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Change to minimum portable prefix size on APNIC IPv4 address blocks ________________________________________________________________________

As a follow up to an informational presentation by the APNIC Secretariat at the APNIC 30 plenary, "IPv4 Tomorrow?", APNIC is making an operational change to the minimum portable prefix size for all APNIC IPv4 ranges.

As APNIC's IPv4 transfer policy permits transfers of /24 blocks and larger, it is now possible that routable prefixes within a /8 are now smaller than the minimum allocation size of a /22.

Therefore, the minimum portable prefix size for all APNIC IPv4 /8 address blocks has been changed to a /24. Please note, there has been no change to the minimum IPv4 allocation size, which remains a /22.

Please update your network configurations, such as router filter sizes based on the IPv4 address block minimum prefix size, where required.

For more information on the affected /8 blocks, see

http://www.apnic.net/publications/news/2010/min-prefix

If you have any questions please contact the APNIC Helpdesk at:

helpdesk@apnic.net

Kind regards,

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APNIC Secretariat secretariat@apnic.net Asia Pacific Network Information Centre (APNIC) Tel: +61 7 3858 3100 PO Box 2131 Milton, QLD 4064 Australia Fax: +61 7 3858 3199 Level 1, 33 Park Road, Milton, QLD http://www.apnic.net ________________________________________________________________________ * Sent by email to save paper. Print only if necessary.