Apparatus

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sensors Mode-S transponder

A6CB23

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N537HF · CESSNA 172R Cutlass RG · operated by SIVER EXPRESS CO DBA, FLYING ACADEMY MIAMI

Hex
A6CB23
Octal
51545443
Decimal
10,930,979
Country
US
Tail
N537HF
Type
C72R
Broadcasting now · callsign N537HF · 2,200 ft
Flights observed
76
Distinct callsigns
1
Country
US
Last broadcast
2h ago

Current position

A6CB23 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A6CB23 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
N537HF - 76 2026-06-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-25 N537HF TMB → TMB Jun 25, 22:29 UTCJun 25, 23:19 UTC50m
2026-06-25 N537HF TMB → TMB Jun 25, 16:50 UTCJun 25, 18:15 UTC1h 25m
2026-06-25 N537HF TMB → TMB Jun 25, 14:50 UTCJun 25, 16:05 UTC1h 15m
2026-06-25 N537HF TMB → TMB Jun 25, 12:50 UTCJun 25, 13:50 UTC1h 0m
2026-06-24 N537HF TMB → TMB Jun 24, 18:50 UTCJun 24, 19:55 UTC1h 5m
2026-06-24 N537HF - Jun 24, 16:29 UTCJun 24, 17:59 UTC1h 30m
2026-06-24 N537HF TMB → TMB Jun 24, 13:14 UTCJun 24, 15:29 UTC2h 15m
2026-06-19 N537HF - Jun 19, 13:14 UTCJun 19, 13:50 UTC35m
2026-06-18 N537HF TMB → TMB Jun 18, 18:35 UTCJun 18, 19:55 UTC1h 20m
2026-06-18 N537HF - Jun 18, 12:50 UTCJun 18, 14:10 UTC1h 20m
2026-06-17 N537HF TMB → TMB Jun 17, 21:05 UTCJun 17, 22:30 UTC1h 25m
2026-06-17 N537HF TMB → TMB Jun 17, 18:50 UTCJun 17, 19:55 UTC1h 5m
2026-06-17 N537HF TMB → TMB Jun 17, 17:15 UTCJun 17, 17:50 UTC35m
2026-06-17 N537HF - Jun 17, 14:15 UTCJun 17, 15:35 UTC1h 20m
2026-06-17 N537HF - Jun 17, 12:55 UTCJun 17, 13:45 UTC50m
2026-06-16 N537HF TMB → TMB Jun 16, 19:05 UTCJun 16, 19:40 UTC35m
2026-06-16 N537HF TMB → TMB Jun 16, 14:35 UTCJun 16, 16:00 UTC1h 25m
2026-06-16 N537HF TMB → TMB Jun 16, 12:55 UTCJun 16, 14:05 UTC1h 10m
2026-06-15 N537HF TMB → TMB Jun 15, 22:59 UTCJun 16, 00:24 UTC1h 25m
2026-06-13 N537HF TMB → TMB Jun 13, 13:55 UTCJun 13, 15:15 UTC1h 20m
2026-06-12 N537HF TMB → TMB Jun 12, 20:50 UTCJun 12, 21:50 UTC1h 0m
2026-06-12 N537HF TMB → TMB Jun 12, 16:40 UTCJun 12, 17:35 UTC55m
2026-06-12 N537HF - Jun 12, 14:15 UTCJun 12, 14:55 UTC40m
2026-06-12 N537HF - Jun 12, 12:05 UTCJun 12, 13:40 UTC1h 35m
2026-06-11 N537HF TMB → TMB Jun 11, 16:45 UTCJun 11, 18:05 UTC1h 20m
2026-06-11 N537HF TMB → TMB Jun 11, 15:00 UTCJun 11, 16:00 UTC1h 0m
2026-06-09 N537HF - Jun 9, 14:50 UTCJun 9, 15:20 UTC30m
2026-06-07 N537HF TMB → TMB Jun 7, 15:15 UTCJun 7, 16:10 UTC55m
2026-06-06 N537HF TMB → TMB Jun 6, 19:34 UTCJun 6, 20:49 UTC1h 15m
2026-06-06 N537HF - Jun 6, 17:19 UTCJun 6, 18:45 UTC1h 25m
2026-06-05 N537HF - Jun 5, 21:10 UTCJun 5, 22:50 UTC1h 40m
2026-06-04 N537HF TMB → TMB Jun 4, 21:00 UTCJun 4, 21:55 UTC55m
2026-06-04 N537HF TMB → TMB Jun 4, 16:40 UTCJun 4, 17:30 UTC50m
2026-06-04 N537HF TMB → TMB Jun 4, 13:20 UTCJun 4, 14:00 UTC40m
2026-06-03 N537HF TMB → TMB Jun 3, 17:00 UTCJun 3, 17:55 UTC55m
2026-06-03 N537HF - Jun 3, 14:45 UTCJun 3, 16:05 UTC1h 20m
2026-06-02 N537HF - Jun 2, 19:00 UTCJun 2, 20:05 UTC1h 5m
2026-06-02 N537HF - Jun 2, 17:05 UTCJun 2, 18:10 UTC1h 5m
2026-06-02 N537HF TMB → TMB Jun 2, 14:40 UTCJun 2, 15:15 UTC35m
2026-06-01 N537HF - Jun 1, 17:05 UTCJun 1, 18:05 UTC1h 0m
2026-05-31 N537HF TMB → TMB May 31, 15:15 UTCMay 31, 17:25 UTC2h 10m
2026-05-31 N537HF - May 31, 00:20 UTCMay 31, 00:50 UTC30m
2026-05-30 N537HF - May 30, 19:15 UTCMay 30, 19:55 UTC40m
2026-05-30 N537HF - May 30, 17:05 UTCMay 30, 17:35 UTC30m
2026-05-30 N537HF TMB → TMB May 30, 14:55 UTCMay 30, 15:55 UTC1h 0m
2026-05-29 N537HF - May 29, 19:05 UTCMay 29, 19:50 UTC45m
2026-05-28 N537HF TMB → TMB May 28, 21:15 UTCMay 28, 21:40 UTC25m
2026-05-28 N537HF - May 28, 17:20 UTCMay 28, 17:55 UTC35m
2026-05-27 N537HF - May 27, 18:10 UTCMay 27, 20:35 UTC2h 25m
2026-05-27 N537HF TMB → MLB May 27, 15:10 UTCMay 27, 16:55 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 N537HF page for operator, model, and routing details .

Mode-S A6CB23 frequently asked

What is Mode-S code A6CB23?
A6CB23 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N537HF.
Where is Mode-S A6CB23 registered?
Mode-S code A6CB23 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 A6CB23 broadcasting right now?
Yes. Mode-S A6CB23 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6CB23, octal 51545443, decimal 10,930,979.
What flights does A6CB23 operate?
Mode-S A6CB23 has broadcast 1 distinct callsign, including N537HF.