Smallest netblock that providers will accept?

Christian Koch christian at
Mon Aug 18 21:01:22 CDT 2008

a lot of providers have their bgp/routing policy published somewhere
online/in their community guide

for instance, you can find L3's policy in their irr objects ( whois -h as3356)

there are also plenty of community guides available here -


On Mon, Aug 18, 2008 at 9:32 PM, Mike Lyon <mike.lyon at> wrote:
> Hello All,
> I am curious as to the routing polices of the bigger providers such as
> ATT, L3, Internap, Qwest, Etc Etc...  Is there a standard size
> netblock that these providers will accept? For instance, if customer
> "A" gets a /22 from ARIN and his upstream provider is ATT and L3, what
> would the smallest block be that those providers would accept from
> customer "A"? Would they accept something as small as a /24?
> Thanks,
> Mike

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