HTTPfy

Port 20005 (openwebnet)

IANA assigns port 20005 to openwebnet: OpenWebNet protocol for electric network.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
openwebnet TCP OpenWebNet protocol for electric network BTicino S p A -
openwebnet UDP OpenWebNet protocol for electric network BTicino S p A -

Registry dates for this port: registered 2008-04-09.

Check what is listening on port 20005

Linux: is anything listening on TCP 20005?
sudo ss -tlnp 'sport = :20005'
Linux: UDP 20005
sudo ss -ulnp 'sport = :20005'
Linux / macOS: which process owns the port
sudo lsof -nP -i :20005
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':20005 '
Windows (Command Prompt)
netstat -ano | findstr :20005
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 20005 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 20005
From Windows
Test-NetConnection HOST -Port 20005
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 20005

Block port 20005 in the firewall

ufw
sudo ufw deny 20005/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 20005 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 20005 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 20005' -Direction Inbound -Protocol TCP -LocalPort 20005 -Action Block
ufw
sudo ufw deny 20005/udp
iptables
sudo iptables -A INPUT -p udp --dport 20005 -j DROP
nftables
sudo nft add rule inet filter input udp dport 20005 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 20005' -Direction Inbound -Protocol UDP -LocalPort 20005 -Action Block

Related ports

20002commtact-http20003commtact-https20012ss-idi-disc20013ss-idi

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