The nominate subspecies of the Asian house martin, D. d. dasypus, breeds in the southeast of Russia, the Kuril Islands, Japan and sometimes Korea. It migrates through eastern China to winter in the Malay Peninsula, Borneo, the Philippines, Java and Sumatra; a few birds remain around hot springs in Japan. D. d. cashmeriensis breeds in the Himalayas from Afghanistan east to Sikkim and northwards into Tibet and western and central China. It is found between altitude, although mainly in the range. This martin is a short-range migrant, mainly wintering at lower altitudes in the foothills of the Himalayas, but with some birds on the plains of North-eastern India and North-eastern and South-eastern Bangladesh, and smaller numbers further afield in Myanmar and northern Thailand. The third race, D. d. nigrimentalis, breeds in southeastern China and southern Siberia. Its wintering grounds are unknown, but birds in Taiwan just move to lower altitudes in winter. Non-breeding Asian house martin have been recorded as far west as the United Arab Emirates. The range of D. d. cashmeriensis overlaps with that of the Nepal house martin, although they breed at somewhat different altitudes. The height separation and the small differences in appearance seem sufficient to prevent interbreeding.