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. | 24,885,760 | 244 | 7 | 709 | |
| WIND TRE S.P.A. | 11,192,320 | 1.02 x 241 | 2 | 210 | |
| Vodafone Italia S.p.A. | 7,754,240 | 1.5 x 233 | 3 | 466 | |
| 4 | Fastweb SpA | 7,367,424 | 236 | 1 | 117 |
| 5 | Consortium GARR | 2,787,584 | 233 | 1 | 85 |
| 6 | BT Italia S.p.A. | 1,273,152 | 233 | 3 | 61 |
| 7 | Retelit Digital Services S.p.A. | 918,784 | 1.69 x 237 | 7 | 201 |
| 8 | Sky Italia srl | 659,968 | 1.01 x 239 | 2 | 22 |
| 9 | Tiscali Italia S.P.A. | 541,760 | 232 | 1 | 22 |
| 10 | EOLO S.p.A. | 517,120 | 235 | 1 | 64 |
| 11 | Opnet Srl | 348,416 | 232 | 1 | 285 |
| 12 | Aruba S.p.A. | 345,088 | 1.05 x 235 | 4 | 151 |
| 13 | SKYLOGIC S.P.A. | 227,072 | 233 | 1 | 272 |
| 14 | ENI S.p.A. | 196,608 | 0 | 1 | 4 |
| 15 | HERABIT S.p.A. | 192,768 | 232 | 1 | 56 |
| 16 | TELECOM ITALIA SPARKLE S.p.A. | 167,680 | 233 | 2 | 268 |
| 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. | 137,984 | 0 | 2 | 19 |
| 20 | TWT S.p.A. | 121,344 | 232 | 1 | 63 |