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. | 24,922,880 | 244 | 7 | 839 | |
| WIND TRE S.P.A. | 9,198,336 | 1.02 x 241 | 2 | 163 | |
| Vodafone Italia S.p.A. | 7,810,560 | 1.5 x 233 | 3 | 465 | |
| 4 | Fastweb SpA | 7,372,544 | 236 | 1 | 123 |
| 5 | Consortium GARR | 2,787,584 | 233 | 1 | 85 |
| 6 | BT Italia S.p.A. | 1,276,928 | 233 | 3 | 62 |
| 7 | IRIDEOS S.P.A. | 804,352 | 1.5 x 235 | 6 | 112 |
| 8 | Tiscali Italia S.P.A. | 689,601 | 232 | 1 | 32 |
| 9 | Sky Italia srl | 660,480 | 1.01 x 239 | 2 | 23 |
| 10 | EOLO S.p.A. | 402,432 | 235 | 1 | 28 |
| 11 | Aruba S.p.A. | 339,968 | 1.16 x 235 | 5 | 125 |
| 12 | Linkem spa | 337,664 | 232 | 1 | 247 |
| 13 | Acantho S.p.a | 211,968 | 233 | 2 | 66 |
| 14 | Fiat Information Technology, Excellence and Methods S.p.A. | 203,008 | 0 | 2 | 10 |
| 15 | SKYLOGIC S.P.A. | 198,400 | 233 | 1 | 204 |
| 16 | ITnet S.r.l. | 198,144 | 232 | 1 | 64 |
| 17 | ENI S.p.A. | 196,608 | 0 | 1 | 4 |
| 18 | ENEL S.p.A | 192,000 | 0 | 2 | 39 |
| 19 | Leonardo S.p.A. | 137,984 | 0 | 2 | 20 |
| 20 | INTRED S.P.A. | 136,704 | 233 | 2 | 63 |