| 1819 - Nýr valkostur ehf. | Akralind 6, 201 Kópavogur, Iceland | | 20.6.2014 | Directory enquiry service |
| Advania Iceland ehf. | Guðrúnartún 10, 105 Reykjavík, Iceland | www.advania.is | 17.4.2002 | Data transmission service |
| Alza ehf. | Ármúla 4-6, 108 Reykjavik, Iceland | | 1.9.2017 | Data transmission service via fixed and wireless electronic communication networks |
| Alþingi | Kirkjustræti, 150 Reykjavík, Iceland | www.althingi.is | 23.3.2015 | Transmission of radio and television signals |
| Astrocast SA | Chemin des Ramiers 20, Chavannes-prés-Renens | | 29.9.2020 | Data transmission service |
| Austurljós ehf. | Miðvangi 6, 700 Fljótsdalshérað, Iceland | | 5.3.2015 | Data transmission and service |
| Ábótinn ehf. | Eystra-Geldingaholt, 801 Selfoss, Iceland | www.abotinn.is | 28.3.2003 | Data transmission and service |
| Árvakur hf. | Hádegismóar 2, 110 Reykjavík, Iceland | | 26.1.2015 | Directory enquiry service |
| Ásaljós | Laugalandi, 851 Hella, Iceland | | 18.8.2015 | Operation of fixed electronic communication network |
| Bláskógaljós | Aratungu, 801 Selfoss, Iceland | www.blaskogaljos.net | 20.12.2019 | Operation of fixed electronic communication network |
| Bloomberg Finance L.P. | 731 Lexington Avenue, New York 10022, USA | www.bloomberg.com | 19.7.2007 | Leased line and network |
| Boðleið Þjónusta ehf. | Akralind 8, 201 Kópavogur, Iceland | | 1.12.2015 | Voice telephony, mobile telephony and operation of fixed data transmission network |
| Brimrún ehf. | Hólmaslóð 4, 101 Reykjavík, Iceland | www.brimrun.is | 3.4.2008 | Data transmission via satellite |
| BT Solutions Limited, útibú á Íslandi | Co. Deloitte, Smáratorg 3, 201, Kópavogur, Iceland | | 28.7.2014 | Data transmission services |
| CenturyLink Iceland ehf. | Suðurlandsbraut 20, 108 Reykjavík, Iceland | | 1.12.2015 | Operation of fixed electronic communication network and data transmission service |
| Colt Technology Services AB | Box 3458, Sveavägen 56 C, SE – 103 69 Stockholm, Sweden | www.colt.net | 29.9.2015 | Data transmission services |
| Cronus ehf. | Dalvegi 16b, 201 Kópavogi, Iceland | | 1.10.2019 | Transmission of radio and television signals |
| Cubic Telecom Limited | Corrig Court, Corrig Road, Sandyford Business Park, D18 Dublin, Ireland | | 9.8.2018 | Operation of fixed and wireless electronic communications network and data transmission via wireless electronic communications networks |
| Dalaveitur ehf. | Miðbraut 11, 370 Dalabyggð, Iceland | | 14.2.2017 | Operation of fixed electronic communications network |
| DCN Hub ehf. | Borgartúni 31, 105 Reykjavík, Iceland | | 10.12.2012 | Mobile and data transmission services |
| DIDWW Ireland Limited | 10/13 Thomas Street, The Digital Hub, Dublin 8, Dublin, Ireland | www.didww.com | 26.2.2019 | Data transmission and telephony service |
| Digriklettur ehf. | Selhólavegi 6, 881 Skaftárhreppi, Iceland | | 1.4.2019 | Operation of fixed electronic communications network |
| DVD-Margmiðlun ehf. | Hólmgarði 2c, 230 Reykjanesbæ, Iceland | | 6.2.2004 | Broadcast cable network |
| EchoStar Mobile Limited | 25/28 North Wall Quay, Dublin 1, Ireland | www.echostarmobile.com | 1.7.2020 | Mobile satellite services |
| Eyja- og Miklaholtshreppur | Hofsstöðum, 311 Eyja- og Miklaholtshreppi, Iceland | www.eyjaogmikla.is | 29.9.2015 | Fixed data transmission network |
| Factor ehf. | Hrafnhólum 4, 111 Reykjavík, Iceland | | 30.5.2013 | Data transmission and service |
