Contents

Structures of the Network Connections

 There are two major ways to give a school an access to the Internet.
One way is to connect the school to an exiting LAN, which is already connected to the Internet, either directly or using an exclusive line for LAN to LAN connection. Seven schools, most of them are attached schools to universities, are connected in this way.
The other way is to connect the school to one of the network organizations, which are already connected to the Internet and listed below. Included in the list of networks are two backbone networks, eleven regional networks and one commercial network. Most of the member schools are connected in this way.
  • School Counts by Network Organizations
  • IP Addresses and Domain Names

    School Counts by Network Organizations

     The table below shows the number of connecting schools to each network.

    network NOCsdigitalanalogLAN connection
    NORTH 1 1 2 0
    TiA 1 3 7 0
    RIC-Tsukuba 1 1 2 0
    TRAIN 5 9 18 2
    WIDE 3 0 5 2
    SPIN 1 0 0 1
    FITnet 6 1 5 2
    HINT 1 1 2 0
    TIC 1 2 4 0
    NCA5 1 3 1 0
    ORIONS 5 5 9 0
    CSI 2 3 8 0
    KARRN 9 4 8 0
    SINET 2 1 1 0
    Note 1: Universities give connections to their attached schools are included in the NOC count.
    Note 2: "digital" is the count of schools connected by 64 Kbps digital exclusive lines.
    Note 3: "analog" is the count of schools connected by 3.4 KHz analog exclusive lines.

    IP Addresses and Domain Names

     With cooperations of WIDE project, an IP address of class C is allocated to each school. The addresses range from 202.249.20.0 to 202.249.185.0. There are exceptions to this. An attached school, in many cases to a university, is allocated a subnetwork address of the IP address of its superior organization. Also some schools had, at the time of the 100-school project start, already obtained addresses of class B on their own, and they have kept on using those addresses.

    As for domain names, each member is given a "location dependent domain name" (reference) . The exceptions to this are much the same as above. Attached schools are treated as subdomains of their superior, and two schools, among the five who already had obtained domain names on their own at the time, have names not of location dependent type but in ac.jp style.