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The goal here is to arrive at a blocking strategy that keeps people and bots from outside North America off your site.
The American diaspora or Overseas Americans refers to the population of United States citizens who relocate, temporarily or permanently, to foreign countries. There are no reliable figures on how many Americans live abroad, but a State Department estimate suggests that the number may be between 3 million and 6 million.
And, ouch, did you really forget 37 or is there some arcane reason for not listing it?
You forgot 25 (UK ministry of defence)
31 36 37 39
[edited by: webcentric at 5:56 am (utc) on Apr 18, 2014]
36/7 can be written as 37/7
ALLOCATED: delegated entirely to specific RIR as indicated.
LEGACY: allocated by the central Internet Registry (IR) prior to the Regional Internet Registries (RIRs). This address space is now administered by individual RIRs as noted, including maintenance of WHOIS Directory and reverse DNS records. Assignments from these blocks are distributed globally on a regional basis.
does anyone really know how pure these ranges are?
And I see wilderness has jumped in with some legacy blocks
For the US i see many university blocks.
The problem with such an approach is that it is crude. It does not have the granularity to deal with reallocated ranges and subnets.
[edited by: wilderness at 11:58 am (utc) on Apr 18, 2014]
The first form is CIDR ranges. No . needed, because it's implied in the number.
It is very detailed but you can download the RIR database of every registry and see which ranges are allocated to each country.
Just spent 25 minutes looking for the LACNIC or AFRINIC versions of this data with no luck. Any clues on where to download these? I love extra data in my Alphabet soup. ;)
I have a total of 53 US IP ranges not allocated by ARIN, most of them from RIPE.
if you have world-wide expectations, as some of my own customers do, then all the above is void