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Classification Web

Web access to LC Classification and LC Subject Headings

Click here for Order Form

Subscription Prices | Product Features | Class Web FAQs | Quick Tips |
Quick Start Tutorial | Register for a Trial Account | Class Web Home Page

Subscription Prices

Solo User: $325

You receive:

  • username and password access (no site restrictions)
  • single personal notes file
  • 20 hours of access per month

Concurrent Users per site*

1 to 4 concurrent users: $ 525
up to 9 concurrent users: $ 640
up to 14 concurrent users: $ 775
up to 19 concurrent users: $ 910
up to 24 concurrent users $1,320
up to 29 concurrent users: $1,825
30 or more concurrent users call CDS

You receive:

  • Unlimited connection time for maximum number of concurrent users.
  • One local notes file per account.
  • Three types of access:
    1. Account manager username and password (has the ability to edit notes and set account display preferences).
    2. Site IP address: set up a range of computers at your site.
    3. One read-only password for site users not connected to a local LAN.

* site is defined as a contiguous geographical location. ( Click here for a brief description of a site .)

Advantages of Classification Web:

  • Full-text schedule display of all Library of Congress classification schedules--including G class geographic cutters.
  • Complete Library of Congress subject headings in familiar thesaurus-style display.
  • Access to data anywhere you have a World Wide Web connection.
  • Correlations between LC classification numbers and LC subject headings.
  • All files updated daily, providing optimal data accuracy.
  • Hypertext links within and between classes and subclasses speed access to critical data.
  • Powerful search & navigation tools.
  • Automatic calculation of classification table numbers.
  • Permanent institutional or personal notes file.
  • Ability to link to local Web OPAC for many major vendor systems.
  • Preset list of institutional OPACs to which users can link.
  • Display of non-Roman characters.

What Users Say About Classification Web

"Classification Web is easy for copy and original catalogers to use. I think it would prompt more consistent assignment of subjects and class numbers. Its speed and correlations speed up the decision-making process."
-----Shelby E. Harken, University of North Dakota

Class Web at - March 7, 2005

On March 7, 2005 the production version of Classification Web moved to a new server hosted by an off-site commercial service. The reason for the move was to enhance reliability of service and to take advantage of expanded server support.

What this means for customers:

  1. For optimal access use the following URLs:
  2. For optimal compatibility with your workstation check to make sure your system will accept "cookies" from
    Some computer workstations block "cookies" from unknown sources. To avert possible access problems, make sure the privacy status on your Internet browser is set at "Medium" and that your firewall (if you have one) is set up to accept cookies from
  3. To communicate with CDS regarding Class Web access issues, use the new support email address of
  4. Enjoy the increased reliability and speed of access!

LC/Dewey Correlations

Through the courtesy of a cooperative agreement with OCLC Online Computer Library Center, Inc. (OCLC), the Cataloging Distribution Service (CDS) offers access to the following correlations with Dewey® classification numbers in Classification Web:

LC Subject Headings - Dewey Classification Numbers
LC Classification - Dewey Classification Numbers

With this feature, users can enter a Dewey classification number and display a list of matches to LC subject headings or LC classification numbers as they have been applied in LC bibliographic records.

Subscribers to OCLC's WebDewey service can also link between products to obtain the most up-to-date Dewey classification data. For information on how to subscribe to WebDewey, check OCLC's Web site at

Dewey and WebDewey are registered trademarks of OCLC Online Computer Library Center, Inc.

Classification Web FAQs

Purchasing Classification Web
How to Register for a Trial Account
Classification Web End-User Agreement Questions

Setting up Your New Class Web Account

Quick Tips

Purchasing Classification Web

1. How do I purchase a subscription to Classification Web?

  • New vs. renewing subscribers:
    • New subscribers, those interested in a trial account, and renewing subscribers who have allowed their previous subscriptions to lapse for over two months, must fill out the Class Web order form. A one-time, click-through acceptance of the Terms and Conditions is required to access new, late renewal, and trial accounts (see the end-user agreement section).

    • Subscribers renewing active Class Web subscriptions only need to complete the Class Web Order Form and are not required to complete the end-user agreement process a second time. Renewing subscribers may ignore references to the end-user agreement in the information below.

