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Port 5133 (nbt-pc)

IANA assigns port 5133 to nbt-pc: Policy Commander.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nbt-pc TCP Policy Commander Emily Harris -
nbt-pc UDP Policy Commander Emily Harris -

Registry dates for this port: registered 2004-11.

Check what is listening on port 5133

Linux: is anything listening on TCP 5133?
sudo ss -tlnp 'sport = :5133'
Linux: UDP 5133
sudo ss -ulnp 'sport = :5133'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5133
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5133 '
Windows (Command Prompt)
netstat -ano | findstr :5133
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5133 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5133
From Windows
Test-NetConnection HOST -Port 5133
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5133

Block port 5133 in the firewall

ufw
sudo ufw deny 5133/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5133 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5133 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5133' -Direction Inbound -Protocol TCP -LocalPort 5133 -Action Block
ufw
sudo ufw deny 5133/udp
iptables
sudo iptables -A INPUT -p udp --dport 5133 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5133 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5133' -Direction Inbound -Protocol UDP -LocalPort 5133 -Action Block

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