HTTPfy

Port 3930 (syam-webserver)

IANA assigns port 3930 to syam-webserver: Syam Web Server Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
syam-webserver TCP Syam Web Server Port Michael Daniele -
syam-webserver UDP Syam Web Server Port Michael Daniele -

Registry dates for this port: registered 2003-11.

Check what is listening on port 3930

Linux: is anything listening on TCP 3930?
sudo ss -tlnp 'sport = :3930'
Linux: UDP 3930
sudo ss -ulnp 'sport = :3930'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3930
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3930 '
Windows (Command Prompt)
netstat -ano | findstr :3930
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3930 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3930
From Windows
Test-NetConnection HOST -Port 3930
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3930

Block port 3930 in the firewall

ufw
sudo ufw deny 3930/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3930 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3930 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3930' -Direction Inbound -Protocol TCP -LocalPort 3930 -Action Block
ufw
sudo ufw deny 3930/udp
iptables
sudo iptables -A INPUT -p udp --dport 3930 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3930 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3930' -Direction Inbound -Protocol UDP -LocalPort 3930 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.