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// Other services

Port 11000: IRISA

Port 11000 is assigned by IANA to irisa (IRISA).

11000

How irisa works

Other services
client:11000irisaresponse client:11000irisaresponse

The client sends a request to port 11000 and the irisa 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 11000 dangerous?

We have no specific security note for port 11000. 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 11000

ServicePortTransportDescriptionReferenceUpdated
irisa 11000 TCP, UDP IRISA - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 11000, and is it reachable?

Linux

sudo ss -ltnup 'sport = :11000'      # process listening on 11000
sudo lsof -nP -i :11000

macOS

sudo lsof -nP -i :11000

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 11000 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 11000
netstat -ano | findstr :11000

From another machine

nmap -p 11000 -sV <host>
sudo nmap -sU -p 11000 <host>
nc -zv <host> 11000

Block it in the firewall

sudo ufw deny 11000/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 11000" -Direction Inbound -LocalPort 11000 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 11000 used for?

Port 11000 is assigned by IANA to irisa (IRISA).

Is port 11000 TCP or UDP?

Port 11000 is registered for TCP and UDP.

Is it safe to open port 11000?

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 11000 is open?

On Linux run "ss -ltnup 'sport = :11000'", on macOS "lsof -nP -i :11000", and on Windows "netstat -ano | findstr :11000" to see the local process. From another machine, "nmap -p 11000 <host>" shows whether it is reachable.

05 Related
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