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Ud 8.1 says Nibbana is not a "world" (loka) or "other world" (paraloka). Any "world" includes suffering (SN 12.44). Nibbana is the cessation of the world (lokanirodhañca; AN 4.45).
Tasmā have lokavidū sumedho, Lokantagūlokantagū vusitabrahmacariyo; Lokassa antaṃ samitāvi ñatvā, Nāsīsatī lokamimaṃ parañcā
So, truly, the wise one, an expert with regard to the world, a knower of the end of the world, having fulfilled the holy life, calmed, knowing the worlds’ end, doesn’t long for this world or for any other world.