Apparatus

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sensors Mode-S transponder

ADCA4B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N988QS · operated by TEXTRON AVIATION INC

Hex
ADCA4B
Octal
53345113
Decimal
11,389,515
Country
US
Tail
N988QS
Type
C68A
No current signal · last broadcast 14h ago
Flights observed
131
Distinct callsigns
5
Country
US
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S ADCA4B.

Country allocation

The ICAO 24-bit address ADCA4B 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 5 distinct

Callsign Airline Flights Last seen
EJA988 NetJets 122 2026-06-04
N988QS - 6 2026-05-18
CITT95 - 1 2026-04-13
CITT90 - 1 2026-04-20
CITT52 - 1 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-04 EJA988 FLL → MDW Jun 4, 19:15 UTCJun 4, 20:00 UTC45m
2026-06-04 EJA988 FLL → MDW Jun 4, 16:35 UTCJun 4, 17:15 UTC40m
2026-06-04 EJA988 FLL → MDW Jun 4, 14:20 UTCJun 4, 15:15 UTC55m
2026-06-04 EJA988 FLL → MDW Jun 4, 12:05 UTCJun 4, 12:30 UTC25m
2026-06-03 EJA988 FLL → MDW Jun 3, 18:05 UTCJun 3, 20:10 UTC2h 5m
2026-06-03 EJA988 FLL → MDW Jun 3, 12:30 UTCJun 3, 13:10 UTC40m
2026-06-02 EJA988 FLL → MDW Jun 2, 20:20 UTCJun 2, 21:40 UTC1h 20m
2026-06-02 EJA988 FLL → MDW Jun 2, 15:40 UTCJun 2, 17:00 UTC1h 20m
2026-06-02 EJA988 FLL → MDW Jun 2, 12:30 UTCJun 2, 14:15 UTC1h 45m
2026-06-01 EJA988 FLL → MDW Jun 1, 21:55 UTCJun 1, 22:45 UTC50m
2026-06-01 EJA988 FLL → MDW Jun 1, 19:50 UTCJun 1, 21:05 UTC1h 15m
2026-06-01 EJA988 FLL → MDW Jun 1, 17:40 UTCJun 1, 18:50 UTC1h 10m
2026-06-01 EJA988 FLL → MDW Jun 1, 14:10 UTCJun 1, 15:00 UTC50m
2026-06-01 EJA988 FLL → MDW Jun 1, 11:55 UTCJun 1, 12:50 UTC55m
2026-05-31 EJA988 FLL → MDW May 31, 20:15 UTCMay 31, 23:00 UTC2h 45m
2026-05-31 EJA988 FLL → MDW May 31, 17:25 UTCMay 31, 18:10 UTC45m
2026-05-31 EJA988 FLL → MDW May 31, 14:25 UTCMay 31, 16:30 UTC2h 5m
2026-05-31 EJA988 FLL → MDW May 31, 12:15 UTCMay 31, 12:55 UTC40m
2026-05-30 EJA988 FLL → MDW May 30, 14:50 UTCMay 30, 17:25 UTC2h 35m
2026-05-29 EJA988 FLL → MDW May 29, 19:55 UTCMay 29, 22:50 UTC2h 55m
2026-05-29 EJA988 FLL → MDW May 29, 17:45 UTCMay 29, 18:15 UTC30m
2026-05-28 EJA988 FLL → MDW May 28, 21:10 UTCMay 28, 22:30 UTC1h 20m
2026-05-28 EJA988 FLL → MDW May 28, 17:50 UTCMay 28, 20:40 UTC2h 50m
2026-05-28 EJA988 FLL → MDW May 28, 15:10 UTCMay 28, 16:50 UTC1h 40m
2026-05-27 EJA988 FLL → MDW May 27, 21:40 UTCMay 27, 23:05 UTC1h 25m
2026-05-27 EJA988 FLL → MDW May 27, 19:15 UTCMay 27, 20:25 UTC1h 10m
2026-05-27 EJA988 FLL → MDW May 27, 13:05 UTCMay 27, 18:10 UTC5h 5m
2026-05-27 EJA988 FLL → MDW May 27, 11:35 UTCMay 27, 11:50 UTC15m
2026-05-26 EJA988 FLL → MDW May 26, 19:15 UTCMay 26, 19:55 UTC40m
2026-05-26 EJA988 FLL → MDW May 26, 12:10 UTCMay 26, 14:00 UTC1h 50m
2026-05-25 EJA988 FLL → MDW May 25, 21:09 UTCMay 25, 22:19 UTC1h 10m
2026-05-25 EJA988 FLL → MDW May 25, 18:35 UTCMay 25, 19:59 UTC1h 24m
2026-05-25 EJA988 FLL → MDW May 25, 15:15 UTCMay 25, 17:35 UTC2h 20m
2026-05-25 EJA988 FLL → MDW May 25, 12:50 UTCMay 25, 13:45 UTC55m
2026-05-24 EJA988 FLL → MDW May 24, 21:20 UTCMay 24, 23:46 UTC2h 26m
2026-05-24 EJA988 FLL → MDW May 24, 15:15 UTCMay 24, 18:00 UTC2h 45m
2026-05-23 EJA988 FLL → MDW May 23, 19:55 UTCMay 23, 20:40 UTC45m
2026-05-23 EJA988 FLL → MDW May 23, 16:20 UTCMay 23, 18:55 UTC2h 35m
2026-05-23 EJA988 FLL → MDW May 23, 14:20 UTCMay 23, 15:00 UTC40m
2026-05-22 EJA988 FLL → MDW May 22, 22:20 UTCMay 23, 00:20 UTC2h 0m
2026-05-22 EJA988 FLL → MDW May 22, 19:00 UTCMay 22, 21:05 UTC2h 5m
2026-05-22 EJA988 FLL → MDW May 22, 16:35 UTCMay 22, 17:50 UTC1h 15m
2026-05-22 EJA988 FLL → MDW May 22, 14:30 UTCMay 22, 15:30 UTC1h 0m
2026-05-21 EJA988 FLL → MDW May 21, 22:25 UTCMay 22, 00:25 UTC2h 0m
2026-05-21 EJA988 FLL → MDW May 21, 20:25 UTCMay 21, 21:15 UTC50m
2026-05-21 EJA988 FLL → MDW May 21, 18:10 UTCMay 21, 18:55 UTC45m
2026-05-21 EJA988 FLL → MDW May 21, 15:25 UTCMay 21, 16:45 UTC1h 20m
2026-05-21 EJA988 FLL → MDW May 21, 02:00 UTCMay 21, 02:20 UTC20m
2026-05-20 EJA988 FLL → MDW May 20, 22:00 UTCMay 21, 00:30 UTC2h 30m
2026-05-20 EJA988 FLL → MDW May 20, 17:00 UTCMay 20, 20:05 UTC3h 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 N988QS page for operator, model, and routing details .

Mode-S ADCA4B frequently asked

What is Mode-S code ADCA4B?
ADCA4B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N988QS.
Where is Mode-S ADCA4B registered?
Mode-S code ADCA4B 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 ADCA4B broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADCA4B, octal 53345113, decimal 11,389,515.
What flights does ADCA4B operate?
Mode-S ADCA4B has broadcast 5 distinct callsigns, including EJA988, N988QS, CITT95, CITT90, CITT52.