Q: Cannot access intranet websites on my Macbook, but can access them using my iPhone in the same network?!?

I'm having trouble accessing certain websites, like my Intranet sites, apple.com, etc. when I ping these websites I get the proper response.

But I'm able to access websites like google, facebook.

I was using Lantern before I started facing this problem.

Can someone please help me?

Macbook Pro (Retina, 15-inch, Mid 2015)

OS - Yosemite