Apparatus

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sensors Mode-S transponder

A91EA7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N687QS · CESSNA 680 Citation Latitude · operated by NETJETS SALES INC, CONMED CORP, DGKW LLC, GWT AIR LLC, LF AVIATION LLC, LIGHTHOUSE IMPORT CO

Hex
A91EA7
Octal
52217247
Decimal
11,083,431
Country
US
Tail
N687QS
Type
C68A
No current signal · last broadcast 6d ago
Flights observed
133
Distinct callsigns
2
Country
US
Last broadcast
6d ago

Last known position

Most recent position reported by Mode-S A91EA7.

Country allocation

The ICAO 24-bit address A91EA7 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
EJA687 - 132 2026-07-08
N687QS - 1 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-08 N687QS - Jul 8, 18:30 UTCJul 8, 18:55 UTC25m
2026-07-08 EJA687 - Jul 8, 15:45 UTCJul 8, 17:10 UTC1h 25m
2026-07-08 EJA687 - Jul 8, 13:55 UTCJul 8, 14:10 UTC15m
2026-07-07 EJA687 - Jul 7, 21:35 UTCJul 7, 22:20 UTC45m
2026-07-07 EJA687 - Jul 7, 20:10 UTCJul 7, 20:55 UTC45m
2026-07-07 EJA687 - Jul 7, 16:00 UTCJul 7, 18:55 UTC2h 55m
2026-07-01 EJA687 - Jul 1, 18:50 UTCJul 1, 20:10 UTC1h 20m
2026-07-01 EJA687 - Jul 1, 13:10 UTCJul 1, 14:10 UTC1h 0m
2026-06-30 EJA687 BJC → TEB Jun 30, 22:40 UTCJul 1, 02:05 UTC3h 25m
2026-06-30 EJA687 - Jun 30, 03:25 UTCJun 30, 07:10 UTC3h 45m
2026-06-30 EJA687 - Jun 30, 00:00 UTCJun 30, 01:40 UTC1h 41m
2026-06-29 EJA687 VNY → MDW Jun 29, 15:49 UTCJun 29, 19:24 UTC3h 35m
2026-06-29 EJA687 SBA → VNY Jun 29, 14:19 UTCJun 29, 14:39 UTC20m
2026-06-28 EJA687 ORD → SBA Jun 28, 22:04 UTCJun 29, 02:45 UTC4h 40m
2026-06-28 EJA687 - Jun 28, 15:05 UTCJun 28, 17:04 UTC2h 0m
2026-06-27 EJA687 - Jun 27, 20:49 UTCJun 27, 21:40 UTC50m
2026-06-27 EJA687 FOK → BUF Jun 27, 18:35 UTCJun 27, 19:49 UTC1h 15m
2026-06-27 EJA687 - Jun 27, 16:10 UTCJun 27, 17:04 UTC55m
2026-06-27 EJA687 - Jun 27, 14:20 UTCJun 27, 15:14 UTC55m
2026-06-26 EJA687 - Jun 26, 20:20 UTCJun 26, 23:55 UTC3h 35m
2026-06-26 EJA687 - Jun 26, 17:29 UTCJun 26, 18:15 UTC45m
2026-06-26 EJA687 - Jun 26, 15:10 UTCJun 26, 16:20 UTC1h 10m
2026-06-26 EJA687 - Jun 26, 13:34 UTCJun 26, 13:45 UTC10m
2026-06-25 EJA687 - Jun 25, 20:14 UTCJun 26, 00:55 UTC4h 40m
2026-06-25 EJA687 COS → TEB Jun 25, 15:34 UTCJun 25, 18:55 UTC3h 20m
2026-06-25 EJA687 - Jun 25, 12:40 UTCJun 25, 13:50 UTC1h 10m
2026-06-24 EJA687 - Jun 24, 21:40 UTCJun 24, 23:20 UTC1h 40m
2026-06-24 EJA687 - Jun 24, 18:15 UTCJun 24, 19:44 UTC1h 30m
2026-06-24 EJA687 - Jun 24, 16:05 UTCJun 24, 16:45 UTC40m
2026-06-24 EJA687 - Jun 24, 13:30 UTCJun 24, 15:09 UTC1h 40m
2026-06-23 EJA687 - Jun 23, 19:15 UTCJun 23, 21:39 UTC2h 25m
2026-06-23 EJA687 - Jun 23, 17:09 UTCJun 23, 17:30 UTC20m
2026-06-22 EJA687 FOK → DAL Jun 22, 16:34 UTCJun 22, 20:30 UTC3h 55m
2026-06-22 EJA687 - Jun 22, 14:45 UTCJun 22, 15:10 UTC25m
2026-06-22 EJA687 - Jun 22, 12:25 UTCJun 22, 12:40 UTC15m
2026-06-21 EJA687 - Jun 21, 21:34 UTCJun 21, 22:10 UTC35m
2026-06-21 EJA687 BED → ACK Jun 21, 17:35 UTCJun 21, 18:00 UTC25m
2026-06-21 EJA687 - Jun 21, 14:10 UTCJun 21, 16:19 UTC2h 10m
2026-06-21 EJA687 - Jun 21, 12:04 UTCJun 21, 12:49 UTC45m
2026-06-21 EJA687 - Jun 21, 03:40 UTCJun 21, 04:54 UTC1h 15m
2026-06-20 EJA687 - Jun 20, 23:55 UTCJun 21, 00:10 UTC15m
2026-06-20 EJA687 LUK → TEB Jun 20, 18:54 UTCJun 20, 20:25 UTC1h 30m
2026-06-20 EJA687 - Jun 20, 15:14 UTCJun 20, 17:34 UTC2h 20m
2026-06-20 EJA687 - Jun 20, 13:34 UTCJun 20, 13:44 UTC10m
2026-06-18 EJA687 - Jun 18, 18:55 UTCJun 18, 19:15 UTC20m
2026-06-18 EJA687 - Jun 18, 14:20 UTCJun 18, 17:10 UTC2h 50m
2026-06-17 EJA687 - Jun 17, 23:05 UTCJun 17, 23:50 UTC45m
2026-06-17 EJA687 - Jun 17, 20:55 UTCJun 17, 22:05 UTC1h 10m
2026-06-17 EJA687 - Jun 17, 17:35 UTCJun 17, 18:15 UTC40m
2026-06-17 EJA687 - Jun 17, 15:05 UTCJun 17, 15:50 UTC45m

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 N687QS page for operator, model, and routing details .

Mode-S A91EA7 frequently asked

What is Mode-S code A91EA7?
A91EA7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N687QS.
Where is Mode-S A91EA7 registered?
Mode-S code A91EA7 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 A91EA7 broadcasting right now?
No active broadcast right now. Last signal was 6d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A91EA7, octal 52217247, decimal 11,083,431.
What flights does A91EA7 operate?
Mode-S A91EA7 has broadcast 2 distinct callsigns, including EJA687, N687QS.