RFC 2050: INTERNET REGISTRY IP ALLOCATION GUIDELIN...
RFC-Ref

subnet


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... of IPv4 address space, all assignments are made with the assumption that sites make use of variable length subnet mask (VLSM) and classless technologies within their network. Any ...


... Exceptions to the criteria will not be made based on insufficient equipment without additional detailed justification. Organizations should implement variable length subnet mask (VLSM) internally to maximize the effective utilization of address space. Address ...
... 1. subnetting plans, including subnet masks and number of hosts on each subnet ...
... subnet masks and number of hosts on each subnet for at least one year 2. a description of the network topology ...
... a) a tabular listing of all subnets on the network ...
... network b) its associated subnet masks c) the estimated number of hosts ...
... hosts d) a brief descriptive remark regarding the subnet. ...
... implemented is required. Care must be taken to ensure that the host and subnet estimates correspond to realistic requirements and are not based on administrative convenience. ...



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