Apparatus

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sensors Mode-S transponder

AD424B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N9531D · CESSNA 172R Cutlass RG · operated by ATP AIRCRAFT 4 LLC

Hex
AD424B
Octal
53241113
Decimal
11,354,699
Country
US
Tail
N9531D
Type
C72R
No current signal · last broadcast 20h ago
Flights observed
192
Distinct callsigns
1
Country
US
Last broadcast
20h ago

Last known position

Most recent position reported by Mode-S AD424B.

Country allocation

The ICAO 24-bit address AD424B 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
CXK191 - 192 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CXK191 - Jul 13, 16:20 UTCJul 13, 17:35 UTC1h 15m
2026-07-10 CXK191 CLD → CLD Jul 10, 23:05 UTCJul 11, 00:10 UTC1h 5m
2026-07-10 CXK191 - Jul 10, 20:45 UTCJul 10, 21:40 UTC55m
2026-07-09 CXK191 - Jul 9, 20:50 UTCJul 9, 22:05 UTC1h 15m
2026-07-08 CXK191 - Jul 8, 16:30 UTCJul 8, 17:15 UTC45m
2026-07-08 CXK191 - Jul 8, 03:40 UTCJul 8, 06:10 UTC2h 30m
2026-07-07 CXK191 OCN → CLD Jul 7, 21:20 UTCJul 7, 21:45 UTC25m
2026-07-07 CXK191 OCN → OCN Jul 7, 20:55 UTCJul 7, 21:05 UTC10m
2026-07-07 CXK191 OCN → OCN Jul 7, 20:30 UTCJul 7, 20:40 UTC10m
2026-07-07 CXK191 - Jul 7, 20:05 UTCJul 7, 20:15 UTC10m
2026-07-06 CXK191 - Jul 6, 15:40 UTCJul 6, 16:40 UTC1h 0m
2026-07-04 CXK191 CLD → CLD Jul 4, 18:05 UTCJul 4, 19:15 UTC1h 10m
2026-07-03 CXK191 CLD → CLD Jul 3, 21:05 UTCJul 3, 21:50 UTC45m
2026-07-03 CXK191 CLD → CLD Jul 3, 16:05 UTCJul 3, 17:15 UTC1h 10m
2026-07-02 CXK191 - Jul 2, 21:50 UTCJul 2, 22:15 UTC25m
2026-07-02 CXK191 - Jul 2, 20:55 UTCJul 2, 21:45 UTC50m
2026-07-02 CXK191 - Jul 2, 19:05 UTCJul 2, 19:25 UTC20m
2026-07-02 CXK191 OCN → OCN Jul 2, 18:50 UTCJul 2, 19:00 UTC10m
2026-07-02 CXK191 OCN → OCN Jul 2, 18:25 UTCJul 2, 18:35 UTC10m
2026-07-02 CXK191 OCN → OCN Jul 2, 18:05 UTCJul 2, 18:20 UTC15m
2026-07-02 CXK191 - Jul 2, 17:45 UTCJul 2, 18:00 UTC15m
2026-07-02 CXK191 - Jul 2, 17:25 UTCJul 2, 17:40 UTC15m
2026-07-02 CXK191 - Jul 2, 04:40 UTCJul 2, 06:15 UTC1h 35m
2026-07-02 CXK191 - Jul 2, 01:25 UTCJul 2, 03:00 UTC1h 35m
2026-07-01 CXK191 OCN → CLD Jul 1, 22:10 UTCJul 1, 22:25 UTC15m
2026-07-01 CXK191 OCN → OCN Jul 1, 21:45 UTCJul 1, 22:05 UTC20m
2026-07-01 CXK191 - Jul 1, 21:20 UTCJul 1, 21:30 UTC10m
2026-07-01 CXK191 - Jul 1, 16:05 UTCJul 1, 16:15 UTC10m
2026-07-01 CXK191 - Jul 1, 15:40 UTCJul 1, 16:00 UTC20m
2026-06-30 CXK191 - Jun 30, 18:35 UTCJun 30, 19:30 UTC55m
2026-06-30 CXK191 OCN → OCN Jun 30, 18:20 UTCJun 30, 18:30 UTC10m
2026-06-30 CXK191 CLD → OCN Jun 30, 17:30 UTCJun 30, 18:15 UTC45m
2026-06-29 CXK191 - Jun 29, 23:09 UTCJun 30, 00:20 UTC1h 10m
2026-06-29 CXK191 CLD → CLD Jun 29, 21:14 UTCJun 29, 22:30 UTC1h 15m
2026-06-27 CXK191 OCN → CLD Jun 27, 19:39 UTCJun 27, 19:55 UTC15m
2026-06-27 CXK191 OCN → OCN Jun 27, 19:15 UTCJun 27, 19:24 UTC10m
2026-06-27 CXK191 - Jun 27, 18:54 UTCJun 27, 19:09 UTC15m
2026-06-26 CXK191 - Jun 26, 22:55 UTCJun 26, 23:04 UTC10m
2026-06-26 CXK191 - Jun 26, 21:20 UTCJun 26, 22:40 UTC1h 20m
2026-06-26 CXK191 CLD → OCN Jun 26, 20:29 UTCJun 26, 21:15 UTC45m
2026-06-26 CXK191 OCN → CLD Jun 26, 18:09 UTCJun 26, 19:20 UTC1h 10m
2026-06-26 CXK191 - Jun 26, 17:35 UTCJun 26, 17:44 UTC10m
2026-06-26 CXK191 - Jun 26, 15:34 UTCJun 26, 16:44 UTC1h 10m
2026-06-25 CXK191 OCN → CLD Jun 25, 23:59 UTCJun 26, 00:15 UTC15m
2026-06-25 CXK191 - Jun 25, 22:45 UTCJun 25, 23:55 UTC1h 10m
2026-06-23 CXK191 - Jun 23, 23:14 UTCJun 23, 23:39 UTC25m
2026-06-23 CXK191 MYF → MYF Jun 23, 17:30 UTCJun 23, 20:04 UTC2h 35m
2026-06-23 CXK191 MYF → MYF Jun 23, 00:35 UTCJun 23, 02:09 UTC1h 35m
2026-06-22 CXK191 MYF → MYF Jun 22, 22:15 UTCJun 22, 23:39 UTC1h 25m
2026-06-21 CXK191 - Jun 21, 22:10 UTCJun 21, 22:54 UTC45m

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 N9531D page for operator, model, and routing details .

Mode-S AD424B frequently asked

What is Mode-S code AD424B?
AD424B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N9531D.
Where is Mode-S AD424B registered?
Mode-S code AD424B 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 AD424B broadcasting right now?
No active broadcast right now. Last signal was 20h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD424B, octal 53241113, decimal 11,354,699.
What flights does AD424B operate?
Mode-S AD424B has broadcast 1 distinct callsign, including CXK191.