CyberHunter
Local dataset, no network
// Other services

Port 3972: ict-control Protocol

Port 3972 is assigned by IANA to iconp (ict-control Protocol).

3972

How iconp works

Other services
client:3972iconpresponse client:3972iconpresponse

The client sends a request to port 3972 and the iconp 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 3972 dangerous?

We have no specific security note for port 3972. 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 3972

ServicePortTransportDescriptionReferenceUpdated
iconp 3972 TCP, UDP ict-control Protocol - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 3972, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3972'      # process listening on 3972
sudo lsof -nP -i :3972

macOS

sudo lsof -nP -i :3972

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3972 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3972
netstat -ano | findstr :3972

From another machine

nmap -p 3972 -sV <host>
sudo nmap -sU -p 3972 <host>
nc -zv <host> 3972

Block it in the firewall

sudo ufw deny 3972/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3972" -Direction Inbound -LocalPort 3972 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3972 used for?

Port 3972 is assigned by IANA to iconp (ict-control Protocol).

Is port 3972 TCP or UDP?

Port 3972 is registered for TCP and UDP.

Is it safe to open port 3972?

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 3972 is open?

On Linux run "ss -ltnup 'sport = :3972'", on macOS "lsof -nP -i :3972", and on Windows "netstat -ano | findstr :3972" to see the local process. From another machine, "nmap -p 3972 <host>" shows whether it is reachable.

05 Related
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