# WHATPORT(7938)

## NAME

port 7938 — NetWorker portmapper (lgtomapper) — NetWorker's own portmapper, sitting next to nsrexecd on a backup client.

Protocol: TCP  
IANA registry

## DESCRIPTION

7938 carries what Nmap calls `lgtomapper`, the Legato/NetWorker portmapper that tells callers which dynamic port each NetWorker service is on — the same job Sun RPC's portmapper does on 111. It is unassigned at IANA and appears almost exclusively alongside 7937 on hosts running the NetWorker client. A scan showing 7937 and 7938 together is a reliable NetWorker fingerprint.

## EXPOSURE

**Do not expose.** A portmapper enumerates the rest of the backup stack for whoever asks. Keep it inside the backup segment with the client daemon it serves.

## CHECK

```sh
nmap -sV -Pn -p 7937,7938 TARGET
```

## SEE ALSO

- source — [nmap/nmap — nmap-services (7938/tcp lgtomapper, Legato portmapper)](https://github.com/nmap/nmap/blob/master/nmap-services) (github.com)
- iana — [IANA Service Name and Transport Protocol Port Number Registry — 7938](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=7938) (iana.org)

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HTML: <https://whatport.net/7938/> · JSON: <https://whatport.net/7938.json> · full dataset: <https://whatport.net/ports.json>