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// Other services

Port 1000:

Port 1000 is assigned by IANA to cadlock2 ().

1000

How cadlock2 works

Other services
client:1000cadlock2response client:1000cadlock2response

The client sends a request to port 1000 and the cadlock2 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 1000 dangerous?

We have no specific security note for port 1000. 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 1000

ServicePortTransportDescriptionReferenceUpdated
cadlock2 1000 TCP, UDP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1000, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1000'      # process listening on 1000
sudo lsof -nP -i :1000

macOS

sudo lsof -nP -i :1000

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1000 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1000
netstat -ano | findstr :1000

From another machine

nmap -p 1000 -sV <host>
sudo nmap -sU -p 1000 <host>
nc -zv <host> 1000

Block it in the firewall

sudo ufw deny 1000/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1000" -Direction Inbound -LocalPort 1000 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1000 used for?

Port 1000 is assigned by IANA to cadlock2 ().

Is port 1000 TCP or UDP?

Port 1000 is registered for TCP and UDP.

Is it safe to open port 1000?

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 1000 is open?

On Linux run "ss -ltnup 'sport = :1000'", on macOS "lsof -nP -i :1000", and on Windows "netstat -ano | findstr :1000" to see the local process. From another machine, "nmap -p 1000 <host>" shows whether it is reachable.

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