HTTPfy

Port 3972 (iconp)

IANA assigns port 3972 to iconp: ict-control Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
iconp TCP ict-control Protocol Roel Harbers -
iconp UDP ict-control Protocol Roel Harbers -

Registry dates for this port: registered 2005-08.

Check what is listening on port 3972

Linux: is anything listening on TCP 3972?
sudo ss -tlnp 'sport = :3972'
Linux: UDP 3972
sudo ss -ulnp 'sport = :3972'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3972
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3972 '
Windows (Command Prompt)
netstat -ano | findstr :3972
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3972 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3972
From Windows
Test-NetConnection HOST -Port 3972
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3972

Block port 3972 in the firewall

ufw
sudo ufw deny 3972/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3972 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3972 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3972' -Direction Inbound -Protocol TCP -LocalPort 3972 -Action Block
ufw
sudo ufw deny 3972/udp
iptables
sudo iptables -A INPUT -p udp --dport 3972 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3972 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3972' -Direction Inbound -Protocol UDP -LocalPort 3972 -Action Block

Related ports

3970lanrevagent3971lanrevserver3973progistics3974xk22

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