Apparatus

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sensors Mode-S transponder

A54E71

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N441BD · CESSNA 441 Conquest · operated by N441BD LLC

Hex
A54E71
Octal
51247161
Decimal
10,833,521
Country
US
Tail
N441BD
Type
C441
No current signal · last broadcast Jun 27, 07:45 UTC
Flights observed
79
Distinct callsigns
3
Country
US
Last broadcast
Jun 27, 07:45 UTC

Last known position

Most recent position reported by Mode-S A54E71.

Country allocation

The ICAO 24-bit address A54E71 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 3 distinct

Callsign Airline Flights Last seen
SVX42 - 73 2026-06-27
SVX1891 - 4 2026-04-17
SVX1892 - 2 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-27 SVX42 ANC → ANC Jun 27, 03:04 UTCJun 27, 07:45 UTC4h 40m
2026-06-26 SVX42 - Jun 26, 02:14 UTCJun 26, 04:34 UTC2h 20m
2026-06-26 SVX42 - Jun 26, 01:15 UTCJun 26, 02:09 UTC55m
2026-06-25 SVX42 - Jun 25, 17:20 UTCJun 25, 18:55 UTC1h 35m
2026-06-24 SVX42 - Jun 24, 02:20 UTCJun 24, 03:10 UTC50m
2026-06-23 SVX42 - Jun 23, 23:00 UTCJun 24, 00:25 UTC1h 25m
2026-06-23 SVX42 - Jun 23, 17:30 UTCJun 23, 19:24 UTC1h 55m
2026-06-22 SVX42 FAI → ANC Jun 22, 20:00 UTCJun 23, 00:35 UTC4h 35m
2026-06-22 SVX42 - Jun 22, 18:00 UTCJun 22, 19:09 UTC1h 10m
2026-06-22 SVX42 - Jun 22, 16:50 UTCJun 22, 17:20 UTC30m
2026-06-21 SVX42 - Jun 21, 05:04 UTCJun 21, 06:10 UTC1h 5m
2026-06-20 SVX42 - Jun 20, 02:29 UTCJun 20, 04:04 UTC1h 35m
2026-06-19 SVX42 - Jun 19, 21:39 UTCJun 19, 23:14 UTC1h 35m
2026-06-19 SVX42 - Jun 19, 16:39 UTCJun 19, 18:20 UTC1h 40m
2026-06-18 SVX42 - Jun 18, 20:35 UTCJun 19, 01:15 UTC4h 39m
2026-06-17 SVX42 ANC → ANC Jun 17, 15:25 UTCJun 18, 03:05 UTC11h 40m
2026-06-17 SVX42 - Jun 17, 05:55 UTCJun 17, 06:55 UTC1h 0m
2026-06-17 SVX42 - Jun 17, 01:45 UTCJun 17, 02:45 UTC1h 0m
2026-06-16 SVX42 ANC → ANC Jun 16, 19:40 UTCJun 16, 23:20 UTC3h 41m
2026-06-15 SVX42 - Jun 15, 21:14 UTCJun 16, 01:10 UTC3h 55m
2026-06-14 SVX42 ANC → ANC Jun 14, 16:25 UTCJun 14, 21:15 UTC4h 50m
2026-06-13 SVX42 ANC → ANC Jun 13, 22:25 UTCJun 14, 03:20 UTC4h 55m
2026-06-13 SVX42 - Jun 13, 18:50 UTCJun 13, 20:20 UTC1h 30m
2026-06-13 SVX42 - Jun 13, 17:05 UTCJun 13, 18:15 UTC1h 10m
2026-06-12 SVX42 - Jun 12, 20:05 UTCJun 12, 21:15 UTC1h 10m
2026-06-12 SVX42 - Jun 12, 18:20 UTCJun 12, 19:25 UTC1h 5m
2026-06-09 SVX42 ANC → ANC Jun 9, 22:20 UTCJun 10, 03:30 UTC5h 10m
2026-06-08 SVX42 ANC → ANC Jun 8, 21:05 UTCJun 8, 23:50 UTC2h 45m
2026-06-07 SVX42 - Jun 7, 01:30 UTCJun 7, 02:14 UTC45m
2026-06-06 SVX42 - Jun 6, 16:30 UTCJun 6, 17:19 UTC50m
2026-06-04 SVX42 - Jun 4, 21:25 UTCJun 4, 22:40 UTC1h 15m
2026-06-04 SVX42 - Jun 4, 19:20 UTCJun 4, 20:40 UTC1h 20m
2026-06-03 SVX42 - Jun 3, 23:25 UTCJun 4, 03:00 UTC3h 35m
2026-06-02 SVX42 - Jun 2, 20:30 UTCJun 2, 22:15 UTC1h 45m
2026-06-02 SVX42 - Jun 2, 16:55 UTCJun 2, 18:30 UTC1h 35m
2026-05-26 SVX42 - May 26, 23:05 UTCMay 26, 23:49 UTC45m
2026-05-26 SVX42 - May 26, 21:59 UTCMay 26, 22:29 UTC30m
2026-05-22 SVX42 - May 22, 06:50 UTCMay 22, 08:30 UTC1h 40m
2026-05-20 SVX42 - May 20, 05:30 UTCMay 20, 05:55 UTC25m
2026-05-19 SVX42 - May 19, 19:15 UTCMay 19, 22:35 UTC3h 20m
2026-05-19 SVX42 - May 19, 18:15 UTCMay 19, 18:45 UTC30m
2026-05-18 SVX42 - May 18, 18:45 UTCMay 19, 18:15 UTC23h 30m
2026-05-18 SVX42 - May 18, 16:55 UTCMay 18, 17:50 UTC55m
2026-05-16 SVX42 ANC → ANC May 16, 17:55 UTCMay 16, 21:30 UTC3h 35m
2026-05-16 SVX42 - May 16, 06:06 UTCMay 16, 07:01 UTC55m
2026-05-16 SVX42 - May 16, 05:10 UTCMay 16, 05:20 UTC10m
2026-05-15 SVX42 - May 15, 15:50 UTCMay 15, 16:15 UTC25m
2026-05-15 SVX42 - May 15, 03:40 UTCMay 15, 04:35 UTC55m
2026-05-13 SVX42 ANC → ANC May 13, 22:55 UTCMay 14, 03:20 UTC4h 25m
2026-05-13 SVX42 - May 13, 20:05 UTCMay 13, 21:35 UTC1h 30m

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 N441BD page for operator, model, and routing details .

Mode-S A54E71 frequently asked

What is Mode-S code A54E71?
A54E71 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N441BD.
Where is Mode-S A54E71 registered?
Mode-S code A54E71 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 A54E71 broadcasting right now?
No active broadcast right now. Last signal was Jun 27, 07:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A54E71, octal 51247161, decimal 10,833,521.
What flights does A54E71 operate?
Mode-S A54E71 has broadcast 3 distinct callsigns, including SVX42, SVX1891, SVX1892.