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// Other services

Port 1130: CAC App Service Protocol

Port 1130 is assigned by IANA to casp (CAC App Service Protocol).

1130

How casp works

Other services
client:1130caspresponse client:1130caspresponse

The client sends a request to port 1130 and the casp 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 1130 dangerous?

We have no specific security note for port 1130. 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 1130

ServicePortTransportDescriptionReferenceUpdated
casp 1130 TCP, UDP CAC App Service Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1130, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1130'      # process listening on 1130
sudo lsof -nP -i :1130

macOS

sudo lsof -nP -i :1130

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1130 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1130
netstat -ano | findstr :1130

From another machine

nmap -p 1130 -sV <host>
sudo nmap -sU -p 1130 <host>
nc -zv <host> 1130

Block it in the firewall

sudo ufw deny 1130/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1130" -Direction Inbound -LocalPort 1130 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1130 used for?

Port 1130 is assigned by IANA to casp (CAC App Service Protocol).

Is port 1130 TCP or UDP?

Port 1130 is registered for TCP and UDP.

Is it safe to open port 1130?

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 1130 is open?

On Linux run "ss -ltnup 'sport = :1130'", on macOS "lsof -nP -i :1130", and on Windows "netstat -ano | findstr :1130" to see the local process. From another machine, "nmap -p 1130 <host>" shows whether it is reachable.

05 Related
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