Change to minimum portable prefix size on APNIC IPv4 address blocks
Hi NZNOG Community,
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
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
If you have any questions please contact the APNIC Helpdesk at:
APNIC Secretariat secretariat(a)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.