How are IP ranges calculated?

[jaimeiniesta]

I'm not sure if I understand how IP ranges are expressed, but if I wanted to allow any IP, what IP range would I use? I think it should be:

[
  {{0, 0, 0, 0}, {255, 255, 255, 255}}
]

But when I check with 127.0.0.1 it says it's not whitelisted.

What am I doing wrong here?