Cafodd y codau post ar gyfer y rhan gyntaf eu cofnodi drwy adolygiad ac ymgynghoriad cyhoeddus a gynhaliwyd y llynedd. Ar wefan Llywodraeth Cymru, sef www.cymru.gov.uk/bandeang, ceir manylion y rhestr o godau post y bwriadwn eu cynnwys o fewn y rhan gyntaf. Mae cyfanswm o 45,000 yn dod o fewn y rhan hon. Mae pob ardal cod post yn cynnwys o leiaf un safle sydd y tu allan i gwmpas prosiect Cyflymu Cymru ac ôl troed y darparwyr masnachol.
The postcode areas for phase one were identified through a review and public consultation carried out last year.  Details of the list of postcodes which we intend to cover under phase one are available on the Welsh Government website www.wales.gov.uk/broadband. In total around 45,000 fall within this phase.  Each postcode area listed includes at least one premises outside of the scope of the Superfast Cymru project and the footprint of the commercial providers.