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// Other services

Port 11489: ASG Cypress Secure Only

Port 11489 is assigned by IANA to asgcypresstcps (ASG Cypress Secure Only).

11489

How asgcypresstcps works

Other services
client:11489asgcypresstcpsresponse client:11489asgcypresstcpsresponse

The client sends a request to port 11489 and the asgcypresstcps service answers.

Transport
TCP
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 11489 dangerous?

We have no specific security note for port 11489. 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 11489

ServicePortTransportDescriptionReferenceUpdated
asgcypresstcps 11489 TCP ASG Cypress Secure Only - 2010-07-01
-11489-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 11489, and is it reachable?

Linux

sudo ss -ltnup 'sport = :11489'      # process listening on 11489
sudo lsof -nP -i :11489

macOS

sudo lsof -nP -i :11489

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 11489 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 11489
netstat -ano | findstr :11489

From another machine

nmap -p 11489 -sV <host>
nc -zv <host> 11489

Block it in the firewall

sudo ufw deny 11489/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 11489" -Direction Inbound -LocalPort 11489 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 11489 used for?

Port 11489 is assigned by IANA to asgcypresstcps (ASG Cypress Secure Only).

Is port 11489 TCP or UDP?

Port 11489 is registered for TCP.

Is it safe to open port 11489?

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 11489 is open?

On Linux run "ss -ltnup 'sport = :11489'", on macOS "lsof -nP -i :11489", and on Windows "netstat -ano | findstr :11489" to see the local process. From another machine, "nmap -p 11489 <host>" shows whether it is reachable.

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