List of tier 1 internet service providers

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