Apparatus

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sensors Mode-S transponder

A1B829

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N21LF · operated by LUNKEN FLIGHT TRAINING CENTER LLC

Hex
A1B829
Octal
50334051
Decimal
10,598,441
Country
US
Tail
N21LF
Type
C172
No current signal · last broadcast 13h ago
Flights observed
117
Distinct callsigns
1
Country
US
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S A1B829.

Country allocation

The ICAO 24-bit address A1B829 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
N21LF - 117 2026-06-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-12 N21LF LUK → LUK Jun 12, 19:30 UTCJun 12, 20:45 UTC1h 15m
2026-06-11 N21LF - Jun 11, 20:20 UTCJun 11, 20:40 UTC20m
2026-06-11 N21LF - Jun 11, 19:55 UTCJun 11, 20:15 UTC20m
2026-06-11 N21LF LUK → LUK Jun 11, 17:45 UTCJun 11, 18:20 UTC35m
2026-06-10 N21LF - Jun 10, 22:00 UTCJun 10, 22:45 UTC45m
2026-06-10 N21LF LUK → LUK Jun 10, 19:35 UTCJun 10, 20:45 UTC1h 10m
2026-06-10 N21LF LUK → LUK Jun 10, 17:40 UTCJun 10, 18:20 UTC40m
2026-06-07 N21LF - Jun 7, 19:50 UTCJun 7, 20:55 UTC1h 5m
2026-06-06 N21LF LUK → LUK Jun 6, 21:50 UTCJun 6, 22:44 UTC55m
2026-06-06 N21LF LUK → LUK Jun 6, 15:50 UTCJun 6, 17:00 UTC1h 10m
2026-06-06 N21LF - Jun 6, 13:30 UTCJun 6, 14:30 UTC1h 0m
2026-06-06 N21LF - Jun 6, 01:45 UTCJun 6, 02:40 UTC55m
2026-06-05 N21LF LUK → LUK Jun 5, 19:55 UTCJun 5, 21:00 UTC1h 5m
2026-06-05 N21LF LUK → LUK Jun 5, 17:45 UTCJun 5, 18:25 UTC40m
2026-06-05 N21LF - Jun 5, 15:45 UTCJun 5, 16:50 UTC1h 5m
2026-06-05 N21LF LUK → LUK Jun 5, 13:40 UTCJun 5, 14:40 UTC1h 0m
2026-06-04 N21LF LUK → LUK Jun 4, 22:05 UTCJun 4, 22:45 UTC40m
2026-06-04 N21LF LUK → LUK Jun 4, 20:10 UTCJun 4, 20:50 UTC40m
2026-06-04 N21LF LUK → LUK Jun 4, 17:50 UTCJun 4, 18:55 UTC1h 5m
2026-06-04 N21LF LUK → LUK Jun 4, 16:00 UTCJun 4, 16:45 UTC45m
2026-06-04 N21LF LUK → LUK Jun 4, 13:35 UTCJun 4, 14:35 UTC1h 0m
2026-06-03 N21LF LUK → LUK Jun 3, 21:45 UTCJun 3, 22:40 UTC55m
2026-05-19 N21LF LUK → LUK May 19, 19:55 UTCMay 19, 20:50 UTC55m
2026-05-19 N21LF LUK → LUK May 19, 17:45 UTCMay 19, 18:40 UTC55m
2026-05-19 N21LF LUK → LUK May 19, 15:35 UTCMay 19, 16:25 UTC50m
2026-05-19 N21LF LUK → LUK May 19, 13:35 UTCMay 19, 14:45 UTC1h 10m
2026-05-18 N21LF - May 18, 19:30 UTCMay 18, 20:20 UTC50m
2026-05-18 N21LF LUK → LUK May 18, 17:35 UTCMay 18, 18:10 UTC35m
2026-05-18 N21LF LUK → LUK May 18, 15:40 UTCMay 18, 16:25 UTC45m
2026-05-18 N21LF LUK → LUK May 18, 13:45 UTCMay 18, 15:00 UTC1h 15m
2026-05-17 N21LF LUK → LUK May 17, 19:55 UTCMay 17, 20:35 UTC40m
2026-05-17 N21LF - May 17, 17:50 UTCMay 17, 18:40 UTC50m
2026-05-17 N21LF LUK → LUK May 17, 15:35 UTCMay 17, 16:35 UTC1h 0m
2026-05-15 N21LF LUK → LUK May 15, 21:35 UTCMay 15, 22:30 UTC55m
2026-05-15 N21LF - May 15, 19:40 UTCMay 15, 19:55 UTC15m
2026-05-15 N21LF LUK → LUK May 15, 15:40 UTCMay 15, 16:25 UTC45m
2026-05-15 N21LF LUK → LUK May 15, 13:30 UTCMay 15, 14:40 UTC1h 10m
2026-05-14 N21LF - May 14, 19:50 UTCMay 14, 20:45 UTC55m
2026-05-14 N21LF - May 14, 17:50 UTCMay 14, 18:45 UTC55m
2026-05-14 N21LF LUK → LUK May 14, 13:35 UTCMay 14, 14:45 UTC1h 10m
2026-05-13 N21LF OXD → LUK May 13, 16:15 UTCMay 13, 16:35 UTC20m
2026-05-13 N21LF - May 13, 12:25 UTCMay 13, 12:55 UTC30m
2026-05-12 N21LF LUK → LUK May 12, 18:05 UTCMay 12, 19:05 UTC1h 0m
2026-05-12 N21LF - May 12, 15:30 UTCMay 12, 16:20 UTC50m
2026-05-12 N21LF LUK → LUK May 12, 12:05 UTCMay 12, 13:55 UTC1h 50m
2026-05-11 N21LF - May 11, 16:10 UTCMay 11, 16:30 UTC20m
2026-05-10 N21LF - May 10, 17:59 UTCMay 10, 19:24 UTC1h 25m
2026-05-10 N21LF - May 10, 15:49 UTCMay 10, 16:44 UTC55m
2026-05-09 N21LF LUK → LUK May 9, 19:35 UTCMay 9, 20:30 UTC55m
2026-05-08 N21LF LUK → LUK May 8, 21:25 UTCMay 8, 23:10 UTC1h 45m

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 N21LF page for operator, model, and routing details .

Mode-S A1B829 frequently asked

What is Mode-S code A1B829?
A1B829 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N21LF.
Where is Mode-S A1B829 registered?
Mode-S code A1B829 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 A1B829 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1B829, octal 50334051, decimal 10,598,441.
What flights does A1B829 operate?
Mode-S A1B829 has broadcast 1 distinct callsign, including N21LF.