In 1989, Karrenberg was one of the founders of RIPE, the platform for cooperation between European internet providers. In 1992, he was instrumental in founding the world's first Regional Internet Registry, the RIPE NCC, responsible for Europe, the Middle East and parts of Africa and Central Asia, which he headed until 1999.[3][6]
From 2000, Karrenberg was the lead scientist at RIPE NCC, leading operational activities[2] in numerous projects including RIPE Routing Information Service (RIS), RIPE Test Traffic Measurements (TTM), DNS Monitoring Service (DNSMON), and Name Server Daemon (NSD).[3][6]
From 2005 to 2011, Karrenberg was a member of the Board of Trustees of the Internet Society, of which he chaired for three years.[4]
Awards
In 2001, Karrenberg received the Jonathan B. Postel Service Award[3] for Two Decades Of Extraordinary Dedication To The Development Of Networking In Europe And Around The World.[2] In 2012, he was inducted into the Internet Hall of Fame in the Global Connectors category.