| Farice ehf. | Smáratorgi 3, 201 Kópavogi, Iceland | www.farice.is | 2.9.2003 | Submarine cable |
| Ferðaþjónustan Húsafelli ehf. | Húsafelli, 311 Borgarbyggð, Iceland | | 23.4.2018 | Operation of fixed electronic communications network |
| Fjarskiptafélag Mývatnssveitar ehf. | Hlíðavegi 6, 660 Mývatn, Iceland | | 10.4.2017 | Data transmission service via fixed electronic communication network |
| Fjarskiptafélag Reykhólahrepps | Maríutröð 5a, 380 Reykhólahreppi, Iceland | www.reykholar.is | 9.8.2018 | Operation of fixed electronic communications network |
| Fjarskiptafélag Skagabyggðar | Ytri Hóll 1, 541 Blönduós, Iceland | | 8.6.2016 | Data transmission network |
| Fjarskiptafélag Skeiða- og Gnúpverjahrepps ehf. | Árnes, 801 Skeiða- og Gnúpverjahreppi, Iceland | | 8.3.2013 | Data transmission network |
| Fjarskiptafélag Svalbarðshrepps ehf. | Holti, Svalbarðshreppi, 681 Þórshöfn, Iceland | | 14.2.2017 | Operation of fixed electronic communications network |
| Fjölnet ehf. | Ártorgi 1, 550 Sauðárkrókur, Iceland | www.fjolnet.net | 26.10.2001 | Voice telephony, data transmission and network |
| Flóaljós | Þingborg, 801 Selfossi, Iceland | www.floaljos.net | 17.1.2020 | Operation of fixed electronic communication network |
| Gagnaveita Helgafellssveitar ehf. | Birkilundi 43, 340 Stykkishólmur, Iceland | | 18.8.2015 | Operation of fixed electronic communication network |
| Gagnaveita Hornafjarðar ehf. | Hafnarbraut 27, 780 Höfn í Hornafirði, Iceland | | 13.2.2013 | Electronic communication networks |
| Gagnaveita Reykjavíkur ehf. | Bæjarhálsi 1, 110 Reykjavík, Iceland | www.gagnaveita.is | 23.3.2007 | Data transmission and service |
| Gagnaveita Suðurlands ehf. | Lyngás 10, 210 Garðabær, Iceland | www.gagnaveitan.is | 9.12.2013 | Data transmission service |
| Gagnaveitan ehf. | Lyngás 10, 210 Garðabær, Iceland | | 8.6.2011 | Electronic communication services |
| GlobalCall ehf. | Ármúli 7, 108 Reykjavík, Iceland | www.globalcall.is | 4.9.2008 | Voice telephony |
| Globalstar Europe Satellite Services Ltd. | Unit 10, The Hyde Building, D18VK58, Dublin 18, Ireland | www.globalstar.com | 21.02.2020 | Satellite services |
| Halló ehf. | Nóatún 17, 105 Reykjavík, Iceland | www.1800.is | 23.5.2014 | Directory enquiry service |
| Hátíðni ehf. | Fiskihóli 11, 780 Höfn í Hornafirði, Iceland | hatidni.is | 17.8.2020 | Voice telephony, operation of wireless electronic communication networks, data transmission via fixed and wireless electronic communications networks and transmission of radion and television signals |
| Hitaveita Drangsness | Holtagötu, 520 Kaldrananeshreppi, Iceland | www.drangsnes.is | 28.3.2019 | Operation of fixed electronic communication network |
| Hitaveita Egilsstaða/Fella ehf. | Einhleypingi 1, 700 Egilsstaðir, Iceland | www.hef.is | 11.9.2018 | Operation of fixed and wireless electronic communication networks, data transmission via fixed and wireless electronic communications networks and transmission of radio and television signals |
| Hitaveita Tálknafjarðarhrepps | Miðtúni 1, 460 Tálknafjörður, Iceland | | 24.6.2015 | Data transmission network |
| Hljóðsmárinn | Hólavegi 5, 580 Siglufirði, Iceland | | 24.10.2017 | Transmission of radio and television signals |
| Hópkaup ehf. | Sóltún 26, 105 Reykjavík, Iceland | | 28.4.2015 | Directory enquiry service |
| Hótel Laki ehf. | Efri-Vík, 880 Kirkjubæjarklaustri, Iceland | | 10.4.2017 | Operation of fixed electronic communication network |
