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Port 4743 (openhpid)

IANA assigns port 4743 to openhpid: openhpi HPI service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
openhpid TCP openhpi HPI service Thomas Kanngieser -
openhpid UDP openhpi HPI service Thomas Kanngieser -

Registry dates for this port: registered 2006-01.

Check what is listening on port 4743

Linux: is anything listening on TCP 4743?
sudo ss -tlnp 'sport = :4743'
Linux: UDP 4743
sudo ss -ulnp 'sport = :4743'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4743
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4743 '
Windows (Command Prompt)
netstat -ano | findstr :4743
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4743 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4743
From Windows
Test-NetConnection HOST -Port 4743
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4743

Block port 4743 in the firewall

ufw
sudo ufw deny 4743/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4743 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4743 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4743' -Direction Inbound -Protocol TCP -LocalPort 4743 -Action Block
ufw
sudo ufw deny 4743/udp
iptables
sudo iptables -A INPUT -p udp --dport 4743 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4743 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4743' -Direction Inbound -Protocol UDP -LocalPort 4743 -Action Block

Related ports

4741lumimgrd4742sicct, sicct-sdp4744ifsp4745fmp

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