The Number Resource Organization (NRO) has published an updated version of the RIR Comparative Policy Overview. The document covers policies across the five Regional Internet Registries (RIRs) -AFRINIC, APNIC, ARIN, LACNIC, and RIPE NCC. Some of the addressed policies include: allocations and assignments of IPv4 and IPv6, allocations and assignments of Autonomous System Numbers (ASNs), recovering unused resources, database -registration, reverse DNS, etc.