NBN Co has culled ready for service dates for 506,850 premises in brownfields suburbs across Australia, casting doubt on whether those households will ever receive a fibre-to-the-home connection.

The network builder last night made sweeping changes to the data in its rollout map and to its website, hours after Telstra revealed large-scale changes to NBN ready for service dates.

Ready for Service dates denote when customers in a rollout area can take up a retail internet service.

Among the changes:

NBN Co removed all remaining documents that detail rollout progress, such as the monthly ready for service spreadsheets, from its website. The information will now only be available via a sales portal that is not accessible to the public, casting doubt on Coalition pledges to increase transparency.

The NBN rollout map was reformatted to include a new categorisation called "build commenced" areas, denoting locations where NBN Co "has issued contract instructions to construction partners so they can commence work in this area".

But the changes that attracted the most attention are to ready for service dates. These were made in documentation that is infrequently published by Telstra Wholesale.

The changes appear to show the areas that will receive the final 300,000 fibre connections guaranteed in the interim statement of expectations that was given to NBN Co last month.

Kenneth Tsang, founder of myNBN.info, calculated that 307,800 premises in the new dataset have ready for service dates, effectively vetting the 300,000 figure provided by Communications Minister Malcolm Turnbull last month. A full list of the final brownfields fibre recipients can be found here.

iTnews' analysis of the new dataset shows an additional 506,850 premises in 256 fibre serving area modules (FSAMs) where a future with fibre-to-the-home is far less guaranteed.

These are rollout areas and premises that until now had been given a date on when to expect fibre-to-the-home connections that are ready to carry retail internet services. As of late last night, the ready for service date has been switched to "TBA".

NBN Co and the Government won't formally confirm which premises will miss out on fibre-to-the-home until a 60-day strategic review is completed late next month.

iTnews is seeking additional comment from NBN Co.

Are you in the half-million?

NSW - Sydney metropolitan:

FSAMs Affected Suburbs Construction

Commenced Premises 2BLK-07,

09, 10 Blacktown, Eastern Creek,

Prospect, Arndell Park,

Doonside, Woodcroft Feb-April 2013 8700 2CBT-01 Campbelltown, Bradbury May 2013 3000 2HOM-04 Strathfield Dec 2012 2300 2LID-07, 08 Auburn Dec 2012, Jan 2013 5400 2LIV-02, 03, 04 Lurnea, Liverpool Feb 2013-Apr 2013 9700 2PTH-07, 08 Werrington Downs, Cambridge

Park, Kingswood Mar-Apr 2013 4300 2RCH-07 Richmond Lowlands, Clarendon Mar 2013 500

NSW - Regional:

FSAMs Affected Locations Construction

Commenced Premises 2COR-04, 05,

06, 07, 08 Woonona, Russell Vale,

Corrimal, Bellambi, Tarrawanna,

Fairy Meadow, Fernhill,

Towradgi, Balgownie Dec 2012-Feb 2013 13,200 2DAP-01, 05,

06 Kembla Grange, Wongawilli,

Horsley, Marshall Mount,

Penrose, Dapto Nov-Dec 2012 4800 2DBB-03 Dubbo March 2013 2400 2GOS-07, 08 Point Clare, Tascott,

Koolewong, Somersby, Kariong Oct-Nov 2012 5300 2GRN-02 South Grafton, Waterview

Heights, Grafton Apr 2013 3000 2LJT-05, 06,

08, 09 Bateau Bay, The Entrance,

Long Jetty, Toowoon Bay,

Blue Bay Dec 2012-Mar 2013 11,600 2MAI-03, 07, 11 Pitnacree, Tenambit, East Maitland,

Raworth, Metford, Morpeth Dec 2012-Feb 2013 7500 2MDG-01, 02, 03 Mudgee, Putta Bucca,

Bombira, Burrundulla Sep-Nov 2012 6100 2MYF-01 Mayfield Mar 2013 2800 2TEE-01, 03, 05 Taree, Cundletown Sep-Dec 2012 6800 2TRK-01 The Rock May 2013 400 2WAG--01, 02,

03, 04 North Wagga Wagga, Wagga Wagga,

Moorong, Boorooma, Cartwrights Hill,

Estella, Bomen, Turvey Park,

Charles Sturt University Mar-May 2013 7300 2WLG--02,

03, 04, 05, 06 Wollongong, West Wollongong,

Mangerton, Mount Keira, Keiraville,

Gwynneville, Mount Saint

Thomas, Coniston Sep 2012-Jan 2013 9900

Victoria:

FSAMs Affected Locations Construction

Commenced Premises 3BRA-07 Golden Point, Mount Pleasant,

Bakery Hill Apr 2013 2400 3BRU-07, 08 Brunswick, Brunswick West Dec 2012 4500 3CBN-04, 05 Cranbourne May 2013 5500 3CTN-03, 04, 06 Carlton, Melbourne, Parkville Sep 2012-Feb 2013 3800 3FSR-01, 04, 05 Seddon, West Melbourne,

Footscray, Yarraville Dec 2012-Mar 2013 8000 3KAL-02, 05 Frankston, Langwarrin Nov 2012-Mar 2013 5100 3KEY-01, 03, 04 Keysborough, Noble Park Jan-Apr 2013 7400 3SMR-08 South Morang May 2013 2400 3TMN-06 Melbourne Airport Feb 2013 2500 3WER-01 Werribee Apr 2013 2700

Read on for tables for all other states and territories.