CyberHunter
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// Other services

Port 146: ISO-IP0

Port 146 is assigned by IANA to iso-tp0 (ISO-IP0).

146

How iso-tp0 works

Other services
client:146iso-tp0response client:146iso-tp0response

The client sends a request to port 146 and the iso-tp0 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 146 dangerous?

We have no specific security note for port 146. 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 146

ServicePortTransportDescriptionReferenceUpdated
iso-tp0 146 TCP, UDP ISO-IP0 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 146, and is it reachable?

Linux

sudo ss -ltnup 'sport = :146'      # process listening on 146
sudo lsof -nP -i :146

macOS

sudo lsof -nP -i :146

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 146 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 146
netstat -ano | findstr :146

From another machine

nmap -p 146 -sV <host>
sudo nmap -sU -p 146 <host>
nc -zv <host> 146

Block it in the firewall

sudo ufw deny 146/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 146" -Direction Inbound -LocalPort 146 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 146 used for?

Port 146 is assigned by IANA to iso-tp0 (ISO-IP0).

Is port 146 TCP or UDP?

Port 146 is registered for TCP and UDP.

Is it safe to open port 146?

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 146 is open?

On Linux run "ss -ltnup 'sport = :146'", on macOS "lsof -nP -i :146", and on Windows "netstat -ano | findstr :146" to see the local process. From another machine, "nmap -p 146 <host>" shows whether it is reachable.

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