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Port 6133 (nbt-wol)

IANA assigns port 6133 to nbt-wol: New Boundary Tech WOL.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nbt-wol TCP New Boundary Tech WOL Elizabeth Zilen -
nbt-wol UDP New Boundary Tech WOL Elizabeth Zilen -

Registry dates for this port: registered 2004-11.

Check what is listening on port 6133

Linux: is anything listening on TCP 6133?
sudo ss -tlnp 'sport = :6133'
Linux: UDP 6133
sudo ss -ulnp 'sport = :6133'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6133
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6133 '
Windows (Command Prompt)
netstat -ano | findstr :6133
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6133 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6133
From Windows
Test-NetConnection HOST -Port 6133
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6133

Block port 6133 in the firewall

ufw
sudo ufw deny 6133/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6133 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6133 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6133' -Direction Inbound -Protocol TCP -LocalPort 6133 -Action Block
ufw
sudo ufw deny 6133/udp
iptables
sudo iptables -A INPUT -p udp --dport 6133 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6133 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6133' -Direction Inbound -Protocol UDP -LocalPort 6133 -Action Block

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