# WHATPORT(2045)

## NAME

port 2045 — cdfunc (registration only) — Registered name cdfunc, no description, no assignee, no known software.

Protocol: TCP/UDP  
IANA registry

## DESCRIPTION

TCP and UDP 2045 hold the IANA name cdfunc with every other field blank, and it sits next to sdfunc on 2046 as an obviously paired registration whose meaning was never published. No common implementation binds it; Nmap reports it open on about 0.02% of scanned hosts. This is one of the ports where the honest answer is that the registry entry is the entire body of public knowledge.

## EXPOSURE

**Expose with care.** Unidentified by definition — whatever answers here is not documented, so establish what it is before letting anything reach it.

## CHECK

```sh
sudo lsof -nP -iTCP:2045 -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 — Nmap port frequency data](https://github.com/nmap/nmap/blob/master/nmap-services) (github.com)

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HTML: <https://whatport.net/2045/> · JSON: <https://whatport.net/2045.json> · full dataset: <https://whatport.net/ports.json>