Apparatus

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sensors Mode-S transponder

ACDD51

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N928QS · CESSNA 680 Citation Latitude · operated by 130R LLC, CROWN AIR LLC, SHAW DAVID E, HMA GROUP HOLDINGS LLC, CELLA KENNETH, TERRY MARGARET A

Hex
ACDD51
Octal
53156521
Decimal
11,328,849
Country
US
Tail
N928QS
Type
C68A
No current signal · last broadcast 1d ago
Flights observed
104
Distinct callsigns
2
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S ACDD51.

Country allocation

The ICAO 24-bit address ACDD51 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
EJA928 NetJets 103 2026-05-28
N928QS - 1 2026-04-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-28 EJA928 TEB → IAD May 28, 19:15 UTCMay 28, 20:10 UTC55m
2026-05-28 EJA928 TEB → IAD May 28, 15:10 UTCMay 28, 16:20 UTC1h 10m
2026-05-28 EJA928 TEB → IAD May 28, 13:05 UTCMay 28, 14:05 UTC1h 0m
2026-05-28 EJA928 TEB → IAD May 28, 11:05 UTCMay 28, 11:55 UTC50m
2026-05-27 EJA928 TEB → IAD May 27, 11:05 UTCMay 27, 13:00 UTC1h 55m
2026-05-26 EJA928 TEB → IAD May 26, 14:30 UTCMay 26, 16:20 UTC1h 50m
2026-05-26 EJA928 TEB → IAD May 26, 11:00 UTCMay 26, 13:04 UTC2h 5m
2026-05-26 EJA928 TEB → IAD May 26, 03:30 UTCMay 26, 04:04 UTC35m
2026-05-26 EJA928 TEB → IAD May 26, 00:00 UTCMay 26, 02:00 UTC2h 0m
2026-05-25 EJA928 TEB → IAD May 25, 21:30 UTCMay 25, 22:30 UTC1h 0m
2026-05-25 EJA928 TEB → IAD May 25, 19:20 UTCMay 25, 20:04 UTC45m
2026-05-25 EJA928 TEB → IAD May 25, 16:50 UTCMay 25, 17:30 UTC40m
2026-05-23 EJA928 TEB → IAD May 23, 18:25 UTCMay 23, 19:40 UTC1h 15m
2026-05-23 EJA928 TEB → IAD May 23, 16:50 UTCMay 23, 17:45 UTC55m
2026-05-23 EJA928 TEB → IAD May 23, 15:10 UTCMay 23, 15:40 UTC30m
2026-05-23 EJA928 TEB → IAD May 23, 13:55 UTCMay 23, 14:30 UTC35m
2026-05-22 EJA928 TEB → IAD May 22, 17:20 UTCMay 22, 19:20 UTC2h 0m
2026-05-22 EJA928 TEB → IAD May 22, 14:05 UTCMay 22, 16:10 UTC2h 5m
2026-05-22 EJA928 TEB → IAD May 22, 10:55 UTCMay 22, 13:05 UTC2h 10m
2026-05-21 EJA928 TEB → IAD May 21, 20:50 UTCMay 21, 21:15 UTC25m
2026-05-21 EJA928 TEB → IAD May 21, 16:20 UTCMay 21, 17:40 UTC1h 20m
2026-05-12 EJA928 TEB → IAD May 12, 20:05 UTCMay 12, 22:55 UTC2h 50m
2026-05-11 EJA928 TEB → IAD May 11, 01:05 UTCMay 11, 02:10 UTC1h 5m
2026-05-10 EJA928 TEB → IAD May 10, 20:40 UTCMay 10, 22:40 UTC2h 0m
2026-05-10 EJA928 TEB → IAD May 10, 15:05 UTCMay 10, 16:44 UTC1h 40m
2026-05-09 EJA928 TEB → IAD May 9, 17:55 UTCMay 9, 19:19 UTC1h 25m
2026-05-09 EJA928 TEB → IAD May 9, 16:40 UTCMay 9, 16:50 UTC10m
2026-05-09 EJA928 TEB → IAD May 9, 14:40 UTCMay 9, 15:20 UTC40m
2026-05-09 EJA928 TEB → IAD May 9, 12:05 UTCMay 9, 13:00 UTC55m
2026-05-08 EJA928 TEB → IAD May 8, 21:05 UTCMay 8, 21:55 UTC50m
2026-05-08 EJA928 TEB → IAD May 8, 19:00 UTCMay 8, 19:40 UTC40m
2026-05-08 EJA928 TEB → IAD May 8, 14:50 UTCMay 8, 16:55 UTC2h 5m
2026-05-08 EJA928 TEB → IAD May 8, 12:34 UTCMay 8, 13:45 UTC1h 10m
2026-05-07 EJA928 TEB → IAD May 7, 22:10 UTCMay 7, 22:35 UTC25m
2026-05-07 EJA928 TEB → IAD May 7, 17:00 UTCMay 7, 21:10 UTC4h 10m
2026-05-07 EJA928 TEB → IAD May 7, 15:50 UTCMay 7, 16:05 UTC15m
2026-05-06 EJA928 TEB → IAD May 6, 23:25 UTCMay 7, 01:25 UTC2h 0m
2026-05-06 EJA928 TEB → IAD May 6, 21:35 UTCMay 6, 21:50 UTC15m
2026-05-06 EJA928 TEB → IAD May 6, 16:25 UTCMay 6, 20:40 UTC4h 14m
2026-05-06 EJA928 TEB → IAD May 6, 14:25 UTCMay 6, 15:10 UTC45m
2026-05-05 EJA928 TEB → IAD May 5, 23:00 UTCMay 6, 01:20 UTC2h 20m
2026-05-05 EJA928 TEB → IAD May 5, 18:45 UTCMay 5, 19:15 UTC30m
2026-05-05 EJA928 TEB → IAD May 5, 17:10 UTCMay 5, 17:35 UTC25m
2026-05-04 EJA928 TEB → IAD May 4, 21:25 UTCMay 4, 23:35 UTC2h 10m
2026-05-03 EJA928 TEB → IAD May 3, 23:00 UTCMay 3, 23:39 UTC40m
2026-05-03 EJA928 TEB → IAD May 3, 19:05 UTCMay 3, 21:00 UTC1h 55m
2026-05-03 EJA928 TEB → IAD May 3, 17:35 UTCMay 3, 17:45 UTC10m
2026-05-02 EJA928 TEB → IAD May 2, 22:10 UTCMay 2, 22:50 UTC40m
2026-04-30 EJA928 TEB → IAD Apr 30, 22:50 UTCMay 1, 03:05 UTC4h 15m
2026-04-30 EJA928 TEB → IAD Apr 30, 19:50 UTCApr 30, 21:00 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 N928QS page for operator, model, and routing details .

Mode-S ACDD51 frequently asked

What is Mode-S code ACDD51?
ACDD51 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N928QS.
Where is Mode-S ACDD51 registered?
Mode-S code ACDD51 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 ACDD51 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACDD51, octal 53156521, decimal 11,328,849.
What flights does ACDD51 operate?
Mode-S ACDD51 has broadcast 2 distinct callsigns, including EJA928, N928QS.