Does anybody know how to find out the ISP/remote host (i.e. 123.123.123.123.dialup.eisg.net)?

I use apache on a windows machine, not iis or etc. I can't run xml or asp.

Is there an easy way to do do this?

I want to find out what there ISP/remote host is and then display just the last part( i.e. eisg.net).