Exhibit 21.1

Subsidiaries of InterXion Holding N.V.

Name of Subsidiary	Jurisdiction
InterXion HeadQuarters B.V.	The Netherlands
InterXion Nederland B.V.	The Netherlands
InterXion Trademarks B.V.	The Netherlands
InterXion Österreich GmbH	Austria
InterXion Belgium N.V.	Belgium
InterXion Denmark ApS	Denmark
InterXion France SAS	France
InterXion Deutschland GmbH	Germany
InterXion Ireland Ltd	Ireland
InterXion Telecom SRL	Italy
InterXion España SA	Spain
InterXion Sverige AB	Sweden
InterXion (Schweiz) AG	Switzerland
InterXion Carrier Hotel Ltd.	United Kingdom
InterXion Real Estate Holding B.V.	The Netherlands
InterXion Real Estate I B.V.	The Netherlands
Centennium Detachering B.V.	The Netherlands
InterXion Consultancy Services B.V.	The Netherlands
InterXion Telecom B.V.	The Netherlands
InterXion Trading B.V.	The Netherlands
InterXion B.V.	The Netherlands
InterXion Europe Ltd.	United Kingdom
InterXion Telecom Ltd.	United Kingdom