FAQ ( 001 )
Frequently asked questions
The short answers. For the full method — sources, matching, the delisting window, how accuracy is measured — see the methodology.
What is blipton?
blipton is a daily index of the on/off-market status and planning envelope (zone, floor-space ratio, height of building, minimum lot size) of all 4,905,892 residential addresses in New South Wales, Australia. It is delivered as a daily CSV and a REST API.
How often is the data updated?
Market status is refreshed every day. Planning attributes are refreshed weekly at the government source and re-joined nightly for new listings and quarterly statewide. The address register itself is refreshed quarterly, matching the G-NAF release cycle.
How many properties are for sale in NSW at any time?
Roughly 51,000 — about 1.1% of the 4,905,892 residential addresses blipton tracks. The exact live count is published on the blipton dashboard and API each day.
How accurate is the on/off-market status?
blipton reports recall (of the properties genuinely on the market, how many were caught) and precision (of the properties flagged, how many really are listed), measured only on the on-market class. A single "accuracy" percentage is deliberately not quoted: because only ~1.1% of addresses are on the market, a system that labelled every address off-market would score 98.9% accuracy while finding nothing.
Where does the address data come from?
The Geocoded National Address File (G-NAF), Australia’s authoritative address register, published by Geoscape Australia and licensed under the Open G-NAF End User Licence Agreement. blipton loads the complete NSW set and collapses alias records onto their principal address.
Where do the zoning and planning attributes come from?
From the NSW Planning Portal’s Environmental Planning Instrument spatial layers (land zoning, floor-space ratio, height of building, minimum lot size), published by the NSW Department of Planning, Housing and Infrastructure under CC BY 4.0. Each address is joined point-in-polygon at its authoritative G-NAF geocode; 99.6% of addresses carry a zone. The attributes are indicative and are not a section 10.7 planning certificate.
How are delistings detected?
A property is marked off-market only after it has been absent from the public listing surface for 3 consecutive daily runs. This confirmation window prevents listings that briefly drop out and return from flipping the data back and forth.
Does blipton include prices, photos or listing descriptions?
No. blipton publishes facts, not content: an address, a suburb, a postcode, an on/off-market status, dates, and the site’s planning envelope. No photographs, prices, descriptions, agent details or third-party listing identifiers are collected or resold.
Is there an API?
Yes — a token-authenticated REST API for per-address status lookups, suburb sweeps and fuzzy address matching, priced at A$0.02 per metered lookup (incl. GST). Every new account starts with $2 of free credit — 100 calls, no card required. Daily CSVs are available per suburb (A$99/month) or statewide (A$2,200/month). Full reference at /developers.
Which areas does blipton cover?
All of New South Wales today — metro and regional, 4,905,892 residential addresses. Victoria, Queensland and other states are planned before 2027 on the same schema.