Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A719C9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N557DT · PIPER PA-28-140/150/160/180 · operated by REDACE LLC

Hex
A719C9
Octal
51614711
Decimal
10,951,113
Country
US
Tail
N557DT
Type
P28A
No current signal · last broadcast 4h ago
Flights observed
137
Distinct callsigns
1
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A719C9.

Country allocation

The ICAO 24-bit address A719C9 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
N557DT - 137 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-05 N557DT - Jul 5, 01:00 UTCJul 5, 02:35 UTC1h 35m
2026-07-04 N557DT - Jul 4, 18:10 UTCJul 4, 18:50 UTC40m
2026-07-03 N557DT - Jul 3, 21:00 UTCJul 3, 21:25 UTC25m
2026-07-03 N557DT - Jul 3, 16:45 UTCJul 3, 17:30 UTC45m
2026-07-03 N557DT - Jul 3, 15:50 UTCJul 3, 16:05 UTC15m
2026-07-02 N557DT - Jul 2, 23:30 UTCJul 3, 01:15 UTC1h 45m
2026-07-02 N557DT - Jul 2, 21:20 UTCJul 2, 22:50 UTC1h 30m
2026-07-02 N557DT - Jul 2, 20:35 UTCJul 2, 20:45 UTC10m
2026-07-02 N557DT LZU → LZU Jul 2, 12:55 UTCJul 2, 13:50 UTC55m
2026-07-02 N557DT - Jul 2, 02:05 UTCJul 2, 02:20 UTC15m
2026-07-01 N557DT - Jul 1, 21:30 UTCJul 1, 23:35 UTC2h 5m
2026-07-01 N557DT - Jul 1, 12:20 UTCJul 1, 14:40 UTC2h 20m
2026-07-01 N557DT - Jul 1, 01:40 UTCJul 1, 01:55 UTC15m
2026-06-30 N557DT - Jun 30, 13:35 UTCJun 30, 13:45 UTC10m
2026-06-29 N557DT - Jun 29, 15:19 UTCJun 29, 16:44 UTC1h 25m
2026-06-29 N557DT - Jun 29, 11:50 UTCJun 29, 13:14 UTC1h 25m
2026-06-28 N557DT - Jun 28, 20:50 UTCJun 28, 20:59 UTC10m
2026-06-28 N557DT - Jun 28, 13:00 UTCJun 28, 13:10 UTC10m
2026-06-26 N557DT - Jun 26, 22:40 UTCJun 27, 01:24 UTC2h 45m
2026-06-26 N557DT - Jun 26, 20:55 UTCJun 26, 21:59 UTC1h 5m
2026-06-26 N557DT - Jun 26, 19:20 UTCJun 26, 20:00 UTC40m
2026-06-25 N557DT - Jun 25, 22:49 UTCJun 26, 00:59 UTC2h 10m
2026-06-25 N557DT - Jun 25, 21:15 UTCJun 25, 21:50 UTC35m
2026-06-25 N557DT - Jun 25, 19:24 UTCJun 25, 20:05 UTC40m
2026-06-25 N557DT - Jun 25, 17:20 UTCJun 25, 18:00 UTC40m
2026-06-24 N557DT - Jun 24, 23:54 UTCJun 25, 00:59 UTC1h 5m
2026-06-24 N557DT - Jun 24, 19:55 UTCJun 24, 20:54 UTC1h 0m
2026-06-24 N557DT - Jun 24, 15:49 UTCJun 24, 16:09 UTC20m
2026-06-23 N557DT - Jun 23, 13:59 UTCJun 23, 14:10 UTC10m
2026-06-20 N557DT - Jun 20, 22:25 UTCJun 20, 22:45 UTC20m
2026-06-19 N557DT - Jun 19, 23:59 UTCJun 20, 00:09 UTC10m
2026-06-19 N557DT - Jun 19, 21:24 UTCJun 19, 21:54 UTC30m
2026-06-19 N557DT - Jun 19, 19:45 UTCJun 19, 20:24 UTC40m
2026-06-17 N557DT - Jun 17, 19:00 UTCJun 17, 19:10 UTC10m
2026-06-16 N557DT - Jun 16, 15:20 UTCJun 16, 15:35 UTC15m
2026-06-15 N557DT - Jun 15, 22:00 UTCJun 15, 22:25 UTC25m
2026-06-15 N557DT - Jun 15, 20:34 UTCJun 15, 20:54 UTC20m
2026-06-15 N557DT - Jun 15, 19:50 UTCJun 15, 20:30 UTC40m
2026-06-15 N557DT - Jun 15, 15:25 UTCJun 15, 18:10 UTC2h 45m
2026-06-15 N557DT - Jun 15, 12:45 UTCJun 15, 14:30 UTC1h 45m
2026-06-14 N557DT - Jun 14, 13:30 UTCJun 14, 13:40 UTC10m
2026-06-14 N557DT - Jun 14, 12:15 UTCJun 14, 12:45 UTC30m
2026-06-13 N557DT - Jun 13, 16:20 UTCJun 13, 16:30 UTC10m
2026-06-12 N557DT LZU → LZU Jun 12, 23:55 UTCJun 13, 00:10 UTC15m
2026-06-12 N557DT - Jun 12, 22:30 UTCJun 12, 22:40 UTC10m
2026-06-12 N557DT - Jun 12, 19:55 UTCJun 12, 21:00 UTC1h 5m
2026-06-12 N557DT - Jun 12, 15:45 UTCJun 12, 16:50 UTC1h 5m
2026-06-12 N557DT - Jun 12, 12:55 UTCJun 12, 14:15 UTC1h 20m
2026-06-11 N557DT - Jun 11, 23:30 UTCJun 12, 00:10 UTC40m
2026-06-11 N557DT - Jun 11, 20:50 UTCJun 11, 23:00 UTC2h 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 N557DT page for operator, model, and routing details .

Mode-S A719C9 frequently asked

What is Mode-S code A719C9?
A719C9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N557DT.
Where is Mode-S A719C9 registered?
Mode-S code A719C9 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 A719C9 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A719C9, octal 51614711, decimal 10,951,113.
What flights does A719C9 operate?
Mode-S A719C9 has broadcast 1 distinct callsign, including N557DT.