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// Web

Port 3930: Syam Web Server Port

Port 3930 is assigned by IANA to syam-webserver (Syam Web Server Port).

3930

How syam-webserver works

Web
browser:3930syam-webserver browser:3930syam-webserver

A browser sends an HTTP request to port 3930 and the syam-webserver server sends the page back.

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
Web
01 Security

Is port 3930 dangerous?

We have no specific security note for port 3930. Its risk depends on the program actually listening on it. General advice for web services:

  • Serve it over HTTPS only and check the HTTP security headers.
  • Keep admin consoles and development servers off the Internet.
  • Patch the application server and remove default credentials and sample apps.
02 Registry

IANA registry entries for port 3930

ServicePortTransportDescriptionReferenceUpdated
syam-webserver 3930 TCP, UDP Syam Web Server Port - 2003-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 3930, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3930'      # process listening on 3930
sudo lsof -nP -i :3930

macOS

sudo lsof -nP -i :3930

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3930 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3930
netstat -ano | findstr :3930

From another machine

nmap -p 3930 -sV <host>
sudo nmap -sU -p 3930 <host>
nc -zv <host> 3930

Block it in the firewall

sudo ufw deny 3930/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3930" -Direction Inbound -LocalPort 3930 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3930 used for?

Port 3930 is assigned by IANA to syam-webserver (Syam Web Server Port).

Is port 3930 TCP or UDP?

Port 3930 is registered for TCP and UDP.

Is it safe to open port 3930?

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. Serve it over HTTPS only and check the HTTP security headers.

How do I check if port 3930 is open?

On Linux run "ss -ltnup 'sport = :3930'", on macOS "lsof -nP -i :3930", and on Windows "netstat -ano | findstr :3930" to see the local process. From another machine, "nmap -p 3930 <host>" shows whether it is reachable.

05 Related
:443 HTTPS tcp · udp · sctp · low risk :80 HTTP tcp · udp · sctp · moderate risk :8080 HTTP alternate tcp · udp · high risk :8443 HTTPS alternate tcp · udp · moderate risk :3000 Dev servers / Grafana tcp · udp · moderate risk :5000 Flask / Docker registry / UPnP tcp · udp · moderate risk :8000 HTTP alternate (dev) tcp · udp · moderate risk :8888 Jupyter / HTTP alternate tcp · udp · high risk

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