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// Other services

Port 3501: iSoft-P2P

Port 3501 is assigned by IANA to isoft-p2p (iSoft-P2P).

3501

How isoft-p2p works

Other services
client:3501isoft-p2presponse client:3501isoft-p2presponse

The client sends a request to port 3501 and the isoft-p2p 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 3501 dangerous?

We have no specific security note for port 3501. 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 3501

ServicePortTransportDescriptionReferenceUpdated
isoft-p2p 3501 TCP, UDP iSoft-P2P - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3501, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3501'      # process listening on 3501
sudo lsof -nP -i :3501

macOS

sudo lsof -nP -i :3501

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3501 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3501
netstat -ano | findstr :3501

From another machine

nmap -p 3501 -sV <host>
sudo nmap -sU -p 3501 <host>
nc -zv <host> 3501

Block it in the firewall

sudo ufw deny 3501/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3501" -Direction Inbound -LocalPort 3501 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3501 used for?

Port 3501 is assigned by IANA to isoft-p2p (iSoft-P2P).

Is port 3501 TCP or UDP?

Port 3501 is registered for TCP and UDP.

Is it safe to open port 3501?

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 3501 is open?

On Linux run "ss -ltnup 'sport = :3501'", on macOS "lsof -nP -i :3501", and on Windows "netstat -ano | findstr :3501" to see the local process. From another machine, "nmap -p 3501 <host>" shows whether it is reachable.

05 Related
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