Identify dynamic IP address of network device

I have a automation/security controller which is network enabled. I am able to comunicate with the controller on the internal network via a static IP address. My problem is that I cannot communicate with the device from outside the internal network since I cannot determine the dynamic IP address of the device.

The device does not have any browser capability for me to access a site like myip.com to determine the dynamic IP address. Nor is there any way to install any type of client software on the device to determine the dynamic IP such as the client software used with a DNS service such as No-IP.

Is there any type of utility software or possible example source code to remotely determine the dynamic IP address of a device? For example, the utility would be installed on my computer and this utility would somehow determine the dynamic IP address of another computer, in this case the controller.

Can't quite see what you're getting at here. You're saying that this controller is "network enabled". Does it to react to DHCP in any way? If yes, then you can tell it what address to use.

As for communicating with it externally, what connects this network to another? If it's a router, then you will most likely have to talk to the router to get to the device as it usually isn't exposed through any other interface. Some routers permit remote configuration, which will allow you to see the address of the device behind the router and then you should be able to set up a port forward.

Generally speaking, it's only really old/crap devices that say "I'm going to use this address" when plugged into a network without telling anyone or anything.

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then you will most likely have to talk to the router to get to the device as it usually isn't exposed through any other interface.

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Your comment made me reread the No-Ip instructions. I was incorrectly using the default setup for the dynamic update client which was using the IP address of the computer that the client was installed on. I should have been using the IP address of the router with port forwarding enabled.

I made the assumption that the dynamic update client would have to be installed on the controller which is impossible. Thus, the reason for my somewhat nonunderstandable question.

I am now able to access the controller with the client using the routers IP address.

Thanx
Bob