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// Other services

Port 147: ISO-IP

Port 147 is assigned by IANA to iso-ip (ISO-IP).

147

How iso-ip works

Other services
client:147iso-ipresponse client:147iso-ipresponse

The client sends a request to port 147 and the iso-ip 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 147 dangerous?

We have no specific security note for port 147. 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 147

ServicePortTransportDescriptionReferenceUpdated
iso-ip 147 TCP, UDP ISO-IP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 147, and is it reachable?

Linux

sudo ss -ltnup 'sport = :147'      # process listening on 147
sudo lsof -nP -i :147

macOS

sudo lsof -nP -i :147

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 147 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 147
netstat -ano | findstr :147

From another machine

nmap -p 147 -sV <host>
sudo nmap -sU -p 147 <host>
nc -zv <host> 147

Block it in the firewall

sudo ufw deny 147/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 147" -Direction Inbound -LocalPort 147 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 147 used for?

Port 147 is assigned by IANA to iso-ip (ISO-IP).

Is port 147 TCP or UDP?

Port 147 is registered for TCP and UDP.

Is it safe to open port 147?

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 147 is open?

On Linux run "ss -ltnup 'sport = :147'", on macOS "lsof -nP -i :147", and on Windows "netstat -ano | findstr :147" to see the local process. From another machine, "nmap -p 147 <host>" shows whether it is reachable.

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