Apparatus

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sensors Mode-S transponder

3949F8

ICAO 24-bit transponder address · allocated to France

Currently assigned to F-GSPY · BOEING 777-200

Hex
3949F8
Octal
16244770
Decimal
3,754,488
Country
FR
Tail
F-GSPY
Type
B772
No current signal · last broadcast 3h ago
Flights observed
156
Distinct callsigns
20
Country
FR
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 3949F8.

Country allocation

The ICAO 24-bit address 3949F8 falls within the block assigned to France (FR) by ICAO Annex 10, Volume III. Every aircraft registered in France 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 20 distinct

Callsign Airline Flights Last seen
AFR217 - 10 2026-07-01
AFR283 - 9 2026-06-30
AFR186 Air France 9 2026-05-25
AFR284 - 8 2026-06-30
AFR218 - 7 2026-07-01
AFR935 Air France 6 2026-05-16
AFR828 - 6 2026-06-14
AFR187 Air France 6 2026-05-26
AFR805 - 5 2026-06-27
AFR343 - 5 2026-06-17
AFR342T - 5 2026-06-17
AFR501 - 4 2026-07-18
AFR378E - 4 2026-07-04
AFR377 - 4 2026-07-04
AFR116 Air France 4 2026-05-06
AFR111 Air France 4 2026-05-06
AFR902 Air France 3 2026-06-04
AFR89U - 3 2026-07-15
AFR500 - 3 2026-07-17
AFR431 - 3 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 AFR501 - Jul 18, 00:39 UTCJul 18, 03:30 UTC2h 51m
2026-07-17 AFR500 - Jul 17, 08:49 UTCJul 17, 20:25 UTC11h 35m
2026-07-16 AFR327 - Jul 16, 21:25 UTCJul 17, 03:45 UTC6h 20m
2026-07-16 AFR328K - Jul 16, 12:09 UTCJul 16, 19:10 UTC7h 0m
2026-07-15 AFR132 - Jul 15, 14:20 UTCJul 16, 04:55 UTC14h 35m
2026-07-15 AFR89U MSP → CDG Jul 15, 01:10 UTCJul 15, 08:55 UTC7h 45m
2026-07-14 AFR088 CDG → MSP Jul 14, 14:20 UTCJul 14, 22:30 UTC8h 10m
2026-07-14 AFR89U MSP → CDG Jul 14, 01:15 UTCJul 14, 09:20 UTC8h 5m
2026-07-13 AFR088 - Jul 13, 14:20 UTCJul 13, 22:50 UTC8h 30m
2026-07-13 AFR359P YYZ → CDG Jul 13, 03:45 UTCJul 13, 10:45 UTC7h 0m
2026-07-12 AFR358P - Jul 12, 17:05 UTCJul 13, 00:25 UTC7h 20m
2026-07-08 AFR35T - Jul 8, 02:50 UTCJul 8, 10:50 UTC8h 0m
2026-07-07 AFR34N - Jul 7, 15:05 UTCJul 7, 23:40 UTC8h 35m
2026-07-07 AFR59N DEN → CDG Jul 7, 00:40 UTCJul 7, 09:20 UTC8h 40m
2026-07-06 AFR58P - Jul 6, 11:45 UTCJul 6, 21:20 UTC9h 35m
2026-07-06 AFR89U - Jul 6, 01:25 UTCJul 6, 09:00 UTC7h 35m
2026-07-05 AFR088 - Jul 5, 14:10 UTCJul 5, 22:30 UTC8h 20m
2026-07-05 AFR345M YUL → CDG Jul 5, 00:35 UTCJul 5, 06:35 UTC6h 0m
2026-07-04 AFR344 - Jul 4, 14:35 UTCJul 4, 21:35 UTC7h 0m
2026-07-04 AFR377 - Jul 4, 04:50 UTCJul 4, 11:50 UTC7h 0m
