CyberHunter
Local dataset, no network
// Other services

Port 242: Direct

Port 242 is assigned by IANA to direct (Direct).

242

How direct works

Other services
client:242directresponse client:242directresponse

The client sends a request to port 242 and the direct 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 242 dangerous?

We have no specific security note for port 242. 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 242

ServicePortTransportDescriptionReferenceUpdated
direct 242 TCP, UDP Direct - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 242, and is it reachable?

Linux

sudo ss -ltnup 'sport = :242'      # process listening on 242
sudo lsof -nP -i :242

macOS

sudo lsof -nP -i :242

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 242 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 242
netstat -ano | findstr :242

From another machine

nmap -p 242 -sV <host>
sudo nmap -sU -p 242 <host>
nc -zv <host> 242

Block it in the firewall

sudo ufw deny 242/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 242" -Direction Inbound -LocalPort 242 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 242 used for?

Port 242 is assigned by IANA to direct (Direct).

Is port 242 TCP or UDP?

Port 242 is registered for TCP and UDP.

Is it safe to open port 242?

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 242 is open?

On Linux run "ss -ltnup 'sport = :242'", on macOS "lsof -nP -i :242", and on Windows "netstat -ano | findstr :242" to see the local process. From another machine, "nmap -p 242 <host>" shows whether it is reachable.

05 Related
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