No area starts with 857 in Ireland. It could either be an 085 number, which is a mobile phone or 057. See the related question below.
The country code and area code of Tottori, Japan is 81, (0)857.
Belmont, MA, is in area codes 617 and 857.
The country code and area code of Letterkenny, Ireland is 353, (0)74.
The country code and area code of Carlow, Ireland is 353, (0)59.
The country code and area code of Ennis, Ireland is 353, (0)65.
The country code and area code of Clonmel, Ireland is 353, (0)52.
The country code and area code of Portlaoise, Ireland is 353, (0)57.
The country code and area code of Longford, Ireland is 353, (0)43.
The country code and area code of Castlebar, Ireland is 353, (0)94.
The country code and area code of Dundalk, Ireland is 353, (0)42.
The country code and area code of Drogheda, Ireland is 353, (0)41.
The country code and area code of Naas, Ireland is 353, (0)45.