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The Domain Name System (DNS) is a hierarchical and distributed name service that provides a naming system for computers, services, and other resources on the Internet or other IP networks. It uses the DNS protocol, which specifies the data structures and data communication exchanges used in the DNS, and runs over UDP or TCP.
A name server is a computer application that provides responses to queries against a directory service. Learn about the different types of name servers, such as authoritative, recursive, and caching, and their roles in the Domain Name System (DNS) of the Internet.
A top-level domain (TLD) is one of the domains at the highest level in the hierarchical Domain Name System of the Internet after the root domain. Learn about the history, types, and management of TLDs, including country-code, generic, and internationalized domains.
Learn about the different types and categories of top-level domains (TLDs) in the Domain Name System of the Internet. See the list of 1502 TLDs, including generic, country code, infrastructure, and test domains, with their names, entities, and notes.
Learn about the File Transfer Protocol (FTP), a standard communication protocol for file transfer between a server and a client. FTP uses two ports: 21 for control and 20 for data, and can run in active or passive mode depending on the network configuration.
dig is a command-line tool for querying the Domain Name System (DNS) for network troubleshooting and education. It supports Internationalized domain names, various output formats, and is part of the BIND software suite.
A DMZ or demilitarized zone is a subnetwork that exposes an organization's external-facing services to an untrusted network, such as the Internet. Learn how a DMZ works, what services it can host, and how it differs from a proxy server or a reverse proxy server.
Multicast DNS (mDNS) is a zero-configuration service that resolves hostnames to IP addresses within small networks. It uses IP multicast UDP packets and is compatible with standard DNS servers. Learn about its history, protocol overview, packet structure and related concepts.