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sensors Mode-S transponder

A1B793

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N21EF · CIRRUS SR-20 · operated by ELITE FLIGHT EXPERIENCE LLC

Hex
A1B793
Octal
50333623
Decimal
10,598,291
Country
US
Tail
N21EF
Type
SR20
No current signal · last broadcast 2d ago
Flights observed
99
Distinct callsigns
1
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A1B793.

Country allocation

The ICAO 24-bit address A1B793 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
N21EF - 99 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 N21EF - Jul 15, 18:55 UTCJul 15, 19:55 UTC1h 0m
2026-07-15 N21EF - Jul 15, 13:50 UTCJul 15, 15:05 UTC1h 15m
2026-07-14 N21EF - Jul 14, 18:15 UTCJul 14, 19:20 UTC1h 5m
2026-07-14 N21EF - Jul 14, 13:15 UTCJul 14, 13:55 UTC40m
2026-07-14 N21EF - Jul 14, 12:10 UTCJul 14, 12:30 UTC20m
2026-07-14 N21EF - Jul 14, 11:15 UTCJul 14, 12:05 UTC50m
2026-07-13 N21EF - Jul 13, 22:15 UTCJul 13, 23:00 UTC45m
2026-07-13 N21EF - Jul 13, 18:10 UTCJul 13, 19:20 UTC1h 10m
2026-07-13 N21EF BLM → BLM Jul 13, 15:45 UTCJul 13, 17:10 UTC1h 25m
2026-07-13 N21EF BLM → BLM Jul 13, 13:35 UTCJul 13, 14:45 UTC1h 10m
2026-07-12 N21EF - Jul 12, 20:30 UTCJul 12, 21:00 UTC30m
2026-07-12 N21EF - Jul 12, 18:15 UTCJul 12, 19:35 UTC1h 20m
2026-07-09 N21EF - Jul 9, 19:05 UTCJul 9, 19:40 UTC35m
2026-07-09 N21EF - Jul 9, 18:10 UTCJul 9, 18:25 UTC15m
2026-07-09 N21EF - Jul 9, 11:40 UTCJul 9, 12:45 UTC1h 5m
2026-07-05 N21EF - Jul 5, 22:30 UTCJul 5, 23:00 UTC30m
2026-07-05 N21EF - Jul 5, 13:50 UTCJul 5, 14:25 UTC35m
2026-06-29 N21EF - Jun 29, 18:14 UTCJun 29, 18:25 UTC10m
2026-06-29 N21EF - Jun 29, 14:25 UTCJun 29, 14:39 UTC15m
2026-06-27 N21EF - Jun 27, 02:04 UTCJun 27, 02:29 UTC25m
2026-06-27 N21EF - Jun 27, 00:00 UTCJun 27, 00:25 UTC25m
2026-06-26 N21EF - Jun 26, 20:44 UTCJun 26, 21:39 UTC55m
2026-06-26 N21EF - Jun 26, 18:39 UTCJun 26, 18:54 UTC15m
2026-06-26 N21EF - Jun 26, 17:29 UTCJun 26, 17:40 UTC10m
2026-06-26 N21EF - Jun 26, 13:55 UTCJun 26, 14:29 UTC35m
2026-06-26 N21EF - Jun 26, 01:10 UTCJun 26, 02:00 UTC50m
2026-06-25 N21EF - Jun 25, 21:59 UTCJun 25, 22:45 UTC45m
2026-06-25 N21EF - Jun 25, 19:49 UTCJun 25, 20:45 UTC55m
2026-06-25 N21EF - Jun 25, 13:55 UTCJun 25, 14:39 UTC45m
2026-06-25 N21EF - Jun 25, 12:19 UTCJun 25, 13:05 UTC45m
2026-06-24 N21EF - Jun 24, 15:24 UTCJun 24, 16:24 UTC1h 0m
2026-06-21 N21EF - Jun 21, 19:50 UTCJun 21, 21:24 UTC1h 35m
2026-06-20 N21EF - Jun 20, 23:50 UTCJun 21, 00:29 UTC40m
2026-06-20 N21EF - Jun 20, 14:54 UTCJun 20, 16:24 UTC1h 30m
2026-06-19 N21EF - Jun 19, 23:54 UTCJun 20, 00:39 UTC45m
2026-06-19 N21EF - Jun 19, 21:19 UTCJun 19, 22:19 UTC1h 0m
2026-06-19 N21EF - Jun 19, 18:05 UTCJun 19, 19:09 UTC1h 5m
2026-06-17 N21EF - Jun 17, 16:30 UTCJun 17, 18:00 UTC1h 30m
2026-06-17 N21EF - Jun 17, 14:50 UTCJun 17, 15:35 UTC45m
2026-06-17 N21EF BLM → LNS Jun 17, 13:30 UTCJun 17, 14:20 UTC50m
2026-06-16 N21EF - Jun 16, 20:35 UTCJun 16, 22:20 UTC1h 45m
2026-06-16 N21EF BLM → BLM Jun 16, 16:39 UTCJun 16, 17:15 UTC35m
2026-06-16 N21EF - Jun 16, 13:15 UTCJun 16, 14:09 UTC55m
2026-06-16 N21EF - Jun 16, 11:35 UTCJun 16, 12:35 UTC1h 0m
2026-06-14 N21EF - Jun 14, 15:50 UTCJun 14, 17:40 UTC1h 50m
2026-06-13 N21EF - Jun 13, 14:25 UTCJun 13, 15:00 UTC35m
2026-06-13 N21EF LNS → ABE Jun 13, 13:40 UTCJun 13, 14:15 UTC35m
2026-06-13 N21EF - Jun 13, 12:25 UTCJun 13, 13:25 UTC1h 0m
2026-06-12 N21EF BLM → BLM Jun 12, 13:10 UTCJun 12, 14:30 UTC1h 20m
2026-06-09 N21EF - Jun 9, 13:30 UTCJun 9, 14:00 UTC30m

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 N21EF page for operator, model, and routing details .

Mode-S A1B793 frequently asked

What is Mode-S code A1B793?
A1B793 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N21EF.
Where is Mode-S A1B793 registered?
Mode-S code A1B793 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 A1B793 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1B793, octal 50333623, decimal 10,598,291.
What flights does A1B793 operate?
Mode-S A1B793 has broadcast 1 distinct callsign, including N21EF.