CyberHunter
Local dataset, no network
// Other services

Port 11321: Arena Server Listen

Port 11321 is assigned by IANA to arena-server (Arena Server Listen).

11321

How arena-server works

Other services
client:11321arena-serverresponse client:11321arena-serverresponse

The client sends a request to port 11321 and the arena-server 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 11321 dangerous?

We have no specific security note for port 11321. 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 11321

ServicePortTransportDescriptionReferenceUpdated
arena-server 11321 TCP, UDP Arena Server Listen - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 11321, and is it reachable?

Linux

sudo ss -ltnup 'sport = :11321'      # process listening on 11321
sudo lsof -nP -i :11321

macOS

sudo lsof -nP -i :11321

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 11321 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 11321
netstat -ano | findstr :11321

From another machine

nmap -p 11321 -sV <host>
sudo nmap -sU -p 11321 <host>
nc -zv <host> 11321

Block it in the firewall

sudo ufw deny 11321/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 11321" -Direction Inbound -LocalPort 11321 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 11321 used for?

Port 11321 is assigned by IANA to arena-server (Arena Server Listen).

Is port 11321 TCP or UDP?

Port 11321 is registered for TCP and UDP.

Is it safe to open port 11321?

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 11321 is open?

On Linux run "ss -ltnup 'sport = :11321'", on macOS "lsof -nP -i :11321", and on Windows "netstat -ano | findstr :11321" to see the local process. From another machine, "nmap -p 11321 <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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