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sensors Mode-S transponder

ABAB10

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N851AA · operated by AB PROP PLANE I LLC

Hex
ABAB10
Octal
52725420
Decimal
11,250,448
Country
US
Tail
N851AA
Type
P28A
No current signal · last broadcast 4h ago
Flights observed
177
Distinct callsigns
3
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S ABAB10.

Country allocation

The ICAO 24-bit address ABAB10 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 3 distinct

Callsign Airline Flights Last seen
N851AA - 175 2026-07-14
FDX34 - 1 2026-07-06
FDX32 FedEx Express 1 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 N851AA - Jul 14, 14:50 UTCJul 14, 15:45 UTC55m
2026-07-13 N851AA - Jul 13, 22:45 UTCJul 13, 23:35 UTC50m
2026-07-13 N851AA - Jul 13, 20:35 UTCJul 13, 21:25 UTC50m
2026-07-13 N851AA - Jul 13, 18:50 UTCJul 13, 19:35 UTC45m
2026-07-12 N851AA - Jul 12, 17:30 UTCJul 12, 18:05 UTC35m
2026-07-12 N851AA - Jul 12, 12:15 UTCJul 12, 13:35 UTC1h 20m
2026-07-11 N851AA - Jul 11, 12:35 UTCJul 11, 13:30 UTC55m
2026-07-10 N851AA - Jul 10, 18:25 UTCJul 10, 20:30 UTC2h 5m
2026-07-09 N851AA - Jul 9, 21:55 UTCJul 9, 22:25 UTC30m
2026-07-09 N851AA - Jul 9, 17:20 UTCJul 9, 18:35 UTC1h 15m
2026-07-09 N851AA - Jul 9, 14:55 UTCJul 9, 15:20 UTC25m
2026-07-08 N851AA - Jul 8, 16:35 UTCJul 8, 17:10 UTC35m
2026-07-06 FDX34 - Jul 6, 13:40 UTCJul 6, 13:50 UTC10m
2026-07-03 N851AA - Jul 3, 11:50 UTCJul 3, 13:40 UTC1h 50m
2026-07-02 N851AA - Jul 2, 18:50 UTCJul 2, 19:45 UTC55m
2026-07-02 N851AA - Jul 2, 15:00 UTCJul 2, 15:30 UTC30m
2026-07-01 N851AA - Jul 1, 21:55 UTCJul 1, 22:10 UTC15m
2026-07-01 N851AA - Jul 1, 20:50 UTCJul 1, 20:55 UTC5m
2026-07-01 N851AA - Jul 1, 20:00 UTCJul 1, 20:45 UTC45m
2026-06-30 N851AA - Jun 30, 12:40 UTCJun 30, 13:10 UTC30m
2026-06-29 N851AA - Jun 29, 20:35 UTCJun 29, 21:34 UTC1h 0m
2026-06-29 N851AA - Jun 29, 17:40 UTCJun 29, 18:49 UTC1h 10m
2026-06-29 N851AA - Jun 29, 13:39 UTCJun 29, 15:45 UTC2h 5m
2026-06-28 N851AA - Jun 28, 14:34 UTCJun 28, 15:20 UTC45m
2026-06-27 N851AA - Jun 27, 23:19 UTCJun 27, 23:50 UTC30m
2026-06-27 N851AA - Jun 27, 13:20 UTCJun 27, 13:55 UTC35m
2026-06-27 N851AA - Jun 27, 11:59 UTCJun 27, 12:29 UTC30m
2026-06-26 N851AA - Jun 26, 18:15 UTCJun 26, 20:00 UTC1h 45m
2026-06-26 N851AA - Jun 26, 17:19 UTCJun 26, 17:44 UTC25m
2026-06-26 N851AA - Jun 26, 13:10 UTCJun 26, 15:25 UTC2h 15m
2026-06-25 N851AA - Jun 25, 21:25 UTCJun 25, 21:44 UTC20m
2026-06-25 N851AA - Jun 25, 15:04 UTCJun 25, 15:50 UTC45m
2026-06-24 N851AA - Jun 24, 16:34 UTCJun 24, 16:59 UTC25m
2026-06-24 N851AA - Jun 24, 13:44 UTCJun 24, 15:14 UTC1h 30m
2026-06-23 N851AA - Jun 23, 18:45 UTCJun 23, 19:04 UTC20m
2026-06-23 N851AA - Jun 23, 14:44 UTCJun 23, 14:55 UTC10m
2026-06-23 N851AA - Jun 23, 13:05 UTCJun 23, 14:04 UTC1h 0m
2026-06-22 N851AA - Jun 22, 18:35 UTCJun 22, 19:05 UTC30m
2026-06-22 N851AA - Jun 22, 11:44 UTCJun 22, 13:14 UTC1h 30m
2026-06-21 N851AA - Jun 21, 15:44 UTCJun 21, 19:20 UTC3h 35m
2026-06-21 N851AA - Jun 21, 11:59 UTCJun 21, 14:15 UTC2h 15m
2026-06-20 N851AA - Jun 20, 14:50 UTCJun 20, 16:00 UTC1h 10m
2026-06-20 N851AA - Jun 20, 11:49 UTCJun 20, 13:29 UTC1h 40m
2026-06-19 N851AA - Jun 19, 20:34 UTCJun 19, 21:24 UTC50m
2026-06-19 N851AA - Jun 19, 18:39 UTCJun 19, 19:49 UTC1h 10m
2026-06-18 N851AA - Jun 18, 20:40 UTCJun 18, 21:15 UTC35m
2026-06-18 N851AA - Jun 18, 17:40 UTCJun 18, 17:50 UTC10m
2026-06-18 N851AA - Jun 18, 15:05 UTCJun 18, 16:20 UTC1h 15m
2026-06-18 N851AA - Jun 18, 11:55 UTCJun 18, 13:35 UTC1h 40m
2026-06-17 N851AA - Jun 17, 20:25 UTCJun 17, 21:40 UTC1h 15m

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 N851AA page for operator, model, and routing details .

Mode-S ABAB10 frequently asked

What is Mode-S code ABAB10?
ABAB10 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N851AA.
Where is Mode-S ABAB10 registered?
Mode-S code ABAB10 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 ABAB10 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABAB10, octal 52725420, decimal 11,250,448.
What flights does ABAB10 operate?
Mode-S ABAB10 has broadcast 3 distinct callsigns, including N851AA, FDX34, FDX32.