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Port 3640 (netplay-port1)

IANA assigns port 3640 to netplay-port1: Netplay Port 1.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netplay-port1 TCP Netplay Port 1 - -
netplay-port1 UDP Netplay Port 1 - -

Check what is listening on port 3640

Linux: is anything listening on TCP 3640?
sudo ss -tlnp 'sport = :3640'
Linux: UDP 3640
sudo ss -ulnp 'sport = :3640'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3640
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3640 '
Windows (Command Prompt)
netstat -ano | findstr :3640
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3640 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3640
From Windows
Test-NetConnection HOST -Port 3640
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3640

Block port 3640 in the firewall

ufw
sudo ufw deny 3640/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3640 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3640 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3640' -Direction Inbound -Protocol TCP -LocalPort 3640 -Action Block
ufw
sudo ufw deny 3640/udp
iptables
sudo iptables -A INPUT -p udp --dport 3640 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3640 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3640' -Direction Inbound -Protocol UDP -LocalPort 3640 -Action Block

Related ports

3638ehp-backup3639xap-ha3641netplay-port23642juxml-port

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.