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. | 23,835,136 | 244 | 8 | 721 | |
| Fastweb SpA | 14,971,904 | 1.63 x 235 | 4 | 590 | |
| WIND TRE S.P.A. | 11,711,488 | 1.02 x 241 | 2 | 238 | |
| 4 | Consortium GARR | 2,787,584 | 233 | 1 | 85 |
| 5 | BT Italia S.p.A. | 980,608 | 232 | 1 | 41 |
| 6 | Retelit Digital Services S.p.A. | 955,904 | 1.72 x 237 | 13 | 243 |
| 7 | Sky Italia srl | 594,688 | 1.01 x 239 | 2 | 23 |
| 8 | Tiscali Italia S.P.A. | 540,736 | 232 | 1 | 21 |
| 9 | EOLO S.p.A. | 525,312 | 235 | 1 | 64 |
| 10 | Aruba S.p.A. | 381,696 | 1.13 x 235 | 7 | 158 |
| 11 | Fibercop S.p.A. | 329,216 | 1.01 x 235 | 1 | 33 |
| 12 | RETELIT-X S.R.L. | 291,840 | 232 | 2 | 22 |
| 13 | TELECOM ITALIA SPARKLE S.p.A. | 288,000 | 233 | 2 | 306 |
| 14 | SKYLOGIC S.P.A. | 223,488 | 233 | 1 | 269 |
| 15 | UNIDATA S.p.A. | 216,064 | 233 | 2 | 86 |
| 16 | Opnet Srl | 197,888 | 0 | 1 | 196 |
| 17 | HERABIT S.p.A. | 193,536 | 232 | 1 | 57 |
| 18 | Open Fiber S.P.A. | 145,920 | 217 | 1 | 344 |
| 19 | REEVO S.P.A. | 145,152 | 1.06 x 236 | 2 | 90 |
| 20 | INTRED S.p.A. | 144,384 | 233 | 2 | 93 |