List of the top 20 organizations with the largest IP allocations in Sri Lanka
| Rank | Name | IPv4 addresses | IPv6 /64 networks | AS numbers | Prefixes |
|---|---|---|---|---|---|
| Sri Lanka Telecom Ltd | 376,832 | 1.09 x 232 | 4 | 190 | |
| Dialog Axiata Plc | 360,704 | 1.01 x 234 | 1 | 250 | |
| Lanka Education and Research Network | 73,728 | 232 | 1 | 12 | |
| 4 | Mobitel Pvt Ltd | 27,904 | 233 | 1 | 51 |
| 5 | Lanka Communication Services (Pvt) Ltd. | 22,784 | 232 | 1 | 90 |
| 6 | Tata Communications Lanka Ltd | 7,936 | 0 | 1 | 6 |
| 7 | Hutchison Telecommunications Lanka (Private) Limited | 6,400 | 1.44 x 220 | 2 | 48 |
| 8 | Information and Communication Technology Agency of Sri Lanka | 2,304 | 0 | 1 | 3 |
| 9 | COMMERCIAL BANK OF CEYLON PLC | 1,024 | 0 | 1 | 4 |
| 10 | Nations Trust Banks Plc | 512 | 0 | 1 | 2 |
| 11 | OREL I T Private Limited | 512 | 0 | 2 | 2 |
| 12 | Tekki Pvt Ltd | 512 | 0 | 1 | 2 |
| 13 | Innodata-Isogen India Pvt Ltd | 256 | 0 | 1 | 1 |
| 14 | Bank Of Ceylon | 256 | 0 | 1 | 1 |
| 15 | Hatton National Bank PLC | 256 | 0 | 1 | 1 |
| 16 | CEYLON ELECTRICITY BOARD | 256 | 0 | 1 | 1 |
| 17 | LankaPay Pvt Ltd | 256 | 0 | 1 | 1 |
| 18 | Rishikeshan Lavakumar | 0 | 1.25 x 218 | 1 | 2 |