Managing Hostnames and IP Addresses
Mac OS X 10.1 (and earlier versions of Mac OS X) only consulted /etc/hosts in single-user mode and stored hostname/IP address mappings in the /machines portion of the NetInfo database. As of Mac OS X 10.2, you can use the /etc/hosts file to map hostnames to IP addresses. For example, the following entry would map the hostname xyzzy to 192.168.0.1:
192.168.0.1 xyzzy
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