Apparatus

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sensors Mode-S transponder

A4CE33

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N409BK · CESSNA 402 Businessliner · operated by HYANNIS AIR SERVICE INC DBA, CAPE AIR

Hex
A4CE33
Octal
51147063
Decimal
10,800,691
Country
US
Tail
N409BK
Type
C402
Transponder active on ground
Flights observed
241
Distinct callsigns
20
Country
US
Last broadcast
38m ago

Last known position

Most recent position reported by Mode-S A4CE33.

Country allocation

The ICAO 24-bit address A4CE33 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
KAP412 Cape Air 17 2026-05-01
KAP548 Cape Air 15 2026-06-02
KAP333 Cape Air 15 2026-05-21
KAP278 - 13 2026-07-13
KAP111 - 10 2026-07-08
KAP916 - 9 2026-07-01
KAP5573 - 8 2026-04-18
KAP1026 Cape Air 8 2026-04-20
KAP426 - 7 2026-07-13
KAP42 Cape Air 6 2026-05-04
KAP321 Cape Air 6 2026-05-04
KAP115 Cape Air 5 2026-06-10
KAP100 Cape Air 5 2026-06-21
KAP95 - 4 2026-06-19
KAP902 Cape Air 4 2026-05-13
KAP763 - 4 2026-06-19
KAP713 Cape Air 4 2026-06-17
KAP527 Cape Air 4 2026-05-03
KAP241 Cape Air 4 2026-05-31
KAP10 Cape Air 4 2026-04-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 KAP1836 - Jul 14, 13:35 UTCJul 14, 14:45 UTC1h 10m
2026-07-13 KAP278 - Jul 13, 23:25 UTCJul 14, 00:30 UTC1h 5m
2026-07-13 KAP426 - Jul 13, 18:50 UTCJul 13, 19:45 UTC55m
2026-07-13 KAP426 - Jul 13, 15:35 UTCJul 13, 16:40 UTC1h 5m
2026-07-13 KAP426 - Jul 13, 13:25 UTCJul 13, 14:00 UTC35m
2026-07-11 KAP186 - Jul 11, 21:15 UTCJul 11, 21:45 UTC30m
2026-07-11 KAP1002 - Jul 11, 16:00 UTCJul 11, 16:35 UTC35m
2026-07-11 KAP186 - Jul 11, 13:00 UTCJul 11, 13:30 UTC30m
2026-07-11 KAP1000 AUG → BOS Jul 11, 11:40 UTCJul 11, 12:15 UTC35m
2026-07-08 KAP111 - Jul 8, 23:00 UTCJul 8, 23:35 UTC35m
2026-07-08 KAP111 - Jul 8, 22:05 UTCJul 8, 22:40 UTC35m
2026-07-08 KAP111 - Jul 8, 19:45 UTCJul 8, 20:10 UTC25m
2026-07-08 KAP111 - Jul 8, 18:20 UTCJul 8, 18:45 UTC25m
2026-07-08 KAP111 - Jul 8, 15:00 UTCJul 8, 15:30 UTC30m
2026-07-08 KAP111 - Jul 8, 13:15 UTCJul 8, 13:55 UTC40m
2026-07-07 KAP111 - Jul 7, 23:30 UTCJul 8, 00:10 UTC40m
2026-07-07 KAP7181 - Jul 7, 21:30 UTCJul 7, 22:00 UTC30m
2026-07-07 KAP203 - Jul 7, 00:15 UTCJul 7, 01:25 UTC1h 10m
2026-07-06 KAP5381 ACK → BOS Jul 6, 23:05 UTCJul 6, 23:35 UTC30m
2026-07-06 KAP203 - Jul 6, 21:05 UTCJul 6, 21:50 UTC45m
2026-07-06 KAP5261 ACK → BOS Jul 6, 19:45 UTCJul 6, 20:15 UTC30m
