# WHATPORT(1106)

## NAME

port 1106 — ISOIPSIGPORT-1 — Registered as an ISO IP signalling port; no public spec and essentially never observed.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA lists 1106 as isoipsigport-1, paired with isoipsigport-2 on 1107, for ISO-over-IP signalling. There is no published specification tied to the registration and no widely deployed implementation, and Nmap's dataset almost never finds it open. An open 1106 is best explained by an unrelated program choosing the port.

## EXPOSURE

**Expose with care.** Identify what is actually listening before deciding anything; the registration tells you nothing useful about the risk.

## CHECK

```sh
sudo lsof -nP -iTCP:1106 -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)

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HTML: <https://whatport.net/1106/> · JSON: <https://whatport.net/1106.json> · full dataset: <https://whatport.net/ports.json>