.to is the Internet country code top-level domain (ccTLD) of the island kingdom of Tonga.
The government of Tonga sells domains in its ccTLD to any interested party. Because to is a useful English preposition, it became popular to craft memorable URLs taking advantage of this, such as (bogus example) http://look.to/wikipedia or Refused's http://page.to/come.
The .to ccTLD is administered by the Tonga Network Information Center (Tonic).
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