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// Other services

Port 565: whoami

Port 565 is assigned by IANA to whoami (whoami).

565

How whoami works

Other services
client:565whoamiresponse client:565whoamiresponse

The client sends a request to port 565 and the whoami 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 565 dangerous?

We have no specific security note for port 565. 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 565

ServicePortTransportDescriptionReferenceUpdated
whoami 565 TCP, UDP whoami - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 565, and is it reachable?

Linux

sudo ss -ltnup 'sport = :565'      # process listening on 565
sudo lsof -nP -i :565

macOS

sudo lsof -nP -i :565

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 565 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 565
netstat -ano | findstr :565

From another machine

nmap -p 565 -sV <host>
sudo nmap -sU -p 565 <host>
nc -zv <host> 565

Block it in the firewall

sudo ufw deny 565/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 565" -Direction Inbound -LocalPort 565 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 565 used for?

Port 565 is assigned by IANA to whoami (whoami).

Is port 565 TCP or UDP?

Port 565 is registered for TCP and UDP.

Is it safe to open port 565?

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 565 is open?

On Linux run "ss -ltnup 'sport = :565'", on macOS "lsof -nP -i :565", and on Windows "netstat -ano | findstr :565" to see the local process. From another machine, "nmap -p 565 <host>" shows whether it is reachable.

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