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// Other services

Port 3242: Session Description ID

Port 3242 is assigned by IANA to sdp-id-port (Session Description ID).

3242

How sdp-id-port works

Other services
client:3242sdp-id-portresponse client:3242sdp-id-portresponse

The client sends a request to port 3242 and the sdp-id-port 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 3242 dangerous?

We have no specific security note for port 3242. 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 3242

ServicePortTransportDescriptionReferenceUpdated
sdp-id-port 3242 TCP, UDP Session Description ID - 2002-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 3242, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3242'      # process listening on 3242
sudo lsof -nP -i :3242

macOS

sudo lsof -nP -i :3242

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3242 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3242
netstat -ano | findstr :3242

From another machine

nmap -p 3242 -sV <host>
sudo nmap -sU -p 3242 <host>
nc -zv <host> 3242

Block it in the firewall

sudo ufw deny 3242/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3242" -Direction Inbound -LocalPort 3242 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3242 used for?

Port 3242 is assigned by IANA to sdp-id-port (Session Description ID).

Is port 3242 TCP or UDP?

Port 3242 is registered for TCP and UDP.

Is it safe to open port 3242?

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 3242 is open?

On Linux run "ss -ltnup 'sport = :3242'", on macOS "lsof -nP -i :3242", and on Windows "netstat -ano | findstr :3242" to see the local process. From another machine, "nmap -p 3242 <host>" shows whether it is reachable.

05 Related
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