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. | 24,086,528 | 244 | 7 | 694 | |
| Fastweb SpA | 14,971,904 | 1.63 x 235 | 4 | 590 | |
| WIND TRE S.P.A. | 11,664,896 | 1.02 x 241 | 2 | 239 | |
| 4 | Consortium GARR | 2,787,584 | 233 | 1 | 85 |
| 5 | Retelit Digital Services S.p.A. | 1,024,000 | 1.72 x 237 | 13 | 248 |
| 6 | BT Italia S.p.A. | 980,608 | 232 | 1 | 41 |
| 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 | Fibercop S.p.A. | 413,184 | 1.01 x 235 | 1 | 115 |
| 11 | Aruba S.p.A. | 381,696 | 1.13 x 235 | 7 | 158 |
| 12 | RETELIT-X S.R.L. | 291,840 | 232 | 2 | 22 |
| 13 | TELECOM ITALIA SPARKLE S.p.A. | 291,584 | 233 | 2 | 313 |
| 14 | SKYLOGIC S.P.A. | 224,256 | 233 | 1 | 272 |
| 15 | Opnet Srl | 216,832 | 0 | 1 | 207 |
| 16 | UNIDATA S.p.A. | 216,064 | 233 | 2 | 85 |
| 17 | HERABIT S.p.A. | 193,536 | 232 | 1 | 57 |
| 18 | REEVO S.P.A. | 145,920 | 1.06 x 236 | 2 | 93 |
| 19 | INTRED S.p.A. | 144,384 | 233 | 2 | 93 |
| 20 | Open Fiber S.P.A. | 142,336 | 217 | 1 | 330 |