This message has been sent to several lists. I apologise for duplicates. IANA has improved the format for the IPv4 Address Space registry. At the same time, the entries that were marked ³Various Registries² have been replaced with references to the Regional Internet Registry (RIR) that provides WHOIS and reverse DNS service for that /8 allocation. If you want to machine-process the IPv4 registry, the new fields are: * Prefix * Designation * Date * Whois * Status * Note where the Date will always be of the form ³YYYY-MM² and the status has the following possible values: RESERVED, LEGACY, ALLOCATED and UNALLOCATED /8 allocations that contain legacy assignments in them that are now managed by the RIRs have the text ³Administered by² in the Designation column. Legacy assignments refer to IP address allocations made before the RIR system was established. Reserved address space held by IANA does not have a date listed. The registry can be found at: http://www.iana.org/assignments/ipv4-address-space If you have questions about the structure of the new format, please send e-mail to iana@iana.org. Kind regards, Leo Vegoda Manager, Number Resources - IANA