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Port 3639 (xap-ha)

IANA assigns port 3639 to xap-ha: Extensible Automation.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
xap-ha TCP Extensible Automation Mark Harrison -
xap-ha UDP Extensible Automation Mark Harrison -

Registry dates for this port: registered 2002-11.

Check what is listening on port 3639

Linux: is anything listening on TCP 3639?
sudo ss -tlnp 'sport = :3639'
Linux: UDP 3639
sudo ss -ulnp 'sport = :3639'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3639
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3639 '
Windows (Command Prompt)
netstat -ano | findstr :3639
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3639 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3639
From Windows
Test-NetConnection HOST -Port 3639
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3639

Block port 3639 in the firewall

ufw
sudo ufw deny 3639/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3639 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3639 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3639' -Direction Inbound -Protocol TCP -LocalPort 3639 -Action Block
ufw
sudo ufw deny 3639/udp
iptables
sudo iptables -A INPUT -p udp --dport 3639 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3639 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3639' -Direction Inbound -Protocol UDP -LocalPort 3639 -Action Block

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3637scservp3638ehp-backup3640netplay-port13641netplay-port2

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