Does anyone know who the IP http://122.181.150.52 belongs to? I had it serving some Google Adsense ads of mine, but since I only allow approved sites/ addresses to serve my ads it was blocked. When I visit the site it goes to a simplified login screen with a "MindTouch" logo at top left.

Anyone ever heard of this? I'm going to hold off on letting them serve my ads until I learn more...

Is there a limit to the number of ad units I'm allowed to create in my Google Adsense account? I can't seem to find the answer in Google support forums. I recall they're being a limit when I first signed up, but now I don't see one.

The reason I ask - I'm testing different ad units, and therefore am creating many of them. I don't see a "delete" option so am simply "hiding" the ones that I don't use anymore.

Has Google done away with PSA (Public Service) ads? I remember you used to be able to choose to fill an ad space, in the event that no ad was available to show, with either a solid color, a link to another ad, or a public service ad.

The public service ad option appears to have disappeared. Any ideas?

I'm in the new Adsense interface and I can't for the life of me figure out how to create a new custom color palette? If I switch back to the old interface it works fine, but not even in the Help Center do I find any indication of where the color palettes are under the new interface...

I can't seem to find the answer to this in the Adsense TOS - am I allowed to place Google Adsense ads on 404 not found pages? The pages actually do contain content, not just a "404 page requested not found" message. Then again, all the 404 pages are the same (ie. they're not unique), so I'm on the fence on this one and obviously don't want to get in trouble with Google...

I'm taking a look at all the different ad provider options I have as a publisher. It's too bad Adsense does not have more competition, as they seem to have a stranglehold on the market (after Yahoo dropping their YPN program and Microsoft closing PubCenter to new publishers).

Does anyone know what percentage of your revenues Adsense keeps?

Does anyone have a website layout template that is optimized for Adsense? Ie. that has the ad blocks in the best positions to optimize CTR and PPC?

What is a good Adsense CTR? I'm currently averaging 1.14% on one site, 1.35% on another, and a measly 0.80% on a third. Is there some kind of average I should be comparing myself to? My sites get over 100k uniques/ month.

Where is the allowed sites section that used to be under Adsense Setup > Allowed Sites? This section is important. First, because I have it turned on and need to be able to allow new sites. But initially because I don't want unauthorized sites showing my ads and potentially getting me in trouble. Therefore I only authorize sites that I recognize (such as Google language sites) or run myself to serve my Adsense ads.