Semi-OT :How Do I Know If My ISP Is Blocking Pages?

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I have no idea where to go with this question -- and would be happy
bring it elsewhere if someone can recommend the right venue.  I read
this group all the time, though, and know there are some tech-heads

There are some Web pages that I can't see from my computer. yet other
friends can see these from their computer.  I have no idea why, and
ISP, Verizon, is no help.

I did some research into Proxy servers and found that when I used
proxy I can see the pages:
However, these people make you pay, and it's a bit ridiculous that I
can't see some basic pages! Anyone have any idea why this would be?

Thanks in advance.

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