Did you cut and paste the entire lot ? Either chop of __END__ onwards or add last if /END/; in the second while loop, say just before the chomp though I don't think this is your problem, error would be different. Else did you find some values of IP address or ranges that gave this result, the posted code runs fine for me but I am on perl 5.005_3 so perhaps something in a more modern perl makes it barf, if so I'd love to see ?
Cheers,
R.
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