Not everyone needs a static IP address, but knowing how they differ from dynamic IP addresses can help you understand whether you should use a static IP address. Here are some example situations for when you might need a static IP address:. The terms were mentioned only briefly above, and that's because they're pretty simple to understand. At the core, the only real change you'll notice between static vs dynamic IP addresses is that the former never changes, while the latter does. Most people don't really care if their IP address changes.