  • How do I get the order form and, if a new subscriber, a copy of end-user agreement?
    You may download both the order form and Terms and Conditions end-user agreement from the CDS Web site at or call CDS to have those documents faxed to you.

  • How do I return my order to CDS?

  • For renewing subscribers, new subscribers, and those applying for trial accounts:
    1. If paying by credit card, deposit account or for free trial account, fax the order form to CDS (for fastest service).
    2. For all other forms of payment, mail the order form and payment to CDS via private courier service (Federal Express, DHL, UPS, etc.).

2. Can I get a trial account?
Yes, you can get a trial account; details are below.

  • How do I sign up for a trial account?
    To sign up for a trial account you must still complete the application form and fax or express mail it back to CDS. You will then receive an email with your username and password.
  • How long will a trial account last?
    Trial accounts will last for one month and you will be prompted every two weeks that the account is about to expire and you will be given instructions on how to place an order.
  • What type of account will a trial account be?
    A trial account will be equivalent to a 1-4 concurrent users account. Solo users can just use the username and password supplied to you. Site users will have the opportunity to set up a range of IP addresses to get an idea of how that works.
  • What if I don’t want to bother with getting a trial account, but still want to get an idea of how the product works?
    You could look at Class Web’s Quick Start Tutorial that is accessible from the product’s Web site at A username and password is not required for accessing the tutorial.

3. I want to purchase access for several concurrent users, but my site does not have its own local IP address. We use an outside service provider such as AOL or Can I still take advantage of the lower total cost available with the concurrent user account?
Yes, you can use a concurrent user account even if you do not have a local IP address. Your users could use the Account Administrator username and password which would give all of them access to local notes and globally change preferences or non-administrative users could use the read-only password.

4. What do I do if I sign up for a Solo User account and I end up needing more than 20 hours of access a month?
To get more than 20 hours of access a month you will need to purchase a 1-4 concurrent users account. That gives you unlimited access for your subscription period. To change account type you must contact Customer Support and have them start a new subscription for you for 1-4 concurrent users. Your Solo User subscription will be prorated for the remaining months you have on that subscription and credited to the purchase of your new subscription.

5. What do I do if I signed up for a 1-4 concurrent users subscription and I end up needing more concurrent users than that?
Same procedure as in 4. above.

6. I frequently have a number of browser sessions open when I am using a product such as Class Web. Does each browser session count as a concurrent user?
No, extra browser sessions do not count as extra concurrent usage. Concurrent usage of Class Web is calculated by the IP address (i.e., the number of separate computers you have logged on).

7. I have users at my site who like to leave their workstations without logging off. Will this affect the concurrent user count on my site?
Class Web is currently configured to log users off automatically after one hour of inactivity. Encouraging users to log off when they are finished with the product is definitely to your advantage in optimizing product usage, but negligent users will not inhibit access for longer than a half-hour.

8. I am interested in a solo user account. If I forget to log off my account, is the time after I finished working counted as part of my 20 hours?
No, for solo users the clock stops ticking at the time the last transaction is performed. You don’t lose time by forgetting to log off.

9. Will I be able to create a link from Class Web to my Web OPAC?
During the Pilot test CDS was able to successfully link to INNOPAC and Voyager Web OPACS. Both GEAC and The Library Corp. have indicated they will supply CDS with the coding necessary to create links for their systems. If you have another OPAC system which has a LC classification search option in its Web interface, you may also be able to create links between Class Web and your system.

10. Is there a library school/educational discount offered for Class Web?
No, a discount will not be offered. In the past CDS has offered outdated copies of CD-ROMs for educational purposes, but Class Web is never out of date. Library schools may wish to coordinate with their campus libraries to share concurrent user access.

11. Is it possible for a library consortium to purchase one concurrent user account for all members of the consortium.
No, each library in a consortium will need to purchase it's own account to Class Web. The technical complexities of setting up IP address access and the fact that each account only receives one set of institutional notes, makes having one account per institution the most sensible to administrate and the most fair to all purchasers.

12. Is Class Web available as part of the CDS Dealer Program?
No, CDS does not plan to offer Classification Web as part of its Dealer Program. The complexities of administering a Web subscription product makes such an approach unfeasible.

Class Web End-User Agreement Questions: Click here for complete text of the agreement.

