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// Other services

Port 652: HELLO_PORT

Port 652 is assigned by IANA to hello-port (HELLO_PORT).

652

How hello-port works

Other services
client:652hello-portresponse client:652hello-portresponse

The client sends a request to port 652 and the hello-port 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 652 dangerous?

We have no specific security note for port 652. 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 652

ServicePortTransportDescriptionReferenceUpdated
hello-port 652 TCP, UDP HELLO_PORT - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 652, and is it reachable?

Linux

sudo ss -ltnup 'sport = :652'      # process listening on 652
sudo lsof -nP -i :652

macOS

sudo lsof -nP -i :652

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 652 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 652
netstat -ano | findstr :652

From another machine

nmap -p 652 -sV <host>
sudo nmap -sU -p 652 <host>
nc -zv <host> 652

Block it in the firewall

sudo ufw deny 652/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 652" -Direction Inbound -LocalPort 652 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 652 used for?

Port 652 is assigned by IANA to hello-port (HELLO_PORT).

Is port 652 TCP or UDP?

Port 652 is registered for TCP and UDP.

Is it safe to open port 652?

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 652 is open?

On Linux run "ss -ltnup 'sport = :652'", on macOS "lsof -nP -i :652", and on Windows "netstat -ano | findstr :652" to see the local process. From another machine, "nmap -p 652 <host>" shows whether it is reachable.

05 Related
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