List of DNS Hosting Providers that host .IS domains and are registered with ISNIC as such.
Information on becoming a registered DNS Hosting Provider is available here.

Providers by country
France | Germany | Iceland | Norway | Sweden | United Kingdom of Great Britain and Northern Ireland | United States of America

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1984 ehf
Austurstræti 12
IS-101 Reykjavík
Phone: +354 578 1984

Email: hostmaster@1984.is
Web: http://www.1984.is/

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Advania hf.
Sætún 10
IS-105 Reykjavík
Phone: +354 569 5100

Email: advania@advania.is
Web: http://www.advania.is/

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ALLRA ÁTTA ehf.
Grensásvegi 1
IS-108 Reykjavík
Phone: +354 588 8885

Email: 8@8.is
Web: http://www.8.is/

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AP Media ehf
Engjateigur 3
IS-105 Reykjavík
Phone: +354 517 7535

Email: hysingar@apmedia.is
Web: http://apmedia.is

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ASTRA ehf
Fákafen 9
IS-108 Reykjavík
Phone: 354 4143100

Email: astra@astra.is
Web: http://www.astra.is

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Auglýsingastofan Dagsverk ehf
Austurströnd 8
IS-170 Seltjarnarnes
Phone: 354 5881350

Email: dagsverk@dagsverk.is
Web: http://www.dagsverk.is

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Bemar Tech
Hamarshöfði 1
IS-110 Reykjavík
Phone: +354 511 1128

Email: bemar@bemar.is
Web: https://bemar.is

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Dacoda ehf
Túngötu 1
IS-230 Reykjanesbæ
Phone: +354 555 7515

Email: hostmaster@dacoda.is
Web: http://www.dacoda.is

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Fjölnet hf
Aðalgata 24
IS-550 Sauðárkróki
Phone: +354 455 7900

Email: hostmaster@fjolnet.is
Web: http://www.fjolnet.is

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FlokiNet ehf.
Skólavörðustíg 12
IS-101 Reykjavík
Phone: +46 8 446 832 45

Email: info@flokinet.is
Web: https://flokinet.is

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Hringiðan ehf/Vortex Inc
Tæknigarði, Dunhaga 5
IS-107 Reykjavík
Phone: +354 5252400

Email: hostmaster@vortex.is
Web: http://www.vortex.is/

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ÍKON EHF _- EDAL.NET
Nýbýlavegi 6
IS-200 Kópavogur
Phone: 354 8611693

Email: vefhysing@edal.is
Web: http://www.edal.is/

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Marknet ehf.
Frostafold 62
IS-112 Reykjavík
Phone: +354 553 9798

Email: marknet@marknet.is
Web: http://www.marknet.is

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Martölvan ehf
Víkurbraut 2
IS-780 Höfn í Hornafirði
Phone: +354 478 1300

Email: martolvan@martolvan.is
Web: http://www.martolvan.is

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Netheimur ehf / Xnet
Síðumúla 3-5
IS-108 Reykjavík
Phone: +354 550 0250

Email: xnet@xnet.is
Web: http://www.netheimur.is/

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Opin kerfi - Lén.is
Skútuvogi 2
IS-104 Reykjavík
Phone: +354 570 1000

Email: len@ok.is
Web: https://ok.is

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Opin Kerfi ehf
Höfðabakki 9
IS-110 Reykjavík
Phone: +354 570 1000

Email: hostmaster@okhysing.is
Web: http://www.ok.is

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Origo ehf.
Borgartún 37
IS-105 Reykjavík
Phone: +354 569 7700

Email: domain@origo.is
Web: http://www.origo.is

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Orkuveita Reykjavíkur - Upplýsingatækni
Bæjarhálsi 1
IS-110 Reykjavík
Phone: +354 5166000

Email: domain@or.is
Web: http://www.or.is

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Overcast ehf.
Höfðabakka 9D
IS-110 Reykjavík
Phone: +354 546 1111

Email: support@overcast.is
Web: https://www.overcast.is

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Sensa ehf
Ármúli 31
IS-108 Reykjavík
Phone: +354 425 1500

Email: hostmaster@sensa.is
Web: http://www.sensa.is

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Síminn
Ármúla 25
IS-150 Reykjavík
Phone: +354 550 6000

Email: hostmaster@simnet.is
Web: http://www.simnet.is/

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Snerpa ehf.
Mánagötu 6
IS-400 Ísafjörður
Phone: 354 5204000

Email: hostmaster@snerpa.is
Web: http://www.snerpa.is/

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Stefna ehf
Glerárgata 34, 4. hæð
IS-600 Akureyri
Phone: +354 464 8700

Email: hjalp@stefna.is
Web: http://www.stefna.is

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Tactica ehf/Hýsingar.is
Fjarðargata 15
IS-220 Hafnarfirði
Phone: +354 546 6000

Email: info@tactica.is
Web: https://tactica.is

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UTV ehf (Office.is)
Hjallahraun 11
IS-220 Hafnarfirði
Phone: +354 555 2244

Email: hostmaster@utv.is
Web: http://www.utv.is

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Vodafone
Skútuvogi 2
IS-104 Reykjavík
Phone: +354 5999000

Email: vodafone@vodafone.is
Web: http://www.vodafone.is/

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X.is
Hádegismóar 4
IS-110 Reykjavík
Phone: +354 547 0000

Email: hjalp@x.is
Web: http://x.is

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Zix ehf.
Hringbraut 78
IS-230 Reykjanesbæ
Phone: +354 547 1100

Email: axel@zix.is
Web: https://zix.is