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
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Marcaria.com LLC
8345 NW 66 ST #B1673
US-33166 MIAMI Florida
Phone: +1 305-434-8621

Email: support@marcaria.com
Web: http://www.marcaria.com/is

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NameCheap, Inc.
4600 East Washington Street
Suite 305
US-85034 Phoenix Arizona
Phone: +1 661-310-2107

Email: support@namecheap.com
Web: https://namecheap.com