Important notes on the APNIC AS0 ROA

APNIC publishes an AS0 ROA, in accordance with RCF 6483, to indicate IPv4 and IPv6 address ranges which have not been delegated, and which should therefore NOT be routed. The use of AS0 in operational routing carries risks which should be fully understood by the user. 

Depending on router configuration, errors in the AS0 ROA could cause unintended interruption to routing with other networks. For this reason, it is strongly recommended that the AS0 ROA is used for advisory and/ or alerting purposes only, and not for automatic filtering of BGP routes. 

The use of a different Trust Anchor Locator (TAL) for the APNIC AS0 ROA is intended to ensure that the ROA cannot be used inadvertently by any operator. Nevertheless, operators must be aware of the risks involved in use of the AS0 ROA and must accept full responsibility for any consequences. 

It should also be noted that APNIC’s AS0 ROA includes only address blocks for which APNIC is authoritative. Therefore, it can only help to identify unallocated blocks within APNIC’s address ranges, and not within ranges held by other Regional Internet Registries (RIR) or the Internet Assigned Numbers Authority (IANA).  

If other RIRs also publish AS0 ROAs, it should be possible to use the entire set of ROAs to achieve better coverage of unallocated IP address space.

Please also see Notes on the use of APNIC RPKI.