List of the top 20 organizations with the largest IP allocations in Ireland
| Rank | Name | IPv4 addresses | IPv6 /64 networks | AS numbers | Prefixes |
|---|---|---|---|---|---|
| HEAnet CLG | 1,843,200 | 232 | 1 | 18 | |
| Vodafone Ireland Limited | 1,445,120 | 0 | 2 | 224 | |
| Amazon Data Services Ireland Ltd | 1,138,944 | 1.69 x 230 | 1 | 199 | |
| 4 | Eircom Limited | 1,111,040 | 235 | 1 | 29 |
| 5 | BT Communications Ireland Limited | 439,040 | 1.13 x 235 | 2 | 17 |
| 6 | Digiweb ltd | 244,992 | 1.63 x 235 | 2 | 64 |
| 7 | Three Ireland (Hutchison) limited | 241,920 | 0 | 1 | 70 |
| 8 | Imagine Communications Group Limited | 151,296 | 232 | 1 | 26 |
| 9 | Magnet Networks Limited | 123,136 | 1.25 x 235 | 2 | 25 |
| 10 | University College Dublin | 65,536 | 0 | 1 | 1 |
| 11 | Fulnett Limited | 45,056 | 232 | 1 | 10 |
| 12 | Blacknight Internet Solutions Limited | 35,072 | 1.88 x 235 | 3 | 45 |
| 13 | Google Cloud EMEA Ltd | 32,768 | 229 | 2 | 4 |
| 14 | ServeCentric Ltd. | 32,768 | 0 | 1 | 1 |
| 15 | Enet Telecommunications Networks Limited | 27,136 | 1.03 x 235 | 1 | 52 |
| 16 | Irish Government | 26,624 | 232 | 2 | 25 |
| 17 | Coolwave Communications Limited | 25,088 | 0 | 1 | 4 |
| 18 | Meteor Mobile Communications Limited | 24,832 | 232 | 1 | 8 |
| 19 | Google Ireland Limited | 21,760 | 224 | 1 | 7 |
| 20 | Afilias Ltd | 21,248 | 1.3 x 222 | 1 | 166 |