Hi,

Just trying to get some clarity and direction regarding obtaining address space/ASN for my client.

Is there a minimum address space (?) an entity would need to justify to go directly to RIR (ARIN in this case) as opposed to the upstream provider? Is /20 the minimum allocation? Can my client approach RIR and request for a /23?

The minimum assignment from ARIN is actually a /22, which will only be given to multi-homed end-users who qualify (http://www.arin.net/policy/nrpm.html#four3). Other than that, the smallest assignment is /20.

If my client do procure a /23 how do they make make sure that this address space will be globally routable?

Regardless of where their IP's come from, all they have to do is announce them to their upstream providers using BGP.

Multihome will also be part of their network implementation, can they apply for an ASN number?

Yes, they can apply for an ASN number as long as they can show ARIN that they are in the process of bringing up connectivity with more than one ISP. ARIN's web page is actually pretty easy to navigate for finding this and all the other information you will need. I would suggest checking it out. http://www.arin.net ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Rob Reeves IP Network Engineer Arbinet 703-456-4172 rreeves@arbinet.com ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~