Machine-to-Machine (M2M) communication has been described for communication in a single network in among others publications from the European Telecommunications Standards Institute (ETSI). The publications describe a single network with defined entities, a resource structure and protocols. According to the invention, a solution is described for communication between entities residing in different M2M networks. Entities or applications residing in a first M2M network requiring information of an entity in another second M2M network submit a request with a target ID pointing to the entity in the second M2M network. The request is forwarded to the network node of the first network. The network node of the first network checks whether the target ID matches with an entity of a second network that according to a Domain Name Server (DNS) lookup has an address of a second network node of the second M2M network. On a match the request is routed towards the retrieved second network node of the second M2M network. The second network node routes the request further towards the second entity according to registration information stored in its resources. On reception of the request the second entity processes the request and returns a reply via the path created by the previous steps.
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