|Class Group Database|
A Database for Class Groups of Number Fields
This site contains a database of more than 100,000,000 class groups of number fields calculated using pari/gp, KANT and GAP. With Tables you may select the Content you are interested in. There you will also find more detailed information about the format of the specific tables.
At the moment there are tables for number fields of small degree, sorted by Galois group, and for number field towers over real quadratic fields.
Some searches request gzip files. Under windows you can use gzip to unzip them.