How to know the Website built On SharePoint and get the Version Number also

To figure out what technologies a site is built on :

A- General Ways.

B- Reading HTTP Response Header.

C- Specific For SharePoint , Using Service.

A- In General, To figure out what technologies a site is built on :

     - You could easy look at,  URLs, and file extensions like (Aspx, php, etc.)

     - View Html Source Code, to check Some special Keywords.

     - Using Tools like, https://builtwith.com/

B- Reading HTTP response headers :

The most effective way to do this job , by reading the http response header of the web site using something like Fiddler , PostMan, etc.

You will get plenty of information about the web site ,

Example using PostMan :

You can see the SharePoint version 15 , that is mean SharePoint 2013,

SharePoint version list :

SP 2007: microsoftsharepointteamservices: 12

SP 2010: microsoftsharepointteamservices: 14

SP 2013: microsoftsharepointteamservices: 15

C- Specific For SharePoint , Using Service: 

http://mydomain/_vti_pvt/buildversion.cnf

OR

http://mydomain/_vti_pvt/service.cnf

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