This article is a summary of Tier 1 Internet service providers across the world. This page follows the traditional definition of a tier 1, that is an ISP that is settlement free across the entire internet.

The following are Tier 1 ISPs (in alphabetical order): A Tier 1 carrier is a telco or ISP that is at the top of the telecommunications peering and settlements food chain. ...

• American Telephone and Telegraph (AT&T)
• Global Crossing
• Level(3) Communications, LLC
• UUNET (MCI)
• Nippon Telegraph and Telephone (NTT) / Verio
• Qwest
• Savvis Communications Corporation (formerly Cable and Wireless America)
• Sprint

See Tier 1 carrier for more information. Global Crossing Ltd. ... UUNET Technologies Logo Post-WorldCom UUNET Logo UUNET is one of the industrys oldest and largest Internet Service Providers. ... Jump to: navigation, search MCI, Inc. ... Jump to: navigation, search This article contains nonstandard pronunciation information which should be rewritten using the International Phonetic Alphabet. ... SAVVIS Communications Corporation is a telecommunications company. ... Cable and Wireless (NYSE: CWP) (LSE: CW.) is a British telecommunications company. ... Jump to: navigation, search Sprint Nextel Corporation NYSE: S, headquartered in Reston, Virginia, is one of the largest telecommunications companies in the United States. ... Jump to: navigation, search This article needs to be cleaned up to conform to a higher standard of quality. ...