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// Other services

Port 4743: openhpi HPI service

Port 4743 is assigned by IANA to openhpid (openhpi HPI service).

4743

How openhpid works

Other services
client:4743openhpidresponse client:4743openhpidresponse

The client sends a request to port 4743 and the openhpid 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 4743 dangerous?

We have no specific security note for port 4743. 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 4743

ServicePortTransportDescriptionReferenceUpdated
openhpid 4743 TCP, UDP openhpi HPI service - 2006-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 4743, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4743'      # process listening on 4743
sudo lsof -nP -i :4743

macOS

sudo lsof -nP -i :4743

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4743 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4743
netstat -ano | findstr :4743

From another machine

nmap -p 4743 -sV <host>
sudo nmap -sU -p 4743 <host>
nc -zv <host> 4743

Block it in the firewall

sudo ufw deny 4743/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4743" -Direction Inbound -LocalPort 4743 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4743 used for?

Port 4743 is assigned by IANA to openhpid (openhpi HPI service).

Is port 4743 TCP or UDP?

Port 4743 is registered for TCP and UDP.

Is it safe to open port 4743?

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 4743 is open?

On Linux run "ss -ltnup 'sport = :4743'", on macOS "lsof -nP -i :4743", and on Windows "netstat -ano | findstr :4743" to see the local process. From another machine, "nmap -p 4743 <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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