Domain Name System

Domain Name System
Communication protocol
AbbreviationDNS
PurposeTo identify resources on networks
Developer(s)Paul Mockapetris
IntroductionNovember 1983 (1983-11)
OSI layerApplication layer
Port(s)53
RFC(s)1034, 1035
Internet protocol suite
Application layer
Transport layer
Internet layer
Link layer
Internet history timeline

Early research and development:

  • 1960–1962: J. C. R. Licklider networking ideas
  • 1960–1964: RAND networking concepts developed
  • 1962–1964: ARPA networking ideas
  • 1965 (1965): NPL network concepts conceived
  • 1966 (1966): Merit Network founded
  • 1967 (1967): ARPANET planning begins
  • 1967 (1967): Symposium on Operating Systems Principles
  • 1969 (1969): NPL followed by the ARPANET carry their first packets
  • 1970 (1970): Network Information Center (NIC)
  • 1971 (1971): Tymnet switched-circuit network
  • 1972 (1972): Merit Network's packet-switched network operational
  • 1972 (1972): Internet Assigned Numbers Authority (IANA) established
  • 1973 (1973): CYCLADES network demonstrated
  • 1973 (1973): PARC Universal Packet development begins
  • 1974 (1974): Transmission Control Program specification published
  • 1975 (1975): Telenet commercial packet-switched network
  • 1976 (1976): X.25 protocol approved and deployed on public data networks
  • 1978 (1978): Minitel introduced
  • 1979 (1979): Internet Activities Board (IAB)
  • 1980 (1980): USENET news using UUCP
  • 1980 (1980): Ethernet standard introduced
  • 1981 (1981): BITNET established

Merging the networks and creating the Internet:

  • 1981 (1981): Computer Science Network (CSNET)
  • 1982 (1982): TCP/IP protocol suite formalized
  • 1982 (1982): Simple Mail Transfer Protocol (SMTP)
  • 1983 (1983): (DNS)
  • 1983 (1983): MILNET split off from ARPANET
  • 1984 (1984): OSI Reference Model released
  • 1985 (1985): First .COM domain name registered
  • 1986 (1986): NSFNET with 56 kbit/s links
  • 1986 (1986): Internet Engineering Task Force (IETF)
  • 1987 (1987): UUNET founded
  • 1988 (1988): NSFNET upgraded to 1.5 Mbit/s (T1)
  • 1988 (1988): Morris worm
  • 1988 (1988): Complete Internet protocol suite
  • 1989 (1989): Border Gateway Protocol (BGP)
  • 1989 (1989): PSINet founded, allows commercial traffic
  • 1989 (1989): Federal Internet Exchanges (FIX East|FIXes)
  • 1990 (1990): GOSIP (without TCP/IP)
  • 1990 (1990): ARPANET decommissioned
  • 1990 (1990): Advanced Network and Services (ANS)
  • 1990 (1990): UUNET/Alternet allows commercial traffic
  • 1990 (1990): Archie search engine
  • 1991 (1991): Wide area information server (WAIS)
  • 1991 (1991): Gopher
  • 1991 (1991): Commercial Internet eXchange (CIX)
  • 1991 (1991): ANS CO+RE allows commercial traffic
  • 1991 (1991): World Wide Web (WWW)
  • 1992 (1992): NSFNET upgraded to 45 Mbit/s (T3)
  • 1992 (1992): Internet Society (ISOC) established
  • 1993 (1993): Classless Inter-Domain Routing (CIDR)
  • 1993 (1993): InterNIC established
  • 1993 (1993): AOL added USENET access
  • 1993 (1993): Mosaic web browser released
  • 1994 (1994): Full text web search engines
  • 1994 (1994): North American Network Operators' Group (NANOG) established

Commercialization, privatization, broader access leads to the modern Internet:

  • 1995 (1995): New Internet architecture with commercial ISPs connected at NAPs
  • 1995 (1995): NSFNET decommissioned
  • 1995 (1995): GOSIP updated to allow TCP/IP
  • 1995 (1995): very high-speed Backbone Network Service (vBNS)
  • 1995 (1995): IPv6 proposed
  • 1996 (1996): AOL changes pricing model from hourly to monthly
  • 1998 (1998): Internet Corporation for Assigned Names and Numbers (ICANN)
  • 1999 (1999): IEEE 802.11b wireless networking
  • 1999 (1999): Internet2/Abilene Network
  • 1999 (1999): vBNS+ allows broader access
  • 2000 (2000): Dot-com bubble bursts
  • 2001 (2001): New top-level domain names activated
  • 2001 (2001): Code Red I, Code Red II, and Nimda worms
  • 2003 (2003): UN World Summit on the Information Society (WSIS) phase I

Examples of Internet services:

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 Internet Protocol (IP) networks. It associates various information with domain names (identification strings) assigned to each of the associated entities. Most prominently, it translates readily memorized domain names to the numerical IP addresses needed for locating and identifying computer services and devices with the underlying network protocols.[1] The Domain Name System has been an essential component of the functionality of the Internet since 1985.

The Domain Name System delegates the responsibility of assigning domain names and mapping those names to Internet resources by designating authoritative name servers for each domain. Network administrators may delegate authority over subdomains of their allocated name space to other name servers. This mechanism provides distributed and fault-tolerant service and was designed to avoid a single large central database. In addition, the DNS specifies the technical functionality of the database service that is at its core. It defines the DNS protocol, a detailed specification of the data structures and data communication exchanges used in the DNS, as part of the Internet protocol suite.

The Internet maintains two principal namespaces, the domain name hierarchy and the IP address spaces.[2] The Domain Name System maintains the domain name hierarchy and provides translation services between it and the address spaces. Internet name servers and a communication protocol implement the Domain Name System. A DNS name server is a server that stores the DNS records for a domain; a DNS name server responds with answers to queries against its database.

The most common types of records stored in the DNS database are for start of authority (SOA), IP addresses (A and AAAA), SMTP mail exchangers (MX), name servers (NS), pointers for reverse DNS lookups (PTR), and domain name aliases (CNAME). Although not intended to be a general-purpose database, DNS has been expanded over time to store records for other types of data for either automatic lookups, such as DNSSEC records, or for human queries such as responsible person (RP) records. As a general-purpose database, the DNS has also been used in combating unsolicited email (spam) by storing blocklists. The DNS database is conventionally stored in a structured text file, the zone file, but other database systems are common.

The Domain Name System originally used the User Datagram Protocol (UDP) as transport over IP. Reliability, security, and privacy concerns spawned the use of the Transmission Control Protocol (TCP) as well as numerous other protocol developments.

  1. ^ Wu, Hao; Dang, Xianglei; Wang, Lidong; He, Longtao (2016). "Information fusion-based method for distributed domain name system cache poisoning attack detection and identification". IET Information Security. 10 (1): 37–44. doi:10.1049/iet-ifs.2014.0386. ISSN 1751-8717. S2CID 45091791.
  2. ^ J. Postel, ed. (September 1981). INTERNET PROTOCOL - DARPA INTERNET PROGRAM PROTOCOL SPECIFICATION. IETF. doi:10.17487/RFC0791. STD 5. RFC 791. IEN 128, 123, 111, 80, 54, 44, 41, 28, 26. Internet Standard 5. Obsoletes RFC 760. Updated by RFC 1349, 2474 and 6864.
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