Providing on-line computerized databases in the field of computer network address management services that enables users to reserve, block and use computer network addresses and to search, block, access, add, modify or delete information relating to computer network addresses; computer services, namely, providing search engines for obtaining data on the internet; providing temporary use of on-line non-downloadable software for blocking, registering and tracking domain name addresses on the internet; providing customized domain name searching service, namely, conducting online computerized searches for the availability of desired domain names to be determined at the specific request of end-users by means of global computer networks; computer software development for third parties in relation to domain name; reserving and blocking domain names for others, namely, providing computer servers for electronic storage of domain name addresses; and domain name monitoring services, namely, legal services in the nature of monitoring second level domain names chosen by domain name registrars that contain a match of a term that the customer has as an approved mark in the trademark clearinghouse