# WHATPORT(3168)

## NAME

port 3168 — poweronnud (Now Up-to-Date Public Server) — Registered to Now Software's Now Up-to-Date calendar server; a dead classic-Mac product.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA registers 3168 as `poweronnud`, "Now Up-to-Date Public Server", from Power On Software's Now Up-to-Date & Contact — a shared calendar and contacts product for classic Mac OS and early Mac OS X. The product and its vendor are long gone and there is no protocol specification in the public record, so the registration is essentially the whole story. Nothing you are likely to run listens here today. If 3168 is open, treat the scanner's `poweronnud` label as noise and fingerprint the service.

## EXPOSURE

**Expose with care.** An open 3168 is an unidentified listener; find out what it actually is before deciding whether it should be reachable.

## CHECK

```sh
nc -vz TARGET 3168
```

## 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/3168/> · JSON: <https://whatport.net/3168.json> · full dataset: <https://whatport.net/ports.json>