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// Other services

Port 6999: IATP-normalPri

Port 6999 is assigned by IANA to iatp-normalpri (IATP-normalPri).

6999

How iatp-normalpri works

Other services
client:6999iatp-normalpriresponse client:6999iatp-normalpriresponse

The client sends a request to port 6999 and the iatp-normalpri 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 6999 dangerous?

We have no specific security note for port 6999. 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 6999

ServicePortTransportDescriptionReferenceUpdated
iatp-normalpri 6999 TCP, UDP IATP-normalPri - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 6999, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6999'      # process listening on 6999
sudo lsof -nP -i :6999

macOS

sudo lsof -nP -i :6999

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6999 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6999
netstat -ano | findstr :6999

From another machine

nmap -p 6999 -sV <host>
sudo nmap -sU -p 6999 <host>
nc -zv <host> 6999

Block it in the firewall

sudo ufw deny 6999/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6999" -Direction Inbound -LocalPort 6999 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6999 used for?

Port 6999 is assigned by IANA to iatp-normalpri (IATP-normalPri).

Is port 6999 TCP or UDP?

Port 6999 is registered for TCP and UDP.

Is it safe to open port 6999?

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 6999 is open?

On Linux run "ss -ltnup 'sport = :6999'", on macOS "lsof -nP -i :6999", and on Windows "netstat -ano | findstr :6999" to see the local process. From another machine, "nmap -p 6999 <host>" shows whether it is reachable.

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