DomainTools
A leading provider of domain name research and monitoring services. DomainTools offers WHOIS history, reverse WHOIS lookups, and other intelligence tools used by domain investors, brand protection teams, and cybersecurity professionals.
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Browse More Terms
Subdomain
A prefix added to a domain, like blog.example.com. Created free by the domain owner, no registration required.
Domain Lease
An arrangement where a domain owner allows another party to use a domain name for a recurring fee without transferring ownership.
DNS
Domain Name System
.BIZ
A generic extension launched in 2001 as a .com alternative for businesses. It never earned the respect, and the aftermarket is thin.
DR (Domain Rating)
A metric developed by Ahrefs that measures the strength of a domain's backlink profile on a scale from 0 to 100.
Aged Domain
A domain name that has been registered for an extended period, typically several years or more.