I also am having a hard time with ipaddresses. I have thousands of these to work on.

I need to change the last number from a 1 to a 0

192.62.131.1
192.62.133.1
192.62.134.1
192.62.136.1
192.62.140.1
192.62.141.1
192.62.143.1

needs to be
192.62.131.0
192.62.133.0
192.62.134.0
192.62.136.0
192.62.140.0
10.62.141.0
10.62.143.0

find .1 replace with .0 returns

192.62.031.0
192.62.033.0
192.62.034.0
192.62.036.0
192.62.040.0
192.62.041.0
192.62.043.0

Any ideas?