Apparatus

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sensors Mode-S transponder

A4BCAD

ICAO 24-bit transponder address · allocated to United States

Hex
A4BCAD
Octal
51136255
Decimal
10,796,205
Country
US
No current signal · last broadcast 10d ago
Flights observed
78
Distinct callsigns
2
Country
US
Last broadcast
10d ago

Last known position

Most recent position reported by Mode-S A4BCAD.

Country allocation

The ICAO 24-bit address A4BCAD 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 2 distinct

Callsign Airline Flights Last seen
NDU04 - 76 2026-07-23
N404ND - 2 2026-04-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 NDU04 - Jul 23, 17:25 UTCJul 23, 18:35 UTC1h 10m
2026-07-23 NDU04 - Jul 23, 15:40 UTCJul 23, 16:15 UTC35m
2026-07-23 NDU04 - Jul 23, 13:40 UTCJul 23, 14:10 UTC30m
2026-07-23 NDU04 - Jul 23, 03:20 UTCJul 23, 04:15 UTC55m
2026-07-23 NDU04 - Jul 23, 01:20 UTCJul 23, 01:30 UTC10m
2026-07-22 NDU04 - Jul 22, 23:05 UTCJul 22, 23:20 UTC15m
2026-07-22 NDU04 - Jul 22, 19:30 UTCJul 22, 20:20 UTC50m
2026-07-22 NDU04 - Jul 22, 00:25 UTCJul 22, 01:15 UTC50m
2026-07-20 NDU04 - Jul 20, 16:10 UTCJul 20, 16:40 UTC30m
2026-07-20 NDU04 - Jul 20, 12:30 UTCJul 20, 13:40 UTC1h 10m
2026-07-17 NDU04 - Jul 17, 03:30 UTCJul 17, 03:59 UTC30m
2026-07-16 NDU04 - Jul 16, 23:44 UTCJul 17, 00:14 UTC30m
2026-07-16 NDU04 - Jul 16, 21:30 UTCJul 16, 22:19 UTC50m
2026-07-15 NDU04 - Jul 15, 20:20 UTCJul 15, 21:20 UTC1h 0m
2026-07-15 NDU04 GFK → GFK Jul 15, 14:20 UTCJul 15, 15:25 UTC1h 5m
2026-07-15 NDU04 - Jul 15, 03:35 UTCJul 15, 04:45 UTC1h 10m
2026-07-14 NDU04 - Jul 14, 20:25 UTCJul 14, 20:55 UTC30m
2026-07-14 NDU04 - Jul 14, 18:55 UTCJul 14, 19:05 UTC10m
2026-07-14 NDU04 - Jul 14, 16:30 UTCJul 14, 17:00 UTC30m
2026-07-14 NDU04 - Jul 14, 13:55 UTCJul 14, 14:25 UTC30m
2026-07-11 NDU04 - Jul 11, 20:45 UTCJul 11, 21:25 UTC40m
2026-07-11 NDU04 - Jul 11, 18:00 UTCJul 11, 19:05 UTC1h 5m
2026-07-11 NDU04 - Jul 11, 16:00 UTCJul 11, 16:10 UTC10m
2026-07-11 NDU04 - Jul 11, 14:05 UTCJul 11, 14:30 UTC25m
2026-07-11 NDU04 - Jul 11, 02:50 UTCJul 11, 03:50 UTC1h 0m
2026-07-10 NDU04 - Jul 10, 17:05 UTCJul 10, 17:15 UTC10m
2026-07-10 NDU04 - Jul 10, 13:25 UTCJul 10, 13:50 UTC25m
2026-07-09 NDU04 - Jul 9, 23:05 UTCJul 9, 23:25 UTC20m
2026-07-09 NDU04 - Jul 9, 19:50 UTCJul 9, 20:25 UTC35m
2026-07-09 NDU04 - Jul 9, 13:30 UTCJul 9, 14:10 UTC40m
2026-07-08 NDU04 - Jul 8, 18:50 UTCJul 8, 19:50 UTC1h 0m
2026-07-06 NDU04 - Jul 6, 14:35 UTCJul 6, 15:35 UTC1h 0m
2026-07-02 NDU04 - Jul 2, 15:10 UTCJul 2, 15:25 UTC15m
2026-07-01 NDU04 - Jul 1, 20:45 UTCJul 1, 21:15 UTC30m
2026-07-01 NDU04 - Jul 1, 15:20 UTCJul 1, 15:40 UTC20m
2026-07-01 NDU04 - Jul 1, 13:05 UTCJul 1, 13:40 UTC35m
2026-06-26 NDU04 - Jun 26, 23:55 UTCJun 27, 00:14 UTC20m
2026-06-26 NDU04 - Jun 26, 19:55 UTCJun 26, 20:44 UTC50m
2026-06-26 NDU04 - Jun 26, 17:35 UTCJun 26, 18:24 UTC50m
2026-06-26 NDU04 - Jun 26, 13:45 UTCJun 26, 14:39 UTC55m
2026-06-25 NDU04 - Jun 25, 22:14 UTCJun 25, 22:49 UTC35m
2026-06-23 NDU04 - Jun 23, 01:10 UTCJun 23, 01:20 UTC10m
2026-06-22 NDU04 - Jun 22, 16:20 UTCJun 22, 17:10 UTC50m
2026-06-20 NDU04 - Jun 20, 15:49 UTCJun 20, 17:59 UTC2h 10m
2026-06-20 NDU04 - Jun 20, 01:55 UTCJun 20, 04:09 UTC2h 15m
2026-06-19 NDU04 - Jun 19, 03:24 UTCJun 19, 03:49 UTC25m
2026-06-18 NDU04 - Jun 18, 17:55 UTCJun 18, 18:20 UTC25m
2026-06-18 NDU04 - Jun 18, 15:30 UTCJun 18, 16:25 UTC55m
2026-06-18 NDU04 - Jun 18, 13:05 UTCJun 18, 14:05 UTC1h 0m
2026-06-16 NDU04 - Jun 16, 18:39 UTCJun 16, 19:00 UTC20m

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.

Mode-S A4BCAD frequently asked

What is Mode-S code A4BCAD?
A4BCAD is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S A4BCAD registered?
Mode-S code A4BCAD 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 A4BCAD broadcasting right now?
No active broadcast right now. Last signal was 10d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4BCAD, octal 51136255, decimal 10,796,205.
What flights does A4BCAD operate?
Mode-S A4BCAD has broadcast 2 distinct callsigns, including NDU04, N404ND.