List of the top 20 organizations with the largest IP allocations in Tanzania
| Rank | Name | IPv4 addresses | IPv6 /64 networks | AS numbers | Prefixes |
|---|---|---|---|---|---|
| Airtel Tanzania | 1,603,072 | 0 | 1 | 73 | |
| MIC TANZANIA LTD | 141,312 | 0 | 1 | 25 | |
| TANZANIA TELECOMMUNICATIONS CO. LTD | 137,216 | 216 | 1 | 81 | |
| 4 | Simbanet (T) Limited | 115,456 | 1.5 x 233 | 2 | 89 |
| 5 | Vodacom Tanzania Ltd | 67,584 | 0 | 1 | 6 |
| 6 | Zanzibar Telecom(Zantel) | 32,512 | 232 | 1 | 11 |
| 7 | Aptus Solutions Ltd | 26,624 | 232 | 1 | 34 |
| 8 | Viettel Tanzania PLC | 23,808 | 0 | 1 | 27 |
| 9 | 20,992 | 0 | 5 | 12 | |
| 10 | Cats-Net Limited | 20,480 | 232 | 1 | 18 |
| 11 | Milan Cable | 17,152 | 0 | 1 | 28 |
| 12 | Habari Node Public Limited | 15,360 | 232 | 1 | 30 |
| 13 | WIA Tanzania | 12,288 | 232 | 1 | 3 |
| 14 | University of Dar es Salaam | 12,288 | 0 | 1 | 3 |
| 15 | Bell Communications Ltd | 12,288 | 232 | 1 | 31 |
| 16 | Africa Online (T) Ltd | 9,216 | 0 | 1 | 4 |
| 17 | Tanzania Education And Research Network | 8,192 | 0 | 1 | 25 |
| 18 | Tanzania e-Government Agency | 7,424 | 1.25 x 232 | 1 | 11 |
| 19 | CSS-net | 6,144 | 232 | 1 | 15 |
| 20 | Maas Computers and Networks Ltd | 6,144 | 0 | 1 | 14 |