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If you've ever worked with phone numbers in an application, you've probably noticed something interesting. A phone number looks like a simple string of digits. But those digits contain structure. Take
Have you ever come across an unfamiliar IP address in your website logs or received a security alert showing one? It's natural to wonder where that connection came from and whether it's something you
Every developer knows the feeling. You build a great web app. You finally launch it. You get excited to see new users registering. Then, you check your database. Half of the new signups look like test
