Heard, not fetched
Aircraft broadcast their position on 1090 MHz. A receiver here decodes those transmissions directly — nothing on this page comes from a commercial tracking API.
OPXADS-B
Aircraft overhead, from my own receiver
Every aircraft in range of an antenna in Derbyshire, decoded here rather than fetched from anyone's API. The same receiver that feeds Flightradar24 — this is what it hears, one hop earlier.
Receiver offline1090 MHzLocal decode
The receiver isn’t answering at the moment — receiver returned 404. It is a small computer in a house, so this happens. The figures below are what it recorded before it went quiet.
In range right now
0
Aircraft heard
0
Airborne
the rest are on the ground
—
Furthest now
—
Highest now
Nothing in range at the moment. A quiet sky at night is normal — the antenna only hears what is line-of-sight, so traffic comes and goes with the hour.
What it has heard
Every aircraft the antenna has picked up since it started listening. Range is line-of-sight at 1090 MHz, so the furthest contacts are the high ones.
0
Aircraft today
0 position reports
585
Aircraft all time
154 mi
Furthest ever
DHK314
45k ft
Highest ever
Aircraft per day
29
30
31
1
2
3
4
5
6
7
8
9
10
11
How this works
Line of sight
1090 MHz does not bend round hills. Range depends on altitude and terrain, which is why an airliner at 38,000 feet is heard far further than a light aircraft in the circuit.
Working out what it is
ADS-B carries no aircraft type. Helicopters come from the emitter category, state aircraft from their ICAO address block, and air ambulance and police from the UK conspicuity squawks and callsign prefixes. Anything that reports none of those is left unlabelled rather than guessed at.
Ranges are approximate
Distances are measured from the centre of grid square IO93GE — a box about five kilometres across — rather than from the antenna itself. That keeps every figure honest to within a mile or two without putting a receiver's exact position on a public page.
The same feed drives microradar, a desk scope that draws this as a radar sweep.