Nombre de Dominio

The Hierarchy of Names

A domain name is a human-readable label that maps to one or more IP addresses through the DNSDomain Name System. The hierarchical, distributed naming system that translates human-readable domain names (e.g., example.com) into IP addresses (e.g., 93.184.216.34). Often called the "phonebook of the internet." system. Names are hierarchical, read right to left: www.example.com consists of the root (implicit), the top-level domain com, the second-level domain example, and the subdomain www. Each level is delegated: ICANN manages the root; registries like Verisign manage TLDs; registrars sell second-level domain registrations to end users; domain owners manage their own subdomains through DNS records.

Registration and Delegation

Registering a domain creates a WHOIS record at the registry and delegates authority for the zone to the registrant name servers via NS RecordName Server record. A DNS record that delegates a domain or subdomain to a set of authoritative DNS servers. Every domain must have at least two NS records for redundancy. entries at the TLD. The registrant then creates A RecordA DNS record that maps a domain name to an IPv4 address (e.g., example.com -> 93.184.216.34). The most fundamental DNS record type for resolving domain names to IP addresses., AAAA RecordA DNS record that maps a domain name to an IPv6 address. Named "AAAA" (quad-A) because an IPv6 address is four times the size of an IPv4 address., MX RecordMail Exchange record. A DNS record that specifies the mail server responsible for receiving email for a domain, along with a priority value that determines the order in which servers are tried., CNAME RecordA DNS record that creates an alias from one domain name to another (e.g., www.example.com -> example.com). The alias inherits all DNS records of the target, but cannot coexist with other record types at the same name., and TXT RecordA DNS record that holds arbitrary text data. Commonly used for email authentication (SPF, DKIM, DMARC), domain ownership verification, and other machine-readable metadata. entries to route traffic and verify ownership. DNSSEC adds cryptographic signatures at each delegation boundary, allowing resolvers to verify that records have not been tampered with — protecting against DNS SpoofingAn attack that corrupts DNS cache entries to redirect domain name lookups to a malicious IP address. Also called DNS cache poisoning, it can silently redirect users to phishing sites without changing the URL in the browser..

Lookup and Ownership Research

WHOIS Lookup retrieves the registrar, registration date, expiry date, name servers, and — where WHOIS privacy is not enabled — registrant contact information for any domain. DNS Lookup shows the live DNS records currently published for a domain. Understanding domain name ownership matters for security: attackers acquire expired or typosquatted domains to impersonate legitimate services, intercept email, or host phishing pages.