Example embodiments of the systems and methods of IPv6 mapping disclosed herein involve computing an IPv6 source and/or destination address based on the type of service being used by the user, which is derived from the digits input to the device by the user or system, and the destination phone number input by the user. The mapping is done in second half (for example, 64 bits) of the IPv6 address (the interface ID). The first half of the IPv6 address is a defined subnet (known as a “prefix” in IPv6 terms) for phone number routing. The subnet comprises a global routing prefix and a subnet identification. The interface ID is split into three sections: an identifier, a country code, and an end point number.