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. | 242,299,648 | 1.93 x 241 | 5 | 24,485 | |
| United States Department of Defense (DoD) | 238,914,048 | 1.01 x 232 | 43 | 4,530 | |
| AT&T Enterprises, LLC | 131,901,445 | 1.06 x 241 | 31 | 3,756 | |
| 4 | Verizon Business | 123,894,528 | 1.06 x 241 | 68 | 7,858 |
| 5 | Comcast Cable Communications, LLC | 95,462,400 | 1.2 x 248 | 38 | 8,015 |
| 6 | DoD Network Information Center | 92,511,744 | 1.11 x 233 | 155 | 7,638 |
| 7 | Microsoft Corporation | 83,769,344 | 1.12 x 239 | 14 | 2,246 |
| 8 | Google LLC | 57,327,984 | 1.23 x 237 | 14 | 5,936 |
| 9 | Apple Inc. | 44,789,504 | 1.02 x 234 | 2 | 2,105 |
| 10 | Level 3 Communications, Inc. | 41,321,664 | 1.14 x 237 | 9 | 4,419 |
| 11 | Charter Communications Inc | 39,263,808 | 1.37 x 239 | 15 | 2,684 |
| 12 | Cogent Communications | 37,599,488 | 1.82 x 237 | 2 | 4,529 |
| 13 | CenturyLink Communications, LLC | 36,674,432 | 1.02 x 240 | 29 | 3,120 |
| 14 | Cox Communications Inc. | 25,304,064 | 1.52 x 238 | 1 | 10,839 |
| 15 | Charter Communications | 15,235,328 | 1.01 x 239 | 14 | 5,180 |
| 16 | T-Mobile USA, Inc. | 14,563,840 | 1.13 x 236 | 5 | 631 |
| 17 | University of California, San Diego | 12,859,914 | 1.25 x 232 | 1 | 24 |
| 18 | Windstream Communications LLC | 12,581,888 | 1.11 x 241 | 1 | 3,155 |
| 19 | Cablevision Systems Corp. | 11,022,080 | 1.19 x 237 | 2 | 2,791 |
| 20 | Headquarters, USAISC | 9,783,552 | 1.61 x 225 | 63 | 1,923 |