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I'd like to let the Adsense bot see them, though. I'd like to watch for the user agent - which has been posted here before - and the IP range that the bot comes from (which hasn't, yet, been posted here). If both of those conditions are met, I'll let it through to look.
Does anyone know the IP range for it? (I'll also ask Google).
I'm using GoogleStats (google it, first result) to see when GoogleBot and other spiders drop by and what pages they look at.... and I added another spider to the program's list with AdSense's info (agent, IP range, etc)... so far I haven't seen it once (my sites are pretty high traffic). I see standard Googlebot hundreds of times a day.
So perhaps some other info is needed to track it - I got the agent and IPs right out of my apache access logs though.
IP range: 184.108.40.206 - 220.127.116.11 and 18.104.22.168 - 22.214.171.124
User agent will always start: Mediapartners-Google
This bot does NOT share any information with Google's search engine - not cached info, nor telling where to visit, or anything.
Information I hope others will find useful.