A reliable source told iTWire that residents of the New South Wales suburb of Mona Vale were among those whose addresses did not evoke any response when fed into the NBN Co address checker on Sunday.
According to this source, for several months, and up to Saturday, the address checker said that residents of Mona Vale would be getting FttC between April and June next year.
Today, however, no technology was listed and no date was given either.
On the Whirlpool broadband forum, one user, writing under the psedudonym Phg, posted, "Bets are on as whether the dates for FttC are all going to be pushed back at least 3-6 months for most on the NBN Co's FttC schedule."
When asked why, Phg responded: "Why? Because NBN Co has today removed FttC rollout dates from it's NBN Co address checker."
Another user commented: "This doesn't surprise me, I was never expecting FttC to go live much before at least the 2nd quarter of next year as they only fairly recently awarded the contract for integrating it into their back-end systems.
"At least they're putting it in the ground I guess. Interestingly, I now get no date, just that construction has commenced. As of yesterday it said 'From May 2018'."
iTWire's source said the beachside suburb of Narrabeen in NSW also appeared to be affected.
The source said that he had a premises in this suburb but the address had also disappeared from a listing of getting FttC between April and June 2018 to merely saying: 'The rollout of the NBN broadband access network is planned in this area'."
"All details of the rollout itself have been removed," he said.
Whirlpool user Phg commented: "You'd think that NBN Co would at least bother to communicate to Australia via its website and Twitter that dates were about to be removed or updated for the up to one million FttC premises earmarked for FttC yesterday.
"Or if there was some stuff up in an overnight update, that they'd at least apologise and get some kudos for that."
But another Whirlpool user struck a positive note. "I just want to point out that while it's frustrating, this has happened before, only a few months ago in fact," the user, posting as someckguy, wrote.
"The result of that was a lot of dates actually being moved forwards. Obviously because we're at the end of 2017 that's not going to happen, but don't automatically assume your technology is going to change or it's going to get delayed by a huge amount.
"This has happened before and things were fine. Let's hope this is the case again."
iTWire has contacted NBN Co for comment.