Apparatus

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sensors Mode-S transponder

3951C2

ICAO 24-bit transponder address · allocated to France

Currently assigned to F-GUOC · BOEING 777-200LR

Hex
3951C2
Octal
16250702
Decimal
3,756,482
Country
FR
Tail
F-GUOC
Type
B77L
No current signal · last broadcast 1h ago
Flights observed
125
Distinct callsigns
20
Country
FR
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 3951C2.

Country allocation

The ICAO 24-bit address 3951C2 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
AFR6733 Air France 19 2026-05-26
AFR6727 Air France 14 2026-05-21
AFR6732 Air France 11 2026-05-25
AFR6735 Air France 10 2026-05-23
AFR6726 Air France 8 2026-05-20
AFR6741 Air France 7 2026-05-25
AFR6738 Air France 7 2026-05-12
AFR6722 Air France 7 2026-05-29
AFR6740 Air France 6 2026-05-24
AFR6739 Air France 6 2026-05-13
AFR6737 Air France 5 2026-05-24
AFR6736 Air France 5 2026-05-23
AFR6734 Air France 5 2026-05-22
AFR6721 Air France 4 2026-05-27
AFR6723 Air France 3 2026-04-18
AFR6720 Air France 3 2026-05-26
AFR6731 Air France 2 2026-05-07
AFR6730 Air France 1 2026-05-06
AFR6729 Air France 1 2026-05-28
AFR6728 Air France 1 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 AFR6722 CDG → MEX May 29, 13:00 UTCMay 30, 00:00 UTC11h 0m
2026-05-28 AFR6729 PEK → CDG May 28, 21:45 UTCMay 29, 09:50 UTC12h 5m
2026-05-28 AFR6728 CDG → PEK May 28, 07:40 UTCMay 28, 17:50 UTC10h 10m
2026-05-27 AFR6721 GDL → CDG May 27, 13:30 UTCMay 28, 03:35 UTC14h 5m
2026-05-26 AFR6720 CDG → MEX May 26, 22:05 UTCMay 27, 09:00 UTC10h 55m
2026-05-26 AFR6733 ORD → CDG May 26, 16:00 UTCMay 26, 17:25 UTC1h 25m
2026-05-26 AFR6733 ORD → CDG May 26, 07:05 UTCMay 26, 13:40 UTC6h 35m
2026-05-25 AFR6732 CDG → ORD May 25, 18:40 UTCMay 26, 02:55 UTC8h 14m
2026-05-25 AFR6741 ORD → CDG May 25, 07:10 UTCMay 25, 14:40 UTC7h 30m
2026-05-24 AFR6740 CDG → ORD May 24, 19:40 UTCMay 25, 04:05 UTC8h 25m
2026-05-24 AFR6737 ORD → CDG May 24, 09:35 UTCMay 24, 17:05 UTC7h 30m
2026-05-23 AFR6736 CDG → ORD May 23, 21:35 UTCMay 24, 05:50 UTC8h 15m
2026-05-23 AFR6735 DUB → CDG May 23, 17:20 UTCMay 23, 18:30 UTC1h 11m
2026-05-23 AFR6735 DUB → CDG May 23, 08:10 UTCMay 23, 14:50 UTC6h 40m
2026-05-22 AFR6734 CDG → ORD May 22, 20:20 UTCMay 23, 04:30 UTC8h 9m
2026-05-22 AFR6733 ORD → CDG May 22, 09:30 UTCMay 22, 16:25 UTC6h 55m
2026-05-21 AFR6732 CDG → ORD May 21, 22:35 UTCMay 22, 06:45 UTC8h 10m
2026-05-21 AFR6727 BOM → CDG May 21, 07:55 UTCMay 21, 16:50 UTC8h 55m
2026-05-20 AFR6726 CDG → BOM May 20, 18:40 UTCMay 21, 03:30 UTC8h 50m
2026-05-18 AFR6721 GDL → CDG May 18, 17:35 UTCMay 19, 03:35 UTC9h 59m
