Man pages matching name number::phone::nanp::do in section 3pm:

Number::Phone::NANP::DO.3pm.en	debian 10 / libnumber-phone-perl
Number::Phone::NANP::DO.3pm.en	debian 11 / libnumber-phone-perl
Number::Phone::NANP::DO.3pm.en	debian 12 / libnumber-phone-perl