CyberHunter
Local dataset, no network
// Other services

Port 674: ACAP

Port 674 is assigned by IANA to acap (ACAP).

674

How acap works

Other services
client:674acapresponse client:674acapresponse

The client sends a request to port 674 and the acap 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 674 dangerous?

We have no specific security note for port 674. 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 674

ServicePortTransportDescriptionReferenceUpdated
acap 674 TCP, UDP ACAP - 2010-10-15

// source: IANA service name and port number registry

03 Check it

Which program uses port 674, and is it reachable?

Linux

sudo ss -ltnup 'sport = :674'      # process listening on 674
sudo lsof -nP -i :674

macOS

sudo lsof -nP -i :674

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 674 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 674
netstat -ano | findstr :674

From another machine

nmap -p 674 -sV <host>
sudo nmap -sU -p 674 <host>
nc -zv <host> 674

Block it in the firewall

sudo ufw deny 674/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 674" -Direction Inbound -LocalPort 674 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 674 used for?

Port 674 is assigned by IANA to acap (ACAP).

Is port 674 TCP or UDP?

Port 674 is registered for TCP and UDP.

Is it safe to open port 674?

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 674 is open?

On Linux run "ss -ltnup 'sport = :674'", on macOS "lsof -nP -i :674", and on Windows "netstat -ano | findstr :674" to see the local process. From another machine, "nmap -p 674 <host>" shows whether it is reachable.

05 Related
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