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// Other services

Port 2520: Pervasive Listener

Port 2520 is assigned by IANA to pvsw (Pervasive Listener).

2520

How pvsw works

Other services
client:2520pvswresponse client:2520pvswresponse

The client sends a request to port 2520 and the pvsw 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
Registered (1024-49151)
Category
Other services
01 Security

Is port 2520 dangerous?

We have no specific security note for port 2520. 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 2520

ServicePortTransportDescriptionReferenceUpdated
pvsw 2520 TCP, UDP Pervasive Listener - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2520, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2520'      # process listening on 2520
sudo lsof -nP -i :2520

macOS

sudo lsof -nP -i :2520

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2520 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2520
netstat -ano | findstr :2520

From another machine

nmap -p 2520 -sV <host>
sudo nmap -sU -p 2520 <host>
nc -zv <host> 2520

Block it in the firewall

sudo ufw deny 2520/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2520" -Direction Inbound -LocalPort 2520 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2520 used for?

Port 2520 is assigned by IANA to pvsw (Pervasive Listener).

Is port 2520 TCP or UDP?

Port 2520 is registered for TCP and UDP.

Is it safe to open port 2520?

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 2520 is open?

On Linux run "ss -ltnup 'sport = :2520'", on macOS "lsof -nP -i :2520", and on Windows "netstat -ano | findstr :2520" to see the local process. From another machine, "nmap -p 2520 <host>" shows whether it is reachable.

05 Related
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