# WHATPORT(3737)

## NAME

port 3737 — xpanel (XPanel Daemon) — Registered in 2009 for the XPanel daemon; the UDP side is reserved and the TCP side is almost never seen.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA assigned TCP 3737 to xpanel, the "XPanel Daemon", registered by Lilian Rudenco in March 2009, and marked UDP 3737 Reserved. No public protocol specification accompanies the registration and no widely used implementation is associated with it. That is the whole honest picture: a name in the registry, and a port that scanners rarely find open.

## EXPOSURE

**Expose with care.** With no documented protocol there is nothing to assess — identify the listening process and judge that instead.

## CHECK

```sh
nmap -Pn -sV -p 3737 TARGET
```

## SEE ALSO

- iana — [IANA port registry — 3737 (xpanel)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=3737) (iana.org)

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HTML: <https://whatport.net/3737/> · JSON: <https://whatport.net/3737.json> · full dataset: <https://whatport.net/ports.json>