The database currently contains 661,079 elliptic curves in 320,449 isogeny classes, over 399 number fields of degree from 2 up to 6. Elliptic curves defined over $\mathbb{Q}$ are contained in a separate database.

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e.g. 2.2.5.1-31.1-a1 or 2.2.5.1-31.1-a