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. | 24,916,992 | 244 | 7 | 715 | |
| WIND TRE S.P.A. | 11,425,024 | 1.02 x 241 | 2 | 223 | |
| Fastweb SpA | 8,043,776 | 1.25 x 235 | 3 | 299 | |
| 4 | Vodafone Italia S.p.A. | 7,079,168 | 1.5 x 233 | 1 | 288 |
| 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. | 982,272 | 1.72 x 237 | 12 | 240 |
| 8 | Sky Italia srl | 594,432 | 1.01 x 239 | 2 | 22 |
| 9 | Tiscali Italia S.P.A. | 541,760 | 232 | 1 | 22 |
| 10 | EOLO S.p.A. | 402,432 | 235 | 1 | 28 |
| 11 | Aruba S.p.A. | 382,208 | 1.13 x 235 | 7 | 161 |
| 12 | Opnet Srl | 308,736 | 232 | 1 | 250 |
| 13 | TELECOM ITALIA SPARKLE S.p.A. | 292,352 | 233 | 2 | 294 |
| 14 | SKYLOGIC S.P.A. | 226,816 | 233 | 1 | 269 |
| 15 | UNIDATA S.p.A. | 214,272 | 233 | 2 | 85 |
| 16 | ENI S.p.A. | 196,608 | 0 | 1 | 4 |
| 17 | HERABIT S.p.A. | 193,536 | 232 | 1 | 57 |
| 18 | INTRED S.P.A. | 144,128 | 233 | 2 | 92 |
| 19 | REEVO S.P.A. | 143,872 | 1.06 x 236 | 2 | 91 |
| 20 | Leonardo S.p.A. | 139,008 | 0 | 2 | 20 |