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
Cyprus | Denmark | France | Germany | Iceland | Luxembourg | Norway | Sweden | United Kingdom | United States

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1984 ehf
Austurstræti 12
IS-101 Reykjavík
Phone: 354 5781984

Email: hostmaster@1984.is
Web: http://www.1984.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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Atómstöðin ehf
Túngata 3
IS-101 Reykjavík
Phone: 354 5169000

Email: info@atomstodin.is
Web: http://www.atomstodin.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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Basis
Snorrabraut 56a
IS-105 Reykjavík
Phone: +354 5750400

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

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Bemar ehf
Hamarshöfði 1
IS-110 Reykjavík
Phone: +354 4901279

Email: thjonusta@bemar.is
Web: http://bemar.is

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Davíð og Golíat ehf
Akralind 3
IS-201 Kópavogur
Phone: 354 5177700

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

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DCG Iceland ehf
Smáratorgi 3
IS-201 Kópavogur
Phone: +354 534 2050

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

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Go.is internetlausnir ehf
Skúlatúni 2
IS-105 Reykjavík
Phone: 354 5344900

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

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Hýsingar.is
Hafnargata 35
IS-230 Reykjanesbær
Phone: 354 4216816

Email: info@hysingar.is
Web: http://www.hysingar.is

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Internetið ehf
Ármúla 18
IS-105 Reykjavík
Phone: 354 5111440

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

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Nethönnun ehf
Ármúli 5
IS-108 Reykjavík
Phone: +354 5173400

Email: info@nethonnun.is
Web: http://www.nethonnun.is

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Netmiðlar ehf
Skeifan 4
IS-108 Reykjavík
Phone: 354 5884488

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

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Netsamskipti ehf.
Hafnargötu 35
IS-230 Keflavík
Phone: 354 4216816

Email: info@netsamskipti.is
Web: http://www.netsamskipti.is/

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Netvistun ehf.
Hamraborg 20a
IS-200 Kópavogur
Phone: 354 4145500

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

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NyX EHF
Suðurhella 6
IS-221 Hafnarfjörður
Phone: +354 5552244

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

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Opex ehf
Ármúla 1
IS-108 Reykjavík
Phone: 354 5123900

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

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

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

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Outcome Hugbúnaður ehf.
Bíldshöfða 18
IS-110 Reykjavík
Phone: 354 5331440

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

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Skyggnir
Urðahvarf 6
IS-201 Kópavogur
Phone: 354 5161000

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

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SmartMedia ehf
Vestmannabraut 36
IS-900 Vestmannaeyjar
Phone: 354 5884100

Email: info@smartmedia.is
Web: http://smartmedia.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
Hafnarstræti 95
4. hæð
IS-600 Akureyri
Phone: 354 4648700

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

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TSC ehf.
Grundargötu 50
IS-350 Grundarfjörður
Phone: 354 4308040

Email: info@tsc.is
Web: http://tsc.is

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Tæknimiðlun ehf
Höfðatúni 12
IS-105 Reykjavík
Phone: 354 5753707

Email: hostmaster@tml.is
Web: http://www.taeknimidlun.is

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Umsjá Nýherja
Borgartúni 37
IS-105 Reykjavík
Phone: 354 5697700

Email: ver@nyherji.is
Web: http://www.nyherji.is/

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Vefhysing.is
Skeifan 4
IS-108 Reykjavík
Phone: 354 5518500

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

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X.is
Ármúli 5
IS-108 Reykjavík
Phone: 354 5173400

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

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Þekking
Hafnarstræti 93-95
IS-600 Akureyri
Phone: 354 4603100

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