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Port 1712 (registrar)

IANA assigns port 1712 to registrar: resource monitoring service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
registrar TCP resource monitoring service Ron Lawson -
registrar UDP resource monitoring service Ron Lawson -

Check what is listening on port 1712

Linux: is anything listening on TCP 1712?
sudo ss -tlnp 'sport = :1712'
Linux: UDP 1712
sudo ss -ulnp 'sport = :1712'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1712
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1712 '
Windows (Command Prompt)
netstat -ano | findstr :1712
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1712 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1712
From Windows
Test-NetConnection HOST -Port 1712
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1712

Block port 1712 in the firewall

ufw
sudo ufw deny 1712/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1712 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1712 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1712' -Direction Inbound -Protocol TCP -LocalPort 1712 -Action Block
ufw
sudo ufw deny 1712/udp
iptables
sudo iptables -A INPUT -p udp --dport 1712 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1712 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1712' -Direction Inbound -Protocol UDP -LocalPort 1712 -Action Block

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