Apparatus

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sensors Mode-S transponder

A51D5F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N429DF · NORTH AMERICAN OV-10 Bronco · operated by USDA FOREST SERVICE FEPP, CALIFORNIA DEPT OF FORESTRY AND FIRE PROTECTION

Hex
A51D5F
Octal
51216537
Decimal
10,820,959
Country
US
Tail
N429DF
Type
V10
No current signal · last broadcast 15h ago
Flights observed
72
Distinct callsigns
1
Country
US
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S A51D5F.

Country allocation

The ICAO 24-bit address A51D5F falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 1 distinct

Callsign Airline Flights Last seen
N429DF - 72 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-19 N429DF - Jun 19, 16:29 UTCJun 19, 16:39 UTC10m
2026-06-19 N429DF - Jun 19, 15:24 UTCJun 19, 15:54 UTC30m
2026-06-18 N429DF - Jun 18, 22:30 UTCJun 18, 22:55 UTC25m
2026-06-18 N429DF HMT → HMT Jun 18, 20:40 UTCJun 18, 21:50 UTC1h 10m
2026-06-18 N429DF HMT → HMT Jun 18, 15:05 UTCJun 18, 16:35 UTC1h 30m
2026-06-16 N429DF HMT → HMT Jun 16, 14:50 UTCJun 16, 15:45 UTC55m
2026-06-15 N429DF HMT → HMT Jun 15, 20:45 UTCJun 15, 20:59 UTC15m
2026-06-14 N429DF - Jun 14, 00:05 UTCJun 14, 00:25 UTC20m
2026-06-13 N429DF - Jun 13, 20:35 UTCJun 13, 21:50 UTC1h 15m
2026-06-13 N429DF HMT → HMT Jun 13, 01:50 UTCJun 13, 02:25 UTC35m
2026-06-12 N429DF - Jun 12, 17:05 UTCJun 12, 17:55 UTC50m
2026-06-11 N429DF HMT → HMT Jun 11, 23:20 UTCJun 12, 00:15 UTC55m
2026-06-09 N429DF HMT → HMT Jun 9, 19:15 UTCJun 9, 20:00 UTC45m
2026-06-08 N429DF - Jun 8, 20:25 UTCJun 8, 21:45 UTC1h 20m
2026-06-08 N429DF HMT → HMT Jun 8, 18:15 UTCJun 8, 19:10 UTC55m
2026-06-07 N429DF HMT → HMT Jun 7, 20:40 UTCJun 7, 21:45 UTC1h 5m
2026-06-06 N429DF HMT → HMT Jun 6, 17:24 UTCJun 6, 18:09 UTC45m
2026-06-05 N429DF HMT → HMT Jun 5, 21:15 UTCJun 5, 21:25 UTC10m
2026-06-05 N429DF HMT → HMT Jun 5, 19:20 UTCJun 5, 20:10 UTC50m
2026-06-05 N429DF HMT → HMT Jun 5, 17:30 UTCJun 5, 17:50 UTC20m
2026-06-04 N429DF HMT → HMT Jun 4, 22:55 UTCJun 4, 23:50 UTC55m
2026-06-04 N429DF HMT → HMT Jun 4, 20:30 UTCJun 4, 21:15 UTC45m
2026-06-02 N429DF HMT → HMT Jun 2, 22:05 UTCJun 3, 01:50 UTC3h 45m
2026-06-01 N429DF - Jun 1, 23:30 UTCJun 2, 00:10 UTC40m
2026-06-01 N429DF HMT → HMT Jun 1, 22:45 UTCJun 1, 23:10 UTC25m
2026-06-01 N429DF HMT → HMT Jun 1, 21:50 UTCJun 1, 22:40 UTC50m
2026-05-31 N429DF HMT → HMT May 31, 23:35 UTCJun 1, 00:40 UTC1h 5m
2026-05-28 N429DF - May 28, 23:50 UTCMay 29, 00:00 UTC10m
2026-05-28 N429DF HMT → HMT May 28, 21:40 UTCMay 28, 22:15 UTC35m
2026-05-26 N429DF HMT → HMT May 26, 19:15 UTCMay 26, 19:45 UTC30m
2026-05-25 N429DF HMT → HMT May 25, 17:45 UTCMay 25, 18:10 UTC25m
2026-05-21 N429DF HMT → HMT May 21, 20:10 UTCMay 21, 20:20 UTC10m
2026-05-21 N429DF - May 21, 18:10 UTCMay 21, 18:45 UTC35m
2026-05-20 N429DF - May 20, 22:05 UTCMay 20, 22:15 UTC10m
2026-05-20 N429DF - May 20, 21:10 UTCMay 20, 21:20 UTC10m
2026-05-19 N429DF - May 19, 19:40 UTCMay 19, 22:40 UTC3h 0m
2026-05-19 N429DF HMT → HMT May 19, 14:40 UTCMay 19, 18:50 UTC4h 10m
2026-05-18 N429DF - May 18, 22:30 UTCMay 19, 01:10 UTC2h 40m
2026-05-18 N429DF - May 18, 17:40 UTCMay 18, 21:45 UTC4h 4m
2026-05-14 N429DF - May 14, 20:50 UTCMay 14, 21:45 UTC55m
2026-05-13 N429DF HMT → HMT May 13, 00:10 UTCMay 13, 00:15 UTC5m
2026-05-11 N429DF HMT → HMT May 11, 20:30 UTCMay 11, 20:50 UTC20m
2026-05-11 N429DF HMT → HMT May 11, 19:00 UTCMay 11, 20:10 UTC1h 10m
2026-05-10 N429DF HMT → HMT May 10, 18:49 UTCMay 10, 19:09 UTC20m
2026-05-10 N429DF HMT → HMT May 10, 00:24 UTCMay 10, 00:45 UTC20m
2026-05-09 N429DF HMT → HMT May 9, 18:10 UTCMay 9, 18:45 UTC35m
2026-05-07 N429DF HMT → HMT May 7, 22:15 UTCMay 7, 23:29 UTC1h 15m
2026-05-03 N429DF - May 3, 01:35 UTCMay 3, 02:00 UTC25m
2026-05-02 N429DF - May 2, 21:55 UTCMay 2, 23:45 UTC1h 50m
2026-05-02 N429DF HMT → HMT May 2, 21:10 UTCMay 2, 21:30 UTC20m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N429DF page for operator, model, and routing details .

Mode-S A51D5F frequently asked

What is Mode-S code A51D5F?
A51D5F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N429DF.
Where is Mode-S A51D5F registered?
Mode-S code A51D5F is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A51D5F broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A51D5F, octal 51216537, decimal 10,820,959.
What flights does A51D5F operate?
Mode-S A51D5F has broadcast 1 distinct callsign, including N429DF.