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sensors Mode-S transponder

A5D891

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N476NA · BRITISH AEROSPACE 146-100 Statesman · operated by NEPTUNE AVIATION SERVICES INC

Hex
A5D891
Octal
51354221
Decimal
10,868,881
Country
US
Tail
N476NA
Type
B461
No current signal · last broadcast Jul 25, 16:50 UTC
Flights observed
130
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 16:50 UTC

Last known position

Most recent position reported by Mode-S A5D891.

Country allocation

The ICAO 24-bit address A5D891 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 1 distinct

Callsign Airline Flights Last seen
TKR12 - 130 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 TKR12 - Jul 25, 16:40 UTCJul 25, 16:50 UTC10m
2026-07-25 TKR12 - Jul 25, 02:30 UTCJul 25, 02:40 UTC10m
2026-07-25 TKR12 - Jul 25, 01:10 UTCJul 25, 01:25 UTC15m
2026-07-23 TKR12 - Jul 23, 17:00 UTCJul 23, 17:10 UTC10m
2026-07-22 TKR12 - Jul 22, 03:55 UTCJul 22, 04:10 UTC15m
2026-07-22 TKR12 - Jul 22, 03:05 UTCJul 22, 03:20 UTC15m
2026-07-21 TKR12 - Jul 21, 17:15 UTCJul 21, 17:25 UTC10m
2026-07-20 TKR12 - Jul 20, 20:50 UTCJul 20, 21:15 UTC25m
2026-07-20 TKR12 - Jul 20, 03:10 UTCJul 20, 03:35 UTC25m
2026-07-20 TKR12 - Jul 20, 02:15 UTCJul 20, 03:05 UTC50m
2026-07-19 TKR12 - Jul 19, 20:45 UTCJul 19, 21:00 UTC15m
2026-07-19 TKR12 - Jul 19, 02:45 UTCJul 19, 03:05 UTC20m
2026-07-19 TKR12 - Jul 19, 00:50 UTCJul 19, 01:10 UTC20m
2026-07-18 TKR12 - Jul 18, 23:50 UTCJul 19, 00:15 UTC25m
2026-07-18 TKR12 - Jul 18, 22:40 UTCJul 18, 23:10 UTC30m
2026-07-16 TKR12 - Jul 16, 22:30 UTCJul 16, 23:20 UTC50m
2026-07-16 TKR12 - Jul 16, 21:30 UTCJul 16, 22:05 UTC35m
2026-07-16 TKR12 - Jul 16, 20:25 UTCJul 16, 21:25 UTC1h 0m
2026-07-16 TKR12 - Jul 16, 18:55 UTCJul 16, 20:19 UTC1h 25m
2026-07-14 TKR12 - Jul 14, 03:15 UTCJul 14, 03:40 UTC25m
2026-07-14 TKR12 - Jul 14, 02:05 UTCJul 14, 02:40 UTC35m
2026-07-14 TKR12 - Jul 14, 00:50 UTCJul 14, 02:00 UTC1h 10m
2026-07-13 TKR12 - Jul 13, 22:50 UTCJul 13, 23:30 UTC40m
2026-07-13 TKR12 - Jul 13, 19:05 UTCJul 13, 20:50 UTC1h 45m
2026-07-13 TKR12 - Jul 13, 17:50 UTCJul 13, 18:35 UTC45m
2026-07-12 TKR12 - Jul 12, 23:00 UTCJul 12, 23:30 UTC30m
2026-07-12 TKR12 - Jul 12, 20:40 UTCJul 12, 21:30 UTC50m
2026-07-12 TKR12 - Jul 12, 19:35 UTCJul 12, 20:10 UTC35m
2026-07-12 TKR12 - Jul 12, 00:25 UTCJul 12, 02:25 UTC2h 0m
2026-07-11 TKR12 - Jul 11, 23:05 UTCJul 11, 23:55 UTC50m
2026-07-11 TKR12 - Jul 11, 17:00 UTCJul 11, 17:10 UTC10m
2026-07-11 TKR12 - Jul 11, 00:00 UTCJul 11, 00:30 UTC30m
2026-07-09 TKR12 - Jul 9, 22:15 UTCJul 9, 22:55 UTC40m
2026-07-09 TKR12 - Jul 9, 20:50 UTCJul 9, 21:25 UTC35m
2026-07-09 TKR12 - Jul 9, 19:50 UTCJul 9, 20:00 UTC10m
2026-07-08 TKR12 - Jul 8, 02:25 UTCJul 8, 03:35 UTC1h 10m
2026-07-08 TKR12 - Jul 8, 01:15 UTCJul 8, 01:25 UTC10m
2026-07-07 TKR12 - Jul 7, 23:10 UTCJul 7, 23:20 UTC10m
2026-07-06 TKR12 - Jul 6, 02:20 UTCJul 6, 02:55 UTC35m
2026-07-06 TKR12 - Jul 6, 01:05 UTCJul 6, 01:40 UTC35m
2026-07-05 TKR12 - Jul 5, 23:45 UTCJul 6, 00:30 UTC45m
2026-07-04 TKR12 - Jul 4, 21:10 UTCJul 4, 22:00 UTC50m
2026-07-04 TKR12 - Jul 4, 01:50 UTCJul 4, 02:30 UTC40m
2026-07-03 TKR12 - Jul 3, 21:15 UTCJul 3, 21:40 UTC25m
2026-06-30 TKR12 - Jun 30, 02:35 UTCJun 30, 03:05 UTC30m
2026-06-30 TKR12 - Jun 30, 01:30 UTCJun 30, 01:50 UTC20m
2026-06-30 TKR12 - Jun 30, 00:25 UTCJun 30, 00:49 UTC25m
2026-06-29 TKR12 - Jun 29, 23:19 UTCJun 29, 23:44 UTC25m
2026-06-29 TKR12 - Jun 29, 22:15 UTCJun 29, 22:39 UTC25m
2026-06-29 TKR12 - Jun 29, 20:00 UTCJun 29, 20:49 UTC50m

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 N476NA page for operator, model, and routing details .

Mode-S A5D891 frequently asked

What is Mode-S code A5D891?
A5D891 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N476NA.
Where is Mode-S A5D891 registered?
Mode-S code A5D891 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 A5D891 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 16:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5D891, octal 51354221, decimal 10,868,881.
What flights does A5D891 operate?
Mode-S A5D891 has broadcast 1 distinct callsign, including TKR12.