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sensors Mode-S transponder

ABAB79

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N851EF · CIRRUS SR-20 · operated by LUFTHANSA AVIATION TRAINING USA INC

Hex
ABAB79
Octal
52725571
Decimal
11,250,553
Country
US
Tail
N851EF
Type
SR20
Transponder active on ground
Flights observed
303
Distinct callsigns
1
Country
US
Last broadcast
7d ago

Last known position

Most recent position reported by Mode-S ABAB79.

Country allocation

The ICAO 24-bit address ABAB79 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
VAR851 - 303 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 VAR851 GYR → GYR Jul 26, 20:35 UTCJul 26, 21:45 UTC1h 10m
2026-07-26 VAR851 GYR → GYR Jul 26, 18:20 UTCJul 26, 19:15 UTC55m
2026-07-26 VAR851 GYR → GYR Jul 26, 15:15 UTCJul 26, 15:55 UTC40m
2026-07-23 VAR851 - Jul 23, 05:05 UTCJul 23, 05:50 UTC45m
2026-07-23 VAR851 - Jul 23, 03:25 UTCJul 23, 04:20 UTC55m
2026-07-23 VAR851 GYR → GYR Jul 23, 00:15 UTCJul 23, 01:50 UTC1h 35m
2026-07-22 VAR851 GYR → GYR Jul 22, 20:25 UTCJul 22, 22:10 UTC1h 45m
2026-07-22 VAR851 GYR → GYR Jul 22, 16:40 UTCJul 22, 18:20 UTC1h 40m
2026-07-22 VAR851 GYR → GYR Jul 22, 13:50 UTCJul 22, 15:35 UTC1h 45m
2026-07-22 VAR851 GYR → GYR Jul 22, 00:55 UTCJul 22, 02:10 UTC1h 15m
2026-07-21 VAR851 GYR → GYR Jul 21, 21:10 UTCJul 21, 22:15 UTC1h 5m
2026-07-21 VAR851 GYR → GYR Jul 21, 18:00 UTCJul 21, 19:25 UTC1h 25m
2026-07-21 VAR851 GYR → GYR Jul 21, 15:00 UTCJul 21, 16:30 UTC1h 30m
2026-07-21 VAR851 - Jul 21, 02:15 UTCJul 21, 04:00 UTC1h 45m
2026-07-20 VAR851 - Jul 20, 23:15 UTCJul 21, 01:05 UTC1h 49m
2026-07-20 VAR851 GYR → GYR Jul 20, 18:35 UTCJul 20, 19:50 UTC1h 15m
2026-07-20 VAR851 GYR → GYR Jul 20, 14:40 UTCJul 20, 16:25 UTC1h 45m
2026-07-20 VAR851 - Jul 20, 00:35 UTCJul 20, 04:25 UTC3h 50m
2026-07-19 VAR851 GYR → GYR Jul 19, 20:45 UTCJul 19, 23:00 UTC2h 15m
2026-07-19 VAR851 GYR → GYR Jul 19, 17:55 UTCJul 19, 19:35 UTC1h 40m
2026-07-19 VAR851 - Jul 19, 03:25 UTCJul 19, 05:10 UTC1h 45m
2026-07-19 VAR851 GYR → BXK Jul 19, 00:10 UTCJul 19, 02:20 UTC2h 10m
2026-07-18 VAR851 - Jul 18, 21:55 UTCJul 18, 22:10 UTC15m
2026-07-18 VAR851 - Jul 18, 20:05 UTCJul 18, 21:10 UTC1h 5m
2026-07-18 VAR851 GYR → GYR Jul 18, 16:10 UTCJul 18, 17:55 UTC1h 45m
2026-07-17 VAR851 GYR → GYR Jul 17, 20:40 UTCJul 17, 22:45 UTC2h 5m
2026-07-16 VAR851 - Jul 16, 23:15 UTCJul 17, 00:50 UTC1h 35m
2026-07-16 VAR851 - Jul 16, 18:44 UTCJul 16, 21:10 UTC2h 25m
2026-07-16 VAR851 - Jul 16, 14:55 UTCJul 16, 15:49 UTC55m
2026-07-15 VAR851 GYR → GYR Jul 15, 21:20 UTCJul 15, 22:45 UTC1h 25m
2026-07-15 VAR851 - Jul 15, 19:05 UTCJul 15, 19:50 UTC45m
2026-07-15 VAR851 - Jul 15, 17:05 UTCJul 15, 18:20 UTC1h 15m
2026-07-15 VAR851 GYR → GYR Jul 15, 14:45 UTCJul 15, 15:55 UTC1h 10m
2026-07-15 VAR851 GYR → GYR Jul 15, 14:30 UTCJul 15, 14:40 UTC10m
2026-07-10 VAR851 GYR → GYR Jul 10, 19:45 UTCJul 10, 21:20 UTC1h 35m
2026-07-10 VAR851 GYR → GYR Jul 10, 01:20 UTCJul 10, 02:45 UTC1h 25m
2026-07-09 VAR851 GYR → GYR Jul 9, 18:40 UTCJul 9, 20:20 UTC1h 40m
2026-07-09 VAR851 GYR → GYR Jul 9, 15:40 UTCJul 9, 16:35 UTC55m
2026-07-08 VAR851 GYR → GYR Jul 8, 20:40 UTCJul 8, 22:35 UTC1h 55m
2026-07-08 VAR851 GYR → GYR Jul 8, 18:05 UTCJul 8, 19:15 UTC1h 10m
2026-07-08 VAR851 - Jul 8, 15:35 UTCJul 8, 16:50 UTC1h 15m
2026-07-08 VAR851 - Jul 8, 13:55 UTCJul 8, 14:35 UTC40m
2026-07-08 VAR851 - Jul 8, 13:25 UTCJul 8, 13:50 UTC25m
2026-07-08 VAR851 - Jul 8, 06:45 UTCJul 8, 06:55 UTC10m
2026-07-08 VAR851 - Jul 8, 05:50 UTCJul 8, 06:40 UTC50m
2026-07-08 VAR851 - Jul 8, 04:10 UTCJul 8, 04:55 UTC45m
2026-07-07 VAR851 GYR → GYR Jul 7, 22:55 UTCJul 8, 00:50 UTC1h 55m
2026-07-07 VAR851 GYR → GYR Jul 7, 19:00 UTCJul 7, 21:10 UTC2h 10m
2026-07-07 VAR851 GYR → GYR Jul 7, 16:35 UTCJul 7, 17:55 UTC1h 20m
2026-07-07 VAR851 GYR → GYR Jul 7, 14:05 UTCJul 7, 15:25 UTC1h 20m

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 N851EF page for operator, model, and routing details .

Mode-S ABAB79 frequently asked

What is Mode-S code ABAB79?
ABAB79 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N851EF.
Where is Mode-S ABAB79 registered?
Mode-S code ABAB79 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 ABAB79 broadcasting right now?
Mode-S ABAB79 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABAB79, octal 52725571, decimal 11,250,553.
What flights does ABAB79 operate?
Mode-S ABAB79 has broadcast 1 distinct callsign, including VAR851.