Mattias Geniar explains all the ways an IP address can be written.
Most of us write our IP addresses the way we've been taught, a long time ago: 127.0.0.1, 10.0.2.1, ... but that gets boring after a while, doesn't it. Luckily, there's a couple of ways to write an IP address, so you can mess with coworkers, clients or use it as a security measure to bypass certain (input) filters.
Read more [ma.ttias.be]
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