It's a real shame we can't use the IP range calculator unless we perform a check beforehand, so I'd love to have it changed.
Topic on Talk:Requests for comment/CheckUser requirements
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@Ле Лой There's NativeForeigner's calculator which you can use.[http://www.nativeforeigner.com/calc/]
And on en.wiki, https://en.wikipedia.org/wiki/Template:IP_range_calculator ~~~~
Thanks, I know, but after you get used to this one you open it semi-autmoatically even for non-CU-related things :D
@Ле Лой The IP range calculator can be used just accessing Special:CheckUser. If it does not show, some JS might be hidding it.