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. | 242,080,768 | 1.93 x 241 | 5 | 26,582 | |
| United States Department of Defense (DoD) | 238,497,792 | 1.01 x 232 | 44 | 4,529 | |
| AT&T Enterprises, LLC | 131,904,261 | 1.05 x 241 | 30 | 3,741 | |
| 4 | Verizon Business | 123,902,976 | 1.06 x 241 | 69 | 7,802 |
| 5 | Comcast Cable Communications, LLC | 95,456,512 | 1.2 x 248 | 38 | 7,898 |
| 6 | DoD Network Information Center | 92,258,560 | 1.1 x 233 | 155 | 7,644 |
| 7 | Microsoft Corporation | 83,790,848 | 1.12 x 239 | 14 | 2,309 |
| 8 | Google LLC | 59,569,008 | 1.4 x 236 | 14 | 6,026 |
| 9 | Apple Inc. | 44,880,640 | 1.02 x 234 | 2 | 2,116 |
| 10 | Level 3 Communications, Inc. | 41,395,552 | 1.13 x 237 | 9 | 4,426 |
| 11 | Charter Communications Inc | 39,651,648 | 1.37 x 239 | 15 | 2,722 |
| 12 | Cogent Communications | 37,731,840 | 1.82 x 237 | 3 | 4,526 |
| 13 | CenturyLink Communications, LLC | 36,298,624 | 1.02 x 240 | 28 | 3,039 |
| 14 | Cox Communications Inc. | 26,014,720 | 1.52 x 238 | 1 | 10,893 |
| 15 | Charter Communications | 15,198,208 | 1.01 x 239 | 14 | 5,233 |
| 16 | T-Mobile USA, Inc. | 14,365,440 | 1.13 x 236 | 5 | 632 |
| 17 | University of California, San Diego | 12,859,914 | 1.25 x 232 | 1 | 24 |
| 18 | Windstream Communications LLC | 12,564,480 | 1.47 x 240 | 1 | 3,222 |
| 19 | Cablevision Systems Corp. | 11,020,032 | 1.19 x 237 | 2 | 2,779 |
| 20 | Headquarters, USAISC | 9,896,960 | 1.62 x 225 | 63 | 1,973 |