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// Other services

Port 4676: BIAP Generic Alert

Port 4676 is assigned by IANA to dhct-alerts (BIAP Generic Alert).

4676

How dhct-alerts works

Other services
client:4676dhct-alertsresponse client:4676dhct-alertsresponse

The client sends a request to port 4676 and the dhct-alerts service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 4676 dangerous?

We have no specific security note for port 4676. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 4676

ServicePortTransportDescriptionReferenceUpdated
dhct-alerts 4676 TCP, UDP BIAP Generic Alert - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 4676, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4676'      # process listening on 4676
sudo lsof -nP -i :4676

macOS

sudo lsof -nP -i :4676

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4676 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4676
netstat -ano | findstr :4676

From another machine

nmap -p 4676 -sV <host>
sudo nmap -sU -p 4676 <host>
nc -zv <host> 4676

Block it in the firewall

sudo ufw deny 4676/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4676" -Direction Inbound -LocalPort 4676 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4676 used for?

Port 4676 is assigned by IANA to dhct-alerts (BIAP Generic Alert).

Is port 4676 TCP or UDP?

Port 4676 is registered for TCP and UDP.

Is it safe to open port 4676?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 4676 is open?

On Linux run "ss -ltnup 'sport = :4676'", on macOS "lsof -nP -i :4676", and on Windows "netstat -ano | findstr :4676" to see the local process. From another machine, "nmap -p 4676 <host>" shows whether it is reachable.

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