# WHATPORT(20031)

## NAME

port 20031 — Unassigned (NetVault on UDP) — Unassigned on TCP; Nmap names the UDP side as BakBone NetVault's backup communications port.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA has 20031 inside the unassigned range 20015-20033, so there is no TCP registration. Nmap's service table labels 20031/udp 'bakbonenetvault — BakBone NetVault primary communications port', with a comparatively high open-frequency, and NetVault (BakBone, later Quest) is the only widely documented user of this number. On TCP the entry is 'unknown'. If you find it open on a server that also runs backup agents, NetVault is the first thing to check; otherwise treat it as an unidentified listener.

## EXPOSURE

**Do not expose.** A backup control channel reaches every file on every protected host. Whether or not it is NetVault, this stays on a management network.

## CHECK

```sh
nmap -Pn -sV -p 20031 --reason TARGET
```

## SEE ALSO

- 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)
- source — [Nmap nmap-services frequency table](https://github.com/nmap/nmap/blob/master/nmap-services) (github.com)

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HTML: <https://whatport.net/20031/> · JSON: <https://whatport.net/20031.json> · full dataset: <https://whatport.net/ports.json>