2026-05-17 AFR6720 CDG → MEX May 17, 21:35 UTCMay 18, 08:55 UTC11h 20m
2026-05-17 AFR6737 ORD → CDG May 17, 10:45 UTCMay 17, 18:15 UTC7h 30m
2026-05-16 AFR6736 CDG → ORD May 16, 22:30 UTCMay 17, 06:45 UTC8h 15m
2026-05-16 AFR6735 DUB → CDG May 16, 18:40 UTCMay 16, 20:00 UTC1h 20m
2026-05-16 AFR6735 DUB → CDG May 16, 09:25 UTCMay 16, 16:10 UTC6h 45m
2026-05-15 AFR6734 CDG → ORD May 15, 21:20 UTCMay 16, 05:51 UTC8h 31m
2026-05-15 AFR6733 ORD → CDG May 15, 16:40 UTCMay 15, 17:50 UTC1h 10m
2026-05-15 AFR6733 ORD → CDG May 15, 08:10 UTCMay 15, 15:00 UTC6h 49m
2026-05-14 AFR6732 CDG → ORD May 14, 20:45 UTCMay 15, 04:55 UTC8h 10m
2026-05-13 AFR6727 BOM → CDG May 13, 22:40 UTCMay 14, 17:40 UTC19h 0m
2026-05-13 AFR6727 BOM → CDG May 13, 20:35 UTCMay 14, 17:40 UTC21h 5m
2026-05-13 AFR6727 BOM → CDG May 13, 18:45 UTCMay 14, 17:40 UTC22h 55m
2026-05-13 AFR6739 PIK → CDG May 13, 07:35 UTCMay 13, 15:15 UTC7h 40m
2026-05-12 AFR6738 CDG → ORD May 12, 20:20 UTCMay 13, 04:45 UTC8h 25m
2026-05-12 AFR6733 ORD → CDG May 12, 14:25 UTCMay 12, 15:45 UTC1h 20m
2026-05-12 AFR6733 ORD → CDG May 12, 06:15 UTCMay 12, 12:50 UTC6h 35m
2026-05-12 AFR6732 CDG → ORD May 12, 02:45 UTCMay 12, 03:05 UTC20m
2026-05-11 AFR6732 CDG → ORD May 11, 18:40 UTCMay 11, 19:30 UTC50m
2026-05-11 AFR6741 ORD → CDG May 11, 07:20 UTCMay 11, 14:55 UTC7h 35m
2026-05-10 AFR6740 CDG → ORD May 10, 19:54 UTCMay 11, 04:15 UTC8h 20m
2026-05-10 AFR6737 ORD → CDG May 10, 09:15 UTCMay 10, 16:40 UTC7h 25m
2026-05-09 AFR6736 CDG → ORD May 9, 21:30 UTCMay 10, 06:00 UTC8h 30m
2026-05-09 AFR6735 DUB → CDG May 9, 17:25 UTCMay 9, 18:40 UTC1h 15m
2026-05-09 AFR6735 DUB → CDG May 9, 08:05 UTCMay 9, 14:40 UTC6h 35m
2026-05-08 AFR6734 CDG → ORD May 8, 20:25 UTCMay 9, 04:40 UTC8h 15m
2026-05-08 AFR6733 ORD → CDG May 8, 14:35 UTCMay 8, 15:50 UTC1h 15m
2026-05-08 AFR6733 ORD → CDG May 8, 06:04 UTCMay 8, 12:34 UTC6h 30m
2026-05-07 AFR6732 CDG → ORD May 7, 18:40 UTCMay 8, 03:09 UTC8h 30m
2026-05-07 AFR6731 PIK → CDG May 7, 09:50 UTCMay 7, 15:15 UTC5h 25m
2026-05-07 AFR6731 PIK → CDG May 7, 07:55 UTCMay 7, 09:45 UTC1h 50m

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-GUOC page for operator, model, and routing details .

Mode-S 3951C2 frequently asked

What is Mode-S code 3951C2?
3951C2 is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-GUOC.
Where is Mode-S 3951C2 registered?
Mode-S code 3951C2 is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3951C2 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3951C2, octal 16250702, decimal 3,756,482.
What flights does 3951C2 operate?
Mode-S 3951C2 has broadcast 20 distinct callsigns, including AFR6733, AFR6727, AFR6732, AFR6735, AFR6726.