1. What constitutes a site for Class Web?
Public Library Site: is defined by geographic/service area and is limited to a single main library and its branches (i.e., libraries under a single director/board of trustees). Authorized Users are limited to current library staff and library patrons accessing the service while in the library or at authorized remote access.

Academic Library Site: is limited by geographic site and Authorized Users. Each geographically distinct campus shall be treated as a separate site for purposes of the Service. Adjunct facilities to a campus may be considered part of an Academic Library Site if they are under a single integral institution with one billing address and are part of a single student admissions program. An Academic Library Site does not include a consortium of libraries, multi-campus institutions, shared local systems, statewide networks, or secondary relationships with shared facilities. Authorized Users at academic institutions are limited to current faculty and staff, currently enrolled students, and authorized patrons of the Subscriber's library, who are primarily affiliated with the licensed campus. On-site and Remote Access are permitted.

Special Library Site: is limited to a single corporate or other special library (e.g., a law firm library). A separate subscription is required for each geographically distinct operational entity. Authorized users are limited to current employees or patrons who are served by the special library. On-site and remote access are permitted.

2. If I have a site account can I access Class Web at a location remote from my site?
Yes, but under specific limitations.

  • Option 1. “Virtual” site access.
    Optimal means for remote access is using a “virtual URL” through which users access the site as though they are using the locally designated range of IP addresses. Many universities offer this type of access to full-time students. Check with your site systems administrator to see if this type of “virtual URL” access is available at your institution.
  • Option 2 Read only password.
    Each site account will receive one read-only password. The access would typically be used by individual staff members who need access from somewhere on the site that is not connected to the site’s established IP range (e.g., the established IP range is the main library’s cataloging division and someone in the biology library also needs access.) Because there will be only one read-only password, this access should be used sparingly.
REMEMBER in either of these scenarios, off-site users MUST be primarily associated with the site (see above) and whoever is accessing a site, WILL BE COUNTED as one of your concurrent users.

3. My campus has a few faculty and staff who are housed at a short distance from the school's primary location. Would these people be allowed to access Class Web using our site account?
Yes, if these individuals are full-time students, faculty, or staff of your specific campus, they may access your site account either by a virtual URL or using your read-only password. If they are in fact primarily independent agents or associated with another institution, they need to obtain access through that other institution or purchase a separate subscription.

4. My organization requires a hard copy of the Terms and Conditions for our files. What do I do?
Print two copies of the Terms and Conditions. Sign and fax or mail them to CDS. CDS will counter-sign both and return one to you.

Setting up your New Class Web Account:
For a PDF version of this setup information check

Once your institution has completed the click-through agreement and you have received your username and password for Class Web, you will want to set up your account. Below is a brief list of procedures to facilitate this process. Additional information is available both on the "Preferences" screen in your Class Web account and in the Class Web "Help" file.

Signing on to Class Web and Accessing Preferences
Managing Web Opac Links and Options
Setting up Read-only Password and IP Address for Automatic Logon
Setting up your users to Access Class Web

1. Signing on to Class Web and changing your password.

  • Go to URL
  • Click on the "Log On" button.
  • Click on any link.
  • You will be prompted to input your username and password.
  • Before inputting your username and password, click on the box below the input boxes that says "Change password" and follow the on-screen prompts.

Note: While you may change your password, your username can only be changed by CDS.

2. How to access your "Preferences" screen to modify product functions

  • Go to URL
  • Click on the "Log On" button.
  • Click on the "Preferences" link found just below the "Subject Headings and Classification Number Correlations" menu option toward the bottom of the screen.
  • You will be prompted to input your username and password.
  • You will then view the "Preferences" screen.

    [Note : Changes made in the "Preferences" screen will affect everyone using the account.]

3. Adding or changing administrative users' email addresses.

The email addresses listed in "Basic Information" are those that you specified in your Class Web order form. Every email address listed will receive administrative account information including usernames and passwords. Should you wish to change email recipients at any time during your subscription period, you may change them here.

4. Creating Web OPAC links

The OPACs listed on your "Preferences" screen represent those institutions that agreed to have a predefined link created for their OPACs. Class Web is preset to display all these links when you click on the "B" bibliographic link that follows classification numbers displayed in the Class Web screens. You may leave your OPAC links option set at "All" or choose among the listed OPACs for the ones to which you would routinely like to link. Leave all boxes blank if you choose not to link to any of these OPACs.

