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sensors Mode-S transponder

ADD65B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N991AA · CESSNA 402 Businessliner · operated by HYANNIS AIR SERVICE INC DBA, CAPE AIR

Hex
ADD65B
Octal
53353133
Decimal
11,392,603
Country
US
Tail
N991AA
Type
C402
Broadcasting now · callsign KAP3061 · 3,975 ft
Flights observed
271
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Current position

ADD65B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address ADD65B 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
KAP11 Cape Air 22 2026-04-25
KAP98 - 21 2026-07-03
KAP91 Cape Air 21 2026-05-08
KAP747 - 17 2026-06-25
KAP627 - 16 2026-07-13
KAP186 - 15 2026-07-04
KAP713 Cape Air 12 2026-06-29
KAP278 Cape Air 12 2026-06-11
KAP350 - 7 2026-07-05
KAP5573 Cape Air 6 2026-06-03
KAP95 Cape Air 5 2026-06-02
KAP8380 Cape Air 5 2026-06-04
KAP78 - 5 2026-07-09
KAP369 Cape Air 5 2026-06-10
KAP157 Cape Air 5 2026-05-15
KAP85 - 4 2026-06-28
KAP811 - 4 2026-07-13
KAP202 Cape Air 4 2026-05-16
KAP1279 Cape Air 4 2026-06-14
KAP110 Cape Air 4 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 KAP3081 - Jul 17, 19:05 UTCJul 17, 19:35 UTC30m
2026-07-17 KAP3252 BOS → MVY Jul 17, 17:30 UTCJul 17, 17:55 UTC25m
2026-07-17 KAP3242 - Jul 17, 16:19 UTCJul 17, 16:44 UTC25m
2026-07-17 KAP1022 - Jul 17, 15:25 UTCJul 17, 15:35 UTC10m
2026-07-17 KAP3291 - Jul 17, 00:35 UTCJul 17, 01:39 UTC1h 5m
2026-07-16 KAP3061 - Jul 16, 22:25 UTCJul 16, 23:05 UTC40m
2026-07-16 KAP3171 BOS → MVY Jul 16, 20:29 UTCJul 16, 20:55 UTC25m
2026-07-16 KAP3081 - Jul 16, 19:05 UTCJul 16, 19:40 UTC35m
2026-07-14 KAP5331 - Jul 14, 20:30 UTCJul 14, 21:00 UTC30m
2026-07-14 KAP5061 - Jul 14, 18:50 UTCJul 14, 19:25 UTC35m
2026-07-14 KAP876 - Jul 14, 17:10 UTCJul 14, 17:40 UTC30m
2026-07-14 KAP216 - Jul 14, 14:35 UTCJul 14, 15:40 UTC1h 5m
2026-07-13 KAP418 - Jul 13, 23:05 UTCJul 14, 00:05 UTC1h 0m
2026-07-13 KAP5601 - Jul 13, 21:20 UTCJul 13, 22:05 UTC45m
2026-07-13 KAP811 - Jul 13, 18:00 UTCJul 13, 19:10 UTC1h 10m
2026-07-13 KAP811 - Jul 13, 15:00 UTCJul 13, 16:30 UTC1h 30m
2026-07-13 KAP811 - Jul 13, 13:20 UTCJul 13, 13:50 UTC30m
2026-07-13 KAP811 - Jul 13, 12:15 UTCJul 13, 12:40 UTC25m
2026-07-13 KAP627 - Jul 13, 00:20 UTCJul 13, 01:25 UTC1h 5m
2026-07-12 KAP5381 - Jul 12, 23:15 UTCJul 12, 23:50 UTC35m
2026-07-12 KAP627 - Jul 12, 22:05 UTCJul 12, 22:35 UTC30m
2026-07-12 KAP5341 - Jul 12, 20:35 UTCJul 12, 21:15 UTC40m
2026-07-12 KAP627 - Jul 12, 18:55 UTCJul 12, 19:30 UTC35m
2026-07-12 KAP627 - Jul 12, 17:40 UTCJul 12, 18:10 UTC30m
2026-07-12 KAP627 - Jul 12, 16:30 UTCJul 12, 16:45 UTC15m
2026-07-11 KAP707 - Jul 11, 18:55 UTCJul 11, 19:35 UTC40m
2026-07-11 KAP627 - Jul 11, 01:15 UTCJul 11, 01:35 UTC20m
2026-07-10 KAP627 - Jul 10, 23:35 UTCJul 11, 00:10 UTC35m
2026-07-10 KAP627 - Jul 10, 22:15 UTCJul 10, 22:45 UTC30m
2026-07-10 KAP627 - Jul 10, 20:25 UTCJul 10, 20:55 UTC30m
2026-07-10 KAP627 - Jul 10, 19:00 UTCJul 10, 19:25 UTC25m
2026-07-10 KAP627 - Jul 10, 17:50 UTCJul 10, 18:15 UTC25m
2026-07-09 KAP78 - Jul 9, 22:05 UTCJul 9, 22:30 UTC25m
2026-07-09 KAP78 BOS → OWD Jul 9, 20:20 UTCJul 9, 20:30 UTC10m
2026-07-09 KAP78 - Jul 9, 16:40 UTCJul 9, 17:10 UTC30m
2026-07-07 KAPT818 - Jul 7, 18:05 UTCJul 7, 19:40 UTC1h 35m
2026-07-07 KAPT818 - Jul 7, 13:05 UTCJul 7, 14:50 UTC1h 45m
2026-07-06 KAP627 - Jul 6, 01:20 UTCJul 6, 01:50 UTC30m
2026-07-06 KAP627 - Jul 6, 00:15 UTCJul 6, 00:45 UTC30m
2026-07-05 KAP627 - Jul 5, 23:00 UTCJul 5, 23:30 UTC30m
2026-07-05 KAP627 - Jul 5, 21:20 UTCJul 5, 21:50 UTC30m
2026-07-05 KAP627 - Jul 5, 19:55 UTCJul 5, 20:30 UTC35m
2026-07-05 KAP350 - Jul 5, 18:30 UTCJul 5, 19:05 UTC35m
2026-07-05 KAP350 - Jul 5, 16:10 UTCJul 5, 16:40 UTC30m
2026-07-05 KAP350 - Jul 5, 14:05 UTCJul 5, 15:25 UTC1h 20m
2026-07-04 KAP186 - Jul 4, 21:55 UTCJul 4, 22:50 UTC55m
2026-07-04 KAP1838 - Jul 4, 19:45 UTCJul 4, 21:00 UTC1h 15m
2026-07-04 KAP186 - Jul 4, 14:30 UTCJul 4, 15:30 UTC1h 0m
2026-07-04 KAP1832 - Jul 4, 12:10 UTCJul 4, 13:20 UTC1h 10m
2026-07-03 KAP98 - Jul 3, 22:45 UTCJul 3, 23:50 UTC1h 5m

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 N991AA page for operator, model, and routing details .

Mode-S ADD65B frequently asked

What is Mode-S code ADD65B?
ADD65B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N991AA.
Where is Mode-S ADD65B registered?
Mode-S code ADD65B 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 ADD65B broadcasting right now?
Yes. Mode-S ADD65B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADD65B, octal 53353133, decimal 11,392,603.
What flights does ADD65B operate?
Mode-S ADD65B has broadcast 20 distinct callsigns, including KAP11, KAP98, KAP91, KAP747, KAP627.