# WHATPORT(3889)

## NAME

port 3889 — D and V Tester control port (registered) — An IANA registration for a test-equipment control port, with no public documentation.

Protocol: TCP  
IANA: dandv-tester

## DESCRIPTION

IANA registers 3889 as dandv-tester, "D and V Tester Control Port", to a private assignee. It is the control channel for a piece of vendor test equipment; no protocol specification or product documentation is publicly available under that name. The registration is all there is to report. If 3889 is open on something you own, identify it from the listening process, not the registry.

## EXPOSURE

**Do not expose.** A control port for instrumentation, with no documented authentication — an interface that drives hardware should not be internet-reachable.

## CHECK

```sh
sudo lsof -nP -iTCP:3889 -sTCP:LISTEN
```

## SEE ALSO

- iana — [IANA port registry — 3889 (dandv-tester)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=3889) (iana.org)

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