Need help with the following:

I HAve colums with Ip addresses can be random and want to add in next column the location of IP address .
eg


10.70.60.10
10.70.50.25
10.70.50.26 etc

then run a macro that will add in the next colums the location

10.70.60.10 Building A
10.70.50.25 Building B
10.70.50.26 Building B etc

Thanks