Private company

McColo

Defunct web hosting provider used for cybercrime

McColo was a US-based web hosting service provider that was, for a long time, the source of the majority of spam-sending activities for the entire world. In late 2008, the company was shut down by two upstream providers, Global Crossing and Hurricane Electric, because a significant amount of malware and botnets had been trafficking from the McColo servers.2 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

  • Industryweb hosting service1
  • HeadquartersSan Jose1
  • Legal formcompany1

McColo was a US-based web hosting service provider that was, for a long time, the source of the majority of spam-sending activities for the entire world. In late 2008, the company was shut down by two upstream providers, Global Crossing and Hurricane Electric, because a significant amount of malware and botnets had been trafficking from the McColo servers.2

The story

McColo was formed by a 19-year-old Russian hacker and student named Nikolai. Nikolai's nickname was "Kolya McColo"; hence the name of the provider.

From Wikipedia’s article on McColo, shared under CC BY-SA 4.0.3

Sources

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