# WHATPORT(417)

## NAME

port 417 — Onmux — Registered as "Onmux"; the only surviving annotation ties it to ON Technology's Meeting Maker calendar server.

Protocol: TCP  
IANA: onmux

## DESCRIPTION

IANA lists 417 as onmux with no description beyond the name and no protocol document. The one piece of corroborating information is Nmap's service database, which annotates both 417/tcp and 417/udp as "Meeting maker" — ON Technology's cross-platform group calendar server of the same era. That product is long gone and no specification was ever published. Everything else you could say about this port would be invention.

## EXPOSURE

**Expose with care.** No published protocol and no maintained implementation; if something answers here, identify it locally and keep it off public interfaces.

## CHECK

```sh
nc -vz -w 3 TARGET 417
```

## SEE ALSO

- iana — [IANA Service Name and Transport Protocol Port Number Registry — 417](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=417) (iana.org)
- source — [nmap-services — 417/tcp onmux "Meeting maker"](https://github.com/nmap/nmap/blob/master/nmap-services) (github.com)

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HTML: <https://whatport.net/417/> · JSON: <https://whatport.net/417.json> · full dataset: <https://whatport.net/ports.json>