CyberHunter
Local dataset, no network
// Other services

Port 3899: ITV Port

Port 3899 is assigned by IANA to itv-control (ITV Port).

3899

How itv-control works

Other services
client:3899itv-controlresponse client:3899itv-controlresponse

The client sends a request to port 3899 and the itv-control 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 3899 dangerous?

We have no specific security note for port 3899. 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 3899

ServicePortTransportDescriptionReferenceUpdated
itv-control 3899 TCP, UDP ITV Port - 2003-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 3899, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3899'      # process listening on 3899
sudo lsof -nP -i :3899

macOS

sudo lsof -nP -i :3899

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3899 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3899
netstat -ano | findstr :3899

From another machine

nmap -p 3899 -sV <host>
sudo nmap -sU -p 3899 <host>
nc -zv <host> 3899

Block it in the firewall

sudo ufw deny 3899/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3899" -Direction Inbound -LocalPort 3899 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3899 used for?

Port 3899 is assigned by IANA to itv-control (ITV Port).

Is port 3899 TCP or UDP?

Port 3899 is registered for TCP and UDP.

Is it safe to open port 3899?

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 3899 is open?

On Linux run "ss -ltnup 'sport = :3899'", on macOS "lsof -nP -i :3899", and on Windows "netstat -ano | findstr :3899" to see the local process. From another machine, "nmap -p 3899 <host>" shows whether it is reachable.

05 Related
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