2026-07-04 AFR378E BOS → DTW Jul 4, 00:30 UTCJul 4, 02:05 UTC1h 35m
2026-07-03 AFR378E CDG → BOS Jul 3, 14:50 UTCJul 3, 22:25 UTC7h 35m
2026-07-03 AFR501 - Jul 3, 00:35 UTCJul 3, 11:00 UTC10h 25m
2026-07-02 AFR500 - Jul 2, 09:05 UTCJul 2, 20:40 UTC11h 35m
2026-07-01 AFR217 - Jul 1, 20:30 UTCJul 2, 05:25 UTC8h 55m
2026-07-01 AFR218 - Jul 1, 09:50 UTCJul 1, 18:10 UTC8h 20m
2026-06-30 AFR283 DEL → CDG Jun 30, 19:55 UTCJul 1, 04:15 UTC8h 20m
2026-06-30 AFR284 - Jun 30, 10:05 UTCJun 30, 17:40 UTC7h 35m
2026-06-29 AFR327 YOW → CDG Jun 29, 21:30 UTCJun 30, 03:40 UTC6h 11m
2026-06-29 AFR328K - Jun 29, 11:45 UTCJun 29, 18:55 UTC7h 10m
2026-06-29 AFR377 - Jun 29, 01:20 UTCJun 29, 08:35 UTC7h 15m
2026-06-28 AFR378E - Jun 28, 14:30 UTCJun 28, 22:10 UTC7h 40m
2026-06-27 AFR805 - Jun 27, 14:35 UTCJun 28, 05:45 UTC15h 10m
2026-06-26 AFR431 - Jun 26, 22:14 UTCJun 27, 11:25 UTC13h 10m
2026-06-26 AFR431 - Jun 26, 12:34 UTCJun 27, 11:25 UTC22h 50m
2026-06-25 AFR874 - Jun 25, 12:04 UTCJun 26, 07:05 UTC19h 0m
2026-06-25 AFR874 - Jun 25, 10:09 UTCJun 26, 07:05 UTC20h 55m
2026-06-24 AFR217 - Jun 24, 20:24 UTCJun 25, 05:25 UTC9h 0m
2026-06-24 AFR218 - Jun 24, 09:15 UTCJun 24, 17:40 UTC8h 25m
2026-06-23 AFR283 - Jun 23, 19:59 UTCJun 24, 04:15 UTC8h 15m
2026-06-23 AFR284 - Jun 23, 09:24 UTCJun 23, 16:59 UTC7h 35m
2026-06-22 AFR217 - Jun 22, 20:10 UTCJun 23, 05:15 UTC9h 5m
2026-06-22 AFR218 - Jun 22, 09:19 UTCJun 22, 17:40 UTC8h 20m
2026-06-21 AFR947 - Jun 21, 10:54 UTCJun 22, 04:00 UTC17h 5m
2026-06-20 AFR217 - Jun 20, 20:14 UTCJun 21, 05:10 UTC8h 55m
2026-06-20 AFR218 - Jun 20, 09:19 UTCJun 20, 17:34 UTC8h 15m
2026-06-19 AFR805 - Jun 19, 14:39 UTCJun 20, 05:54 UTC15h 15m
2026-06-19 AFR217 - Jun 19, 01:24 UTCJun 19, 05:24 UTC4h 0m
2026-06-18 AFR217 - Jun 18, 20:20 UTCJun 19, 01:19 UTC4h 59m
2026-06-18 AFR218 - Jun 18, 09:45 UTCJun 18, 18:00 UTC8h 15m

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 F-GSPY page for operator, model, and routing details .

Mode-S 3949F8 frequently asked

What is Mode-S code 3949F8?
3949F8 is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-GSPY.
Where is Mode-S 3949F8 registered?
Mode-S code 3949F8 is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3949F8 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3949F8, octal 16244770, decimal 3,754,488.
What flights does 3949F8 operate?
Mode-S 3949F8 has broadcast 20 distinct callsigns, including AFR217, AFR283, AFR186, AFR284, AFR218.