# WHATPORT(1783)

## NAME

port 1783 — Unassigned (decommissioned) — A rare thing in the port registry — an assignment that was taken back. 1783 is officially nobody's.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA's registry carries no service name for 1783. The entry reads only "Decomissioned Port 04/14/00" (IANA's spelling), meaning the original assignment was withdrawn in April 2000 and never reissued to anyone. There is no protocol to describe. Anything listening here is a locally chosen port, and no scanner's service guess for 1783 is based on a registration.

## EXPOSURE

**Expose with care.** With no assignment at all, the port name tells you nothing — find the listening process on the host and judge that software, not the number.

## CHECK

```sh
nc -vz -w 3 TARGET 1783
```

## SEE ALSO

- iana — [IANA port registry — 1783 (decommissioned, no service name)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=1783) (iana.org)

---

HTML: <https://whatport.net/1783/> · JSON: <https://whatport.net/1783.json> · full dataset: <https://whatport.net/ports.json>