How many ISPs are out there?

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1

well, once upon a time.... you weren't really considered an "ISP"
unless you were able to play the BGP game. So an ASN once was an
hallmark of an I{A,S}P. Things change so I expect it is much harder
to figure out, externally, what an I{A,S}P is than it used to be.
I still use the ASN token as a discriminator. YMMV

2

Unless the network is lying to me again, bmanning@vacation.karoshi.com said:

well, once upon a time.... you weren't really considered an "ISP"
unless you were able to play the BGP game. So an ASN once was an
hallmark of an I{A,S}P. Things change so I expect it is much harder
to figure out, externally, what an I{A,S}P is than it used to be.
I still use the ASN token as a discriminator. YMMV

Additionally, you need to subtract out the ones that have gone out of
business. I was looking thru the ASN list and right off the top found
about 5 that I recognized as defunct within the first 5000.

(ok, ok, 5 / 5000... maybe you don't need to subtract them out after all)

AlanC {stunned that we just got an ASN in the 2xxxxx range}

3

Unless the network is lying to me again, Alan Clegg said:

AlanC {stunned that we just got an ASN in the 2xxxxx range}

Uh... 2x,xxx not 2xx,xxx. It's WAY to early in the AM.

AlanC

4

There are 11,358 AS's currently announced in the BGP table in my neck of the woods
(http://www.telstra.net/ops/bgp/bgp-as-count.html)

Other folk see 11,332 (AS 286) and 11,330 (AS 818).

The highest AS number being announced at present is AS21949