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sensors Mode-S transponder

A120BE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N172BK · CESSNA 172 Skyhawk · operated by USAEROFLIGHT LLC

Hex
A120BE
Octal
50220276
Decimal
10,559,678
Country
US
Tail
N172BK
Type
C172
No current signal · last broadcast Jul 22, 13:00 UTC
Flights observed
146
Distinct callsigns
1
Country
US
Last broadcast
Jul 22, 13:00 UTC

Last known position

Most recent position reported by Mode-S A120BE.

Country allocation

The ICAO 24-bit address A120BE 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
N172BK - 146 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 N172BK - Jul 22, 12:10 UTCJul 22, 13:00 UTC50m
2026-07-21 N172BK - Jul 21, 19:50 UTCJul 21, 21:20 UTC1h 30m
2026-07-21 N172BK - Jul 21, 17:40 UTCJul 21, 18:35 UTC55m
2026-07-21 N172BK - Jul 21, 13:40 UTCJul 21, 14:25 UTC45m
2026-07-21 N172BK - Jul 21, 04:45 UTCJul 21, 06:20 UTC1h 35m
2026-07-21 N172BK - Jul 21, 02:50 UTCJul 21, 03:55 UTC1h 5m
2026-07-21 N172BK - Jul 21, 01:35 UTCJul 21, 02:10 UTC35m
2026-07-20 N172BK - Jul 20, 17:40 UTCJul 20, 18:55 UTC1h 15m
2026-07-18 N172BK - Jul 18, 15:05 UTCJul 18, 15:30 UTC25m
2026-07-17 N172BK - Jul 17, 14:30 UTCJul 17, 14:55 UTC25m
2026-07-17 N172BK - Jul 17, 11:50 UTCJul 17, 12:00 UTC10m
2026-07-16 N172BK - Jul 16, 19:50 UTCJul 16, 21:15 UTC1h 25m
2026-07-15 N172BK - Jul 15, 20:05 UTCJul 15, 21:15 UTC1h 10m
2026-07-15 N172BK - Jul 15, 12:45 UTCJul 15, 13:10 UTC25m
2026-07-15 N172BK - Jul 15, 11:50 UTCJul 15, 12:15 UTC25m
2026-07-14 N172BK - Jul 14, 20:00 UTCJul 14, 21:20 UTC1h 20m
2026-07-10 N172BK - Jul 10, 14:25 UTCJul 10, 15:20 UTC55m
2026-07-10 N172BK - Jul 10, 12:30 UTCJul 10, 12:45 UTC15m
2026-07-09 N172BK - Jul 9, 14:35 UTCJul 9, 15:40 UTC1h 5m
2026-07-09 N172BK - Jul 9, 12:35 UTCJul 9, 12:55 UTC20m
2026-07-08 N172BK - Jul 8, 17:30 UTCJul 8, 18:05 UTC35m
2026-07-08 N172BK - Jul 8, 14:15 UTCJul 8, 15:30 UTC1h 15m
2026-07-08 N172BK - Jul 8, 11:45 UTCJul 8, 13:00 UTC1h 15m
2026-07-07 N172BK - Jul 7, 19:40 UTCJul 7, 19:50 UTC10m
2026-07-07 N172BK - Jul 7, 14:15 UTCJul 7, 14:35 UTC20m
2026-07-07 N172BK - Jul 7, 11:35 UTCJul 7, 12:05 UTC30m
2026-07-03 N172BK - Jul 3, 14:25 UTCJul 3, 14:35 UTC10m
2026-07-03 N172BK - Jul 3, 11:40 UTCJul 3, 13:15 UTC1h 35m
2026-07-02 N172BK - Jul 2, 22:55 UTCJul 2, 23:15 UTC20m
2026-07-02 N172BK - Jul 2, 19:25 UTCJul 2, 20:10 UTC45m
2026-07-02 N172BK - Jul 2, 18:05 UTCJul 2, 18:45 UTC40m
2026-07-02 N172BK - Jul 2, 11:45 UTCJul 2, 13:05 UTC1h 20m
2026-07-01 N172BK - Jul 1, 17:25 UTCJul 1, 18:15 UTC50m
2026-07-01 N172BK - Jul 1, 11:45 UTCJul 1, 13:00 UTC1h 15m
2026-06-30 N172BK - Jun 30, 20:50 UTCJun 30, 21:30 UTC40m
2026-06-30 N172BK - Jun 30, 18:40 UTCJun 30, 19:30 UTC50m
2026-06-30 N172BK - Jun 30, 11:50 UTCJun 30, 12:30 UTC40m
2026-06-30 N172BK - Jun 30, 02:05 UTCJun 30, 03:00 UTC55m
2026-06-29 N172BK - Jun 29, 18:19 UTCJun 29, 18:49 UTC30m
2026-06-29 N172BK - Jun 29, 14:44 UTCJun 29, 15:45 UTC1h 0m
2026-06-29 N172BK - Jun 29, 11:45 UTCJun 29, 12:24 UTC40m
2026-06-26 N172BK GMU → GMU Jun 26, 19:50 UTCJun 26, 21:15 UTC1h 25m
2026-06-26 N172BK - Jun 26, 11:55 UTCJun 26, 13:24 UTC1h 30m
2026-06-25 N172BK - Jun 25, 17:30 UTCJun 25, 19:44 UTC2h 15m
2026-06-24 N172BK - Jun 24, 17:40 UTCJun 24, 18:50 UTC1h 10m
2026-06-24 N172BK - Jun 24, 14:29 UTCJun 24, 15:54 UTC1h 25m
2026-06-23 N172BK - Jun 23, 19:55 UTCJun 23, 21:05 UTC1h 10m
2026-06-23 N172BK - Jun 23, 17:34 UTCJun 23, 19:04 UTC1h 30m
2026-06-23 N172BK GDC → GMU Jun 23, 14:19 UTCJun 23, 15:44 UTC1h 25m
2026-06-22 N172BK - Jun 22, 11:44 UTCJun 22, 12:44 UTC1h 0m

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 N172BK page for operator, model, and routing details .

Mode-S A120BE frequently asked

What is Mode-S code A120BE?
A120BE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N172BK.
Where is Mode-S A120BE registered?
Mode-S code A120BE 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 A120BE broadcasting right now?
No active broadcast right now. Last signal was Jul 22, 13:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A120BE, octal 50220276, decimal 10,559,678.
What flights does A120BE operate?
Mode-S A120BE has broadcast 1 distinct callsign, including N172BK.