# WHATPORT(1104)

## NAME

port 1104 — XRL — Registered to XRL; effectively unused in the wild, so an open 1104 is something else entirely.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA assigns 1104 to a service named xrl for both TCP and UDP, with no public protocol specification behind the registration. Nmap's frequency data records it as open on a vanishingly small fraction of scanned hosts. Treat an open 1104 as an unidentified local application that grabbed a low free port, not as evidence of XRL.

## EXPOSURE

**Expose with care.** Nothing standard listens here, so the first job is identifying the process; do not expose a service you cannot name.

## CHECK

```sh
sudo lsof -nP -iTCP:1104 -sTCP:LISTEN
```

## 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-services (port name and frequency data)](https://github.com/nmap/nmap/blob/master/nmap-services) (github.com)

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HTML: <https://whatport.net/1104/> · JSON: <https://whatport.net/1104.json> · full dataset: <https://whatport.net/ports.json>