13 Feet Ladder
github.com
A site similar to 12ft.io but is self hosted and works with websites that 12ft.io doesn't work with.
How does it work?
It pretends to be GoogleBot (Google's web crawler) and gets the same content that google will get. Google gets the whole page so that the content of the article can be indexed properly and this takes advantage of that.
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It amazes me that all it takes is just changing user agent to
Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/W.X.Y.Z Mobile Safari/537.36 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)and it can bypass paywalls on many sites? I thought those sites would try harder (e.g. checking if the ip address is truly belong to google), but apparently not.Checking ip ownership is a moving target more likely to result in outcomes these sites don’t want (accidentally blocking google bots and preventing results from appearing on google).
Checking useragent is cheap, easier, unlikely to break (for this purpose, anyway) and the percentage of folks who know how to bypass this check is relatively slim, with a pretty small financial impact.
It's not necessarily a moving target when entire blocks can be associated with Google.
Unless they are permanently only using specific addresses or blocks and will never change that up, I’d consider it a moving target.
Google literally has an official list of IP ranges for their crawlers, complete with an API that returns the current IP ranges that you can use to automate a check. Hardly a moving target, and even if it is, it doesn't matter if you know exactly where the target is at all times.