It's a common question, especially when you are considering how to trace a cell phone number, and the best way is to know exactly how much are credit card numbers on the dark web. It may sound obvious but it needs to be stated - not all websites that offer this service are legitimate, or even ethical. There are many who use this service for malicious reasons such as phishing, fraud, and identity theft. This is why it's important to check the authenticity of any website before you provide any personal information online.