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ip.renfei.net pairs with DDNS dynamic DNS resolution for resolving dynamic IPs. In a dynamic-IP environment, it conveniently updates domain resolution records in time. On Linux, use curl ip.renfei.net to quickly query the public outbound IP. In a browser, use JavaScript to request ip.renfei.net to get the user's public IP address.
Today I suddenly noticed a spike in my site's traffic, with an extra chunk of referral traffic. Per the traffic stats it came from the classic-cases section of the official REN domain website, where my site sits last under the 'Personal Blog: Programmer Tech Blog' category.
Many friends wonder why I switched domains again. Although switching hurts a site a lot, when I come across a desirable domain I can't resist switching. What's the story behind the newly adopted [renfei.net]? I was curious too, so I looked up the history of the domains I care about.
After the computer gets the domain name the user typed in, it queries a server — the DNS server set in our computer. DNS stands for Domain Name System, and every ISP provides a DNS server for users to resolve domain names. This article doesn't cover DNS principles, only the resolution process, so let's go straight to it.
