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Port 4882 (socp-c)

IANA assigns port 4882 to socp-c: SOCP Control Protocol.

Registered (user) port, 1024-49151 UDP

Port 4882 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

IANA assignment

Service nameProtoDescriptionAssigneeReference
socp-c UDP SOCP Control Protocol Joe Haver -

Registry dates for this port: registered 2010-05-28.

Check what is listening on port 4882

Linux: UDP 4882
sudo ss -ulnp 'sport = :4882'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4882
Windows (Command Prompt)
netstat -ano | findstr :4882
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 4882

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4882

Block port 4882 in the firewall

ufw
sudo ufw deny 4882/udp
iptables
sudo iptables -A INPUT -p udp --dport 4882 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4882 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4882' -Direction Inbound -Protocol UDP -LocalPort 4882 -Action Block

Related ports

4880hislip4881socp-t4883wmlserver4884hivestor

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