CyberHunter
Local dataset, no network
// Other services

Port 1650: nkdn

Port 1650 is assigned by IANA to nkd (nkdn).

1650

How nkd works

Other services
client:1650nkdresponse client:1650nkdresponse

The client sends a request to port 1650 and the nkd 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 1650 dangerous?

We have no specific security note for port 1650. 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 1650

ServicePortTransportDescriptionReferenceUpdated
nkd 1650 TCP, UDP nkdn - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1650, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1650'      # process listening on 1650
sudo lsof -nP -i :1650

macOS

sudo lsof -nP -i :1650

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1650 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1650
netstat -ano | findstr :1650

From another machine

nmap -p 1650 -sV <host>
sudo nmap -sU -p 1650 <host>
nc -zv <host> 1650

Block it in the firewall

sudo ufw deny 1650/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1650" -Direction Inbound -LocalPort 1650 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1650 used for?

Port 1650 is assigned by IANA to nkd (nkdn).

Is port 1650 TCP or UDP?

Port 1650 is registered for TCP and UDP.

Is it safe to open port 1650?

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 1650 is open?

On Linux run "ss -ltnup 'sport = :1650'", on macOS "lsof -nP -i :1650", and on Windows "netstat -ano | findstr :1650" to see the local process. From another machine, "nmap -p 1650 <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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