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. | 243,134,464 | 1.93 x 241 | 5 | 26,101 | |
| United States Department of Defense (DoD) | 239,366,912 | 1.01 x 232 | 45 | 4,550 | |
| AT&T Enterprises, LLC | 131,968,517 | 1.06 x 241 | 30 | 3,748 | |
| 4 | Verizon Business | 124,260,352 | 1.06 x 241 | 70 | 7,975 |
| 5 | DoD Network Information Center | 95,629,824 | 1.1 x 233 | 182 | 9,350 |
| 6 | Comcast Cable Communications, LLC | 95,468,800 | 1.2 x 248 | 38 | 7,940 |
| 7 | Microsoft Corporation | 83,801,088 | 1.12 x 239 | 14 | 2,337 |
| 8 | Google LLC | 59,779,744 | 1.47 x 236 | 12 | 6,156 |
| 9 | Apple Inc. | 45,025,536 | 1.02 x 234 | 2 | 2,155 |
| 10 | Level 3 Communications, Inc. | 41,431,264 | 1.13 x 237 | 9 | 4,476 |
| 11 | Charter Communications Inc | 39,379,008 | 1.37 x 239 | 15 | 2,709 |
| 12 | Cogent Communications | 37,866,496 | 1.82 x 237 | 3 | 4,862 |
| 13 | CenturyLink Communications, LLC | 36,670,080 | 1.02 x 240 | 28 | 3,201 |
| 14 | Cox Communications Inc. | 25,843,456 | 1.52 x 238 | 1 | 10,909 |
| 15 | Charter Communications | 15,329,536 | 1.01 x 239 | 14 | 5,294 |
| 16 | T-Mobile USA, Inc. | 14,562,304 | 1.13 x 236 | 5 | 636 |
| 17 | Windstream Communications LLC | 12,869,888 | 1.47 x 240 | 1 | 3,301 |
| 18 | University of California, San Diego | 12,859,914 | 1.25 x 232 | 1 | 24 |
| 19 | Headquarters, USAISC | 11,388,160 | 1.65 x 225 | 63 | 3,028 |
| 20 | Cablevision Systems Corp. | 10,997,760 | 1.19 x 237 | 2 | 2,758 |