CyberHunter
Local dataset, no network
// Other services

Port 663: PureNoise

Port 663 is assigned by IANA to purenoise (PureNoise).

663

How purenoise works

Other services
client:663purenoiseresponse client:663purenoiseresponse

The client sends a request to port 663 and the purenoise 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 663 dangerous?

We have no specific security note for port 663. 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 663

ServicePortTransportDescriptionReferenceUpdated
purenoise 663 TCP, UDP PureNoise - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 663, and is it reachable?

Linux

sudo ss -ltnup 'sport = :663'      # process listening on 663
sudo lsof -nP -i :663

macOS

sudo lsof -nP -i :663

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 663 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 663
netstat -ano | findstr :663

From another machine

nmap -p 663 -sV <host>
sudo nmap -sU -p 663 <host>
nc -zv <host> 663

Block it in the firewall

sudo ufw deny 663/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 663" -Direction Inbound -LocalPort 663 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 663 used for?

Port 663 is assigned by IANA to purenoise (PureNoise).

Is port 663 TCP or UDP?

Port 663 is registered for TCP and UDP.

Is it safe to open port 663?

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 663 is open?

On Linux run "ss -ltnup 'sport = :663'", on macOS "lsof -nP -i :663", and on Windows "netstat -ano | findstr :663" to see the local process. From another machine, "nmap -p 663 <host>" shows whether it is reachable.

05 Related
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