List of the top 20 organizations with the largest IP allocations in United States
| Rank | Name | IPv4 addresses | IPv6 /64 networks | AS numbers | Prefixes |
|---|---|---|---|---|---|
| United States Department of Defense (DoD) | 239,244,288 | 1.01 x 232 | 42 | 4,538 | |
| Amazon.com, Inc. | 234,388,992 | 1.93 x 241 | 5 | 23,556 | |
| AT&T Enterprises, LLC | 129,155,077 | 1.06 x 241 | 31 | 3,767 | |
| 4 | Verizon Business | 110,603,776 | 1.03 x 241 | 64 | 6,673 |
| 5 | Comcast Cable Communications, LLC | 95,445,248 | 1.2 x 248 | 38 | 8,048 |
| 6 | DoD Network Information Center | 93,912,832 | 1.1 x 233 | 155 | 8,368 |
| 7 | Microsoft Corporation | 83,770,880 | 1.12 x 239 | 14 | 2,239 |
| 8 | Google LLC | 57,439,600 | 1.23 x 237 | 14 | 5,951 |
| 9 | Apple Inc. | 44,793,088 | 1.02 x 234 | 2 | 2,086 |
| 10 | Level 3 Communications, Inc. | 40,807,104 | 1.13 x 237 | 9 | 4,333 |
| 11 | Charter Communications Inc | 39,501,376 | 1.37 x 239 | 15 | 2,714 |
| 12 | Cogent Communications | 37,704,192 | 1.82 x 237 | 2 | 4,815 |
| 13 | CenturyLink Communications, LLC | 36,688,000 | 1.02 x 240 | 29 | 3,162 |
| 14 | Cox Communications Inc. | 25,075,712 | 1.53 x 238 | 1 | 10,773 |
| 15 | Charter Communications | 15,069,184 | 1.01 x 239 | 14 | 5,119 |
| 16 | T-Mobile USA, Inc. | 14,564,352 | 1.13 x 236 | 5 | 633 |
| 17 | Frontier Communications of America, Inc. | 13,737,728 | 1.06 x 236 | 5 | 1,507 |
| 18 | University of California, San Diego | 12,859,914 | 1.25 x 232 | 1 | 24 |
| 19 | Windstream Communications LLC | 12,407,552 | 1.25 x 241 | 1 | 3,098 |
| 20 | Cablevision Systems Corp. | 11,012,864 | 1.19 x 237 | 2 | 2,793 |