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Domain Name System Structure and Delegation (RFC1591)

IP.com Disclosure Number: IPCOM000002425D
Original Publication Date: 1994-Mar-01
Included in the Prior Art Database: 2000-Sep-12
Document File: 6 page(s) / 15K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Postel: AUTHOR

Abstract

This memo provides some information on the structure of the names in the Domain Name System (DNS), specifically the top-level domain names; and on the administration of domains. The Internet Assigned Numbers Authority (IANA) is the overall authority for the IP Addresses, the Domain Names, and many other parameters, used in the Internet. The day-to-day responsibility for the assignment of IP Addresses, Autonomous System Numbers, and most top and second level Domain Names are handled by the Internet Registry (IR) and regional registries.

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Network Working Group J. Postel

Request for Comments: 1591 ISI

Category: Informational March 1994

Domain Name System Structure and Delegation

Status of this Memo

This memo provides information for the Internet community. This memo

does not specify an Internet standard of any kind. Distribution of

this memo is unlimited.

1. Introduction

This memo provides some information on the structure of the names in

the Domain Name System (DNS), specifically the top-level domain

names; and on the administration of domains. The Internet Assigned

Numbers Authority (IANA) is the overall authority for the IP

Addresses, the Domain Names, and many other parameters, used in the

Internet. The day-to-day responsibility for the assignment of IP

Addresses, Autonomous System Numbers, and most top and second level

Domain Names are handled by the Internet Registry (IR) and regional

registries.

2. The Top Level Structure of the Domain Names

In the Domain Name System (DNS) naming of computers there is a

hierarchy of names. The root of system is unnamed. There are a set

of what are called "top-level domain names" (TLDs). These are the

generic TLDs (EDU, COM, NET, ORG, GOV, MIL, and INT), and the two

letter country codes from ISO-3166. It is extremely unlikely that

any other TLDs will be created.

Under each TLD may be created a hierarchy of names. Generally, under

the generic TLDs the structure is very flat. That is, many

organizations are registered directly under the TLD, and any further

structure is up to the individual organizations.

In the country TLDs, there is a wide variation in the structure, in

some countries the structure is very flat, in others there is

substantial structural organization. In some country domains the

second levels are generic categories (such as, AC, CO, GO, and RE),

in others they are based on political geography, and in still others,

organization names are listed directly under the country code. The

organization for the US country domain is described in RFC 1480 [1].

Each of the generic TLDs was created for a general category of

organizations. The country code domains (for example, FR, NL, KR,

US) are each organized by an administrator for that country. These

administrators may further delegate the management of portions of the

naming tree. These administrators are performing a public service on

behalf of the Internet community. Descriptions of the generic

domains and the US country domain follow.

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