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Port 2472 (c3)

IANA assigns port 2472 to c3: C3.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
c3 TCP C3 Eckhard Grieger -
c3 UDP C3 Eckhard Grieger -

Check what is listening on port 2472

Linux: is anything listening on TCP 2472?
sudo ss -tlnp 'sport = :2472'
Linux: UDP 2472
sudo ss -ulnp 'sport = :2472'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2472
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2472 '
Windows (Command Prompt)
netstat -ano | findstr :2472
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2472 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2472
From Windows
Test-NetConnection HOST -Port 2472
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2472

Block port 2472 in the firewall

ufw
sudo ufw deny 2472/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2472 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2472 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2472' -Direction Inbound -Protocol TCP -LocalPort 2472 -Action Block
ufw
sudo ufw deny 2472/udp
iptables
sudo iptables -A INPUT -p udp --dport 2472 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2472 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2472' -Direction Inbound -Protocol UDP -LocalPort 2472 -Action Block

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