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. | 24,348,928 | 244 | 8 | 699 | |
| Fastweb SpA | 14,971,904 | 1.63 x 235 | 4 | 590 | |
| WIND TRE S.P.A. | 11,697,664 | 1.02 x 241 | 2 | 240 | |
| 4 | Consortium GARR | 2,787,584 | 233 | 1 | 85 |
| 5 | BT Italia S.p.A. | 977,664 | 232 | 1 | 32 |
| 6 | Retelit Digital Services S.p.A. | 956,416 | 1.72 x 237 | 13 | 245 |
| 7 | Sky Italia srl | 594,688 | 1.01 x 239 | 2 | 23 |
| 8 | Smeraldo S.p.A. | 540,736 | 232 | 1 | 21 |
| 9 | EOLO S.p.A. | 525,312 | 235 | 1 | 64 |
| 10 | Fibercop S.p.A. | 478,720 | 1.01 x 235 | 1 | 120 |
| 11 | Aruba S.p.A. | 381,696 | 1.13 x 235 | 7 | 158 |
| 12 | RETELIT-X S.R.L. | 291,584 | 232 | 2 | 20 |
| 13 | TELECOM ITALIA SPARKLE S.p.A. | 291,072 | 233 | 2 | 311 |
| 14 | SKYLOGIC S.P.A. | 224,256 | 233 | 1 | 272 |
| 15 | Opnet Srl | 221,696 | 0 | 1 | 226 |
| 16 | UNIDATA S.p.A. | 216,576 | 233 | 2 | 87 |
| 17 | HERABIT S.p.A. | 193,536 | 232 | 1 | 57 |
| 18 | Open Fiber S.P.A. | 150,528 | 217 | 1 | 362 |
| 19 | REEVO S.P.A. | 145,664 | 1.06 x 236 | 2 | 92 |
| 20 | INTRED S.p.A. | 144,384 | 233 | 2 | 93 |