CyberHunter
Local dataset, no network
// Other services

Port 508: xvttp

Port 508 is assigned by IANA to xvttp (xvttp).

508

How xvttp works

Other services
client:508xvttpresponse client:508xvttpresponse

The client sends a request to port 508 and the xvttp 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 508 dangerous?

We have no specific security note for port 508. 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 508

ServicePortTransportDescriptionReferenceUpdated
xvttp 508 TCP, UDP xvttp - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 508, and is it reachable?

Linux

sudo ss -ltnup 'sport = :508'      # process listening on 508
sudo lsof -nP -i :508

macOS

sudo lsof -nP -i :508

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 508 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 508
netstat -ano | findstr :508

From another machine

nmap -p 508 -sV <host>
sudo nmap -sU -p 508 <host>
nc -zv <host> 508

Block it in the firewall

sudo ufw deny 508/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 508" -Direction Inbound -LocalPort 508 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 508 used for?

Port 508 is assigned by IANA to xvttp (xvttp).

Is port 508 TCP or UDP?

Port 508 is registered for TCP and UDP.

Is it safe to open port 508?

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 508 is open?

On Linux run "ss -ltnup 'sport = :508'", on macOS "lsof -nP -i :508", and on Windows "netstat -ano | findstr :508" to see the local process. From another machine, "nmap -p 508 <host>" shows whether it is reachable.

05 Related
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