RFC 1467 (rfc1467) - Page 3 of 9

Status of CIDR Deployment in the Internet

RFC 1467       Status of CIDR Deployment in the Internet     August 1993


         d) Class C network numbers were allocated according to the
            addressing plan of [1], now obsoleted by [2].  Allocation
            continued to be performed by the Internet Registry (IR)
            for regions of the world where an appropriate regional
            registry had not yet been designated by the IANA.

      2) 14 February 93:

         The schedule in [3] was re-evaluated, and there appeared to
         be no reason to readjust it, so it was continued as
         originally set out.

      3) 15 April 93:

         a) The IR began to allocate all networks according to the
            addressing plan of [1], now obsoleted by [2], in
            appropriately sized blocks of Class C numbers.

         b) Class B network numbers became difficult to obtain,
            following the recommendation of the addressing plan and
            were only issued when justified.

   Furthermore, throughout this time period, network service providers
   have requested blocks of network numbers from the Class C address
   space for the purpose of further allocating them to their clients.
   The network service providers were allocated such space by the RIPE
   NCC or the IR, acting for North America and the Pacific Rim. This
   process has started to distribute the function of address
   registration to a more regional level, closer to the end users. The
   process has operated as hoped for, with no major problems.

3. Milestone that has not been met

   The proposed schedule of [3] stated that 6 June 1993 was the date
   when an address aggregation mechanism would be generally available in
   the Internet. Although this target date was based on the plans as
   stated by the router vendors and was reasonable at the time the
   schedule in [3] was formulated, it has slipped.  Nevertheless, the
   continuation of that schedule has so far not added significantly to
   the problems of the Internet. The rest of this document looks at the
   current situation and what can be expected in the near future.

4. Current status of address aggregation mechanisms in commercial
   routers

   Although RFCs 1366, 1466, and 1367 do not depend on any specific
   address aggregation technology, there is consensus in the Internet
   community to use Classless Inter-Domain Routing (CIDR) [4]. CIDR is



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