CyberHunter
Local dataset, no network
// Other services

Port 4301: Diagnostic Data

Port 4301 is assigned by IANA to d-data (Diagnostic Data).

4301

How d-data works

Other services
client:4301d-dataresponse client:4301d-dataresponse

The client sends a request to port 4301 and the d-data 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 4301 dangerous?

We have no specific security note for port 4301. 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 4301

ServicePortTransportDescriptionReferenceUpdated
d-data 4301 TCP, UDP Diagnostic Data - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4301, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4301'      # process listening on 4301
sudo lsof -nP -i :4301

macOS

sudo lsof -nP -i :4301

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4301 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4301
netstat -ano | findstr :4301

From another machine

nmap -p 4301 -sV <host>
sudo nmap -sU -p 4301 <host>
nc -zv <host> 4301

Block it in the firewall

sudo ufw deny 4301/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4301" -Direction Inbound -LocalPort 4301 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4301 used for?

Port 4301 is assigned by IANA to d-data (Diagnostic Data).

Is port 4301 TCP or UDP?

Port 4301 is registered for TCP and UDP.

Is it safe to open port 4301?

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 4301 is open?

On Linux run "ss -ltnup 'sport = :4301'", on macOS "lsof -nP -i :4301", and on Windows "netstat -ano | findstr :4301" to see the local process. From another machine, "nmap -p 4301 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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