List of the top 20 organizations with the largest IP allocations in Italy
| Rank | Name | IPv4 addresses | IPv6 /64 networks | AS numbers | Prefixes |
|---|---|---|---|---|---|
| Telecom Italia S.p.A. | 24,899,840 | 244 | 7 | 706 | |
| WIND TRE S.P.A. | 11,454,720 | 1.02 x 241 | 2 | 223 | |
| Vodafone Italia S.p.A. | 7,760,896 | 1.5 x 233 | 3 | 469 | |
| 4 | Fastweb SpA | 7,367,168 | 236 | 1 | 116 |
| 5 | Consortium GARR | 2,787,584 | 233 | 1 | 85 |
| 6 | BT Italia S.p.A. | 1,270,592 | 233 | 3 | 58 |
| 7 | Retelit Digital Services S.p.A. | 965,632 | 1.72 x 237 | 11 | 230 |
| 8 | Sky Italia srl | 659,968 | 1.01 x 239 | 2 | 23 |
| 9 | Tiscali Italia S.P.A. | 541,760 | 232 | 1 | 22 |
| 10 | EOLO S.p.A. | 402,432 | 235 | 1 | 28 |
| 11 | Aruba S.p.A. | 366,592 | 1.01 x 235 | 6 | 143 |
| 12 | Opnet Srl | 307,968 | 232 | 1 | 250 |
| 13 | TELECOM ITALIA SPARKLE S.p.A. | 300,288 | 233 | 2 | 309 |
| 14 | SKYLOGIC S.P.A. | 226,048 | 233 | 1 | 268 |
| 15 | ENI S.p.A. | 196,608 | 0 | 1 | 4 |
| 16 | HERABIT S.p.A. | 193,792 | 232 | 1 | 58 |
| 17 | REEVO S.P.A. | 144,384 | 1.06 x 236 | 2 | 90 |
| 18 | INTRED S.P.A. | 143,104 | 233 | 2 | 88 |
| 19 | Leonardo S.p.A. | 139,008 | 0 | 2 | 20 |
| 20 | TWT S.p.A. | 121,344 | 232 | 1 | 63 |