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Port 5628 (htrust)

IANA assigns port 5628 to htrust: HTrust API.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
htrust TCP HTrust API Karl Olafsson -
htrust UDP HTrust API Karl Olafsson -

Registry dates for this port: registered 2008-10-24.

Check what is listening on port 5628

Linux: is anything listening on TCP 5628?
sudo ss -tlnp 'sport = :5628'
Linux: UDP 5628
sudo ss -ulnp 'sport = :5628'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5628
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5628 '
Windows (Command Prompt)
netstat -ano | findstr :5628
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5628 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5628
From Windows
Test-NetConnection HOST -Port 5628
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5628

Block port 5628 in the firewall

ufw
sudo ufw deny 5628/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5628 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5628 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5628' -Direction Inbound -Protocol TCP -LocalPort 5628 -Action Block
ufw
sudo ufw deny 5628/udp
iptables
sudo iptables -A INPUT -p udp --dport 5628 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5628 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5628' -Direction Inbound -Protocol UDP -LocalPort 5628 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.