CyberHunter
Local dataset, no network
// Other services

Port 136: PROFILE Naming System

Port 136 is assigned by IANA to profile (PROFILE Naming System).

136

How profile works

Other services
client:136profileresponse client:136profileresponse

The client sends a request to port 136 and the profile 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 136 dangerous?

We have no specific security note for port 136. 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 136

ServicePortTransportDescriptionReferenceUpdated
profile 136 TCP, UDP PROFILE Naming System - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 136, and is it reachable?

Linux

sudo ss -ltnup 'sport = :136'      # process listening on 136
sudo lsof -nP -i :136

macOS

sudo lsof -nP -i :136

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 136 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 136
netstat -ano | findstr :136

From another machine

nmap -p 136 -sV <host>
sudo nmap -sU -p 136 <host>
nc -zv <host> 136

Block it in the firewall

sudo ufw deny 136/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 136" -Direction Inbound -LocalPort 136 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 136 used for?

Port 136 is assigned by IANA to profile (PROFILE Naming System).

Is port 136 TCP or UDP?

Port 136 is registered for TCP and UDP.

Is it safe to open port 136?

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 136 is open?

On Linux run "ss -ltnup 'sport = :136'", on macOS "lsof -nP -i :136", and on Windows "netstat -ano | findstr :136" to see the local process. From another machine, "nmap -p 136 <host>" shows whether it is reachable.

05 Related
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