I don't know if this applies to all IPs, or just IPv6 pool IPs, but the reverse DNS manager pretty much doesn't sort them. If you have a lot, like I do (because I'm a dumbass), it gets a bit hard to read when "103" is at the top of the list, followed by "104", but "102", "101" and "100" are at the bottom in reverse order.

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Matt Nordhoff (aka Peng on IRC)