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. | 24,953,856 | 244 | 7 | 714 | |
| RIPE Network Coordination Centre | 8,954,880 | 1.02 x 241 | 1 | 177 | |
| Vodafone Italia S.p.A. | 7,815,680 | 1.5 x 233 | 3 | 465 | |
| 4 | Fastweb SpA | 7,366,912 | 236 | 1 | 115 |
| 5 | Consortium GARR | 2,787,584 | 233 | 1 | 85 |
| 6 | BT Italia S.p.A. | 1,273,600 | 233 | 3 | 65 |
| 7 | WIND TRE S.P.A. | 926,720 | 0 | 1 | 15 |
| 8 | Retelit Digital Services S.p.A. | 920,064 | 1.94 x 237 | 6 | 202 |
| 9 | Sky Italia srl | 660,480 | 1.01 x 239 | 2 | 24 |
| 10 | Tiscali Italia S.P.A. | 541,760 | 232 | 1 | 22 |
| 11 | EOLO S.p.A. | 508,928 | 235 | 1 | 60 |
| 12 | Opnet Srl | 351,232 | 232 | 1 | 286 |
| 13 | Aruba S.p.A. | 345,088 | 1.29 x 235 | 4 | 132 |
| 14 | SKYLOGIC S.P.A. | 223,488 | 233 | 1 | 259 |
| 15 | Acantho S.p.a | 201,216 | 232 | 3 | 62 |
| 16 | ENI S.p.A. | 196,608 | 0 | 1 | 4 |
| 17 | TELECOM ITALIA SPARKLE S.p.A. | 170,752 | 233 | 2 | 271 |
| 18 | REEVO S.P.A. | 144,384 | 1.06 x 236 | 2 | 90 |
| 19 | INTRED S.P.A. | 142,848 | 233 | 2 | 87 |
| 20 | Leonardo S.p.A. | 137,984 | 0 | 2 | 19 |