When you visit a web site, your browser sends various pieces of information to that site. One of them is your IP address (because the server needs it in order to send you the web page you requested). There's a handy site at https://www.whatismyip.com/ which simply echoes this information back to you, which is a really quick and easy way to find out your real IP address.
This can be useful if you're working in an unfamiliar location and you want to know the IP address of the computer you're using, for example. But remember that the result will be the IP address of the router through which your computer is connected to the internet, which probably won't be the same as the one your computer uses internally on the LAN.
The site also tells you a few useful facts about the IP address you're using, such as which company it's registered to. This is handy for checking that your VPN, if you use one, is working correctly.
In a similar vein, here's a web site which tells you your current screen resolution setting. It's a really quick way to check, for example, whether your settings meet the requirements of a program or game that you want to install. Just head to http://www.whatismyscreenresolution.com/ for an instant notification right in your browser, with no need to install or download anything.
So next time you want to install a new game, but the web site says it won't work with displays of less than 1024x768, you'll know precisely how to check that your computer is OK.
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Thanks Rob!
Screen Resolution, OK.
IP address OK, country OK, ISP OK. Two mistakes: state and city 150 km away.
Regards
Peter.
That screen resolution site returns bizarre results for me, YOU ARE USING 1707 x 960, YOU ARE USING 1423 x 800, You are using 1413 X 795, You are using 1173 X 660, four browsers, four wildly inaccurate results.
If you really need to know, although I'm not really sure why you'd need to, right clicking the desktop and left clicking Screen Resolution gives rather more accurate information. Sorry, that needs two clicks...
I get the same problem:
The main reason for this is that the Javascript used by whatismyscreenresolution.com is notoriously (perhaps infuriatingly would be a better word) unreliable at detecting screen resolutions correctly and gives inconsistent results across all the main web browsers.
Here's one discussion of some of the issues:
http://stackoverflow.com/questions/2242086/how-to-detect-the-screen-resolution-with-javascript
Here's another site that displays more detail but still gets it wrong too:
http://www.javascriptkit.com/howto/newtech3.shtml
What complicates this is stuff like zooming. In Windows we also have desktop scaling for higher resolution screens so everything doesn't appear too small. Instead of showing everything at normal size 100%, text, icons and other desktop elements are magnified. 125% is the most common magnification which just happened to be the ratio that is the difference between my actual screen resolution and that displayed by whatismyscreenresolution.com
By removing the Windows scaling, I can get the correct scaling on my main screen - hooray
! But then the second screen resolution is often displayed incorrectly instead - boo 
!
I can see the usefulness of "https://www.whatismyip.com", both for those, as you stated, that use a VPN and because many ISP's change their customers IP, from time to time, to protect their anonymity, but "http://www.whatismyscreenresolution.com" not so much because most experienced computer users, which I assume is the large percentage of your user base, already know their native screen resolution. I can see it for new computer users and most wallpaper sites automatically inform the user, up front, what size wallpaper they need.