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Port 8873 (dxspider)

IANA assigns port 8873 to dxspider: dxspider linking protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dxspider TCP dxspider linking protocol Dirk Koopman -
dxspider UDP dxspider linking protocol Dirk Koopman -

Registry dates for this port: registered 2005-08.

Check what is listening on port 8873

Linux: is anything listening on TCP 8873?
sudo ss -tlnp 'sport = :8873'
Linux: UDP 8873
sudo ss -ulnp 'sport = :8873'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8873
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8873 '
Windows (Command Prompt)
netstat -ano | findstr :8873
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8873 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8873
From Windows
Test-NetConnection HOST -Port 8873
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8873

Block port 8873 in the firewall

ufw
sudo ufw deny 8873/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8873 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8873 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8873' -Direction Inbound -Protocol TCP -LocalPort 8873 -Action Block
ufw
sudo ufw deny 8873/udp
iptables
sudo iptables -A INPUT -p udp --dport 8873 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8873 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8873' -Direction Inbound -Protocol UDP -LocalPort 8873 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.