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Port 3623 (haipe-discover)

IANA assigns port 3623 to haipe-discover: HAIPIS Dynamic Discovery.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
haipe-discover TCP HAIPIS Dynamic Discovery Mike Irani -
haipe-discover UDP HAIPIS Dynamic Discovery Mike Irani -

Registry dates for this port: registered 2002-10.

Check what is listening on port 3623

Linux: is anything listening on TCP 3623?
sudo ss -tlnp 'sport = :3623'
Linux: UDP 3623
sudo ss -ulnp 'sport = :3623'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3623
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3623 '
Windows (Command Prompt)
netstat -ano | findstr :3623
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3623 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3623
From Windows
Test-NetConnection HOST -Port 3623
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3623

Block port 3623 in the firewall

ufw
sudo ufw deny 3623/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3623 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3623 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3623' -Direction Inbound -Protocol TCP -LocalPort 3623 -Action Block
ufw
sudo ufw deny 3623/udp
iptables
sudo iptables -A INPUT -p udp --dport 3623 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3623 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3623' -Direction Inbound -Protocol UDP -LocalPort 3623 -Action Block

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