Examples
Writing a tutorial of this nature requires a large number of examples with hostnames and addresses in them. In order to avoid offending or inconveniencing people, we have attempted to use only names and addresses that are not in use. In most cases, we have used names and addresses that are reserved and cannot be publicly registered. In particular, this is why most of the example hosts in this tutorial are in the ".example" domain (reserved for this use in RFC 2606). In a few cases where we needed large numbers of hostnames and felt that using the reserved example namespace would be confusing, we have used names that can be registered; we have attempted to use names that are not currently registered and do not seem likely to be registered. We apologize to anybody who inadvertently uses one of these names and is inconvenienced.We also apologize to those readers who have memorized the entire reserved IP address space, and find it upsetting that many of our illustrations show reserved IP addresses in use over the Internet. This is, of course, impossible in practice, and we show it only to avoid attracting undesirable attention to addresses that can be accessed over the Internet.