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 | 1,447,680 | 0 | 2 | 221 | |
| Eircom Limited | 1,111,040 | 235 | 1 | 29 | |
| 4 | Amazon Data Services Ireland Ltd | 1,005,568 | 1.62 x 230 | 1 | 172 |
| 5 | BT Communications Ireland Limited | 438,016 | 1.13 x 235 | 2 | 16 |
| 6 | Three Ireland (Hutchison) limited | 250,112 | 0 | 1 | 103 |
| 7 | Digiweb ltd | 248,064 | 1.63 x 235 | 2 | 64 |
| 8 | Imagine Communications Group Limited | 167,680 | 232 | 1 | 34 |
| 9 | Coolwave Communications Limited | 156,160 | 0 | 1 | 5 |
| 10 | Magnet Networks Limited | 123,392 | 1.25 x 235 | 2 | 26 |
| 11 | University College Dublin | 77,824 | 216 | 1 | 4 |
| 12 | Fulnett Limited | 42,240 | 232 | 1 | 9 |
| 13 | Blacknight Internet Solutions Limited | 34,560 | 1.88 x 235 | 3 | 43 |
| 14 | Google Cloud EMEA Ltd | 32,768 | 229 | 2 | 4 |
| 15 | ServeCentric Ltd. | 32,768 | 0 | 1 | 1 |
| 16 | Enet Telecommunications Networks Limited | 27,136 | 1.03 x 235 | 1 | 52 |
| 17 | Irish Government | 26,624 | 232 | 2 | 25 |
| 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 | 2 | 166 |