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I have a software that is very WAN IP Address sensitive, and I am looking for some "monitors" which can detect if WAN changed by ISP, just to react accordingly.

Any good recommendation?

Edit: I would like to restart my software, if the WAN IP does changed. Or at least some feedback or alert.

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    What needs to happen if it does change? Most modern routers allow for use of a dynamic update service like no-ip.com. The only way to "detect" it is to have a script running locally query a service like whatismyip.com and compare to the last query. (Be sure to stay within the TOS and only check a few times per hour) Maybe you can edit in more about your actual need for better advice. – Tyson Aug 23 '15 at 4:41
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    possible duplicate of Simplest way to check for dynamic IP change – Arjan Aug 23 '15 at 7:56

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