CyberHunter
LinkedIn profile - Bastien Cordier Email: contact@bastiencordier.pro
// Other services

Port 1676: netcomm1

Port 1676 is assigned by IANA to netcomm1 (netcomm1), netcomm2 (netcomm2).

1676

How netcomm1 works

Other services
client:1676netcomm1response client:1676netcomm1response

The client sends a request to port 1676 and the netcomm1 service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 1676 dangerous?

We have no specific security note for port 1676. 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 1676

ServicePortTransportDescriptionReferenceUpdated
netcomm1 1676 TCP netcomm1 - -
netcomm2 1676 UDP netcomm2 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1676, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1676'      # process listening on 1676
sudo lsof -nP -i :1676

macOS

sudo lsof -nP -i :1676

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1676 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1676
netstat -ano | findstr :1676

From another machine

nmap -p 1676 -sV <host>
sudo nmap -sU -p 1676 <host>
nc -zv <host> 1676

Block it in the firewall

sudo ufw deny 1676/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1676" -Direction Inbound -LocalPort 1676 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1676 used for?

Port 1676 is assigned by IANA to netcomm1 (netcomm1), netcomm2 (netcomm2).

Is port 1676 TCP or UDP?

Port 1676 is registered for TCP and UDP.

Is it safe to open port 1676?

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 1676 is open?

On Linux run "ss -ltnup 'sport = :1676'", on macOS "lsof -nP -i :1676", and on Windows "netstat -ano | findstr :1676" to see the local process. From another machine, "nmap -p 1676 <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

Latest vulnerability news

All news