CyberHunter
Local dataset, no network
// Other services

Port 4791: IP Routable RocE

Port 4791 is assigned by IANA to roce (IP Routable RocE).

4791

How roce works

Other services
client:4791roceresponse client:4791roceresponse

The client sends a request to port 4791 and the roce service answers.

Transport
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 4791 dangerous?

We have no specific security note for port 4791. 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 4791

ServicePortTransportDescriptionReferenceUpdated
roce 4791 UDP IP Routable RocE - 2014-10-17
-4791-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4791, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4791'      # process listening on 4791
sudo lsof -nP -i :4791

macOS

sudo lsof -nP -i :4791

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4791 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4791
netstat -ano | findstr :4791

From another machine

nmap -p 4791 -sV <host>
sudo nmap -sU -p 4791 <host>
nc -zv <host> 4791

Block it in the firewall

sudo ufw deny 4791/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4791" -Direction Inbound -LocalPort 4791 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 4791 used for?

Port 4791 is assigned by IANA to roce (IP Routable RocE).

Is port 4791 TCP or UDP?

Port 4791 is registered for UDP.

Is it safe to open port 4791?

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 4791 is open?

On Linux run "ss -ltnup 'sport = :4791'", on macOS "lsof -nP -i :4791", and on Windows "netstat -ano | findstr :4791" to see the local process. From another machine, "nmap -p 4791 <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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