The listings you get from ARIN for non-North American IP allocations are basically summaries. If you want a more detailed listing you'll need to do the look-up on the appropriate site (ie RIPE, APNIC, etc).
And yes, they all list them slightly differently. They are not technically part of ICANN (which handles domain names) but IANA that handles IP address allocations.
Last edited by NyteOwl; 11-11-2012 at 12:54 PM.