CyberHunter
Local dataset, no network
// Other services

Port 2001:

Port 2001 is assigned by IANA to dc (), wizard (curry).

2001

How dc works

Other services
client:2001dcresponse client:2001dcresponse

The client sends a request to port 2001 and the dc 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 2001 dangerous?

We have no specific security note for port 2001. 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 2001

ServicePortTransportDescriptionReferenceUpdated
dc 2001 TCP - -
wizard 2001 UDP curry - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2001, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2001'      # process listening on 2001
sudo lsof -nP -i :2001

macOS

sudo lsof -nP -i :2001

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2001 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2001
netstat -ano | findstr :2001

From another machine

nmap -p 2001 -sV <host>
sudo nmap -sU -p 2001 <host>
nc -zv <host> 2001

Block it in the firewall

sudo ufw deny 2001/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2001" -Direction Inbound -LocalPort 2001 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2001 used for?

Port 2001 is assigned by IANA to dc (), wizard (curry).

Is port 2001 TCP or UDP?

Port 2001 is registered for TCP and UDP.

Is it safe to open port 2001?

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 2001 is open?

On Linux run "ss -ltnup 'sport = :2001'", on macOS "lsof -nP -i :2001", and on Windows "netstat -ano | findstr :2001" to see the local process. From another machine, "nmap -p 2001 <host>" shows whether it is reachable.

05 Related
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