Net Police

Net Police (, Netto Porisu) is a cyber police force.

Yorknew City arc
In a conversation between Killua and his older brother Milluki about how to obtain information the Greed Island game, the brother suggests the Hunter Association website. It's claimed by Milluki that he could hack the website for information on the game, however, that would mean having the Net Police and Hacker Hunters on his tail.