| Hrafnshóll ehf. | Reykjavíkurvegi 64, 220 Hafnarfjörður, Iceland | | 30.01.2019 | Operation of fixed electronic communication network |
| Hringdu ehf. | Ármúli 23, 108 Reykjavík, Iceland | www.hringdu.is | 9.11.2010 | Voice telephony and data transmission service |
| Hringiðan ehf./Vortex Inc. | Skúlagötu 19, 101 Reykjavík, Iceland | www.vortex.is | 3.12.1998 | Voice telephony, data transmission and network |
| Hrunaljós | Akurgerði 6, 845 Flúðir, Iceland | www.fludir.is | 17.1.2020 | Operation of fixed electronic communication network |
| Húnanet ehf. | Húnavöllum, 541 Blönduósi, Iceland | | 23.10.2017 | Fixed line network |
| Hvalfjarðarsveit | Innrimelur 3, 301 Akranes, Iceland | | 31.3.2014 | Electronic communication networks |
| Icelandair ehf. | Reykjavíkurflugvöllur, 101 Reykjavík, Iceland | www.icelandair.com | 14.2.2014 | Network |
| IMC Ísland ehf. | Borgartúni 31, 105 Reykjavík, Iceland | | 27.6.2000 | Mobile DSC 1800 |
| Internet á Íslandi hf. | Katrínartúni 2, 105 Reykjavík, Iceland | www.isnic.is | 3.2.1998 | Network, voice telephony and data transmisson |
| Isavia ANS ehf. | Reykjavíkurflugvelli, 102 Reykjavík, Iceland | | 21.2.2020 | Operation of fixed electronic communication network |
| Isavia ohf. | Flugturn Reykjavíkurflugvelli, 101 Reykjavík, Iceland | www.isavia.is | 30.12.2010 | Voice transmission service for aircrafts and operation of fixed electronic communication network |
| Já hf. | Álfheimar 74, 104 Reykjavík, Iceland | www.ja.is | 21.11.2007 | Publication of directories, directory enquiry service |
| Kukl ehf. | Krókhálsi 6, 110 Reykjavík, Iceland | www.kukl.is | 20.3.2009 | Voice telephony, data transmission and network |
| Landhelgisgæsla Íslands | Skógarhlíð 14, 105 Reykjavík, Iceland | www.lhg.is | 1.1.2011 | Management and lease of NATO´s optical fibre network |
| Leiðarljós ehf. | Ásgarði, 276 Kjós, Iceland | | 14.2.2017 | Operation of fixed electronic communications network |
| Lindin, kristið útvarp | Krókháls 4, 110 Reykjavík, Iceland | | 26.1.2015 | Transmission of radio and television signals |
| LíF í Mýrdal ehf. | Ási, 871 Vík, Iceland | | 15.9.2014 | Fixed line network data transmission |
| Ljós og gagnaleiðari ehf. | Dvergshöfða 2, 110 Reykjavík, Iceland | | 10.8.2009 | Data transmission network |
| Ljósfesti ehf. | Jaðri, 311 Borgarnes, Iceland | | 19.12.2016 | Operation of fixed electronic communication network |
| Ljósleiðari Borgarbyggðar | Borgarbraut 14, 310 Borgarnesi, Iceland | ljosborg.net | 18.10.2019 | Operation of fixed electronic communication network |
| Ljóspunktur ehf. | Grund, 311 Skorradalshreppi, Iceland | skorradalur.is | 24.10.2017 | Fixed line network and data transmission via fixed electronic communications networks |
| Loki Telecom ehf. | Dalvegur 16b, 201 Kópavogur, Iceland | | 4.5.2015 | Fixed and wireless telecommunication networks, fixed and wireless data transmission and transmission of radio and television signals |
| Lysir ehf. | Hringhellu 9, 221 Hafnarfirði, Iceland | www.lysir.is | 20.12.2019 | Operation of wireless electronic communication networks |
| Magnavík ehf. | Bakkagata 22, 670 Kópasker, Iceland | www.magnavik.is | 1.4.2004 | Data transmission service |
| Martölvan ehf. | Vogabraut 1, 780 Höfn í Hornafirði, Iceland | www.martolvan.is | 26.11.2007 | Voice telephony, data transmission and network |
