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Port 2875 (dxmessagebase2)

IANA assigns port 2875 to dxmessagebase2: DX Message Base Transport Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dxmessagebase2 TCP DX Message Base Transport Protocol G E Ozz Nixon Jr -
dxmessagebase2 UDP DX Message Base Transport Protocol G E Ozz Nixon Jr -

Registry dates for this port: registered 2009-01-13.

Check what is listening on port 2875

Linux: is anything listening on TCP 2875?
sudo ss -tlnp 'sport = :2875'
Linux: UDP 2875
sudo ss -ulnp 'sport = :2875'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2875
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2875 '
Windows (Command Prompt)
netstat -ano | findstr :2875
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2875 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2875
From Windows
Test-NetConnection HOST -Port 2875
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2875

Block port 2875 in the firewall

ufw
sudo ufw deny 2875/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2875 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2875 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2875' -Direction Inbound -Protocol TCP -LocalPort 2875 -Action Block
ufw
sudo ufw deny 2875/udp
iptables
sudo iptables -A INPUT -p udp --dport 2875 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2875 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2875' -Direction Inbound -Protocol UDP -LocalPort 2875 -Action Block

Related ports

2873psrt2874dxmessagebase12876sps-tunnel2877bluelance

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.