Apparatus

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sensors Mode-S transponder

A9F42B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N740SS · GULFSTREAM 5 · operated by 740SS LLC

Hex
A9F42B
Octal
52372053
Decimal
11,138,091
Country
US
Tail
N740SS
Type
GLF5
No current signal · last broadcast 17d ago
Flights observed
91
Distinct callsigns
1
Country
US
Last broadcast
17d ago

Last known position

Most recent position reported by Mode-S A9F42B.

Country allocation

The ICAO 24-bit address A9F42B 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 1 distinct

Callsign Airline Flights Last seen
N740SS - 91 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N740SS - Jul 26, 18:35 UTCJul 26, 20:50 UTC2h 15m
2026-07-26 N740SS - Jul 26, 13:25 UTCJul 26, 14:50 UTC1h 25m
2026-07-25 N740SS VNY → BNA Jul 25, 19:25 UTCJul 25, 23:05 UTC3h 40m
2026-07-25 N740SS - Jul 25, 00:45 UTCJul 25, 02:25 UTC1h 40m
2026-07-24 N740SS - Jul 24, 21:40 UTCJul 24, 23:15 UTC1h 35m
2026-07-24 N740SS - Jul 24, 20:35 UTCJul 24, 21:00 UTC25m
2026-07-20 N740SS - Jul 20, 17:45 UTCJul 20, 18:15 UTC30m
2026-07-20 N740SS - Jul 20, 14:15 UTCJul 20, 17:25 UTC3h 10m
2026-07-18 N740SS AUS → MMU Jul 18, 16:40 UTCJul 18, 20:35 UTC3h 55m
2026-07-17 N740SS - Jul 17, 23:05 UTCJul 17, 23:35 UTC30m
2026-07-17 N740SS - Jul 17, 21:15 UTCJul 17, 22:25 UTC1h 10m
2026-07-17 N740SS - Jul 17, 13:50 UTCJul 17, 14:55 UTC1h 5m
2026-07-17 N740SS DWH → FTW Jul 17, 11:55 UTCJul 17, 12:40 UTC45m
2026-07-12 N740SS - Jul 12, 19:55 UTCJul 12, 21:00 UTC1h 5m
2026-07-12 N740SS - Jul 12, 11:25 UTCJul 12, 18:55 UTC7h 30m
2026-07-11 N740SS - Jul 11, 20:35 UTCJul 11, 20:55 UTC20m
2026-07-11 N740SS - Jul 11, 17:45 UTCJul 11, 19:55 UTC2h 10m
2026-07-07 N740SS - Jul 7, 16:15 UTCJul 7, 18:40 UTC2h 25m
2026-07-07 N740SS - Jul 7, 14:05 UTCJul 7, 15:10 UTC1h 5m
2026-07-06 N740SS - Jul 6, 21:35 UTCJul 6, 21:50 UTC15m
2026-07-06 N740SS - Jul 6, 18:15 UTCJul 6, 20:45 UTC2h 30m
2026-07-05 N740SS - Jul 5, 15:00 UTCJul 5, 19:20 UTC4h 20m
2026-07-05 N740SS - Jul 5, 12:20 UTCJul 5, 13:50 UTC1h 30m
2026-07-03 N740SS - Jul 3, 21:20 UTCJul 3, 22:10 UTC50m
2026-07-03 N740SS - Jul 3, 18:55 UTCJul 3, 20:25 UTC1h 30m
2026-07-03 N740SS - Jul 3, 17:30 UTCJul 3, 17:45 UTC15m
2026-07-02 N740SS - Jul 2, 18:00 UTCJul 2, 19:40 UTC1h 40m
2026-07-02 N740SS - Jul 2, 15:40 UTCJul 2, 16:00 UTC20m
2026-07-01 N740SS - Jul 1, 15:05 UTCJul 1, 15:45 UTC40m
2026-06-30 N740SS - Jun 30, 21:40 UTCJun 30, 22:30 UTC50m
2026-06-29 N740SS - Jun 29, 22:44 UTCJun 30, 00:25 UTC1h 40m
2026-06-29 N740SS - Jun 29, 21:09 UTCJun 29, 21:54 UTC45m
2026-06-26 N740SS - Jun 26, 14:35 UTCJun 26, 17:04 UTC2h 30m
2026-06-25 N740SS - Jun 25, 22:20 UTCJun 25, 23:05 UTC45m
2026-06-25 N740SS HSH → DWH Jun 25, 17:30 UTCJun 25, 21:25 UTC3h 55m
2026-06-23 N740SS - Jun 23, 00:15 UTCJun 23, 03:15 UTC3h 0m
2026-06-22 N740SS - Jun 22, 22:49 UTCJun 22, 23:35 UTC45m
2026-06-22 N740SS - Jun 22, 21:10 UTCJun 22, 22:10 UTC1h 0m
2026-06-22 N740SS - Jun 22, 17:50 UTCJun 22, 19:49 UTC2h 0m
2026-06-21 N740SS - Jun 21, 21:34 UTCJun 21, 22:04 UTC30m
2026-06-21 N740SS - Jun 21, 16:39 UTCJun 21, 20:24 UTC3h 45m
2026-06-21 N740SS - Jun 21, 14:40 UTCJun 21, 15:05 UTC25m
2026-06-21 N740SS - Jun 21, 12:40 UTCJun 21, 13:09 UTC30m
2026-06-20 N740SS - Jun 20, 17:59 UTCJun 20, 20:45 UTC2h 45m
2026-06-20 N740SS - Jun 20, 16:39 UTCJun 20, 17:04 UTC25m
2026-06-20 N740SS - Jun 20, 13:34 UTCJun 20, 14:59 UTC1h 25m
2026-06-08 N740SS SAN → VNY Jun 8, 18:05 UTCJun 8, 18:35 UTC30m
2026-06-08 N740SS - Jun 8, 15:04 UTCJun 8, 17:30 UTC2h 25m
2026-06-08 N740SS - Jun 8, 00:05 UTCJun 8, 02:10 UTC2h 5m
2026-06-04 N740SS - Jun 4, 01:45 UTCJun 4, 04:10 UTC2h 25m

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 N740SS page for operator, model, and routing details .

Mode-S A9F42B frequently asked

What is Mode-S code A9F42B?
A9F42B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N740SS.
Where is Mode-S A9F42B registered?
Mode-S code A9F42B 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 A9F42B broadcasting right now?
No active broadcast right now. Last signal was 17d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9F42B, octal 52372053, decimal 11,138,091.
What flights does A9F42B operate?
Mode-S A9F42B has broadcast 1 distinct callsign, including N740SS.