I'm in the final stages to setting up DNS service on my internal networks
(home/office lan) and getting ready to drop my reliance on /etc/hosts.
I'd like to use domain names to identify what/where the network is, but
I'd rather not use things like .edu or .ac.xx (xx = some country's
abbreviation).  Are there suffixes to domain names that are reserved for
internal networks in a sense similar to the reserved IP address ranges,
e.g., 10.0.0.0 or 192.168.0.0?

If you have a recommendation on the absolutely best online page describing
how to set up DNS service on small-scale internal networks, please pass
them this way.  I could always use more references.  TIA

-- 
henry nelson