| Míla ehf. | Stórhöfða 22-30, 110 Reykjavík, Iceland | www.mila.is | 4.4.2007 | Electronic communication network |
| Mobiweb Telecom Limited | Third Floor, 207 Regent Street, W1B 3HH, London, UK | | 19.12.2016 | Mobile service |
| Nepal hugbúnaður ehf. | Bjarnarbraut 8, 310 Borgarnes, Iceland | www.nepal.is | 21.2.2005 | Data transmission service and wireless data transmission |
| Netvarp og Sport ehf. | Krókhálsi 6, 110 Reykjavík, Iceland | www.netvarpid.is | 18.7.2017 | Transmission of radio and/or television singals |
| Netvöktun ehf. | Egilsgötu 19, 310 Borgarnes, Iceland | www.netvoktun.is | 9.8.2018 | Voice telephony, operation of fixed and wireless electronic communications networks and fixed and wireless data transmission service |
| NewVoiceMedia Ltd. | Rosalind House, Jays Close, Basingstoke RG22 4BS, United Kingdom | | 17.8.2020 | Voice and mobile telephony and fixed line network |
| Neyðarlínan ohf. | Skógarhlíð 14, 105 Reykjavík, Iceland | 112.is | 6.10.1999 | Voice telephony - emergency service |
| Nordic Networks ehf. | Bolholti 8, 105 Reykjavík, Iceland | | 24.11.2016 | Submarine cable and data transmission service |
| Nova hf. | Lágmúla 9, 108 Reykjavík, Iceland | www.nova.is | 12.7.2006 | Voice telephony and data transmission |
| OnAir S.A.R.L. | 71 Avenue Louis Casai, 1216 Cointrin, Genf, Switzerland | | 29.4.2008 | Mobile communication services on aircraft (MCA) |
| Opin kerfi hf. | Höfðabakka 9, 110 Reykjavík, Iceland | www.opinkerfi.is | 25.2.2011 | Data transmission service |
| Origo hf. | Borgartúni 37, 105 Reykjavík, Iceland | www.origo.is | 12.12.2011 | Data transmission service |
| Orkufjarskipti hf. | Krókhálsi 5c, 110 Reykjavík, Iceland | www.orkufjarskipti.is | 26.10.2001 | Electronic communication network |
| Parking Plus ehf. | Skeifunni 8, 108 Reykjavík, Iceland | | 13.12.2010 | Voice telephony and network |
| Premis ehf. | Holtavegi 10, 104 Reykjavík, Iceland | www.premis.is | 24.10.2017 | Voice telephony and mobile services, operation of fixed and wireless electronic communication networks and fixed and wireless data transmission services |
| Protegion ehf. | Dalshrauni 3, 220 Hafnarfjörður, Iceland | | 5.3.2018 | Operation of fixed electronic communication network |
| Rafey ehf. | Miðási 11, 700 Fljótsdalshéraði, Iceland | | 18.8.2015 | Operation of wireless electronic communication network |
| Rangárljós | Suðurlandsvegi 1, 850 Hella, Iceland | | 29.8.2016 | Operation of fixed electronic communication network |
| Refinitiv Norge A/S | Dronning Eufemias gate 16, 0191 Oslo, Norway | | 1.9.2017 | Fixed line network data transmission |
| Ríkisútvarpið ohf. | Efstaleiti 1, 103 Reykjavík, Iceland | www.ruv.is | 29.7.1997 | Transmission of radio and television signals |
| Sensa ehf. | Ármúla 31, 108 Reykjavík, Iceland | www.sensa.is | 19.12.2016 | Data transmission service via fixed electronic communication network |
| Síminn hf. | Ármúla 25, 108 Reykjavík, Iceland | www.siminn.is | 30.7.1998 | Voice telephony, mobile, data transmission and network |
| Sjónvarpsmiðstöðin ehf. | Pósthólf 8756, 128 Reykjavík, Iceland | www.sm.is | 8.10.2009 | Data transmission service |
| Snerpa ehf. | Mjallargötu 1, 400 Ísafjörður, Iceland | www.snerpa.is | 17.8.2000 | Network, voice telephony and data transmisson |
| Splitti ehf. | Ármúla 6, 108 Reykjavík, Iceland | www.splitti.is | 8.7.2019 | Voice telephony, mobile, fixed and wireless data transmission and directory enquiry services |
