| Organization | Blocks | Addresses | First registered |
|---|---|---|---|
| Altice Labs | 5 | 83.9 million | 5 Dec 2020 |
| Tech4home, Lda | 3 | 50.3 million | 15 Jul 2020 |
| EID | 2 | 16.8 million | 30 Jul 2008 |
| A Beltrónica-Companhia de Comunicações, Lda | 1 | 16.8 million | 21 Jul 2005 |
| Biodevices, SA | 1 | 16.8 million | 19 Oct 2008 |
| EDP Servicos | 1 | 16.8 million | 8 Aug 2013 |
| ENT-EMPRESA NACIONAL DE TELECOMMUNICACOES, S.A. | 1 | 16.8 million | 8 Sep 2000 |
| GLINTT TES S.A. | 1 | 16.8 million | 31 Aug 2012 |
| Global Fire Equipment S.A. | 1 | 16.8 million | 12 Sep 2015 |
| Janz - Contadores de Energia, SA | 1 | 16.8 million | 5 Nov 2011 |
| Janz - Contagem e Gestão de Fluídos S.A. | 1 | 16.8 million | 25 May 2023 |
| Milénio 3 Sistemas Electrónicos, Lda. | 1 | 16.8 million | 21 Dec 2003 |
| MOBITITECABSOLUT S.A. | 1 | 16.8 million | 4 Mar 2025 |
| Novabase SGPS, SA | 1 | 16.8 million | 24 Oct 2001 |
| PT Inovacao | 1 | 16.8 million | 4 Jun 2001 |
| PT Inovação e Sistemas SA | 1 | 16.8 million | 23 Jan 2015 |
| Sinepower Lda | 1 | 16.8 million | 25 Jan 2024 |
| SMD INFORMATICA S.A. | 1 | 16.8 million | 22 Apr 1998 |
| Thought Creator | 1 | 16.8 million | 17 May 2011 |
| Visteon Portuguesa, Ltd | 1 | 16.8 million | 11 Apr 2025 |
| WISEWARE, Lda | 1 | 16.8 million | 26 Jun 2013 |
| Bosch Security Systems | 1 | 1 million | 27 Aug 2025 |
| ENGISAT LDA | 1 | 1 million | 1 Mar 2019 |
| Keenfinity S.A. | 1 | 1 million | 23 Jul 2026 |
| NIBBLE | 1 | 1 million | 13 Jul 2019 |
| PICadvanced SA | 1 | 1 million | 4 Nov 2022 |
| withus | 1 | 1 million | 2 Apr 2017 |
| Atik Cameras Unipessoal, Lda | 1 | 4.1 thousand | 24 Jul 2026 |
| B2cloud lda | 1 | 4.1 thousand | 29 Oct 2020 |
| CAPTEMP, Lda | 1 | 4.1 thousand | 29 Nov 2015 |
| Cleanwatts Digital, S.A. | 1 | 4.1 thousand | 28 Jan 2022 |
| Critical Software SA | 1 | 4.1 thousand | 8 Oct 2021 |
| Digicontrole Lda | 1 | 4.1 thousand | 30 Jul 2008 |
| DISPLAX S.A. | 1 | 4.1 thousand | 30 Sep 2021 |
| ISA - Intelligent Sensing Anywhere, S.A. | 1 | 4.1 thousand | 26 Oct 2008 |
| Marques,S.A. | 1 | 4.1 thousand | 20 Mar 2016 |
| Micro I/O Servicos de Electronica, Lda | 1 | 4.1 thousand | 18 Apr 2010 |
| Open Grow | 1 | 4.1 thousand | 15 May 2016 |
| RB-LINK Wireless | 1 | 4.1 thousand | 3 Nov 2013 |
| SISMODULAR - Engenharia, Lda | 1 | 4.1 thousand | 30 Nov 2008 |
| UAVISION Engenharia de Sistemas | 1 | 4.1 thousand | 30 Jul 2008 |
Every organization with blocks registered in Portugal, sorted by total address space.