CyberHunter
Local dataset, no network
// Other services

Port 1683: ncpm-hip

Port 1683 is assigned by IANA to ncpm-hip (ncpm-hip).

1683

How ncpm-hip works

Other services
client:1683ncpm-hipresponse client:1683ncpm-hipresponse

The client sends a request to port 1683 and the ncpm-hip 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 1683 dangerous?

We have no specific security note for port 1683. 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 1683

ServicePortTransportDescriptionReferenceUpdated
ncpm-hip 1683 TCP, UDP ncpm-hip - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1683, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1683'      # process listening on 1683
sudo lsof -nP -i :1683

macOS

sudo lsof -nP -i :1683

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1683 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1683
netstat -ano | findstr :1683

From another machine

nmap -p 1683 -sV <host>
sudo nmap -sU -p 1683 <host>
nc -zv <host> 1683

Block it in the firewall

sudo ufw deny 1683/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1683" -Direction Inbound -LocalPort 1683 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1683 used for?

Port 1683 is assigned by IANA to ncpm-hip (ncpm-hip).

Is port 1683 TCP or UDP?

Port 1683 is registered for TCP and UDP.

Is it safe to open port 1683?

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 1683 is open?

On Linux run "ss -ltnup 'sport = :1683'", on macOS "lsof -nP -i :1683", and on Windows "netstat -ano | findstr :1683" to see the local process. From another machine, "nmap -p 1683 <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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