Interchangeably in informal speech. But if you’re composing in a formal location, you need to know the main difference. The address 127.0.0.1:49342 refers to a local network connection commonly utilized for testing and debugging purposes. The 127.0.0.1 with port 49342 enables developers to run applications locally without external network access. https://www.techypic.com/127-0-0-149342/