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. | 24,737,536 | 244 | 6 | 708 | |
| WIND TRE S.P.A. | 11,599,360 | 1.02 x 241 | 2 | 236 | |
| Fastweb SpA | 8,015,616 | 1.25 x 235 | 3 | 306 | |
| 4 | Vodafone Italia S.p.A. | 7,095,552 | 1.5 x 233 | 1 | 287 |
| 5 | Consortium GARR | 2,787,584 | 233 | 1 | 85 |
| 6 | BT Italia S.p.A. | 1,272,128 | 233 | 3 | 60 |
| 7 | Retelit Digital Services S.p.A. | 986,880 | 1.72 x 237 | 13 | 246 |
| 8 | Sky Italia srl | 594,688 | 1.01 x 239 | 2 | 23 |
| 9 | Tiscali Italia S.P.A. | 540,736 | 232 | 1 | 21 |
| 10 | EOLO S.p.A. | 525,312 | 235 | 1 | 64 |
| 11 | Aruba S.p.A. | 381,696 | 1.13 x 235 | 7 | 159 |
| 12 | TELECOM ITALIA SPARKLE S.p.A. | 274,688 | 233 | 2 | 288 |
| 13 | SKYLOGIC S.P.A. | 226,304 | 233 | 1 | 280 |
| 14 | Opnet Srl | 216,576 | 232 | 1 | 207 |
| 15 | UNIDATA S.p.A. | 216,064 | 233 | 2 | 85 |
| 16 | HERABIT S.p.A. | 193,792 | 232 | 1 | 58 |
| 17 | INTRED S.p.A. | 144,384 | 233 | 2 | 93 |
| 18 | REEVO S.P.A. | 143,872 | 1.06 x 236 | 2 | 91 |
| 19 | Open Fiber S.P.A. | 135,936 | 217 | 1 | 305 |
| 20 | Fibercop S.p.A. | 132,608 | 1.01 x 235 | 1 | 48 |