Shiva Purana
चत्वारिंशत्साष्टशतं कैलासं भूसहस्रकम् ॥ चत्वारिंशच्च द्विशतं वायवीयमतः परम् ॥ ६३ ॥
There are forty-eight hundred Kailāsas and one thousand earths. Forty-two and beyond the Vayaviya.
english translation
catvAriMzatsASTazataM kailAsaM bhUsahasrakam ॥ catvAriMzacca dvizataM vAyavIyamataH param ॥ 63 ॥
hk transliteration by Sanscript