5. Creating locally defined OPAC links.

This set of boxes enables you to establish a link to the Web interface for your local OPAC. In the pilot test CDS was able to successfully link from Class Web to the INNOPAC and Voyager OPACs. It may also be possible to link other Web OPACs that have the ability to search LC classification numbers.

  • Preliminary assessment of URL for Web OPAC link.
    • Check to see if the Web OPAC to which you wish to link provides an LC classification number search by using just the URL. If that is not the case, you will not be able to create a link to Class Web.
    • If your Web OPAC does include a URL-generated LC classification number search, perform a simple classification search such as HF1001on the OPAC. Look at the URL address that is generated at the top of your browser screen. For linkable OPACS, usually everything before the classification number in the URL is the "URL prefix" and anything after the classification number is the "URL suffix."
  • Inputting required information into Class Web.

    OPAC Name
    Input the name you want displayed by Class Web when linking to this OPAC.

    URL prefix
    Input the beginning portion of the URL that is required to run a classification number search (see "preliminary assessment" above) including "http://" at the beginning of the string.

    URL suffix
    Input the string that is appended after the classification number in your OPAC search.

  • Specific instructions for linking to an INNOPAC Web OPAC.
    Using the Bowling Green University Web OPAC as an example, if you do a classification search for HF1001, it will display the following URL:

    The URL prefix in this case is

    There is no "URL suffix" required when configuring an INNOPAC system.

    To set up your OPAC, substitute the equivalent prefix from your own OPAC search.

    • Specific instructions for linking to a Voyager OPAC.
      Using the Cornell University Web OPAC as an example, if you do a classification search for HF1001, it will display the following URL: Pwebrecon.cgi?SC=CallNumber&CNT=25+records+per+page&SA=

      The URL prefix in this case is: Pwebrecon.cgi?SC=CallNumber&CNT=25+records+per+page&SA=

      The URL suffix is : &HIST=1

      To set up your OPAC, substitute the equivalent prefix and suffix from your OPAC search.

    6. Subject Headings Option, Display Option, and Classification Browser Option

    See the "Preferences" screen for the available options. Remember that the choices you make in these areas, as with all other options, will affect all users of your account.

    7. Read-only password.

    Input here the password you wish individuals without administrative authorization to use.

    Individuals who use the read-only password will notbe able to change any account settings or create notes. For sites that offer IP address access, the read-only password access is a good option for individuals who need access to Class Web but are not in the IP address range. This password should be used sparingly, however, to prevent unauthorized users from taking up available concurrent user access. Any password changes will notbe sent to non-administrative users automatically.

    8. Setting up IP addresses for Automatic Logon.

    Customers with site accounts who wish to set up workstations that do not require entering a username and password for access will need to set up IP addresses ranges here.

    Some simple scenarios for setting up IP address ranges.

    • Check the IP address displayed at the bottom of your "Preferences" screen. That is the IP address for the workstation you are using. For example, say that number is
    • Your institution's IP address is likely to be represented by all or part of the numbers in that address.
    • If you are a very small site with a single IP address shared by several workstations, you would enter the whole IP address number
    • If you are a somewhat larger site, you may want the IP addresses in the last portion of the address string to have access. To do that you would input the number
    • If you are a very large site, you may want the IP addresses for the last 2 portions of the IP address to have access to Class Web. In that case you would input the number
    • If you are not sure of the IP address ranges that you wish to have access, or you wish to limit access to subgroups of the ranges listed above, check with your system's administrator.
    • Those institutions that have several IP addresses at one site have the option to input more than one IP address range.

    9. Setting up your users to access Class Web .

    • Administrative users - Require username and password that was sent with the account.

    Their URL for access is

    (These users will be able to change account preferences and create notes for the account.)

    • Read-only password users - Must have the username that came with the account and the read-only password created by an administrative user.

    Their URL for access is:

    • Users of IP address-based automatic logon - No username and password is required, but their workstation must be included in the range of IP addresses set up in the account's "Preferences" screen. Their URL for access is: http://classificationweb/Auto/

    Available from the Cataloging Distribution Service, Library of Congress |