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sensors Mode-S transponder

3991E2

ICAO 24-bit transponder address · allocated to France

Currently assigned to F-HEPC · AIRBUS A-320

Hex
3991E2
Octal
16310742
Decimal
3,772,898
Country
FR
Tail
F-HEPC
Type
A320
No current signal · last broadcast Jul 26, 20:40 UTC
Flights observed
102
Distinct callsigns
10
Country
FR
Last broadcast
Jul 26, 20:40 UTC

Last known position

Most recent position reported by Mode-S 3991E2.

Country allocation

The ICAO 24-bit address 3991E2 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 10 distinct

Callsign Airline Flights Last seen
AFR616 Air France 20 2026-07-25
AFR617 Air France 18 2026-07-26
AFR601 Air France 16 2026-07-25
AFR608 - 9 2026-07-20
AFR609 - 8 2026-07-14
AFR604 Air France 8 2026-07-26
AFR600 Air France 8 2026-07-24
AFR607 Air France 6 2026-07-24
AFR605 - 6 2026-07-19
AFR611 Air France 3 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AFR604 FDF → CAY Jul 26, 20:10 UTCJul 26, 20:40 UTC30m
2026-07-26 AFR617 MIA → PTP Jul 26, 14:15 UTCJul 26, 16:40 UTC2h 25m
2026-07-25 AFR616 PTP → MIA Jul 25, 21:20 UTCJul 25, 23:40 UTC2h 20m
2026-07-25 AFR601 FDF → PTP Jul 25, 18:50 UTCJul 25, 19:00 UTC10m
2026-07-25 AFR601 FDF → PTP Jul 25, 17:15 UTCJul 25, 17:50 UTC35m
2026-07-24 AFR600 FDF → CAY Jul 24, 17:15 UTCJul 24, 17:45 UTC30m
2026-07-24 AFR607 FDF → PTP Jul 24, 02:35 UTCJul 24, 02:40 UTC5m
2026-07-23 AFR604 FDF → CAY Jul 23, 20:45 UTCJul 24, 01:40 UTC4h 55m
2026-07-23 AFR617 - Jul 23, 14:05 UTCJul 23, 16:40 UTC2h 35m
2026-07-22 AFR616 PTP → MIA Jul 22, 21:10 UTCJul 22, 23:30 UTC2h 20m
2026-07-22 AFR611 PTP → FDF Jul 22, 01:35 UTCJul 22, 01:45 UTC10m
2026-07-21 AFR611 PTP → FDF Jul 21, 18:25 UTCJul 22, 00:50 UTC6h 25m
2026-07-20 AFR608 - Jul 20, 12:55 UTCJul 20, 18:30 UTC5h 35m
2026-07-19 AFR605 - Jul 19, 20:05 UTCJul 20, 00:45 UTC4h 40m
2026-07-19 AFR617 - Jul 19, 14:30 UTCJul 19, 16:50 UTC2h 20m
2026-07-18 AFR616 PTP → MIA Jul 18, 21:30 UTCJul 19, 00:00 UTC2h 30m
2026-07-18 AFR601 - Jul 18, 17:05 UTCJul 18, 17:25 UTC20m
2026-07-17 AFR600 FDF → CAY Jul 17, 16:49 UTCJul 17, 17:09 UTC20m
2026-07-16 AFR604 - Jul 16, 20:00 UTCJul 17, 00:45 UTC4h 45m
2026-07-16 AFR617 - Jul 16, 14:15 UTCJul 16, 14:40 UTC25m
2026-07-15 AFR616 - Jul 15, 21:15 UTCJul 15, 23:50 UTC2h 35m
2026-07-15 AFR601 - Jul 15, 12:45 UTCJul 15, 17:35 UTC4h 50m
2026-07-14 AFR609 - Jul 14, 18:20 UTCJul 15, 00:45 UTC6h 24m
2026-07-13 AFR608 - Jul 13, 12:55 UTCJul 13, 18:15 UTC5h 20m
2026-07-12 AFR605 - Jul 12, 20:15 UTCJul 13, 00:55 UTC4h 40m
2026-07-12 AFR617 - Jul 12, 14:20 UTCJul 12, 16:45 UTC2h 25m
2026-07-11 AFR616 - Jul 11, 21:25 UTCJul 11, 23:50 UTC2h 25m
2026-07-11 AFR601 - Jul 11, 17:10 UTCJul 11, 17:35 UTC25m
2026-07-10 AFR600 FDF → CAY Jul 10, 17:05 UTCJul 10, 17:30 UTC25m
2026-07-09 AFR617 - Jul 9, 14:05 UTCJul 10, 00:50 UTC10h 45m
2026-07-08 AFR616 - Jul 8, 21:15 UTCJul 8, 23:50 UTC2h 35m
2026-07-08 AFR601 - Jul 8, 12:35 UTCJul 8, 17:30 UTC4h 55m
2026-07-08 AFR611 - Jul 8, 00:30 UTCJul 8, 00:55 UTC25m
2026-07-07 AFR609 - Jul 7, 18:20 UTCJul 7, 18:30 UTC10m
2026-07-06 AFR600 FDF → CAY Jul 6, 12:30 UTCJul 6, 18:10 UTC5h 40m
2026-07-05 AFR604 - Jul 5, 20:40 UTCJul 6, 01:10 UTC4h 30m
2026-07-03 AFR605 - Jul 3, 19:55 UTCJul 4, 00:40 UTC4h 45m
2026-07-03 AFR617 - Jul 3, 14:05 UTCJul 3, 16:30 UTC2h 25m
2026-07-02 AFR616 - Jul 2, 21:30 UTCJul 3, 00:10 UTC2h 40m
2026-06-30 AFR609 - Jun 30, 18:40 UTCJun 30, 19:05 UTC25m
2026-06-29 AFR608 - Jun 29, 12:45 UTCJun 29, 18:19 UTC5h 35m
2026-06-28 AFR605 - Jun 28, 20:09 UTCJun 29, 01:00 UTC4h 50m
2026-06-28 AFR617 - Jun 28, 13:59 UTCJun 28, 16:29 UTC2h 30m
2026-06-27 AFR616 - Jun 27, 21:19 UTCJun 27, 23:55 UTC2h 35m
2026-06-23 AFR609 SXM → PTP Jun 23, 18:25 UTCJun 23, 18:45 UTC20m
2026-06-22 AFR608 PTP → SXM Jun 22, 17:50 UTCJun 22, 18:19 UTC30m
2026-06-21 AFR617 MIA → PTP Jun 21, 14:15 UTCJun 21, 16:34 UTC2h 20m
2026-06-20 AFR616 PTP → MIA Jun 20, 21:30 UTCJun 20, 23:59 UTC2h 30m
2026-06-16 AFR609 SXM → PTP Jun 16, 18:29 UTCJun 16, 18:50 UTC20m
2026-06-15 AFR608 PTP → SXM Jun 15, 17:59 UTCJun 15, 18:25 UTC25m

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

Mode-S 3991E2 frequently asked

What is Mode-S code 3991E2?
3991E2 is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-HEPC.
Where is Mode-S 3991E2 registered?
Mode-S code 3991E2 is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3991E2 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3991E2, octal 16310742, decimal 3,772,898.
What flights does 3991E2 operate?
Mode-S 3991E2 has broadcast 10 distinct callsigns, including AFR616, AFR617, AFR601, AFR608, AFR609.