Internet Direct (Indy) Version 9.0.1 Beta
TIdIcmpClient.Host
Specifies the address used to connect to a computer.

property Host;
Description
Host identifies the address used to connect to a computer. The address can be a computer name such as "wvnvm.wvnet.edu" or an IP address such as "129.71.2.4".

To connect to a server on your machine, use IP address "127.0.0.1" aka [localhost].