CyberHunter
Local dataset, no network
// Other services

Port 1311: RxMon

Port 1311 is assigned by IANA to rxmon (RxMon).

1311

How rxmon works

Other services
client:1311rxmonresponse client:1311rxmonresponse

The client sends a request to port 1311 and the rxmon 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 1311 dangerous?

We have no specific security note for port 1311. 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 1311

ServicePortTransportDescriptionReferenceUpdated
rxmon 1311 TCP, UDP RxMon - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1311, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1311'      # process listening on 1311
sudo lsof -nP -i :1311

macOS

sudo lsof -nP -i :1311

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1311 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1311
netstat -ano | findstr :1311

From another machine

nmap -p 1311 -sV <host>
sudo nmap -sU -p 1311 <host>
nc -zv <host> 1311

Block it in the firewall

sudo ufw deny 1311/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1311" -Direction Inbound -LocalPort 1311 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1311 used for?

Port 1311 is assigned by IANA to rxmon (RxMon).

Is port 1311 TCP or UDP?

Port 1311 is registered for TCP and UDP.

Is it safe to open port 1311?

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 1311 is open?

On Linux run "ss -ltnup 'sport = :1311'", on macOS "lsof -nP -i :1311", and on Windows "netstat -ano | findstr :1311" to see the local process. From another machine, "nmap -p 1311 <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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