Apparatus

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sensors Mode-S transponder

A6F63B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N548GA · CESSNA 402 Businessliner · operated by HYANNIS AIR SERVICE INC

Hex
A6F63B
Octal
51573073
Decimal
10,942,011
Country
US
Tail
N548GA
Type
C402
No current signal · last broadcast 5h ago
Flights observed
96
Distinct callsigns
16
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A6F63B.

Country allocation

The ICAO 24-bit address A6F63B 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 16 distinct

Callsign Airline Flights Last seen
KAP1903 Cape Air 15 2026-05-24
KAP98 Cape Air 13 2026-05-16
KAP189 Cape Air 12 2026-05-28
KAP350 Cape Air 8 2026-05-14
KAP335 Cape Air 8 2026-06-02
KAP713 Cape Air 7 2026-04-16
KAP87 Cape Air 5 2026-05-03
KAP564 Cape Air 5 2026-05-31
KAP278 Cape Air 5 2026-05-18
KAP131 Cape Air 5 2026-05-19
KAP876 Cape Air 4 2026-05-20
KAP222 Cape Air 4 2026-05-29
KAP592 Cape Air 2 2026-05-23
KAP65 Cape Air 1 2026-05-22
KAP2296 Cape Air 1 2026-05-30
KAP157 Cape Air 1 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 KAP335 SJU → STT Jun 2, 18:15 UTCJun 2, 18:35 UTC20m
2026-06-02 KAP335 SJU → STT Jun 2, 17:10 UTCJun 2, 17:30 UTC20m
2026-06-02 KAP335 SJU → STT Jun 2, 13:50 UTCJun 2, 14:05 UTC15m
2026-06-02 KAP335 SJU → STT Jun 2, 13:00 UTCJun 2, 13:20 UTC20m
2026-06-01 KAP335 SJU → STT Jun 1, 18:55 UTCJun 1, 19:15 UTC20m
2026-06-01 KAP335 SJU → STT Jun 1, 17:50 UTCJun 1, 18:10 UTC20m
2026-06-01 KAP335 SJU → STT Jun 1, 14:05 UTCJun 1, 14:25 UTC20m
2026-06-01 KAP335 SJU → STT Jun 1, 13:10 UTCJun 1, 13:25 UTC15m
2026-05-31 KAP564 STT → STX May 31, 22:50 UTCMay 31, 23:10 UTC20m
2026-05-31 KAP564 STT → STX May 31, 19:50 UTCMay 31, 20:00 UTC10m
2026-05-31 KAP564 STT → STX May 31, 15:25 UTCMay 31, 15:45 UTC20m
2026-05-31 KAP564 STT → STX May 31, 14:40 UTCMay 31, 14:55 UTC15m
2026-05-30 KAP564 STT → STX May 30, 19:30 UTCMay 30, 19:50 UTC20m
2026-05-30 KAP2296 STT → SKB May 30, 15:45 UTCMay 30, 16:00 UTC15m
2026-05-29 KAP222 SJU → VQS May 29, 12:15 UTCMay 29, 12:25 UTC10m
2026-05-28 KAP189 SJU → STT May 28, 16:55 UTCMay 28, 17:50 UTC55m
2026-05-28 KAP189 SJU → STT May 28, 15:20 UTCMay 28, 15:35 UTC15m
2026-05-28 KAP189 SJU → STT May 28, 14:40 UTCMay 28, 14:50 UTC10m
2026-05-28 KAP189 SJU → STT May 28, 12:35 UTCMay 28, 12:45 UTC10m
2026-05-28 KAP189 SJU → STT May 28, 11:50 UTCMay 28, 12:00 UTC10m
2026-05-27 KAP189 SJU → STT May 27, 19:30 UTCMay 27, 19:45 UTC15m
2026-05-24 KAP1903 SJU → STT May 24, 21:00 UTCMay 24, 21:15 UTC15m
2026-05-24 KAP1903 SJU → STT May 24, 17:30 UTCMay 24, 17:55 UTC25m
2026-05-24 KAP1903 SJU → STT May 24, 15:45 UTCMay 24, 16:05 UTC20m
2026-05-24 KAP1903 SJU → STT May 24, 14:50 UTCMay 24, 15:05 UTC15m
2026-05-24 KAP1903 SJU → STT May 24, 14:00 UTCMay 24, 14:10 UTC10m
2026-05-23 KAP1903 SJU → STT May 23, 22:10 UTCMay 23, 22:20 UTC10m
2026-05-23 KAP1903 SJU → STT May 23, 20:40 UTCMay 23, 21:00 UTC20m
2026-05-23 KAP1903 SJU → STT May 23, 16:25 UTCMay 23, 16:35 UTC10m
2026-05-23 KAP592 AXA → SJU May 23, 13:30 UTCMay 23, 13:40 UTC10m
2026-05-22 KAP65 BOS → MVY May 22, 21:40 UTCMay 22, 21:55 UTC15m
2026-05-22 KAP157 SJU → VQS May 22, 19:35 UTCMay 22, 19:55 UTC20m
2026-05-20 KAP876 SJU → STX May 20, 19:05 UTCMay 20, 19:20 UTC15m
2026-05-20 KAP876 SJU → STX May 20, 17:20 UTCMay 20, 17:35 UTC15m
2026-05-20 KAP876 SJU → STX May 20, 15:35 UTCMay 20, 15:55 UTC20m
2026-05-20 KAP876 SJU → STX May 20, 14:00 UTCMay 20, 14:15 UTC15m
2026-05-19 KAP131 STX → SJU May 19, 21:50 UTCMay 19, 22:10 UTC20m
2026-05-19 KAP131 STX → SJU May 19, 20:30 UTCMay 19, 20:50 UTC20m
2026-05-19 KAP131 STX → SJU May 19, 18:35 UTCMay 19, 18:55 UTC20m
2026-05-19 KAP131 STX → SJU May 19, 13:00 UTCMay 19, 13:15 UTC15m
2026-05-18 KAP278 VQS → SJU May 18, 17:35 UTCMay 18, 18:00 UTC25m
2026-05-18 KAP278 VQS → SJU May 18, 15:40 UTCMay 18, 15:50 UTC10m
2026-05-16 KAP98 STX → SJU May 16, 22:10 UTCMay 16, 22:30 UTC20m
2026-05-16 KAP98 STX → SJU May 16, 20:40 UTCMay 16, 21:05 UTC25m
2026-05-16 KAP98 STX → SJU May 16, 18:35 UTCMay 16, 18:45 UTC10m
2026-05-16 KAP98 STX → SJU May 16, 16:15 UTCMay 16, 16:40 UTC25m
2026-05-16 KAP98 STX → SJU May 16, 14:46 UTCMay 16, 14:55 UTC10m
2026-05-16 KAP98 STX → SJU May 16, 13:35 UTCMay 16, 13:51 UTC15m
2026-05-15 KAP98 STX → SJU May 15, 21:15 UTCMay 15, 21:35 UTC20m
2026-05-15 KAP98 STX → SJU May 15, 19:45 UTCMay 15, 20:00 UTC15m

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 N548GA page for operator, model, and routing details .

Mode-S A6F63B frequently asked

What is Mode-S code A6F63B?
A6F63B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N548GA.
Where is Mode-S A6F63B registered?
Mode-S code A6F63B 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 A6F63B broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6F63B, octal 51573073, decimal 10,942,011.
What flights does A6F63B operate?
Mode-S A6F63B has broadcast 16 distinct callsigns, including KAP1903, KAP98, KAP189, KAP350, KAP335.