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
Broadcasting now · callsign NCR569 · 9,975 ft
Flights observed
135
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Current position

A8BF91 is currently broadcasting. Map zoomed to live position.

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 - 5 2026-05-20
NCR862 - 4 2026-06-10
NCR825 - 4 2026-06-25
NCR824 - 4 2026-05-10
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
NCR601 National Air Cargo 3 2026-06-15
NCR4821 - 3 2026-06-14
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
NCR853 - 2 2026-06-20
NCR844 - 2 2026-06-27
NCR810 National Air Cargo 2 2026-06-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 NCR569 - Jul 14, 11:10 UTCJul 14, 12:15 UTC1h 5m
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
2026-06-29 NCR882 ICN → TPE Jun 29, 14:54 UTCJun 29, 16:59 UTC2h 5m
2026-06-27 NCR844 - Jun 27, 10:14 UTCJun 27, 11:00 UTC45m
2026-06-27 NCR844 - Jun 27, 04:29 UTCJun 27, 04:44 UTC15m
2026-06-25 NCR825 - Jun 25, 18:00 UTCJun 26, 02:40 UTC8h 40m
2026-06-25 NCR825 - Jun 25, 07:54 UTCJun 25, 14:55 UTC7h 0m
2026-06-24 NCR825 - Jun 24, 06:39 UTCJun 24, 17:29 UTC10h 50m
2026-06-23 NCR852 - Jun 23, 19:15 UTCJun 24, 02:24 UTC7h 10m
2026-06-23 NCR852 - Jun 23, 08:50 UTCJun 23, 15:55 UTC7h 5m
2026-06-22 NCR652 - Jun 22, 22:59 UTCJun 23, 06:34 UTC7h 35m
2026-06-22 NCR652 - Jun 22, 10:34 UTCJun 23, 06:34 UTC20h 0m
2026-06-22 NCR619 - Jun 22, 02:30 UTCJun 23, 00:24 UTC21h 55m
2026-06-21 NCR869 - Jun 21, 17:15 UTCJun 22, 12:05 UTC18h 50m
2026-06-21 NCR869 - Jun 21, 05:10 UTCJun 21, 12:49 UTC7h 40m
2026-06-20 NCR853 - Jun 20, 19:34 UTCJun 20, 22:54 UTC3h 20m
2026-06-20 NCR852 - Jun 20, 05:09 UTCJun 20, 16:05 UTC10h 55m
2026-06-19 NCR851 - Jun 19, 16:29 UTCJun 19, 23:09 UTC6h 40m
2026-06-18 NCR4891 - Jun 18, 21:30 UTCJun 19, 04:54 UTC7h 24m
2026-06-18 NCR4891 - Jun 18, 09:05 UTCJun 18, 15:35 UTC6h 30m
2026-06-17 NCR808 - Jun 17, 23:35 UTCJun 17, 23:50 UTC15m
2026-06-17 NCR808 - Jun 17, 16:45 UTCJun 17, 16:55 UTC10m
2026-06-17 NCR808 - Jun 17, 06:20 UTCJun 17, 13:40 UTC7h 20m
2026-06-16 NCR807 - Jun 16, 18:20 UTCJun 17, 02:35 UTC8h 16m
2026-06-16 NCR853 - Jun 16, 07:09 UTCJun 16, 13:00 UTC5h 50m
2026-06-15 NCR652D - Jun 15, 10:15 UTCJun 16, 04:05 UTC17h 50m
2026-06-15 NCR652D - Jun 15, 04:20 UTCJun 16, 04:05 UTC23h 45m

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?
Yes. Mode-S A8BF91 is currently airborne.
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, NCR862, NCR825, NCR824.