Apparatus

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sensors Mode-S transponder

A4B4C5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N402HG · CESSNA 402 Businessliner · operated by HYANNIS AIR SERVICE INC DBA, CAPE AIR

Hex
A4B4C5
Octal
51132305
Decimal
10,794,181
Country
US
Tail
N402HG
Type
C402
No current signal · last broadcast 1d ago
Flights observed
302
Distinct callsigns
20
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A4B4C5.

Country allocation

The ICAO 24-bit address A4B4C5 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 20 distinct

Callsign Airline Flights Last seen
KAP14 - 32 2026-06-30
KAP325 Cape Air 19 2026-04-23
KAP155 - 16 2026-06-14
KAP350 - 14 2026-06-27
KAP296 Cape Air 12 2026-06-11
KAP1271 Cape Air 12 2026-06-03
KAP916 Cape Air 10 2026-05-28
KAP42 Cape Air 10 2026-06-11
KAP413 Cape Air 9 2026-05-25
KAP78 Cape Air 8 2026-06-13
KAP109 - 8 2026-07-10
KAP519 Cape Air 7 2026-05-16
KAP747 - 6 2026-06-17
KAP115 Cape Air 6 2026-05-02
KAP54 Cape Air 5 2026-05-31
KAP111 Cape Air 5 2026-06-12
KAP110 - 5 2026-07-12
KAP818 Cape Air 4 2026-05-05
KAP635 Cape Air 4 2026-06-08
KAP548 Cape Air 4 2026-05-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 KAP110 - Jul 12, 17:01 UTCJul 12, 18:10 UTC1h 10m
2026-07-12 KAP110 - Jul 12, 14:20 UTCJul 12, 15:45 UTC1h 25m
2026-07-11 KAP110 - Jul 11, 21:35 UTCJul 11, 22:45 UTC1h 10m
2026-07-11 KAP110 - Jul 11, 19:25 UTCJul 11, 20:35 UTC1h 10m
2026-07-11 KAP110 - Jul 11, 15:50 UTCJul 11, 17:05 UTC1h 15m
2026-07-11 KAP627 - Jul 11, 14:40 UTCJul 11, 15:10 UTC30m
2026-07-10 KAP109 - Jul 10, 00:15 UTCJul 10, 00:25 UTC10m
2026-07-09 KAP109 - Jul 9, 23:00 UTCJul 9, 23:20 UTC20m
2026-07-09 KAP109 - Jul 9, 22:05 UTCJul 9, 22:25 UTC20m
2026-07-09 KAP109 - Jul 9, 18:50 UTCJul 9, 20:10 UTC1h 20m
2026-07-09 KAP109 - Jul 9, 15:50 UTCJul 9, 17:25 UTC1h 35m
2026-07-08 KAP109 - Jul 8, 22:45 UTCJul 8, 23:10 UTC25m
2026-07-08 KAP109 - Jul 8, 21:25 UTCJul 8, 21:50 UTC25m
2026-07-08 KAP109 - Jul 8, 15:55 UTCJul 8, 16:10 UTC15m
2026-07-07 KAP418 - Jul 7, 16:30 UTCJul 7, 16:55 UTC25m
2026-07-07 KAP216 - Jul 7, 14:30 UTCJul 7, 15:25 UTC55m
2026-07-06 KAP418 - Jul 6, 23:30 UTCJul 7, 00:40 UTC1h 10m
2026-07-06 KAP5601 ACK → BOS Jul 6, 21:50 UTCJul 6, 22:20 UTC30m
2026-07-06 KAP418 - Jul 6, 19:45 UTCJul 6, 20:00 UTC15m
2026-07-06 KAP418 - Jul 6, 16:10 UTCJul 6, 16:30 UTC20m
2026-07-06 KAP216 - Jul 6, 14:20 UTCJul 6, 15:15 UTC55m
