (69), NFS (2049), portmapper (111) and the rsh family. Seeing it open means you have found an AIX NIM master, which by design can push an operating system onto other machines.

## EXPOSURE

**Do not expose.** A NIM master is an OS-provisioning control plane whose classic trust model is rsh-based host trust; it belongs on a management network, never on a public interface.

## CHECK

```sh
nc -vz TARGET 1058
```

## SEE ALSO

- docs — [IBM Support — Network ports used for NIM communication](https://www.ibm.com/support/pages/network-ports-used-nim-communication) (ibm.com)
- docs — [IBM AIX 7.3 docs — Network Installation Management](https://www.ibm.com/docs/en/aix/7.3.0?topic=nim-using-network-installation-management) (ibm.com)
- iana — [IANA Service Name and Transport Protocol Port Number Registry](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml) (iana.org)

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