# WHATPORT(1600)

## NAME

port 1600 — issd — Registered as "issd" with no attribution and no known implementation.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA assigns 1600 (TCP and UDP) to "issd", one of a handful of registry entries that carry no contact, no description beyond the name, and no reference. No mainstream software binds it. In practice a round number like 1600 is far more likely to be someone's hand-picked application or test port than anything to do with the registration.

## EXPOSURE

**Expose with care.** Treat an open 1600 as a locally chosen port of unknown provenance — the registry name gives you no security properties to reason from.

## CHECK

```sh
nc -vz -w 3 TARGET 1600
```

## SEE ALSO

- iana — [IANA port registry — 1600](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=1600) (iana.org)

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HTML: <https://whatport.net/1600/> · JSON: <https://whatport.net/1600.json> · full dataset: <https://whatport.net/ports.json>