Selection of a default prefix is easy. Here are the steps.
4. Keeping in mind
4.1 Prefixes longer than somewhere around /48 to /56 may be excluded from the global routing table
4.1a Prefix cutouts of any size (including /48) from inside your /32 or larger block may be excluded from the global routing table. Folks who are multihomed and thus need to advertise their own block with BGP should be referred to ARIN for a direct assignment. Folks who aren't multihomed, well, until given evidence otherwise I claim there are no single-homed entities who will use 65,000 LANs, let alone more. =============================================
This brings up another interesting question... We operate Two separate networks in two geographical locations (Two ASN), we have a single /32 allocation from ARIN. Question: Should we be asking ARIN for another /32 so that each network has it's own /32 or should be break out the /32 into /36 and use these in each of the geographies ? Regards Faisal Imtiaz Snappy Internet & Telecom