+421-601-(100000...199999): Internet provider access point numbering scheme Xem thêm về +421-601-(100000...199999)
+421-601-(200000...299999): Internet provider access point numbering scheme Xem thêm về +421-601-(200000...299999)
+421-601-(300000...399999): Internet provider access point numbering scheme Xem thêm về +421-601-(300000...399999)
+421-601-(400000...499999): Internet provider access point numbering scheme Xem thêm về +421-601-(400000...499999)
+421-601-(500000...599999): Internet provider access point numbering scheme Xem thêm về +421-601-(500000...599999)
