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// Other services

Port 3920: Exasoft IP Port

Port 3920 is assigned by IANA to exasoftport1 (Exasoft IP Port).

3920

How exasoftport1 works

Other services
client:3920exasoftport1response client:3920exasoftport1response

The client sends a request to port 3920 and the exasoftport1 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 3920 dangerous?

We have no specific security note for port 3920. 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 3920

ServicePortTransportDescriptionReferenceUpdated
exasoftport1 3920 TCP, UDP Exasoft IP Port - 2003-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 3920, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3920'      # process listening on 3920
sudo lsof -nP -i :3920

macOS

sudo lsof -nP -i :3920

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3920 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3920
netstat -ano | findstr :3920

From another machine

nmap -p 3920 -sV <host>
sudo nmap -sU -p 3920 <host>
nc -zv <host> 3920

Block it in the firewall

sudo ufw deny 3920/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3920" -Direction Inbound -LocalPort 3920 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3920 used for?

Port 3920 is assigned by IANA to exasoftport1 (Exasoft IP Port).

Is port 3920 TCP or UDP?

Port 3920 is registered for TCP and UDP.

Is it safe to open port 3920?

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 3920 is open?

On Linux run "ss -ltnup 'sport = :3920'", on macOS "lsof -nP -i :3920", and on Windows "netstat -ano | findstr :3920" to see the local process. From another machine, "nmap -p 3920 <host>" shows whether it is reachable.

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