CyberHunter
Local dataset, no network
// Other services

Port 3640: Netplay Port 1

Port 3640 is assigned by IANA to netplay-port1 (Netplay Port 1).

3640

How netplay-port1 works

Other services
client:3640netplay-port1response client:3640netplay-port1response

The client sends a request to port 3640 and the netplay-port1 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 3640 dangerous?

We have no specific security note for port 3640. 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 3640

ServicePortTransportDescriptionReferenceUpdated
netplay-port1 3640 TCP, UDP Netplay Port 1 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3640, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3640'      # process listening on 3640
sudo lsof -nP -i :3640

macOS

sudo lsof -nP -i :3640

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3640 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3640
netstat -ano | findstr :3640

From another machine

nmap -p 3640 -sV <host>
sudo nmap -sU -p 3640 <host>
nc -zv <host> 3640

Block it in the firewall

sudo ufw deny 3640/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3640" -Direction Inbound -LocalPort 3640 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3640 used for?

Port 3640 is assigned by IANA to netplay-port1 (Netplay Port 1).

Is port 3640 TCP or UDP?

Port 3640 is registered for TCP and UDP.

Is it safe to open port 3640?

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 3640 is open?

On Linux run "ss -ltnup 'sport = :3640'", on macOS "lsof -nP -i :3640", and on Windows "netstat -ano | findstr :3640" to see the local process. From another machine, "nmap -p 3640 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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