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Port 1612 (netbill-trans)

IANA assigns port 1612 to netbill-trans: NetBill Transaction Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netbill-trans TCP NetBill Transaction Server - -
netbill-trans UDP NetBill Transaction Server - -

Check what is listening on port 1612

Linux: is anything listening on TCP 1612?
sudo ss -tlnp 'sport = :1612'
Linux: UDP 1612
sudo ss -ulnp 'sport = :1612'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1612
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1612 '
Windows (Command Prompt)
netstat -ano | findstr :1612
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1612 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1612
From Windows
Test-NetConnection HOST -Port 1612
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1612

Block port 1612 in the firewall

ufw
sudo ufw deny 1612/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1612 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1612 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1612' -Direction Inbound -Protocol TCP -LocalPort 1612 -Action Block
ufw
sudo ufw deny 1612/udp
iptables
sudo iptables -A INPUT -p udp --dport 1612 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1612 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1612' -Direction Inbound -Protocol UDP -LocalPort 1612 -Action Block

Related ports

1610taurus-wh1611ill1613netbill-keyrep1614netbill-cred

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