CyberHunter
Local dataset, no network
// Other services

Port 21849: NetSpeak Corp. Credit Processing System

Port 21849 is assigned by IANA to netspeak-cps (NetSpeak Corp. Credit Processing System).

21849

How netspeak-cps works

Other services
client:21849netspeak-cpsresponse client:21849netspeak-cpsresponse

The client sends a request to port 21849 and the netspeak-cps 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 21849 dangerous?

We have no specific security note for port 21849. 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 21849

ServicePortTransportDescriptionReferenceUpdated
netspeak-cps 21849 TCP, UDP NetSpeak Corp. Credit Processing System - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 21849, and is it reachable?

Linux

sudo ss -ltnup 'sport = :21849'      # process listening on 21849
sudo lsof -nP -i :21849

macOS

sudo lsof -nP -i :21849

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 21849 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 21849
netstat -ano | findstr :21849

From another machine

nmap -p 21849 -sV <host>
sudo nmap -sU -p 21849 <host>
nc -zv <host> 21849

Block it in the firewall

sudo ufw deny 21849/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 21849" -Direction Inbound -LocalPort 21849 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 21849 used for?

Port 21849 is assigned by IANA to netspeak-cps (NetSpeak Corp. Credit Processing System).

Is port 21849 TCP or UDP?

Port 21849 is registered for TCP and UDP.

Is it safe to open port 21849?

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 21849 is open?

On Linux run "ss -ltnup 'sport = :21849'", on macOS "lsof -nP -i :21849", and on Windows "netstat -ano | findstr :21849" to see the local process. From another machine, "nmap -p 21849 <host>" shows whether it is reachable.

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