.is .is .is (dot is) is the top-level domain for Iceland. The country code is derived from the first two letters of "Ísland", which is the Icelandic word for Iceland. Registration of .is domains is open to all persons and companies without any special restriction. The very first .is-domain, hi.is, is the domain of University of Iceland. It was registered on December 11, 1986, making it one of the earliest ever domain registrations on the Internet. According to McAfee report "Mapping the Mal Web", ".is" has been evaluated as one of the top 10 most secure TLDs in the world in
Inter-domain Independent Multicast. A PDC uses a number of special computer programs to announce its presence to other domain controllers. It uses Windows Internet naming service WINS and Browser services to allow other computers to gain access to digital information that it has control over. The opposite of inter-domain routing is "intra-domain routing": Routing "within" a domain or an autonomous system. Inter-domain Inter-domain is data flow control and interaction between Primary Domain Controller (PDC) computers. This type of computer uses various computer protocols and services to operate. It is most commonly used to multicast between internet domains. An Internet service provider,