If you are on a *nix box, you can profit from xargs: 
xargs -n5 tool.pl < hosts.txt

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لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: split on every n lines by choroba
in thread split on every n lines by sunil9009

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