# WHATPORT(6100)

## NAME

port 6100 — SynchroNet-db — Registered to SynchroNet-db; rarely seen in the wild.

Protocol: TCP/UDP  
IANA registry

## DESCRIPTION

IANA lists 6100 TCP and UDP as synchronet-db, "SynchroNet-db", registered to Arne Haugland, and the same entry is copied into the /etc/services file on most Unix systems. There is no public protocol specification and no widely deployed open-source implementation, so a scanner labelling 6100 as "SynchroNet-db" is reading the registry, not fingerprinting the service. If you find it listening, identify the process on the host rather than trusting the name — this is a plausible port for an in-house or vendor application to squat on.

## EXPOSURE

**Expose with care.** You cannot make a defensible call on a port whose actual occupant is unidentified; find the process, then decide. Treat an unknown listener on a public interface as something to close until it is explained.

## CHECK

```sh
sudo lsof -nP -iTCP:6100 -sTCP:LISTEN
```

## SEE ALSO

- iana — [IANA Service Name and Transport Protocol Port Number Registry — 6100 (synchronet-db)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=6100) (iana.org)

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HTML: <https://whatport.net/6100/> · JSON: <https://whatport.net/6100.json> · full dataset: <https://whatport.net/ports.json>