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// Other services

Port 8873: dxspider linking protocol

Port 8873 is assigned by IANA to dxspider (dxspider linking protocol).

8873

How dxspider works

Other services
client:8873dxspiderresponse client:8873dxspiderresponse

The client sends a request to port 8873 and the dxspider service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 8873 dangerous?

We have no specific security note for port 8873. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 8873

ServicePortTransportDescriptionReferenceUpdated
dxspider 8873 TCP, UDP dxspider linking protocol - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 8873, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8873'      # process listening on 8873
sudo lsof -nP -i :8873

macOS

sudo lsof -nP -i :8873

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8873 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8873
netstat -ano | findstr :8873

From another machine

nmap -p 8873 -sV <host>
sudo nmap -sU -p 8873 <host>
nc -zv <host> 8873

Block it in the firewall

sudo ufw deny 8873/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8873" -Direction Inbound -LocalPort 8873 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8873 used for?

Port 8873 is assigned by IANA to dxspider (dxspider linking protocol).

Is port 8873 TCP or UDP?

Port 8873 is registered for TCP and UDP.

Is it safe to open port 8873?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 8873 is open?

On Linux run "ss -ltnup 'sport = :8873'", on macOS "lsof -nP -i :8873", and on Windows "netstat -ano | findstr :8873" to see the local process. From another machine, "nmap -p 8873 <host>" shows whether it is reachable.

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