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// Other services

Port 595: CAB Protocol

Port 595 is assigned by IANA to cab-protocol (CAB Protocol).

595

How cab-protocol works

Other services
client:595cab-protocolresponse client:595cab-protocolresponse

The client sends a request to port 595 and the cab-protocol 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 595 dangerous?

We have no specific security note for port 595. 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 595

ServicePortTransportDescriptionReferenceUpdated
cab-protocol 595 TCP, UDP CAB Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 595, and is it reachable?

Linux

sudo ss -ltnup 'sport = :595'      # process listening on 595
sudo lsof -nP -i :595

macOS

sudo lsof -nP -i :595

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 595 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 595
netstat -ano | findstr :595

From another machine

nmap -p 595 -sV <host>
sudo nmap -sU -p 595 <host>
nc -zv <host> 595

Block it in the firewall

sudo ufw deny 595/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 595" -Direction Inbound -LocalPort 595 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 595 used for?

Port 595 is assigned by IANA to cab-protocol (CAB Protocol).

Is port 595 TCP or UDP?

Port 595 is registered for TCP and UDP.

Is it safe to open port 595?

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 595 is open?

On Linux run "ss -ltnup 'sport = :595'", on macOS "lsof -nP -i :595", and on Windows "netstat -ano | findstr :595" to see the local process. From another machine, "nmap -p 595 <host>" shows whether it is reachable.

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