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// Other services

Port 6133: New Boundary Tech WOL

Port 6133 is assigned by IANA to nbt-wol (New Boundary Tech WOL).

6133

How nbt-wol works

Other services
client:6133nbt-wolresponse client:6133nbt-wolresponse

The client sends a request to port 6133 and the nbt-wol service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 6133 dangerous?

We have no specific security note for port 6133. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 6133

ServicePortTransportDescriptionReferenceUpdated
nbt-wol 6133 TCP, UDP New Boundary Tech WOL - 2004-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 6133, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6133'      # process listening on 6133
sudo lsof -nP -i :6133

macOS

sudo lsof -nP -i :6133

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6133 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6133
netstat -ano | findstr :6133

From another machine

nmap -p 6133 -sV <host>
sudo nmap -sU -p 6133 <host>
nc -zv <host> 6133

Block it in the firewall

sudo ufw deny 6133/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6133" -Direction Inbound -LocalPort 6133 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6133 used for?

Port 6133 is assigned by IANA to nbt-wol (New Boundary Tech WOL).

Is port 6133 TCP or UDP?

Port 6133 is registered for TCP and UDP.

Is it safe to open port 6133?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 6133 is open?

On Linux run "ss -ltnup 'sport = :6133'", on macOS "lsof -nP -i :6133", and on Windows "netstat -ano | findstr :6133" to see the local process. From another machine, "nmap -p 6133 <host>" shows whether it is reachable.

05 Related
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