Updated : September 2015
The data which we have is quite old and therefore needs revision.
As of September 2015 the Total Number of Websites on Earth is 892,743,625 or 892 Million Websites.
This data is taken from NetCraft September Web Server Survey.
Apache is still powering more than 34% of the total websites on earth, while Microsoft IIS is powering around 29%. The nginx powered websites are around 15% of total websites while in 2008 it was less than 1% of the total websites being powered.
Have you ever wondered that what the total Number of Websites on Earth is? Well, according to the Netcraft data, the total number of websites on earth as of January 2009 is 185,497,213 (185 million).
This data includes both blogs and websites. The number of blogs hosted by Google (BlogSpot) is about 5.6 % (10,455,103) of total websites.
Another important data is that the Web has lost about 1.23 million websites between Dec 08 and Jan 09.