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// Other services

Port 2151: DOCENT

Port 2151 is assigned by IANA to docent (DOCENT).

2151

How docent works

Other services
client:2151docentresponse client:2151docentresponse

The client sends a request to port 2151 and the docent 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 2151 dangerous?

We have no specific security note for port 2151. 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 2151

ServicePortTransportDescriptionReferenceUpdated
docent 2151 TCP, UDP DOCENT - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2151, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2151'      # process listening on 2151
sudo lsof -nP -i :2151

macOS

sudo lsof -nP -i :2151

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2151 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2151
netstat -ano | findstr :2151

From another machine

nmap -p 2151 -sV <host>
sudo nmap -sU -p 2151 <host>
nc -zv <host> 2151

Block it in the firewall

sudo ufw deny 2151/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2151" -Direction Inbound -LocalPort 2151 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2151 used for?

Port 2151 is assigned by IANA to docent (DOCENT).

Is port 2151 TCP or UDP?

Port 2151 is registered for TCP and UDP.

Is it safe to open port 2151?

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 2151 is open?

On Linux run "ss -ltnup 'sport = :2151'", on macOS "lsof -nP -i :2151", and on Windows "netstat -ano | findstr :2151" to see the local process. From another machine, "nmap -p 2151 <host>" shows whether it is reachable.

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