Vishnupurana 1.21.22

1.21.22

elāputras tathā nāgaḥ karkoṭakadhanaṃjayau
ete cānye ca bahavo dandaśūkā viṣolbaṇāḥ //

The progeny of Kadru were a thousand powerful many-headed serpents, of immeasurable might, subject to Garud́a; the chief amongst whom were Śesha, Vásuki, Takshaka, Śankha, Śweta, Mahápadma, Kambala, Áswatara, Elápatra, Nága, Karkkota, Dhananjaya, and many other fierce and venomous serpents.