# WHATPORT(8081)

## NAME

port 8081 — HTTP alternate; Sonatype Nexus Repository — The port you use when 8080 is taken — and Nexus Repository Manager's default.

Protocol: TCP  
IANA: sunproxyadmin

## DESCRIPTION

IANA registers 8081 as sunproxyadmin, Sun's old proxy admin service, and Nmap still labels it `blackice-icecap` after a long-dead IDS console. Neither matters today: 8081 is the standard second HTTP port, and its most recognisable occupant is Sonatype Nexus Repository, whose documentation has you browse to `http://localhost:8081/` after install. Artifact proxies, second app instances and container sidecars fill in the rest.

## EXPOSURE

**Expose with care.** A Nexus instance on 8081 is an admin console plus your build artifacts, and it ships with a well-known default admin account that must be changed at first login. Public artifact mirroring can be deliberate; the console being public rarely is.

## CHECK

```sh
curl -sI http://TARGET:8081/
```

## SEE ALSO

- docs — [Sonatype — Nexus Repository installation (UI on port 8081)](https://help.sonatype.com/en/installation-methods.html) (help.sonatype.com)
- iana — [IANA Service Name and Transport Protocol Port Number Registry — 8081 (sunproxyadmin)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=8081) (iana.org)

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HTML: <https://whatport.net/8081/> · JSON: <https://whatport.net/8081.json> · full dataset: <https://whatport.net/ports.json>