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 8h ago
Flights observed
196
Distinct callsigns
20
Country
FR
Last broadcast
8h 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 - 29 2026-06-26
AFR6727 - 19 2026-07-12
AFR6735 Air France 16 2026-06-27
AFR6732 - 16 2026-06-25
AFR6726 - 13 2026-07-11
AFR6721 - 13 2026-07-13
AFR6720 - 11 2026-07-12
AFR6738 Air France 9 2026-06-23
AFR6722 - 9 2026-07-10
AFR6741 Air France 8 2026-06-08
AFR6739 Air France 8 2026-06-24
AFR6737 - 8 2026-06-28
AFR6736 - 8 2026-06-27
AFR6734 Air France 8 2026-06-26
AFR6740 Air France 7 2026-06-07
AFR6723 - 6 2026-07-11
AFR6728 - 3 2026-07-02
AFR6731 Air France 2 2026-05-07
AFR6729 - 2 2026-07-03
AFR6730 Air France 1 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 AFR6721 - Jul 13, 13:25 UTCJul 14, 04:05 UTC14h 40m
2026-07-12 AFR6720 - Jul 12, 21:10 UTCJul 13, 08:01 UTC10h 50m
2026-07-12 AFR6727 - Jul 12, 05:50 UTCJul 12, 14:45 UTC8h 55m
2026-07-11 AFR6726 - Jul 11, 16:35 UTCJul 12, 00:30 UTC7h 55m
2026-07-11 AFR6723 - Jul 11, 02:50 UTCJul 11, 13:00 UTC10h 10m
2026-07-10 AFR6722 - Jul 10, 12:35 UTCJul 10, 23:30 UTC10h 55m
2026-07-08 AFR6721 - Jul 8, 13:20 UTCJul 9, 03:30 UTC14h 10m
2026-07-07 AFR6720 - Jul 7, 21:30 UTCJul 8, 08:30 UTC11h 0m
2026-07-06 AFR6721 - Jul 6, 13:25 UTCJul 7, 03:40 UTC14h 15m
2026-07-05 AFR6720 - Jul 5, 21:35 UTCJul 6, 08:30 UTC10h 55m
2026-07-05 AFR6727 - Jul 5, 06:20 UTCJul 5, 15:30 UTC9h 10m
2026-07-04 AFR6726 - Jul 4, 16:20 UTCJul 5, 00:35 UTC8h 15m
2026-07-04 AFR6723 - Jul 4, 03:25 UTCJul 4, 13:35 UTC10h 10m
2026-07-03 AFR6722 - Jul 3, 12:55 UTCJul 3, 23:50 UTC10h 55m
2026-07-03 AFR6729 - Jul 3, 04:10 UTCJul 3, 09:05 UTC4h 55m
2026-07-02 AFR6728 - Jul 2, 17:30 UTCJul 2, 17:50 UTC20m
2026-07-02 AFR6728 - Jul 2, 07:30 UTCJul 2, 11:45 UTC4h 15m
2026-07-01 AFR6721 - Jul 1, 17:50 UTCJul 2, 03:35 UTC9h 45m
2026-07-01 AFR6721 - Jul 1, 13:25 UTCJul 1, 13:35 UTC10m
2026-06-30 AFR6720 - Jun 30, 21:25 UTCJul 1, 08:20 UTC10h 55m
2026-06-29 AFR6721 - Jun 29, 13:09 UTCJun 30, 03:10 UTC14h 1m
2026-06-28 AFR6720 - Jun 28, 21:40 UTCJun 29, 08:39 UTC11h 0m
2026-06-28 AFR6737 - Jun 28, 09:10 UTCJun 28, 16:29 UTC7h 20m
2026-06-27 AFR6736 - Jun 27, 22:04 UTCJun 28, 06:20 UTC8h 15m
2026-06-27 AFR6735 DUB → CDG Jun 27, 18:04 UTCJun 27, 19:24 UTC1h 20m
2026-06-27 AFR6735 DUB → CDG Jun 27, 08:25 UTCJun 27, 15:00 UTC6h 35m
2026-06-26 AFR6734 CDG → ORD Jun 26, 20:40 UTCJun 27, 04:49 UTC8h 10m
2026-06-26 AFR6733 - Jun 26, 16:39 UTCJun 26, 17:59 UTC1h 20m
2026-06-26 AFR6733 - Jun 26, 07:35 UTCJun 26, 14:25 UTC6h 50m
2026-06-25 AFR6732 - Jun 25, 20:09 UTCJun 26, 04:34 UTC8h 25m
2026-06-25 AFR6727 - Jun 25, 08:20 UTCJun 25, 17:14 UTC8h 55m
2026-06-24 AFR6726 - Jun 24, 18:29 UTCJun 25, 03:15 UTC8h 45m
2026-06-24 AFR6739 PIK → CDG Jun 24, 07:59 UTCJun 24, 15:14 UTC7h 15m
2026-06-23 AFR6738 CDG → ORD Jun 23, 20:19 UTCJun 24, 04:30 UTC8h 10m
2026-06-22 AFR6721 - Jun 22, 13:14 UTCJun 23, 04:05 UTC14h 50m
2026-06-21 AFR6720 - Jun 21, 21:34 UTCJun 22, 08:40 UTC11h 5m
2026-06-21 AFR6737 ORD → CDG Jun 21, 09:10 UTCJun 21, 16:30 UTC7h 20m
2026-06-20 AFR6736 CDG → ORD Jun 20, 21:30 UTCJun 21, 05:54 UTC8h 25m
2026-06-20 AFR6735 DUB → CDG Jun 20, 17:44 UTCJun 20, 18:54 UTC1h 10m
2026-06-20 AFR6735 DUB → CDG Jun 20, 08:14 UTCJun 20, 14:59 UTC6h 45m
2026-06-19 AFR6734 CDG → ORD Jun 19, 20:59 UTCJun 20, 05:14 UTC8h 15m
2026-06-19 AFR6733 ORD → CDG Jun 19, 17:29 UTCJun 19, 18:59 UTC1h 30m
2026-06-19 AFR6733 ORD → CDG Jun 19, 08:09 UTCJun 19, 15:09 UTC7h 0m
2026-06-18 AFR6732 CDG → ORD Jun 18, 21:05 UTCJun 19, 05:14 UTC8h 9m
2026-06-12 AFR6733 ORD → CDG Jun 12, 15:15 UTCJun 12, 16:30 UTC1h 15m
2026-06-12 AFR6733 ORD → CDG Jun 12, 07:00 UTCJun 12, 13:20 UTC6h 20m
2026-06-11 AFR6732 CDG → ORD Jun 11, 18:40 UTCJun 12, 03:20 UTC8h 41m
2026-06-10 AFR6721 GDL → CDG Jun 10, 13:10 UTCJun 11, 03:40 UTC14h 30m
2026-06-09 AFR6720 CDG → MEX Jun 9, 21:45 UTCJun 10, 08:45 UTC11h 0m
2026-06-09 AFR6733 ORD → CDG Jun 9, 15:15 UTCJun 9, 15:50 UTC35m

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 8h 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, AFR6735, AFR6732, AFR6726.