Re: ASN to IP Mapping

[Geoff Huston <gih () apnic net>]

> On 8 Mar 2015, at 1:39 pm, Randy Bush <randy () psg com> wrote:
>
> > If you want to know the registry assignments / allocations made to a
> > single entity and be able group together these assignments of address
> > prefixes and ASNs you should retrieve the combined extended stats file
> > from the RIRs
> > (https://www.nro.net/wp-content/uploads/apnic-uploads/delegated-extended)
> > and group together all those entries with a common value in column 8
> > (except for the entries corresponding to assignments and allocations
> > made by the RIPE NCC, where this information is, unfortunately, not
> > published by them in such a convenient format.)
>
> care to give a decode for the fields in that file?  :)


sure, I'll try.

for example:
   arin|US|asn|32|1|19840924|assigned|658cc9c515b51665f88b7fd1bc213d20|e-stats

Col 1 - RIR name, or 'iana'
Col 2 - The country where the entity 'resides' (or 'EU' in some cases), or 'ZZ' for reserved and unassigned blocks
Col 3 - 'asn' or 'ipv4' or 'ipv6'
Col 4 - The size of the allocation (asn or IPv4) or the prefix length (ipv6)
Col 5 - The starting value of the block
Col 6 - A date. For some registries this is the date of the original allocation - for others (ARIN) its not so clear 
precisely what this date signifies (!)
Col 7 - Status of the block
Col 8 - A hash field of the entity code (mu;ltiple allocations to the same entity have the same code) or null (RIPE 
NCC, IANA)
Col 9 - The source of the record (either "e-stats' where the original source is an extended stats file published by an 
RIR, or 'iana' if the data is lifted from an IANA registry)