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// Other services

Port 2019:

Port 2019 is assigned by IANA to about (), whosockami ().

2019

How about works

Other services
client:2019aboutresponse client:2019aboutresponse

The client sends a request to port 2019 and the about service answers.

Transport
UDP · TCP
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 2019 dangerous?

We have no specific security note for port 2019. 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 2019

ServicePortTransportDescriptionReferenceUpdated
about 2019 UDP - -
whosockami 2019 TCP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2019, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2019'      # process listening on 2019
sudo lsof -nP -i :2019

macOS

sudo lsof -nP -i :2019

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2019 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2019
netstat -ano | findstr :2019

From another machine

nmap -p 2019 -sV <host>
sudo nmap -sU -p 2019 <host>
nc -zv <host> 2019

Block it in the firewall

sudo ufw deny 2019/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2019" -Direction Inbound -LocalPort 2019 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2019 used for?

Port 2019 is assigned by IANA to about (), whosockami ().

Is port 2019 TCP or UDP?

Port 2019 is registered for UDP and TCP.

Is it safe to open port 2019?

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 2019 is open?

On Linux run "ss -ltnup 'sport = :2019'", on macOS "lsof -nP -i :2019", and on Windows "netstat -ano | findstr :2019" to see the local process. From another machine, "nmap -p 2019 <host>" shows whether it is reachable.

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