# WHATPORT(2191)

## NAME

port 2191 — TvBus Messaging — Registered as "TvBus Messaging" and essentially undocumented in public.

Protocol: TCP  
IANA: tvbus

## DESCRIPTION

IANA registers 2191 as tvbus, "TvBus Messaging". There is no published specification and no widely deployed product that defaults to it, so unlike its neighbour 2190 it carries no recognisable traffic on modern networks. If you find it open, the registration tells you nothing useful — identify the listening process instead.

## EXPOSURE

**Expose with care.** An unidentified listener is the finding here; the registered name does not establish what is running or whether it authenticates.

## CHECK

```sh
sudo lsof -nP -iTCP:2191 -sTCP:LISTEN
```

## SEE ALSO

- iana — [IANA Service Name and Transport Protocol Port Number Registry — 2191 (tvbus)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=2191) (iana.org)

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HTML: <https://whatport.net/2191/> · JSON: <https://whatport.net/2191.json> · full dataset: <https://whatport.net/ports.json>