| Organization | Blocks | Addresses | First registered |
|---|---|---|---|
| Holosys d.o.o. | 1 | 16.8 million | 4 Oct 2007 |
| Koncar Electronics and Informatics | 1 | 16.8 million | 20 Jun 2013 |
| RIZ TRANSMITTERS | 1 | 16.8 million | 3 Dec 2010 |
| Robotic d.o.o. | 1 | 16.8 million | 1 Mar 2024 |
| Sartura d.o.o. | 1 | 16.8 million | 6 Jan 2015 |
| Telefon-Gradnja d.o.o. | 1 | 16.8 million | 7 Apr 2005 |
| Tri plus grupa d.o.o. | 1 | 16.8 million | 5 Apr 2022 |
| Sprintshield d.o.o. | 2 | 1.1 million | 12 Feb 2020 |
| Eco Mobile | 1 | 1 million | 27 Mar 2019 |
| Eltek brojila d.o.o. | 1 | 1 million | 26 Aug 2020 |
| KONČAR - Electrical Engineering Institute Ltd. | 1 | 1 million | 16 Nov 2024 |
| Stype CS d.o.o. | 1 | 1 million | 5 Jun 2020 |
| Xylon | 3 | 12.3 thousand | 8 Apr 2018 |
| Byte Lab Grupa d.o.o. | 1 | 4.1 thousand | 15 Jul 2022 |
| Dolotron d.o.o. | 1 | 4.1 thousand | 27 Mar 2016 |
| ELMAR electronic | 1 | 4.1 thousand | 30 Jul 2008 |
| Geolux | 1 | 4.1 thousand | 15 Oct 2024 |
| Hijet Print d.o.o. | 1 | 4.1 thousand | 10 Jun 2012 |
| Koncar Electrical Engineering Institute | 1 | 4.1 thousand | 27 Mar 2011 |
| Produkcija studio C.P.G d.o.o. | 1 | 4.1 thousand | 3 Dec 2025 |
| Radikal d.o.o. | 1 | 4.1 thousand | 1 Jul 2019 |
| Smartek d.o.o. | 1 | 4.1 thousand | 30 Jul 2008 |
| Supranet | 1 | 4.1 thousand | 4 Mar 2012 |
Every organization with blocks registered in Croatia, sorted by total address space.