CyberHunter
Local dataset, no network
// Other services

Port 4073: Interactive Remote Application Pairing Protocol

Port 4073 is assigned by IANA to iRAPP (Interactive Remote Application Pairing Protocol).

4073

How iRAPP works

Other services
client:4073iRAPPresponse client:4073iRAPPresponse

The client sends a request to port 4073 and the iRAPP 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 4073 dangerous?

We have no specific security note for port 4073. 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 4073

ServicePortTransportDescriptionReferenceUpdated
iRAPP 4073 TCP, UDP Interactive Remote Application Pairing Protocol - 2016-11-23

// source: IANA service name and port number registry

03 Check it

Which program uses port 4073, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4073'      # process listening on 4073
sudo lsof -nP -i :4073

macOS

sudo lsof -nP -i :4073

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4073 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4073
netstat -ano | findstr :4073

From another machine

nmap -p 4073 -sV <host>
sudo nmap -sU -p 4073 <host>
nc -zv <host> 4073

Block it in the firewall

sudo ufw deny 4073/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4073" -Direction Inbound -LocalPort 4073 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4073 used for?

Port 4073 is assigned by IANA to iRAPP (Interactive Remote Application Pairing Protocol).

Is port 4073 TCP or UDP?

Port 4073 is registered for TCP and UDP.

Is it safe to open port 4073?

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 4073 is open?

On Linux run "ss -ltnup 'sport = :4073'", on macOS "lsof -nP -i :4073", and on Windows "netstat -ano | findstr :4073" to see the local process. From another machine, "nmap -p 4073 <host>" shows whether it is reachable.

05 Related
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