Yes, forget about Web Dewey, now you can find the DDC numbers over the web by other means also.
For Both Dewey Decimal Classification Number and Library of Congress Classification Number
1. Go to: http://isbndb.com/
2. Enter the title that is in your library and search.
3. Click on the most relevant title under the heading of "Books Matching ('your enter title')".
4. Consult the "Dewey Class:" or "LCC Number:" under "Classification:" Heading. This is your classification number you are looking for.
If you don't find the Heading "Classification:" or You find the Heading
"Classification:" but don't find the "Dewey Class:" or "LCC Number:" then again
5. Click on any appropriate title under "Libraries this book has an entry in:".
5. Now under the "MARC Record" see against: 092: $a: or 082. This is your classification number you are looking for.

For DDC Numbers You can also consult:

1. http://www-lib.nearnorth.edu.on.ca/dewey/ddc.htm (Dewey Decimal Classification System (13th Abridged))

2. http://www.oclc.org/dewey/resources/summaries/default.htm

3. http://www.deweybrowse.org/

Courtesy: Lis Links

--
Vimal Kumar V.
Asst. Librarian
Asian School of Business
Technopark, Trivandrum-695 581
Web: www.asb.edu.in/vimal/
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"I forget what I was taught. I only remember what I have learnt"
-Patrick White