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Port 4676 (dhct-alerts)

IANA assigns port 4676 to dhct-alerts: BIAP Generic Alert.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dhct-alerts TCP BIAP Generic Alert Louis Slothouber -
dhct-alerts UDP BIAP Generic Alert Louis Slothouber -

Registry dates for this port: registered 2005-08.

Check what is listening on port 4676

Linux: is anything listening on TCP 4676?
sudo ss -tlnp 'sport = :4676'
Linux: UDP 4676
sudo ss -ulnp 'sport = :4676'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4676
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4676 '
Windows (Command Prompt)
netstat -ano | findstr :4676
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4676 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4676
From Windows
Test-NetConnection HOST -Port 4676
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4676

Block port 4676 in the firewall

ufw
sudo ufw deny 4676/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4676 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4676 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4676' -Direction Inbound -Protocol TCP -LocalPort 4676 -Action Block
ufw
sudo ufw deny 4676/udp
iptables
sudo iptables -A INPUT -p udp --dport 4676 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4676 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4676' -Direction Inbound -Protocol UDP -LocalPort 4676 -Action Block

Related ports

4674appiq-mgmt4675dhct-status4677bcs4678traversal

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