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
Broadcasting now · callsign AFR923 · 40,000 ft
Flights observed
79
Distinct callsigns
20
Country
FR
Last broadcast
14h ago

Current position

3949F8 is currently broadcasting. Map zoomed to live position.

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
AFR186 Air France 9 2026-05-25
AFR935 Air France 6 2026-05-16
AFR187 Air France 6 2026-05-26
AFR828 Air France 4 2026-05-30
AFR343 Air France 4 2026-05-29
AFR342T Air France 4 2026-05-29
AFR116 Air France 4 2026-05-06
AFR111 Air France 4 2026-05-06
AFR284 Air France 3 2026-06-01
AFR283 Air France 3 2026-06-01
AFR217 Air France 3 2026-05-18
AFR940 Air France 2 2026-05-17
AFR926 Air France 2 2026-06-02
AFR809 Air France 2 2026-05-21
AFR719A Air France 2 2026-04-26
AFR718 Air France 2 2026-04-25
AFR377 Air France 2 2026-04-22
AFR358P Air France 2 2026-05-26
AFR934 Air France 1 2026-05-15
AFR923 Air France 1 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 AFR926 CDG → LBV Jun 2, 09:55 UTCJun 2, 11:25 UTC1h 30m
2026-06-01 AFR283 CDG → NRT Jun 1, 19:45 UTCJun 2, 04:15 UTC8h 30m
2026-06-01 AFR284 NRT → CDG Jun 1, 09:25 UTCJun 1, 16:50 UTC7h 25m
2026-05-30 AFR828 CDG → NBO May 30, 17:45 UTCMay 30, 17:55 UTC10m
2026-05-30 AFR828 CDG → NBO May 30, 09:50 UTCMay 30, 12:45 UTC2h 55m
2026-05-29 AFR343 YUL → CDG May 29, 21:55 UTCMay 30, 04:30 UTC6h 35m
2026-05-29 AFR342T CDG → YUL May 29, 09:45 UTCMay 29, 16:30 UTC6h 45m
2026-05-27 AFR805 COO → CDG May 27, 15:05 UTCMay 28, 06:10 UTC15h 5m
2026-05-27 AFR4081 YUL → CDG May 27, 05:14 UTCMay 27, 12:10 UTC6h 55m
2026-05-26 AFR358P CDG → YYZ May 26, 19:10 UTCMay 27, 02:34 UTC7h 25m
2026-05-26 AFR187 CDG → LAS May 26, 00:29 UTCMay 26, 14:55 UTC14h 25m
2026-05-25 AFR186 LAS → CDG May 25, 08:10 UTCMay 25, 20:55 UTC12h 44m
2026-05-24 AFR283 CDG → NRT May 24, 19:55 UTCMay 25, 04:15 UTC8h 20m
2026-05-24 AFR284 NRT → CDG May 24, 09:25 UTCMay 24, 17:15 UTC7h 50m
2026-05-23 AFR009 - May 23, 08:10 UTCMay 23, 14:25 UTC6h 15m
2026-05-22 AFR010 CDG → JFK May 22, 22:15 UTCMay 23, 05:45 UTC7h 29m
2026-05-21 AFR809 FDF → CDG May 21, 14:05 UTCMay 22, 08:30 UTC18h 25m
2026-05-21 AFR809 FDF → CDG May 21, 13:45 UTCMay 22, 08:30 UTC18h 45m
2026-05-20 AFR923 LBV → CDG May 20, 00:50 UTCMay 20, 03:25 UTC2h 35m
2026-05-19 AFR926 CDG → LBV May 19, 08:55 UTCMay 19, 15:25 UTC6h 30m
2026-05-18 AFR217 BOM → CDG May 18, 20:15 UTCMay 19, 05:10 UTC8h 55m
2026-05-18 AFR218 CDG → BOM May 18, 08:55 UTCMay 18, 17:55 UTC9h 0m
2026-05-17 AFR940 CDG → COO May 17, 10:05 UTCMay 18, 05:30 UTC19h 25m
2026-05-17 AFR940 CDG → COO May 17, 08:50 UTCMay 18, 05:30 UTC20h 40m
2026-05-16 AFR935 TNR → CDG May 16, 05:30 UTCMay 16, 08:55 UTC3h 26m
2026-05-15 AFR935 TNR → CDG May 15, 12:05 UTCMay 16, 08:55 UTC20h 50m
2026-05-15 AFR935 TNR → CDG May 15, 10:05 UTCMay 16, 08:55 UTC22h 50m
2026-05-15 AFR934 CDG → TNR May 15, 08:55 UTCMay 16, 08:01 UTC23h 6m
2026-05-15 AFR829 COF → COF May 15, 01:45 UTCMay 15, 05:20 UTC3h 35m
2026-05-14 AFR828 CDG → NBO May 14, 17:05 UTCMay 14, 17:20 UTC15m
2026-05-14 AFR828 CDG → NBO May 14, 09:25 UTCMay 14, 12:10 UTC2h 45m
2026-05-13 AFR283 CDG → NRT May 13, 19:45 UTCMay 14, 04:20 UTC8h 35m
2026-05-13 AFR284 NRT → CDG May 13, 09:50 UTCMay 13, 17:30 UTC7h 40m
2026-05-09 AFR380V SNN → CDG May 9, 17:35 UTCMay 9, 18:50 UTC1h 15m
2026-05-06 AFR111 PVG → CDG May 6, 08:20 UTCMay 7, 02:55 UTC18h 34m
2026-05-06 AFR111 PVG → CDG May 6, 02:05 UTCMay 7, 02:00 UTC23h 54m
2026-05-06 AFR116 CDG → PVG May 6, 00:05 UTCMay 6, 23:55 UTC23h 49m
2026-05-05 AFR116 CDG → PVG May 5, 22:10 UTCMay 6, 15:35 UTC17h 25m
2026-05-05 AFR187 CDG → LAS May 5, 00:15 UTCMay 5, 13:40 UTC13h 25m
2026-05-04 AFR186 LAS → CDG May 4, 08:00 UTCMay 4, 20:45 UTC12h 46m
2026-05-03 AFR343 YUL → CDG May 3, 21:29 UTCMay 4, 03:49 UTC6h 20m
2026-05-03 AFR342T CDG → YUL May 3, 09:05 UTCMay 3, 15:55 UTC6h 50m
2026-05-02 AFR935 TNR → CDG May 2, 06:10 UTCMay 2, 09:25 UTC3h 15m
2026-05-01 AFR935 TNR → CDG May 1, 12:05 UTCMay 2, 09:25 UTC21h 20m
2026-05-01 AFR935 TNR → CDG May 1, 10:25 UTCMay 2, 09:25 UTC23h 0m
2026-04-30 AFR111 PVG → CDG Apr 30, 08:10 UTCMay 1, 03:50 UTC19h 40m
2026-04-30 AFR111 PVG → CDG Apr 30, 02:05 UTCMay 1, 00:20 UTC22h 15m
2026-04-30 AFR116 CDG → PVG Apr 30, 00:05 UTCMay 1, 00:00 UTC23h 55m
2026-04-29 AFR116 CDG → PVG Apr 29, 22:15 UTCApr 30, 15:55 UTC17h 39m
2026-04-29 AFR187 CDG → LAS Apr 29, 00:10 UTCApr 29, 14:00 UTC13h 51m

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?
Yes. Mode-S 3949F8 is currently airborne.
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 AFR186, AFR935, AFR187, AFR828, AFR343.