List of the top 20 organizations with the largest IP allocations in Austria
| Rank | Name | IPv4 addresses | IPv6 /64 networks | AS numbers | Prefixes |
|---|---|---|---|---|---|
| A1 Telekom Austria AG | 573,440 | 0 | 1 | 18 | |
| ACONET | 335,360 | 235 | 1 | 19 | |
| LIWEST Kabelmedien GmbH | 254,976 | 232 | 1 | 10 | |
| 4 | Technische Universitat Wien | 132,096 | 0 | 1 | 2 |
| 5 | Video-Broadcast GmbH | 116,736 | 232 | 1 | 8 |
| 6 | Vienna University Computer Center | 99,584 | 0 | 1 | 7 |
| 7 | APA-IT Informations Technologie G.m.b.H | 98,816 | 235 | 1 | 59 |
| 8 | Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH | 92,960 | 1.81 x 237 | 4 | 93 |
| 9 | Russmedia IT GmbH | 83,456 | 233 | 1 | 75 |
| 10 | Magistrat der Stadt Wien, Magistratsabteilung 01 | 69,632 | 216 | 1 | 3 |
| 11 | University Linz | 67,584 | 216 | 1 | 4 |
| 12 | WU (Wirtschaftsuniversitaet Wien) - Vienna University of Economics and Business | 65,536 | 0 | 1 | 1 |
| 13 | University of Innsbruck | 65,536 | 0 | 1 | 1 |
| 14 | Universitaet Klagenfurt | 65,536 | 0 | 1 | 1 |
| 15 | Technische Universitaet Graz | 65,536 | 0 | 1 | 1 |
| 16 | JOANNEUM RESEARCH | 65,536 | 0 | 1 | 1 |
| 17 | MUWNET Autonomous System | 65,536 | 216 | 1 | 2 |
| 18 | Universitaet Graz | 65,536 | 0 | 1 | 1 |
| 19 | Universitaet Salzburg | 65,536 | 0 | 1 | 1 |
| 20 | Parlamentsdirektion | 65,536 | 232 | 1 | 2 |