# WHATPORT(8873)

## NAME

port 8873 — DXSpider linking protocol — Registered for DXSpider, the amateur-radio DX cluster software, to link one node to another.

Protocol: TCP  
IANA: dxspider

## DESCRIPTION

IANA registers 8873 tcp and udp as dxspider, "dxspider linking protocol". DXSpider (Dirk Koopman, G1TLH) is the DX cluster server that amateur radio operators run to share spots, and cluster nodes interlink over TCP. Seeing it means a ham-radio cluster node, not a general-purpose service; note it is not rsync, which is 873.

## EXPOSURE

**Expose with care.** Cluster nodes are meant to link across the internet, but the protocol is cleartext and node-to-node trust is by configured callsign, so restrict it to the peers you actually link with.

## CHECK

```sh
nc -vz TARGET 8873
```

## SEE ALSO

- docs — [DXSpider — official site and manuals](https://www.dxcluster.org/) (dxcluster.org)
- iana — [IANA Service Name and Transport Protocol Port Number Registry — 8873](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=8873) (iana.org)

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HTML: <https://whatport.net/8873/> · JSON: <https://whatport.net/8873.json> · full dataset: <https://whatport.net/ports.json>