NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY (NIST)
STANDARDS REFERENCE DATA (SRD)
INTERNET SERVICE SUBSCRIPTION
DEFINITION OF TERMS


LICENSE PRICING

The NIST SRD Subscription Database license pricing is based on categories of users that are either employees or students and are either full or part time. Also, the fees are based upon the number of full time employees or students at a particular licensed location.


There are the following categories:



The pricing is also based on a per-site basis. For example, if there are 9 campuses in different locations for a University, there would need to be 9 different site licenses. Also the license pricing is intended to cover not just a department but the entire campus.


INTERNET EDITION OF NIST STANDARD REFERENCE DATABASE

A SRD product specifically designed to provide the most current version of a NIST Standard Reference Database and supporting functionalities in a platform-independent modality accessible to a web browser over the Internet via the NIST SRD E-Commerces System Subscription Databases Portal.


IP Network Classes

An IP address is a 32-bit number used to identify a computer, printer, or other device on a TCP/IP network. IP addresses or sometimes called IP numbers are normally expressed in dotted-decimal format with four numbers separated by a period (.), such as 192.168.123.132. IP addresses are divided into classes with the most common being Class A, B, and C. Each class is determined by the first number in the IP address.


Class Range of First Number Number of Devices
A 1 to 126 16,777,214
B 128 to 191 65,534
C 192 to 223 254

This class list provided here is not all inclusive since there are reserved IP addresses and other class types.


IP based Authentication

As a subscriber you may optionally choose an Internet Edition of a NIST Standard Reference Database authentication method based on the IP number(s) of the computers accessing an Internet Edition of a NIST Standard Reference Database. This will allow computers with IP numbers within the defined range to access the site without the need for a user account and password. IP base authentication is subject to the following restrictions:



There are two options for specifying IP numbers and these include:

  1. A single range of IP numbers which is not larger than a class B network address. The first two numbers in the range must be the same for the beginning and end of the range. This limits the the maximum number of possible IP numbers to 65,534. (Example: 192.168 are the first two number of the previous example)
  2. Up to five ranges in which each range is no larger than a class C network address. For each range the first two numbers in the range must be the same for both the beginning and end of the range. This limits the maximum number of possible IP numbers to 1,270. (Example: 192.168.104, 192.168.105, 192.168.106, 192.168.107, 192.168.108 are acceptable from the previous example)

Registering an IP Number Range Block

In order to register an IP number range block, a range of IP numbers must be specified. This is done by specifying the endpoints of the IP number range. This is illustrated in the following examples:



Sharing of IP numbers with other groups is prohibited by the Internet Edition of a NIST Standard Reference Database license so each IP Number Range block must be used exclusively by the institution specified on the license.


For more information on the Internet Edition of a NIST Standard Reference Database IP based Authentication process please use the ContactUs links on any of the SRD E-Commerce System Subscription Databases pages.



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