# WHATPORT(6689)

## NAME

port 6689 — Tofino Security Appliance — Registered in 2009 for the Tofino industrial security appliance used on SCADA networks.

Protocol: TCP  
IANA registry

## DESCRIPTION

IANA lists 6689/tcp and 6689/udp as tsa, "Tofino Security Appliance", registered in October 2009. Tofino is an industrial firewall dropped inline in front of PLCs and other control-system gear, and the port carries its management and configuration traffic rather than plant process data. You would only see it inside an operational-technology network, next to the device it protects.

## EXPOSURE

**Do not expose.** This is the management plane of a control-system firewall. It belongs on an isolated OT management segment with no path from the internet.

## CHECK

```sh
nc -vz TARGET 6689
```

## SEE ALSO

- iana — [IANA Service Name and Transport Protocol Port Number Registry — 6689 (tsa)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=6689) (iana.org)

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