None of the Creative Commons licenses require contacting the author as a requirement. You will have to look for another license, or create your own.
Creating your own license is not recommended for many reasons, one of which is that, unless you are a copyright lawyer, you will most likely run into problems and create a license that doesn't do exactly what you want. For example, what happens when you get hit by a bus - does the requirement effectively turn the project into a proprietary one? Or does a "good faith" attempt at contacting you suffice? All things that need to be clarified in legal language.
One thing's certain if you create your own license: you cannot call it a Creative Commons license:
Can I change the license terms or conditions?
Yes—but if you change the terms and conditions of any Creative Commons license, you must no longer call, label, or describe the license as a “Creative Commons” or “CC” license, nor can you use the Creative Commons logos, buttons, or other trademarks in connection with the modified license or your materials. ...
You'll find that most licenses are like that; if you modify them by placing additional restrictions, you can no longer call it by the same name. This is to protect the integrity of those licenses.
Your other option is to look for an existing license that has that pingback requirement. The only such one I'm aware of is the Reciprocal Public License. Instead of requiring a pingback, it does require anyone to publish their extensions, regardless of whether their project is publicly deployed. Even such a requirement is unusual and controversial: RPL is OSI-approved but not an FSF-approved license.
Instead of using a custom license, I would recommend that you give your project a unique name and use a license that requires attribution. That way you can find notable users of your project by searching for them.
Finally, watch out for the license of the open source system that your project is based on. If it is copyleft, chances are it will be incompatible with whatever "pingback" license you choose.