Apparatus

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sensors Mode-S transponder

A8BF91

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N663CA · BOEING 747-400 · operated by AC SPE 9 LLC

Hex
A8BF91
Octal
52137621
Decimal
11,059,089
Country
US
Tail
N663CA
Type
B744
No current signal · last broadcast Jul 26, 20:05 UTC
Flights observed
160
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:05 UTC

Last known position

Most recent position reported by Mode-S A8BF91.

Country allocation

The ICAO 24-bit address A8BF91 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
NCR4818 - 10 2026-04-18
NCR873 - 6 2026-07-14
NCR846 National Air Cargo 5 2026-07-24
NCR824 - 5 2026-07-26
NCR862 - 4 2026-06-10
NCR825 - 4 2026-06-25
NCR822 - 4 2026-04-30
NCR934 - 3 2026-05-29
NCR852 - 3 2026-06-23
NCR812 National Air Cargo 3 2026-06-06
NCR808 - 3 2026-06-17
NCR803 National Air Cargo 3 2026-07-19
NCR601 National Air Cargo 3 2026-06-15
NCR4821 - 3 2026-06-14
NCR4805 - 3 2026-07-16
NCR440 - 3 2026-05-03
NCR894 - 2 2026-07-07
NCR884 - 2 2026-05-07
NCR869 - 2 2026-06-21
NCR854 National Air Cargo 2 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 NCR824 - Jul 26, 07:40 UTCJul 26, 20:05 UTC12h 25m
2026-07-24 NCR846 YMX → SJK Jul 24, 18:40 UTCJul 25, 07:45 UTC13h 5m
2026-07-24 NCR846 YMX → SJK Jul 24, 15:20 UTCJul 24, 15:45 UTC25m
2026-07-24 NCR846 YMX → SJK Jul 24, 10:05 UTCJul 24, 11:45 UTC1h 40m
2026-07-24 NCR846 YMX → SJK Jul 24, 09:15 UTCJul 24, 09:30 UTC15m
2026-07-24 NCR846 YMX → SJK Jul 24, 00:55 UTCJul 24, 03:55 UTC3h 0m
2026-07-23 NCR503 - Jul 23, 05:45 UTCJul 23, 19:10 UTC13h 25m
2026-07-23 NCR503 - Jul 23, 03:35 UTCJul 23, 03:50 UTC15m
2026-07-22 NCR502 ICN → HKG Jul 22, 17:35 UTCJul 22, 20:30 UTC2h 55m
2026-07-22 NCR893 - Jul 22, 11:40 UTCJul 22, 14:35 UTC2h 55m
2026-07-21 NCR801 - Jul 21, 14:50 UTCJul 22, 03:35 UTC12h 45m
2026-07-21 NCR800 - Jul 21, 04:15 UTCJul 21, 10:35 UTC6h 20m
2026-07-20 NCR4822 - Jul 20, 16:05 UTCJul 20, 23:00 UTC6h 55m
2026-07-19 NCR803 JFK → LGG Jul 19, 20:30 UTCJul 20, 04:30 UTC8h 0m
2026-07-18 NCR548 - Jul 18, 09:25 UTCJul 18, 20:15 UTC10h 50m
2026-07-18 NCR548 - Jul 18, 07:20 UTCJul 18, 07:35 UTC15m
2026-07-17 NCR547 - Jul 17, 07:20 UTCJul 17, 07:50 UTC30m
2026-07-16 NCR547 - Jul 16, 21:35 UTCJul 16, 22:30 UTC55m
2026-07-16 NCR836 - Jul 16, 12:44 UTCJul 16, 18:10 UTC5h 25m
2026-07-16 NCR835 - Jul 16, 08:00 UTCJul 16, 08:55 UTC55m
2026-07-16 NCR4805 - Jul 16, 03:40 UTCJul 16, 04:05 UTC25m
2026-07-15 NCR4805 - Jul 15, 23:30 UTCJul 16, 00:20 UTC50m
2026-07-15 NCR4805 - Jul 15, 18:05 UTCJul 15, 21:25 UTC3h 20m
2026-07-14 NCR880 - Jul 14, 23:05 UTCJul 15, 08:55 UTC9h 50m
2026-07-14 NCR873 - Jul 14, 20:20 UTCJul 14, 22:20 UTC2h 0m
2026-07-14 NCR569 - Jul 14, 11:10 UTCJul 14, 14:25 UTC3h 15m
2026-07-14 NCR569 - Jul 14, 09:20 UTCJul 14, 09:30 UTC10m
2026-07-13 NCR4801 - Jul 13, 07:20 UTCJul 13, 07:40 UTC20m
2026-07-13 NCR4801 - Jul 13, 01:50 UTCJul 13, 05:25 UTC3h 35m
2026-07-12 NCR899 - Jul 12, 08:01 UTCJul 12, 09:00 UTC1h 0m
2026-07-12 NCR898 - Jul 12, 00:50 UTCJul 12, 05:30 UTC4h 40m
2026-07-11 NCR4832 - Jul 11, 09:00 UTCJul 11, 09:20 UTC20m
2026-07-11 NCR4832 - Jul 11, 03:20 UTCJul 11, 06:55 UTC3h 35m
2026-07-10 NCR4834 - Jul 10, 13:20 UTCJul 10, 22:50 UTC9h 30m
2026-07-10 NCR803 - Jul 10, 04:30 UTCJul 10, 08:40 UTC4h 10m
2026-07-09 NCR803 MXP → BGR Jul 9, 18:45 UTCJul 10, 02:00 UTC7h 15m
2026-07-09 NCR4831 - Jul 9, 09:25 UTCJul 9, 09:40 UTC15m
2026-07-09 NCR4835 - Jul 9, 00:20 UTCJul 9, 01:20 UTC1h 0m
2026-07-08 NCR4835 - Jul 8, 18:50 UTCJul 8, 22:10 UTC3h 20m
2026-07-08 NCR872 - Jul 8, 12:20 UTCJul 8, 13:10 UTC50m
2026-07-08 NCR871 - Jul 8, 01:40 UTCJul 8, 02:15 UTC35m
2026-07-07 NCR870 - Jul 7, 21:25 UTCJul 7, 22:20 UTC55m
2026-07-07 NCR4830 - Jul 7, 15:05 UTCJul 7, 15:25 UTC20m
2026-07-07 NCR4830 - Jul 7, 09:40 UTCJul 7, 13:05 UTC3h 25m
2026-07-07 NCR894 - Jul 7, 00:45 UTCJul 7, 04:00 UTC3h 15m
2026-07-06 NCR894 - Jul 6, 21:50 UTCJul 7, 00:40 UTC2h 50m
2026-07-03 NCR4899 - Jul 3, 09:45 UTCJul 3, 12:50 UTC3h 5m
2026-07-02 NCR4898 TLV → BOM Jul 2, 04:30 UTCJul 2, 12:45 UTC8h 15m
2026-07-01 NCR4897 - Jul 1, 14:20 UTCJul 1, 17:25 UTC3h 5m
2026-06-30 NCR883 TPE → RZE Jun 30, 20:10 UTCJul 1, 09:10 UTC13h 0m

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 N663CA page for operator, model, and routing details .

Mode-S A8BF91 frequently asked

What is Mode-S code A8BF91?
A8BF91 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N663CA.
Where is Mode-S A8BF91 registered?
Mode-S code A8BF91 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 A8BF91 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8BF91, octal 52137621, decimal 11,059,089.
What flights does A8BF91 operate?
Mode-S A8BF91 has broadcast 20 distinct callsigns, including NCR4818, NCR873, NCR846, NCR824, NCR862.