2026-07-06 KAP203 - Jul 6, 18:00 UTCJul 6, 18:35 UTC35m
2026-07-06 KAP7021 - Jul 6, 17:00 UTCJul 6, 17:25 UTC25m
2026-07-05 KAP7171 - Jul 5, 19:15 UTCJul 5, 19:35 UTC20m
2026-07-05 KAP5162 - Jul 5, 17:45 UTCJul 5, 18:25 UTC40m
2026-07-05 KAP876 - Jul 5, 16:20 UTCJul 5, 16:50 UTC30m
2026-07-05 KAP5302 - Jul 5, 14:45 UTCJul 5, 15:15 UTC30m
2026-07-05 KAP876 - Jul 5, 12:50 UTCJul 5, 13:20 UTC30m
2026-07-05 KAP876 - Jul 5, 11:20 UTCJul 5, 11:50 UTC30m
2026-07-01 KAP916 - Jul 1, 21:15 UTCJul 1, 21:25 UTC10m
2026-07-01 KAP916 - Jul 1, 18:20 UTCJul 1, 19:50 UTC1h 30m
2026-07-01 KAP916 - Jul 1, 15:45 UTCJul 1, 17:15 UTC1h 30m
2026-07-01 KAP916 - Jul 1, 11:20 UTCJul 1, 11:30 UTC10m
2026-06-29 KAPT787 - Jun 29, 22:39 UTCJun 30, 00:14 UTC1h 35m
2026-06-23 KAP1843 - Jun 23, 22:44 UTCJun 23, 23:44 UTC1h 0m
2026-06-23 KAP3162 - Jun 23, 20:15 UTCJun 23, 20:44 UTC30m
2026-06-23 KAP3232 BOS → MVY Jun 23, 15:50 UTCJun 23, 16:20 UTC30m
2026-06-23 KAP1836 - Jun 23, 13:15 UTCJun 23, 14:35 UTC1h 20m
2026-06-23 KAP1843 - Jun 23, 00:09 UTCJun 23, 01:00 UTC50m
2026-06-22 KAP5281 ACK → BOS Jun 22, 22:34 UTCJun 22, 23:10 UTC35m
2026-06-22 KAP5211 - Jun 22, 20:14 UTCJun 22, 20:49 UTC35m
2026-06-21 KAP8380 BOS → BOS Jun 21, 22:15 UTCJun 22, 00:10 UTC1h 55m
2026-06-21 KAP426 BOS → AUG Jun 21, 19:14 UTCJun 21, 19:55 UTC40m
2026-06-21 KAP426 BOS → AUG Jun 21, 17:29 UTCJun 21, 17:54 UTC25m
2026-06-21 KAP5021 ACK → BOS Jun 21, 14:44 UTCJun 21, 15:19 UTC35m
2026-06-21 KAP100 ORD → STL Jun 21, 12:55 UTCJun 21, 13:20 UTC25m
2026-06-21 KAP100 ORD → STL Jun 21, 11:24 UTCJun 21, 12:10 UTC45m
2026-06-20 KAP100 ORD → STL Jun 20, 22:05 UTCJun 20, 22:50 UTC45m
2026-06-20 KAP100 ORD → STL Jun 20, 18:14 UTCJun 20, 19:04 UTC50m
2026-06-20 KAP100 ORD → STL Jun 20, 14:59 UTCJun 20, 15:54 UTC55m

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 N409BK page for operator, model, and routing details .

Mode-S A4CE33 frequently asked

What is Mode-S code A4CE33?
A4CE33 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N409BK.
Where is Mode-S A4CE33 registered?
Mode-S code A4CE33 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 A4CE33 broadcasting right now?
Mode-S A4CE33 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4CE33, octal 51147063, decimal 10,800,691.
What flights does A4CE33 operate?
Mode-S A4CE33 has broadcast 20 distinct callsigns, including KAP412, KAP548, KAP333, KAP278, KAP111.