CyberHunter
Local dataset, no network
// Other services

Port 678: GNU Generation Foundation NCP

Port 678 is assigned by IANA to ggf-ncp (GNU Generation Foundation NCP).

678

How ggf-ncp works

Other services
client:678ggf-ncpresponse client:678ggf-ncpresponse

The client sends a request to port 678 and the ggf-ncp 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 678 dangerous?

We have no specific security note for port 678. 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 678

ServicePortTransportDescriptionReferenceUpdated
ggf-ncp 678 TCP, UDP GNU Generation Foundation NCP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 678, and is it reachable?

Linux

sudo ss -ltnup 'sport = :678'      # process listening on 678
sudo lsof -nP -i :678

macOS

sudo lsof -nP -i :678

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 678 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 678
netstat -ano | findstr :678

From another machine

nmap -p 678 -sV <host>
sudo nmap -sU -p 678 <host>
nc -zv <host> 678

Block it in the firewall

sudo ufw deny 678/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 678" -Direction Inbound -LocalPort 678 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 678 used for?

Port 678 is assigned by IANA to ggf-ncp (GNU Generation Foundation NCP).

Is port 678 TCP or UDP?

Port 678 is registered for TCP and UDP.

Is it safe to open port 678?

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 678 is open?

On Linux run "ss -ltnup 'sport = :678'", on macOS "lsof -nP -i :678", and on Windows "netstat -ano | findstr :678" to see the local process. From another machine, "nmap -p 678 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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