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Confused about the www subdomain

Is it necessary to list if it's the only one?

     
12:25 am on Nov 8, 2019 (gmt 0)

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I'm probably overthinking this but I'm a little confused when going through my Adsense panel. Every site I own has www listed as a subdomain under it in Adsense. I'm not using any other sub-domains with the sites so it seems sort of meaningless.

Now my confusion comes when going into "Blocking Controls". It will list as following:

site1.com
www.site1.com
site2.com
www.site2.com

So which one do I make the changes in if I want to block a specific ad for instance? Do I have to edit site1.com and www.site1.com? Does editing site1.com control every subdomain (www.site1.com) underneath it?

Which brings me to the main question. Can I just remove the www subdomain under "Sites"? Is it necessary if that's the only subdomain being used? I'm not sure if I added the www when I started or if it just appears normally when adding a site.

I hope that makes some sense. It's not a huge deal but a little annoying when dealing with blocking controls and some of the reports.
1:40 am on Nov 8, 2019 (gmt 0)

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My simple answer is that I assume you have everything as example.com and that your www is pointed to the non-www?

If so, someone correct me if I am wrong, then you may as well delete www.example.com

I know I did add the www in the early noughties yet deleted them since I've never used the www prefix ever, and I mean since 1993.

For some reason I recollect that in the early AdSense days that I did include the www for "whatever" registration qualification.