Apparatus

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sensors Mode-S transponder

A4DD4D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N412TX · BELL 412 · operated by BERNAILILLO COUNTY SHERIFFS OFFICE

Hex
A4DD4D
Octal
51156515
Decimal
10,804,557
Country
US
Tail
N412TX
Type
B412
No current signal · last broadcast Jul 24, 18:10 UTC
Flights observed
66
Distinct callsigns
2
Country
US
Last broadcast
Jul 24, 18:10 UTC

Last known position

Most recent position reported by Mode-S A4DD4D.

Country allocation

The ICAO 24-bit address A4DD4D 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
METRO4 - 52 2026-07-24
N412TX - 14 2026-05-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 METRO4 - Jul 24, 17:00 UTCJul 24, 18:10 UTC1h 10m
2026-07-22 METRO4 - Jul 22, 20:55 UTCJul 22, 21:45 UTC50m
2026-07-22 METRO4 - Jul 22, 17:15 UTCJul 22, 17:35 UTC20m
2026-07-21 METRO4 - Jul 21, 17:35 UTCJul 21, 19:45 UTC2h 10m
2026-07-20 METRO4 - Jul 20, 18:05 UTCJul 20, 18:30 UTC25m
2026-07-20 METRO4 - Jul 20, 16:55 UTCJul 20, 17:05 UTC10m
2026-07-15 METRO4 - Jul 15, 16:55 UTCJul 15, 17:10 UTC15m
2026-07-15 METRO4 - Jul 15, 15:40 UTCJul 15, 16:00 UTC20m
2026-07-15 METRO4 - Jul 15, 12:50 UTCJul 15, 13:20 UTC30m
2026-07-08 METRO4 - Jul 8, 17:40 UTCJul 8, 18:55 UTC1h 15m
2026-07-08 METRO4 - Jul 8, 16:10 UTCJul 8, 16:25 UTC15m
2026-07-08 METRO4 - Jul 8, 12:30 UTCJul 8, 12:40 UTC10m
2026-07-07 METRO4 - Jul 7, 18:50 UTCJul 7, 20:10 UTC1h 20m
2026-07-07 METRO4 - Jul 7, 18:00 UTCJul 7, 18:10 UTC10m
2026-07-07 METRO4 - Jul 7, 17:10 UTCJul 7, 17:20 UTC10m
2026-07-02 METRO4 - Jul 2, 17:20 UTCJul 2, 17:30 UTC10m
2026-07-02 METRO4 - Jul 2, 14:45 UTCJul 2, 14:55 UTC10m
2026-07-01 METRO4 - Jul 1, 17:20 UTCJul 1, 17:35 UTC15m
2026-07-01 METRO4 - Jul 1, 15:35 UTCJul 1, 16:15 UTC40m
2026-07-01 METRO4 - Jul 1, 12:40 UTCJul 1, 13:15 UTC35m
2026-06-26 METRO4 - Jun 26, 18:24 UTCJun 26, 18:49 UTC25m
2026-06-26 METRO4 - Jun 26, 15:05 UTCJun 26, 15:15 UTC10m
2026-06-24 METRO4 - Jun 24, 21:34 UTCJun 24, 21:44 UTC10m
2026-06-24 METRO4 - Jun 24, 21:14 UTCJun 24, 21:29 UTC15m
2026-06-24 METRO4 - Jun 24, 20:49 UTCJun 24, 21:09 UTC20m
2026-06-24 METRO4 - Jun 24, 20:24 UTCJun 24, 20:44 UTC20m
2026-06-24 METRO4 - Jun 24, 20:09 UTCJun 24, 20:20 UTC10m
2026-06-24 METRO4 - Jun 24, 19:39 UTCJun 24, 20:05 UTC25m
2026-06-24 METRO4 - Jun 24, 19:24 UTCJun 24, 19:34 UTC10m
2026-06-23 METRO4 - Jun 23, 17:50 UTCJun 23, 19:00 UTC1h 10m
2026-06-19 METRO4 - Jun 19, 01:54 UTCJun 19, 03:24 UTC1h 30m
2026-06-18 METRO4 - Jun 18, 15:55 UTCJun 18, 16:20 UTC25m
2026-06-17 METRO4 - Jun 17, 19:05 UTCJun 17, 21:30 UTC2h 25m
2026-06-16 METRO4 - Jun 16, 16:15 UTCJun 16, 17:05 UTC50m
2026-06-12 METRO4 - Jun 12, 03:25 UTCJun 12, 04:50 UTC1h 25m
2026-06-12 METRO4 - Jun 12, 01:30 UTCJun 12, 02:15 UTC45m
2026-06-11 METRO4 - Jun 11, 04:05 UTCJun 11, 05:15 UTC1h 10m
2026-06-10 METRO4 - Jun 10, 18:50 UTCJun 10, 20:40 UTC1h 50m
2026-06-08 METRO4 - Jun 8, 18:05 UTCJun 8, 18:15 UTC10m
2026-06-08 METRO4 - Jun 8, 17:05 UTCJun 8, 17:15 UTC10m
2026-06-03 METRO4 - Jun 3, 19:40 UTCJun 3, 20:40 UTC1h 0m
2026-05-14 METRO4 - May 14, 23:25 UTCMay 14, 23:40 UTC15m
2026-05-14 METRO4 - May 14, 15:45 UTCMay 14, 15:55 UTC10m
2026-05-13 METRO4 - May 13, 21:55 UTCMay 13, 22:10 UTC15m
2026-05-13 METRO4 - May 13, 16:20 UTCMay 13, 16:30 UTC10m
2026-05-12 METRO4 - May 12, 22:31 UTCMay 12, 23:15 UTC45m
2026-05-12 METRO4 - May 12, 20:50 UTCMay 12, 21:25 UTC35m
2026-05-12 METRO4 - May 12, 18:25 UTCMay 12, 18:45 UTC20m
2026-05-12 METRO4 - May 12, 16:50 UTCMay 12, 17:30 UTC40m
2026-05-11 METRO4 - May 11, 21:30 UTCMay 11, 22:15 UTC45m

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 N412TX page for operator, model, and routing details .

Mode-S A4DD4D frequently asked

What is Mode-S code A4DD4D?
A4DD4D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N412TX.
Where is Mode-S A4DD4D registered?
Mode-S code A4DD4D 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 A4DD4D broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 18:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4DD4D, octal 51156515, decimal 10,804,557.
What flights does A4DD4D operate?
Mode-S A4DD4D has broadcast 2 distinct callsigns, including METRO4, N412TX.