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sensors Mode-S transponder

AC40D8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N889SD · operated by MEDARY AVIATION LLC

Hex
AC40D8
Octal
53040330
Decimal
11,288,792
Country
US
Tail
N889SD
Type
C172
No current signal · last broadcast Jul 22, 18:30 UTC
Flights observed
302
Distinct callsigns
1
Country
US
Last broadcast
Jul 22, 18:30 UTC

Last known position

Most recent position reported by Mode-S AC40D8.

Country allocation

The ICAO 24-bit address AC40D8 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
N889SD - 302 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 N889SD - Jul 22, 17:25 UTCJul 22, 18:30 UTC1h 5m
2026-07-22 N889SD BKX → BKX Jul 22, 12:25 UTCJul 22, 13:35 UTC1h 10m
2026-07-21 N889SD BKX → BKX Jul 21, 22:55 UTCJul 21, 23:55 UTC1h 0m
2026-07-21 N889SD BKX → BKX Jul 21, 20:45 UTCJul 21, 21:40 UTC55m
2026-07-21 N889SD BKX → BKX Jul 21, 15:45 UTCJul 21, 16:25 UTC40m
2026-07-20 N889SD BKX → BKX Jul 20, 21:35 UTCJul 20, 22:35 UTC1h 0m
2026-07-20 N889SD BKX → BKX Jul 20, 18:55 UTCJul 20, 19:15 UTC20m
2026-07-20 N889SD BKX → BKX Jul 20, 17:40 UTCJul 20, 18:45 UTC1h 5m
2026-07-19 N889SD BKX → BKX Jul 19, 21:35 UTCJul 19, 22:25 UTC50m
2026-07-19 N889SD - Jul 19, 18:30 UTCJul 19, 19:25 UTC55m
2026-07-19 N889SD - Jul 19, 17:05 UTCJul 19, 18:00 UTC55m
2026-07-19 N889SD BKX → STP Jul 19, 14:30 UTCJul 19, 16:05 UTC1h 35m
2026-07-18 N889SD - Jul 18, 17:35 UTCJul 18, 17:40 UTC5m
2026-07-18 N889SD - Jul 18, 16:35 UTCJul 18, 16:45 UTC10m
2026-07-18 N889SD - Jul 18, 15:05 UTCJul 18, 15:30 UTC25m
2026-07-18 N889SD BKX → BKX Jul 18, 03:10 UTCJul 18, 03:45 UTC35m
2026-07-17 N889SD - Jul 17, 20:10 UTCJul 17, 20:40 UTC30m
2026-07-17 N889SD BKX → BKX Jul 17, 19:30 UTCJul 17, 20:04 UTC35m
2026-07-17 N889SD - Jul 17, 16:49 UTCJul 17, 16:55 UTC5m
2026-07-17 N889SD BKX → BKX Jul 17, 15:35 UTCJul 17, 16:44 UTC1h 10m
2026-07-16 N889SD - Jul 16, 17:05 UTCJul 16, 17:20 UTC15m
2026-07-16 N889SD - Jul 16, 16:00 UTCJul 16, 16:09 UTC10m
2026-07-16 N889SD BKX → BKX Jul 16, 14:25 UTCJul 16, 15:00 UTC35m
2026-07-16 N889SD BKX → BKX Jul 16, 12:34 UTCJul 16, 13:34 UTC1h 0m
2026-07-15 N889SD BKX → BKX Jul 15, 19:20 UTCJul 15, 20:05 UTC45m
2026-07-15 N889SD BKX → BKX Jul 15, 15:25 UTCJul 15, 16:45 UTC1h 20m
2026-07-15 N889SD BKX → BKX Jul 15, 13:00 UTCJul 15, 14:25 UTC1h 25m
2026-07-15 N889SD BKX → BKX Jul 15, 00:25 UTCJul 15, 01:35 UTC1h 10m
2026-07-14 N889SD BKX → BKX Jul 14, 20:20 UTCJul 14, 21:20 UTC1h 0m
2026-07-14 N889SD BKX → BKX Jul 14, 18:25 UTCJul 14, 19:25 UTC1h 0m
2026-07-14 N889SD BKX → BKX Jul 14, 15:55 UTCJul 14, 16:30 UTC35m
2026-07-14 N889SD BKX → BKX Jul 14, 14:15 UTCJul 14, 14:20 UTC5m
2026-07-14 N889SD - Jul 14, 12:35 UTCJul 14, 13:10 UTC35m
2026-07-13 N889SD BKX → BKX Jul 13, 23:55 UTCJul 14, 01:25 UTC1h 30m
2026-07-13 N889SD BKX → BKX Jul 13, 19:35 UTCJul 13, 20:50 UTC1h 15m
2026-07-13 N889SD BKX → BKX Jul 13, 15:35 UTCJul 13, 17:00 UTC1h 25m
2026-07-12 N889SD - Jul 12, 21:55 UTCJul 12, 22:20 UTC25m
2026-07-12 N889SD BKX → FSD Jul 12, 20:45 UTCJul 12, 21:20 UTC35m
2026-07-10 N889SD BKX → BKX Jul 10, 23:35 UTCJul 11, 00:30 UTC55m
2026-07-10 N889SD BKX → BKX Jul 10, 19:45 UTCJul 10, 21:00 UTC1h 15m
2026-07-10 N889SD BKX → BKX Jul 10, 16:15 UTCJul 10, 17:05 UTC50m
2026-07-10 N889SD BKX → BKX Jul 10, 14:15 UTCJul 10, 15:20 UTC1h 5m
2026-07-07 N889SD BKX → BKX Jul 7, 20:00 UTCJul 7, 20:40 UTC40m
2026-07-07 N889SD BKX → BKX Jul 7, 14:00 UTCJul 7, 14:50 UTC50m
2026-07-06 N889SD - Jul 6, 21:15 UTCJul 6, 21:25 UTC10m
2026-07-06 N889SD - Jul 6, 20:15 UTCJul 6, 20:30 UTC15m
2026-07-06 N889SD BKX → BKX Jul 6, 18:30 UTCJul 6, 19:35 UTC1h 5m
2026-07-03 N889SD BKX → BKX Jul 3, 18:55 UTCJul 3, 20:00 UTC1h 5m
2026-07-02 N889SD BKX → BKX Jul 2, 14:55 UTCJul 2, 15:50 UTC55m
2026-07-02 N889SD BKX → BKX Jul 2, 12:45 UTCJul 2, 13:50 UTC1h 5m

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 N889SD page for operator, model, and routing details .

Mode-S AC40D8 frequently asked

What is Mode-S code AC40D8?
AC40D8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N889SD.
Where is Mode-S AC40D8 registered?
Mode-S code AC40D8 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 AC40D8 broadcasting right now?
No active broadcast right now. Last signal was Jul 22, 18:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC40D8, octal 53040330, decimal 11,288,792.
What flights does AC40D8 operate?
Mode-S AC40D8 has broadcast 1 distinct callsign, including N889SD.