| Starlink Internet Services Ltd. | 5th Floor, Beaux Lane House, Mercer Street Lower, Dublin 2 | www.starlink.com | 17.12.2020 | Satellite internet service |
| Studio Norn ehf. | Hátún 6a, 105 Reykjavík, Iceland | www.studionorn.is | 14.10.2020 | Transmission of radio and television signals |
| Stöð 5 ehf. | Köllunarklettsvegi 1, 104 Reykjavík, Iceland | | 1.10.2019 | Voice and mobile telephony |
| Sumarsól ehf. | Suðurgötu 6 190 Vogar, Iceland | | 1.12.2015 | Directory enquiry service |
| Swarm Technologies Inc. | 435 N Whisman Rd, Mountain View, CA 94043, USA | www.swarm.space | 17.8.2020 | Narrow-band Satellite Connectivity for IoT and M2M devices |
| Sýn hf. | Suðurlandsbraut 8, 108 Reykjavík, Iceland | www.vodafone.is | 27.3.2007 | Voice telephony, mobile, data transmission and network |
| Tech Support á Íslandi ehf. | Ármúli 42, 108 Reykjavík, Iceland | | 3.3.2017 | Voice telephony and fixed and wireless data transmission services |
| TELE Greenland A/S | Farip Aquttaa 8, P.O. Box 1002 DK-3900 Nuuk, Greenland | www.tele.gl | 24.6.2008 | Submarine cable |
| Tengir hf. | Fjölnisgata 6c, 603 Akureyri, Iceland | www.tengir.is | 20.9.2002 | Fiber optical network |
| Tismi BV | Dorpsstraat 1b, 3981 EA Bunnik, The Netherlands | www.tismi.is | 5.3.2015 | Voice and mobile telephony |
| TRS ehf. | Eyrarvegi 37, 800 Selfoss, Iceland | www.trs.is | 29.3.2004 | Data transmission service |
| Truphone Limited | 25 Canada Square, Canary Wharf, E14 5LQ, London, United Kingdom | www.truphone.com | 22.11.2017 | Mobile telephony and data transmission via wireless electronic communications networks |
| TSC ehf. | Grundargötu 50, 350 Grundarfjörður, Iceland | | 18.1.2002 | Voice telephony, data transmission and network |
| Twilio Ireland Limited | 25-28 North Wall Quay, Dublin, D01 HI04, Republic of Ireland | www.twilion.com | 12.7.2019 | Voice telephony and mobile services, operation of fixed and wireless electronic communication networks and fixed and wireless data transmission services |
| Tölvun ehf. | Strandvegi 51, 900 Vestmannaeyjar, Iceland | www.tolvun.is | 25.4.2003 | Data transmission and service |
| Tölvuþjónustan ehf. | Esjubraut 49 | www.tolva.is | 10.12.2020 | Fixed data transmission service |
| Vengo ehf. | Suðurgötu 6, 190 Vogar, Iceland | | 18.10.2019 | Fixed data transmission service |
| Verne Global hf. | Valhallarbraut 868, 262 Reykjanesbær Ísland | www.verneglobal.com | 29.9.2020 | Fixed data transmission service |
| Yellow Mobile B.V. | Gevers Deynootweg 93C, 2586BK Den Haag, The Netherlands | www.yellow-mobile.nl | 18.7.2017 | Voice and mobile telephony, operation of fixed and wireless electronic communication networks, data transmission via fixed and wireless electronic communications networks |
| Zendensk International Limited | Marine House, Clanwilliam Court, Dublin 2, Ireland | zendesk.com | 9.8.2018 | SMS and VoIP services using software via the cloud |
| Þekking - Tristan hf. | Hafnarstræti 91-95, 600 Akureyri, Iceland | www.thekking.is | 16.1.2004 | Data transmission and service |
| Þorvaldur Stefánsson | Otradalur, 465 Vesturbyggð, Iceland | | 14.10.2014 | Maritime mobile |
| Örugg afritun ehf. | Ármúla 4, 108 Reykjavík, Iceland | www.oruggafritun.is | 18.10.2019 | Fixed data transmission service |
| Öryggisfjarskipti ehf. | Skógarhlíð 14, 105 Reykjavík, Iceland | | 6.10.2008 | Telecommunication service and network / TETRA |