Apparatus

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sensors Mode-S transponder

A538D7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N43556 · PIPER PA-28-140/150/160/180 · operated by WADDELL CHARLES T, WADDELL MARGARET E

Hex
A538D7
Octal
51234327
Decimal
10,827,991
Country
US
Tail
N43556
Type
P28A
Broadcasting now · callsign N43556 · 4,525 ft
Flights observed
51
Distinct callsigns
1
Country
US
Last broadcast
22h ago

Current position

A538D7 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A538D7 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
N43556 - 51 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-19 N43556 - Jul 19, 17:00 UTCJul 19, 18:10 UTC1h 10m
2026-07-18 N43556 - Jul 18, 17:15 UTCJul 18, 18:10 UTC55m
2026-07-18 N43556 - Jul 18, 15:35 UTCJul 18, 16:30 UTC55m
2026-07-17 N43556 - Jul 17, 15:44 UTCJul 17, 18:00 UTC2h 15m
2026-07-16 N43556 - Jul 16, 20:25 UTCJul 16, 21:35 UTC1h 10m
2026-07-16 N43556 - Jul 16, 17:40 UTCJul 16, 17:49 UTC10m
2026-07-16 N43556 - Jul 16, 15:49 UTCJul 16, 17:30 UTC1h 40m
2026-07-14 N43556 - Jul 14, 16:00 UTCJul 14, 17:20 UTC1h 20m
2026-07-12 N43556 - Jul 12, 18:20 UTCJul 12, 19:10 UTC50m
2026-07-08 N43556 - Jul 8, 21:55 UTCJul 8, 22:40 UTC45m
2026-07-04 N43556 - Jul 4, 16:45 UTCJul 4, 17:55 UTC1h 10m
2026-07-03 N43556 - Jul 3, 16:10 UTCJul 3, 16:55 UTC45m
2026-06-30 N43556 - Jun 30, 15:40 UTCJun 30, 17:10 UTC1h 30m
2026-06-29 N43556 - Jun 29, 17:14 UTCJun 29, 18:49 UTC1h 35m
2026-06-29 N43556 - Jun 29, 01:25 UTCJun 29, 02:30 UTC1h 5m
2026-06-28 N43556 - Jun 28, 23:34 UTCJun 29, 00:29 UTC55m
2026-06-27 N43556 - Jun 27, 19:39 UTCJun 27, 20:59 UTC1h 20m
2026-06-26 N43556 - Jun 26, 17:09 UTCJun 26, 18:49 UTC1h 40m
2026-06-25 N43556 - Jun 25, 17:44 UTCJun 25, 18:04 UTC20m
2026-06-25 N43556 - Jun 25, 16:39 UTCJun 25, 17:14 UTC35m
2026-06-23 N43556 - Jun 23, 17:09 UTCJun 23, 18:29 UTC1h 20m
2026-06-22 N43556 - Jun 22, 17:44 UTCJun 22, 18:49 UTC1h 5m
2026-06-22 N43556 - Jun 22, 15:10 UTCJun 22, 16:29 UTC1h 20m
2026-06-21 N43556 - Jun 21, 21:29 UTCJun 21, 22:15 UTC45m
2026-06-21 N43556 - Jun 21, 20:09 UTCJun 21, 20:54 UTC45m
2026-06-21 N43556 - Jun 21, 17:29 UTCJun 21, 18:44 UTC1h 15m
2026-06-19 N43556 - Jun 19, 16:49 UTCJun 19, 18:14 UTC1h 25m
2026-06-18 N43556 - Jun 18, 18:25 UTCJun 18, 19:35 UTC1h 10m
2026-06-15 N43556 - Jun 15, 14:30 UTCJun 15, 15:00 UTC30m
2026-06-13 N43556 - Jun 13, 16:05 UTCJun 13, 18:30 UTC2h 25m
2026-06-12 N43556 - Jun 12, 16:25 UTCJun 12, 17:45 UTC1h 20m
2026-06-11 N43556 - Jun 11, 15:40 UTCJun 11, 16:45 UTC1h 5m
2026-06-10 N43556 - Jun 10, 15:40 UTCJun 10, 17:25 UTC1h 45m
2026-06-09 N43556 - Jun 9, 21:30 UTCJun 9, 22:50 UTC1h 20m
2026-06-08 N43556 - Jun 8, 19:35 UTCJun 8, 20:45 UTC1h 10m
2026-06-08 N43556 - Jun 8, 15:45 UTCJun 8, 17:20 UTC1h 35m
2026-06-07 N43556 - Jun 7, 15:35 UTCJun 7, 16:40 UTC1h 5m
2026-06-06 N43556 - Jun 6, 18:55 UTCJun 6, 20:05 UTC1h 10m
2026-06-05 N43556 - Jun 5, 20:05 UTCJun 5, 21:10 UTC1h 5m
2026-06-04 N43556 - Jun 4, 19:55 UTCJun 4, 20:50 UTC55m
2026-06-04 N43556 - Jun 4, 16:10 UTCJun 4, 17:25 UTC1h 15m
2026-06-03 N43556 - Jun 3, 19:30 UTCJun 3, 20:15 UTC45m
2026-06-03 N43556 - Jun 3, 15:50 UTCJun 3, 17:05 UTC1h 15m
2026-06-01 N43556 - Jun 1, 19:15 UTCJun 1, 20:10 UTC55m
2026-06-01 N43556 - Jun 1, 16:00 UTCJun 1, 16:55 UTC55m
2026-05-31 N43556 - May 31, 17:05 UTCMay 31, 18:00 UTC55m
2026-05-29 N43556 - May 29, 19:10 UTCMay 29, 19:55 UTC45m
2026-05-29 N43556 - May 29, 16:15 UTCMay 29, 17:05 UTC50m
2026-05-27 N43556 - May 27, 17:35 UTCMay 27, 18:15 UTC40m
2026-05-26 N43556 - May 26, 22:54 UTCMay 27, 00:04 UTC1h 10m

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 N43556 page for operator, model, and routing details .

Mode-S A538D7 frequently asked

What is Mode-S code A538D7?
A538D7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N43556.
Where is Mode-S A538D7 registered?
Mode-S code A538D7 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 A538D7 broadcasting right now?
Yes. Mode-S A538D7 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A538D7, octal 51234327, decimal 10,827,991.
What flights does A538D7 operate?
Mode-S A538D7 has broadcast 1 distinct callsign, including N43556.