Main Page | See live article | Alphabetical index The following are Tier 1 ISPs: UUNET (owned by Worldcom, doing business as MCI) Sprint AT&T BBN/Genuity Level 3 Cable & Wireless Qwest NTT/Verio Telstra Optus Connect Internet Solutions British Telecom (BT) Global Crossing Williams Communications This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.