2026-07-05 KAP217 BOS → ISP Jul 5, 23:45 UTCJul 6, 00:45 UTC1h 0m
2026-07-05 KAP216 - Jul 5, 21:35 UTCJul 5, 22:35 UTC1h 0m
2026-07-05 KAP219 - Jul 5, 15:15 UTCJul 5, 16:20 UTC1h 5m
2026-07-05 KAP212 - Jul 5, 13:20 UTCJul 5, 14:10 UTC50m
2026-07-04 KAP235 MVY → ISP Jul 4, 22:45 UTCJul 5, 00:15 UTC1h 30m
2026-07-04 KAP235 BOS → MVY Jul 4, 21:45 UTCJul 4, 22:10 UTC25m
2026-07-04 KAP5201 - Jul 4, 20:05 UTCJul 4, 20:35 UTC30m
2026-07-04 KAP235 - Jul 4, 18:50 UTCJul 4, 19:00 UTC10m
2026-07-03 KAP2011 - Jul 3, 13:55 UTCJul 3, 15:00 UTC1h 5m
2026-07-03 KAP15 EWB → ACK Jul 3, 12:50 UTCJul 3, 13:10 UTC20m
2026-07-02 KAP2171 BOS → PVC Jul 2, 23:05 UTCJul 2, 23:25 UTC20m
2026-07-02 KAP2341 PVC → BOS Jul 2, 21:50 UTCJul 2, 22:15 UTC25m
2026-07-02 KAP2052 BOS → PVC Jul 2, 19:10 UTCJul 2, 19:30 UTC20m
2026-07-02 KAP2142 - Jul 2, 17:55 UTCJul 2, 18:15 UTC20m
2026-07-02 KAP2032 BOS → PVC Jul 2, 16:50 UTCJul 2, 17:10 UTC20m
2026-07-02 KAP15 EWB → ACK Jul 2, 15:45 UTCJul 2, 16:00 UTC15m
2026-07-02 KAP2091 - Jul 2, 00:05 UTCJul 2, 00:25 UTC20m
2026-07-01 KAP6102 BOS → BOS Jul 1, 22:20 UTCJul 2, 00:00 UTC1h 40m
2026-07-01 KAP2341 PVC → BOS Jul 1, 20:25 UTCJul 1, 20:50 UTC25m
2026-07-01 KAP2091 - Jul 1, 00:20 UTCJul 1, 00:40 UTC20m
2026-06-30 KAP6103 - Jun 30, 23:15 UTCJun 30, 23:50 UTC35m
2026-06-30 KAP2171 BOS → PVC Jun 30, 21:40 UTCJun 30, 22:00 UTC20m
2026-06-30 KAP2341 PVC → BOS Jun 30, 20:20 UTCJun 30, 20:55 UTC35m
2026-06-30 KAP2051 BOS → PVC Jun 30, 18:55 UTCJun 30, 19:15 UTC20m
2026-06-30 KAP14 - Jun 30, 13:00 UTCJun 30, 13:50 UTC50m
2026-06-29 KAP14 BOS → RKD Jun 29, 23:39 UTCJun 30, 00:35 UTC55m
2026-06-29 KAP902 - Jun 29, 20:09 UTCJun 29, 21:24 UTC1h 15m
2026-06-29 KAP902 - Jun 29, 17:24 UTCJun 29, 18:34 UTC1h 10m
2026-06-29 KAP902 BOS → JFK Jun 29, 15:14 UTCJun 29, 16:25 UTC1h 10m

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 N402HG page for operator, model, and routing details .

Mode-S A4B4C5 frequently asked

What is Mode-S code A4B4C5?
A4B4C5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N402HG.
Where is Mode-S A4B4C5 registered?
Mode-S code A4B4C5 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 A4B4C5 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4B4C5, octal 51132305, decimal 10,794,181.
What flights does A4B4C5 operate?
Mode-S A4B4C5 has broadcast 20 distinct callsigns, including KAP14, KAP325, KAP155, KAP350, KAP296.