# WHATPORT(3017)

## NAME

port 3017 — event-listener (registered) — Registered to IANA as Event Listener, with no public protocol behind the name.

Protocol: TCP/UDP  
IANA: event-listener

## DESCRIPTION

IANA holds 3017 as event-listener — registered originally as "event_listener" and later given the well-formed name event-listener, so both appear in service tables. There is no reference document, vendor page, or known open implementation, and the port is uncommon in scan data. The generic name attracts confusion: many unrelated applications describe their own callback socket as an event listener without any connection to this assignment.

## EXPOSURE

**Expose with care.** The name says nothing about what is running — identify the process, because an event-callback socket that accepts arbitrary input is worth reviewing before exposure.

## CHECK

```sh
sudo lsof -nP -iTCP:3017 -sTCP:LISTEN
```

## SEE ALSO

- iana — [IANA Service Name and Transport Protocol Port Number Registry — 3017 (event-listener)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=3017) (iana.org)

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HTML: <https://whatport.net/3017/> · JSON: <https://whatport.net/3017.json> · full dataset: <https://whatport.net/ports.json>