1. A method, comprising: receiving from a client, using at least one computer, a request to register an expression defining a set of second level root domain names as associated with one or more IP addresses in a domain name system for a wide area network, wherein the expression is defined by one or more ASCII characters and one or more wildcard or other pattern-matching symbology, and wherein the set of second level root domain names includes more than one unique second level root domain member; evaluating the request using at least one computer, thereby determining registrability of the set of second level root domain names based on the expression including the one or more wildcard or other pattern-matching symbology; reporting results of evaluating the request to the client, wherein the report includes information identifying any member of the set of second level root domain names that is already registered in the domain name system; preparing an modified expression by adding a term that specifically excludes at least one member of the set of second level root domain names that is already registered in the domain name system; and registering the modified expression defining the set of second level root domain names, the modified expression including the one or more wildcard or other pattern-matching symbology in a data file of the domain name system in association with the one or more IP addresses.