abiather:
Now when you said: “All of them were coming from the same ISP,” now understand what may have happened. I was transferred to my Head-Office last month. And nature of my work also somewhat changed. To avoid virus problem, I put a requisition for a second computer exclusively for net-related work. Office gave me an old computer. I am posting from this computer as I have somewhat relaxed schedule. I don’t know who was using this computer before me in this company of over 3000 people!
You, sir, are a liar. (And not a very good one.)