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sensors Mode-S transponder

AC1CDE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N88QD · PILATUS PC-12 · operated by QUEST DIAGNOSTICS CLINICAL LABORATORIES INC

Hex
AC1CDE
Octal
53016336
Decimal
11,279,582
Country
US
Tail
N88QD
Type
PC12
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
274
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S AC1CDE.

Country allocation

The ICAO 24-bit address AC1CDE 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 20 distinct

Callsign Airline Flights Last seen
LBQ640 - 48 2026-07-18
LBQ791 - 34 2026-07-02
LBQ840 - 23 2026-05-22
LBQ825 - 23 2026-06-27
LBQ870 - 19 2026-04-16
LBQ783 - 17 2026-06-06
LBQ650 - 17 2026-07-25
LBQ651 - 11 2026-07-25
LBQ792 - 9 2026-06-13
LBQ612 - 8 2026-07-21
LBQ611 - 8 2026-07-22
LBQ420 - 8 2026-05-09
LBQ425 - 7 2026-05-09
LBQ968 - 6 2026-07-26
LBQ900 - 6 2026-06-19
LBQ800 - 5 2026-06-05
LBQ790 - 5 2026-06-16
LBQ670 - 4 2026-06-11
LBQ901 - 3 2026-06-15
LBQ421 - 3 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 LBQ968 - Jul 26, 20:50 UTCJul 26, 21:30 UTC40m
2026-07-26 LBQ968 - Jul 26, 01:15 UTCJul 26, 03:40 UTC2h 25m
2026-07-25 LBQ968 - Jul 25, 20:55 UTCJul 26, 00:35 UTC3h 40m
2026-07-25 LBQ651 - Jul 25, 12:30 UTCJul 25, 15:40 UTC3h 10m
2026-07-25 LBQ651 - Jul 25, 10:20 UTCJul 25, 12:15 UTC1h 55m
2026-07-25 LBQ650 DPA → JCI Jul 25, 08:05 UTCJul 25, 09:40 UTC1h 35m
2026-07-25 LBQ650 - Jul 25, 05:55 UTCJul 25, 07:00 UTC1h 5m
2026-07-25 LBQ650 RDG → LUK Jul 25, 03:05 UTCJul 25, 04:55 UTC1h 50m
2026-07-24 LBQ651 - Jul 24, 12:40 UTCJul 24, 15:50 UTC3h 10m
2026-07-24 LBQ651 - Jul 24, 10:25 UTCJul 24, 12:20 UTC1h 55m
2026-07-24 LBQ650 - Jul 24, 08:00 UTCJul 24, 09:30 UTC1h 30m
2026-07-24 LBQ650 - Jul 24, 05:55 UTCJul 24, 07:05 UTC1h 10m
2026-07-24 LBQ650 - Jul 24, 03:20 UTCJul 24, 05:05 UTC1h 45m
2026-07-22 LBQ651 - Jul 22, 12:40 UTCJul 22, 15:40 UTC3h 0m
2026-07-22 LBQ651 - Jul 22, 11:10 UTCJul 22, 12:15 UTC1h 5m
2026-07-22 LBQ611 - Jul 22, 01:05 UTCJul 22, 04:35 UTC3h 30m
2026-07-21 LBQ612 - Jul 21, 10:30 UTCJul 21, 13:50 UTC3h 20m
2026-07-21 LBQ612 - Jul 21, 07:15 UTCJul 21, 08:55 UTC1h 40m
2026-07-21 LBQ611 - Jul 21, 05:40 UTCJul 21, 06:40 UTC1h 0m
2026-07-21 LBQ611 - Jul 21, 02:55 UTCJul 21, 04:50 UTC1h 55m
2026-07-21 LBQ611 - Jul 21, 01:00 UTCJul 21, 02:20 UTC1h 20m
2026-07-18 LBQ640 - Jul 18, 05:20 UTCJul 18, 06:15 UTC55m
2026-07-18 LBQ640 - Jul 18, 03:15 UTCJul 18, 04:30 UTC1h 15m
2026-07-18 LBQ640 - Jul 18, 02:00 UTCJul 18, 02:25 UTC25m
2026-07-18 LBQ640 - Jul 18, 00:00 UTCJul 18, 01:05 UTC1h 5m
2026-07-17 LBQ640 - Jul 17, 05:15 UTCJul 17, 06:10 UTC55m
2026-07-17 LBQ640 - Jul 17, 03:20 UTCJul 17, 04:25 UTC1h 5m
2026-07-17 LBQ640 - Jul 17, 02:10 UTCJul 17, 02:30 UTC20m
2026-07-17 LBQ640 - Jul 17, 00:04 UTCJul 17, 01:05 UTC1h 0m
2026-07-16 LBQ640 - Jul 16, 05:35 UTCJul 16, 06:25 UTC50m
2026-07-16 LBQ640 - Jul 16, 03:30 UTCJul 16, 04:45 UTC1h 15m
2026-07-16 LBQ640 - Jul 16, 02:10 UTCJul 16, 03:20 UTC1h 10m
2026-07-16 LBQ640 - Jul 16, 00:00 UTCJul 16, 01:10 UTC1h 10m
2026-07-15 LBQ640 - Jul 15, 06:50 UTCJul 15, 07:40 UTC50m
2026-07-15 LBQ640 - Jul 15, 04:30 UTCJul 15, 06:05 UTC1h 35m
2026-07-15 LBQ640 - Jul 15, 04:00 UTCJul 15, 04:25 UTC25m
2026-07-15 LBQ640 - Jul 15, 02:00 UTCJul 15, 03:10 UTC1h 10m
2026-07-10 LBQ640 - Jul 10, 05:20 UTCJul 10, 06:15 UTC55m
2026-07-10 LBQ640 - Jul 10, 03:20 UTCJul 10, 04:25 UTC1h 5m
2026-07-10 LBQ640 - Jul 10, 02:20 UTCJul 10, 02:45 UTC25m
2026-07-10 LBQ640 - Jul 10, 00:10 UTCJul 10, 01:25 UTC1h 15m
2026-07-09 LBQ640 - Jul 9, 05:40 UTCJul 9, 06:35 UTC55m
2026-07-09 LBQ640 - Jul 9, 03:45 UTCJul 9, 04:55 UTC1h 10m
2026-07-09 LBQ640 - Jul 9, 02:45 UTCJul 9, 03:10 UTC25m
2026-07-09 LBQ640 - Jul 9, 00:10 UTCJul 9, 01:05 UTC55m
2026-07-08 LBQ612 - Jul 8, 12:15 UTCJul 8, 13:50 UTC1h 35m
2026-07-08 LBQ612 - Jul 8, 10:00 UTCJul 8, 11:20 UTC1h 20m
2026-07-08 LBQ612 - Jul 8, 07:20 UTCJul 8, 08:55 UTC1h 35m
2026-07-08 LBQ611 - Jul 8, 05:25 UTCJul 8, 06:20 UTC55m
2026-07-08 LBQ611 - Jul 8, 00:55 UTCJul 8, 04:10 UTC3h 15m

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 N88QD page for operator, model, and routing details .

Mode-S AC1CDE frequently asked

What is Mode-S code AC1CDE?
AC1CDE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N88QD.
Where is Mode-S AC1CDE registered?
Mode-S code AC1CDE 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 AC1CDE broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC1CDE, octal 53016336, decimal 11,279,582.
What flights does AC1CDE operate?
Mode-S AC1CDE has broadcast 20 distinct callsigns, including LBQ640, LBQ791, LBQ840, LBQ825, LBQ870.