List of the top 20 organizations with the largest IP allocations in United States
| Rank | Name | IPv4 addresses | IPv6 /64 networks | AS numbers | Prefixes |
|---|---|---|---|---|---|
| Amazon.com, Inc. | 243,124,480 | 1.91 x 241 | 5 | 27,651 | |
| United States Department of Defense (DoD) | 239,040,512 | 1.01 x 232 | 44 | 4,545 | |
| AT&T Enterprises, LLC | 131,968,133 | 1.06 x 241 | 30 | 3,754 | |
| 4 | Verizon Business | 123,970,048 | 1.06 x 241 | 68 | 7,900 |
| 5 | Comcast Cable Communications, LLC | 95,461,376 | 1.2 x 248 | 38 | 7,932 |
| 6 | DoD Network Information Center | 92,540,160 | 1.1 x 233 | 155 | 7,667 |
| 7 | Microsoft Corporation | 83,777,024 | 1.12 x 239 | 14 | 2,274 |
| 8 | Google LLC | 59,489,648 | 1.91 x 236 | 13 | 6,046 |
| 9 | Apple Inc. | 44,956,160 | 1.02 x 234 | 2 | 2,118 |
| 10 | Level 3 Communications, Inc. | 41,326,848 | 1.13 x 237 | 9 | 4,422 |
| 11 | Charter Communications Inc | 39,735,104 | 1.37 x 239 | 15 | 2,736 |
| 12 | Cogent Communications | 37,686,272 | 1.82 x 237 | 3 | 4,735 |
| 13 | CenturyLink Communications, LLC | 36,679,296 | 1.02 x 240 | 29 | 3,138 |
| 14 | Cox Communications Inc. | 25,371,648 | 1.52 x 238 | 1 | 10,845 |
| 15 | Charter Communications | 15,245,824 | 1.01 x 239 | 14 | 5,240 |
| 16 | T-Mobile USA, Inc. | 14,561,280 | 1.13 x 236 | 5 | 630 |
| 17 | University of California, San Diego | 12,859,914 | 1.25 x 232 | 1 | 24 |
| 18 | Windstream Communications LLC | 12,772,864 | 1.47 x 240 | 1 | 3,176 |
| 19 | Cablevision Systems Corp. | 11,046,144 | 1.19 x 237 | 2 | 2,809 |
| 20 | Headquarters, USAISC | 9,907,968 | 1.62 x 225 | 63 | 2,012 |