HTTPfy

Port 4390 (wiegand)

IANA assigns port 4390 to wiegand: Physical Access Control.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
wiegand TCP Physical Access Control Scott Guthery 2 -
wiegand UDP Physical Access Control Scott Guthery 2 -

Registry dates for this port: registered 2008-08-25.

Check what is listening on port 4390

Linux: is anything listening on TCP 4390?
sudo ss -tlnp 'sport = :4390'
Linux: UDP 4390
sudo ss -ulnp 'sport = :4390'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4390
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4390 '
Windows (Command Prompt)
netstat -ano | findstr :4390
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4390 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4390
From Windows
Test-NetConnection HOST -Port 4390
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4390

Block port 4390 in the firewall

ufw
sudo ufw deny 4390/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4390 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4390 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4390' -Direction Inbound -Protocol TCP -LocalPort 4390 -Action Block
ufw
sudo ufw deny 4390/udp
iptables
sudo iptables -A INPUT -p udp --dport 4390 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4390 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4390' -Direction Inbound -Protocol UDP -LocalPort 4390 -Action Block

Related ports

4379ctdb4389xandros-cms4391apwi-imserver4392apwi-rxserver

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