Port 8873DX Spider linking protocol

DX Spider linking protocol used to connect amateur-radio DX cluster nodes.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 5/10
lookups: 0

Technical Details

what runs on :8873

This service carries DX Spider node-to-node link traffic, including DX spot distribution and cluster-network information. The assignment covers both TCP and UDP, although deployed node links are commonly encountered over TCP; the protocol is generally cleartext and intended for configured peer nodes rather than ordinary client sessions. Port 8873 is associated with inter-node links, while port 7300 is commonly used for user Telnet access to a DX Spider node. Exact peer authentication and link framing are implementation and configuration details of the DX Spider deployment.

Security Information

exposure of :8873

risk score

5/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

network services averages 2.6 across 1,689 ports — this one sits 2.4 above.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

A publicly reachable listener can allow probing for a DX Spider node and, if peer authentication or access controls are weak, unauthorized participation in the cluster or injection of misleading spot and routing data. Traffic and credentials should be treated as unencrypted, and access should normally be restricted with firewall rules or VPNs to known peer nodes rather than exposed to the entire Internet.

Record

iana registry entry

port: :8873
service: DX Spider linking protocol
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 5/10caution
category: Network Services
usage: DX Spider is amateur-radio DX cluster software, and port 8873 is used for links between cooperating cluster nodes. Engineers typically encounter it on Internet-connected or privately linked amateur-radio cluster servers; user access is commonly provided through a separate Telnet service, often port 7300.
lookups: 0rank 993
added: 2026-08-30
updated: 2026-09-22
references: IANA service name registry — port 8873

Something wrong?

This record is maintained by the engineers who use port 8873. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-09-22.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :8873DX Spider linking protocol

Technical Details

Security Information

Related Ports

Port 8873DX Spider linking protocol