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sensors Mode-S transponder

ADC694

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N987QS · operated by TEXTRON AVIATION INC

Hex
ADC694
Octal
53343224
Decimal
11,388,564
Country
US
Tail
N987QS
Type
C68A
No current signal · last broadcast 14h ago
Flights observed
234
Distinct callsigns
2
Country
US
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S ADC694.

Country allocation

The ICAO 24-bit address ADC694 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
EJA987 - 218 2026-07-13
N987QS - 16 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 EJA987 - Jul 13, 18:45 UTCJul 13, 20:40 UTC1h 55m
2026-07-13 EJA987 - Jul 13, 13:45 UTCJul 13, 17:35 UTC3h 50m
2026-07-11 EJA987 - Jul 11, 16:10 UTCJul 11, 16:55 UTC45m
2026-07-11 EJA987 - Jul 11, 02:15 UTCJul 11, 03:15 UTC1h 0m
2026-07-11 EJA987 - Jul 11, 00:20 UTCJul 11, 01:05 UTC45m
2026-07-10 EJA987 - Jul 10, 21:20 UTCJul 10, 21:30 UTC10m
2026-07-10 EJA987 VNY → LAS Jul 10, 19:30 UTCJul 10, 20:20 UTC50m
2026-07-10 EJA987 - Jul 10, 02:45 UTCJul 10, 03:35 UTC50m
2026-07-10 EJA987 - Jul 10, 00:30 UTCJul 10, 01:20 UTC50m
2026-07-08 EJA987 - Jul 8, 22:45 UTCJul 9, 03:10 UTC4h 25m
2026-07-08 EJA987 BOS → LUK Jul 8, 18:55 UTCJul 8, 20:50 UTC1h 55m
2026-07-08 EJA987 BOS → BOS Jul 8, 18:00 UTCJul 8, 18:05 UTC5m
2026-07-08 EJA987 - Jul 8, 15:25 UTCJul 8, 15:45 UTC20m
2026-07-08 EJA987 BED → MVY Jul 8, 14:20 UTCJul 8, 14:40 UTC20m
2026-07-08 EJA987 - Jul 8, 01:25 UTCJul 8, 03:15 UTC1h 50m
2026-07-07 EJA987 - Jul 7, 22:55 UTCJul 7, 23:30 UTC35m
2026-07-07 EJA987 - Jul 7, 17:45 UTCJul 7, 20:20 UTC2h 35m
2026-07-07 EJA987 - Jul 7, 12:10 UTCJul 7, 14:50 UTC2h 40m
2026-07-06 EJA987 - Jul 6, 21:50 UTCJul 6, 23:20 UTC1h 30m
2026-07-06 EJA987 - Jul 6, 19:50 UTCJul 6, 20:55 UTC1h 5m
2026-07-06 EJA987 - Jul 6, 14:45 UTCJul 6, 17:15 UTC2h 30m
2026-07-06 EJA987 - Jul 6, 14:25 UTCJul 6, 14:40 UTC15m
2026-07-06 EJA987 - Jul 6, 13:15 UTCJul 6, 13:35 UTC20m
2026-07-05 EJA987 - Jul 5, 18:20 UTCJul 5, 20:50 UTC2h 30m
2026-07-05 EJA987 - Jul 5, 13:10 UTCJul 5, 15:40 UTC2h 30m
2026-07-04 EJA987 - Jul 4, 16:30 UTCJul 4, 20:00 UTC3h 30m
2026-07-04 EJA987 - Jul 4, 14:15 UTCJul 4, 15:15 UTC1h 0m
2026-07-03 EJA987 - Jul 3, 20:25 UTCJul 3, 22:05 UTC1h 40m
2026-07-03 N987QS CPX → MSY Jul 3, 15:15 UTCJul 3, 19:10 UTC3h 55m
2026-07-03 N987QS - Jul 3, 12:40 UTCJul 3, 12:55 UTC15m
2026-06-24 N987QS - Jun 24, 19:20 UTCJun 24, 19:49 UTC30m
2026-06-24 EJA987 - Jun 24, 14:00 UTCJun 24, 16:34 UTC2h 35m
2026-06-23 EJA987 - Jun 23, 21:10 UTCJun 23, 22:29 UTC1h 20m
2026-06-23 EJA987 - Jun 23, 18:04 UTCJun 23, 19:55 UTC1h 50m
2026-06-23 EJA987 - Jun 23, 15:09 UTCJun 23, 17:34 UTC2h 25m
2026-06-22 EJA987 - Jun 22, 20:10 UTCJun 23, 13:50 UTC17h 40m
2026-06-22 EJA987 - Jun 22, 16:40 UTCJun 22, 18:40 UTC2h 0m
2026-06-22 EJA987 - Jun 22, 12:40 UTCJun 22, 13:54 UTC1h 15m
2026-06-21 EJA987 - Jun 21, 22:04 UTCJun 21, 22:34 UTC30m
2026-06-21 EJA987 - Jun 21, 15:40 UTCJun 21, 19:50 UTC4h 10m
2026-06-21 EJA987 - Jun 21, 13:04 UTCJun 21, 14:10 UTC1h 5m
2026-06-19 EJA987 - Jun 19, 15:44 UTCJun 19, 15:59 UTC15m
2026-06-19 EJA987 - Jun 19, 13:04 UTCJun 19, 14:49 UTC1h 45m
2026-06-19 EJA987 - Jun 19, 11:34 UTCJun 19, 11:54 UTC20m
2026-06-18 EJA987 - Jun 18, 21:50 UTCJun 18, 22:15 UTC25m
2026-06-18 EJA987 - Jun 18, 18:20 UTCJun 18, 20:15 UTC1h 55m
2026-06-18 EJA987 TEB → PTK Jun 18, 15:40 UTCJun 18, 17:15 UTC1h 35m
2026-06-17 EJA987 - Jun 17, 19:30 UTCJun 17, 22:50 UTC3h 20m
2026-06-17 EJA987 - Jun 17, 16:15 UTCJun 17, 17:15 UTC1h 0m
2026-06-17 EJA987 - Jun 17, 14:55 UTCJun 17, 15:10 UTC15m

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 N987QS page for operator, model, and routing details .

Mode-S ADC694 frequently asked

What is Mode-S code ADC694?
ADC694 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N987QS.
Where is Mode-S ADC694 registered?
Mode-S code ADC694 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 ADC694 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 ADC694, octal 53343224, decimal 11,388,564.
What flights does ADC694 operate?
Mode-S ADC694 has broadcast 2 distinct callsigns, including EJA987, N987QS.