Nephthys has its own ban list. It can be as huge as you want. Although every ban list entry more will take more cpu power on player joins (to look through and be sure the player isn't banned). Ban lists with about 300 entries shouldn't be a problem on average machines though.
However, you don't need to block 56 contiguous blocks. If you are *sure* the range to ban is contiguous then make the range as large as you are convinced to. Even 0.0.0.0 ... 127.255.255.255 will work with Nephthys (although I think this makes your server empty
). Nephthys also can handle "odd" ranges like 4.200.143.28 ... 4.201.15.123 (although this isn't a reasonable range).
What I wanted to say is: If your block is larger than 65536 entries (i.e. one or both of the first 2 numbers vary) you should take a closer look because you might accidentally block innocent players (which you like to have as guests at your server). With my experience most blocks are even smaller than 65536 entries (every rule has its exception though).
Zora