Āsandīvat is the capital of Pārikṣhit Janamejaya, though this Janamejaya is not the descendant of the Pāṇḍava, and the grandson of Abhimanyu.He is the ancient Pārikṣhit Janamejaya mentioned in Aitareya and Śatapatha Brāhmaṇa.

According to Aitareya Brāhmaṇa, he kept his horse of Aśvamedha bound, in this very place. It has been said in Aitareya Brāhmaṇa– in this place called Āsandīvat, he bound a white horse, with a starry mark upon its head, giving it paddy and corns as food, to be sacrificed to the gods–
āsandīvati dhānyādaṃ rukmiṇaṃ haritasrajam
aśvaṃ vavandha sāraṅgaṃ devebhyo janamejayaḥ

In Aṣṭādhyāyī, Pāṇini has mentioned the term ̍āsandivat̍ as a place-name, as a term coined irregularly.

Āsandī comes from āsana and from that comes āsandīvat– for instance, Jinendra-vuddhi, the author of Kāśikā has written– ̍āsandīvat ahisthalam̍. Nāgasāhvaya is another name of Hastināpura. This nāga̍ also means ̍ahi̍ (snake)– so several scholars consider that the capital of Janamejaya was Hastināpura. This was in the conception of Jinendra-vuddhi, so he has referred to this Ahisthla or Hastināpura as the capial of Janamejaya, as mentioned in Śatapatha and Aitareya Brāhmaṇa.