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 | Romania | Sweden | United Kingdom of Great Britain and Northern Ireland | United States of America

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ingenit GmbH & Co. KG
Emil-Figge-Str. 76-80
DE-44227
Phone: +49 23197424123

Email: support@123domain.eu
Web: http://www.123domain.eu

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INWX GmbH
Prinzessinnenstr. 30
DE-10969 Berlin
Phone: +49 30 9832120

Email: info@inwx.de
Web: http://www.inwx.com/en/is-domain.html

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united-domains AG
Gautinger Straße 10
DE-D-82319 Starnberg
Phone: +49 8151 368670

Email: hostmaster@united-domains.de
Web: http://www.united-domains.de

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Variomedia AG
August-Bebel-Str. 68
DE-14482 Potsdam
Phone: +49 331 237890

Email: info@variomedia.de
Web: http://variomedia.de