What download and upload speed each NBN connection type can realistically deliver, grounded in ACCC Measuring Broadband Australia and NBN Co data.
Your NBN connection type sets the maximum speed you can ever reach, regardless of the plan tier you pay for. NBN Co delivers connections over six physical technologies, and each has a different physical ceiling. FTTP (Fibre to the Premises) runs fibre all the way to your home and can carry every current speed tier, including NBN 1000. HFC (Hybrid Fibre-Coaxial) uses the pay-TV cable network and also supports high tiers in most areas. FTTN (Fibre to the Node) and FTTC (Fibre to the Curb) rely on the final stretch of copper, and copper loses speed over distance — a long FTTN line may physically be unable to sync at 100Mbps even on an NBN 100 plan. Fixed Wireless delivers over a tower-to-antenna radio link, and Satellite (Sky Muster) covers remote premises where latency and shared capacity limit real-world performance. This is why two households on the same NBN 50 plan can measure very different speeds: the plan number is what you buy, but the technology is what the line can actually give you. Before you complain about a slow plan, confirm which of these six types serves your address — you can check this on the NBN Co address checker.
The realistic download speed you can expect differs sharply by technology. The figures below reflect NBN Co technology capability and ACCC Measuring Broadband Australia busy-hour observations — verify the current published quarter at the ACCC before relying on any number.
Fibre runs to your home. Supports every tier up to NBN 1000. No copper bottleneck, so the plan tier is the practical limit.
Uses pay-TV coaxial cable for the final run. Supports high tiers in most areas; shared segments can dip during peak hours.
Fibre to a pit near your street, short copper to the home. Commonly reaches NBN 100; the short copper run limits few premises.
Fibre to a street cabinet, then copper to the home. Longer copper lines lose speed; some lines cannot sync at 100Mbps at all.
Radio link from an NBN tower to a roof antenna. Speeds vary with tower distance and congestion; performance drops when the cell is busy.
For remote premises with no fixed line. High latency from the satellite hop and shared capacity limit real-world evening speeds.
Copper-based connections lose speed as the copper run gets longer, which is why FTTN is the technology most likely to underdeliver. On FTTN, the fibre stops at a street node and the signal travels the last few hundred metres over the old copper phone line to your home. Every extra metre of copper, plus its age and condition, drops the maximum sync speed. A household 200 metres from the node may sync near the top of an NBN 100 plan, while a household 700 metres away on the identical plan may be physically capped well below 50Mbps — the modem simply cannot negotiate a faster line. FTTC shortens this copper run to a pit at the kerb, which is why it typically performs better than FTTN and reaches NBN 100 for most premises. If you are on FTTN and consistently miss your plan speed even on a wired connection at quiet times, the copper line length is the likely cause, and no plan upgrade will fix it — you would need a technology change. NBN Co publishes maximum attainable speed data your provider can check on your line; ask your RSP for your line's attainable rate before assuming the plan is the problem.
Confirm your connection type before drawing any conclusion about slow speed, because the fix differs entirely by technology.
Enter your address on the NBN Co website to see your listed connection technology (FTTP, FTTN, FTTC, HFC, Fixed Wireless or Satellite).
On FTTN and FTTC, request the maximum attainable line speed NBN Co records for your address — this reveals a copper-length cap.
Test on an Ethernet cable outside peak hours to separate a line-type ceiling from Wi-Fi or congestion issues.
Match the result to what your plan tier and technology can realistically deliver using the comparison above.