# WHATPORT(1059)

## NAME

port 1059 — AIX NIM registration (nimreg) — The companion registration port for AIX NIM — how a client adds itself to an existing NIM environment.

Protocol: TCP/UDP  
IANA registry

## DESCRIPTION

IANA registers 1059 as `nimreg`, the registration half of IBM AIX's Network Installation Management pair. Where 1058 carries ongoing master/client service traffic, 1059 is used when a client registers itself into an existing NIM environment: the client obtains a socket via `rcmd()` and connects to the master on this port. It travels with 1058 in every NIM firewall list IBM publishes, so in practice the two are open or closed together. Finding 1059 alone is unusual and worth explaining before you accept it.

## EXPOSURE

**Do not expose.** Self-registration into an OS-provisioning system, over rcmd-based trust — management network only.

## CHECK

```sh
nc -vz TARGET 1059
```

## 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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