Apparatus

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sensors Mode-S transponder

3991E1

ICAO 24-bit transponder address · allocated to France

Currently assigned to F-HEPB · AIRBUS A-320

Hex
3991E1
Octal
16310741
Decimal
3,772,897
Country
FR
Tail
F-HEPB
Type
A320
No current signal · last broadcast 4d ago
Flights observed
111
Distinct callsigns
20
Country
FR
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S 3991E1.

Country allocation

The ICAO 24-bit address 3991E1 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
AFR99ZC Air France 3 2026-05-21
AFR81SL Air France 3 2026-05-21
AFR7339 Air France 3 2026-05-21
AFR52PM Air France 3 2026-05-07
AFR19QA - 3 2026-04-13
AFR1440 Air France 3 2026-05-21
AFR99MY Air France 2 2026-05-16
AFR84ZX Air France 2 2026-04-28
AFR78RT Air France 2 2026-05-16
AFR73PJ Air France 2 2026-04-28
AFR69MP Air France 2 2026-05-21
AFR62PQ Air France 2 2026-05-12
AFR61XC Air France 2 2026-05-07
AFR52EP Air France 2 2026-05-15
AFR47LQ Air France 2 2026-05-15
AFR45CR - 2 2026-05-16
AFR37EQ Air France 2 2026-05-16
AFR367V Air France 2 2026-05-26
AFR23EQ - 2 2026-05-21
AFR1855 Air France 2 2026-05-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-26 AFR367V YQX → CDG May 26, 11:54 UTCMay 26, 17:44 UTC5h 50m
2026-05-25 AFR367V YQX → CDG May 25, 15:25 UTCMay 26, 14:14 UTC22h 49m
2026-05-25 AFR366V CDG → TLS May 25, 11:15 UTCMay 25, 14:25 UTC3h 10m
2026-05-21 AFR99ZC AMS → CDG May 21, 19:10 UTCMay 21, 19:55 UTC45m
2026-05-21 AFR1440 CDG → AMS May 21, 16:55 UTCMay 21, 17:40 UTC45m
2026-05-21 AFR7339 MRS → CDG May 21, 14:10 UTCMay 21, 15:20 UTC1h 10m
2026-05-21 AFR81SL CDG → MRS May 21, 12:05 UTCMay 21, 13:10 UTC1h 5m
2026-05-21 AFR69MP VCE → CDG May 21, 08:45 UTCMay 21, 10:15 UTC1h 30m
2026-05-21 AFR23EQ - May 21, 05:10 UTCMay 21, 06:15 UTC1h 5m
2026-05-20 AFR66JB NTE → CDG May 20, 18:50 UTCMay 20, 19:35 UTC45m
2026-05-20 AFR57SY CDG → NTE May 20, 17:10 UTCMay 20, 17:50 UTC40m
2026-05-20 AFR14BM TLS → CDG May 20, 14:15 UTCMay 20, 15:25 UTC1h 10m
2026-05-20 AFR7412 CDG → TLS May 20, 12:25 UTCMay 20, 13:20 UTC55m
2026-05-20 AFR45XT LYS → CDG May 20, 09:40 UTCMay 20, 10:30 UTC50m
2026-05-20 AFR89VR FCO → CDG May 20, 07:40 UTCMay 20, 08:30 UTC50m
2026-05-20 AFR39TV MAD → CDG May 20, 04:25 UTCMay 20, 06:10 UTC1h 46m
2026-05-19 AFR62AP CDG → MAD May 19, 19:15 UTCMay 19, 20:50 UTC1h 35m
2026-05-19 AFR28WV BRI → CDG May 19, 15:40 UTCMay 19, 17:50 UTC2h 10m
2026-05-19 AFR43RA CDG → BRI May 19, 12:35 UTCMay 19, 14:35 UTC2h 0m
2026-05-19 AFR11NQ BOD → CDG May 19, 10:05 UTCMay 19, 10:55 UTC50m
2026-05-19 AFR45LB CDG → BOD May 19, 08:05 UTCMay 19, 09:05 UTC1h 0m
2026-05-19 AFR7323 NCE → CDG May 19, 05:15 UTCMay 19, 06:30 UTC1h 15m
2026-05-18 AFR13DT CDG → NCE May 18, 20:15 UTCMay 18, 21:15 UTC1h 0m
2026-05-18 AFR33EP BCN → CDG May 18, 16:30 UTCMay 18, 18:05 UTC1h 35m
2026-05-18 AFR63TJ CDG → BCN May 18, 13:40 UTCMay 18, 14:55 UTC1h 15m
2026-05-18 AFR47XB MRS → CDG May 18, 11:05 UTCMay 18, 12:20 UTC1h 15m
2026-05-18 AFR65JY CDG → MRS May 18, 08:50 UTCMay 18, 09:55 UTC1h 5m
2026-05-18 AFR18LZ LIS → CDG May 18, 05:00 UTCMay 18, 07:10 UTC2h 10m
2026-05-17 AFR64PQ CDG → LIS May 17, 19:10 UTCMay 17, 21:10 UTC2h 0m
2026-05-17 AFR31LY HAM → CDG May 17, 16:25 UTCMay 17, 17:35 UTC1h 10m
2026-05-17 AFR31UA CDG → BCN May 17, 13:55 UTCMay 17, 15:01 UTC1h 5m
2026-05-17 AFR44XC VIE → CDG May 17, 10:35 UTCMay 17, 12:05 UTC1h 30m
2026-05-17 AFR79NB CDG → VIE May 17, 07:30 UTCMay 17, 09:05 UTC1h 35m
2026-05-17 AFR15NA MRS → CDG May 17, 04:25 UTCMay 17, 05:35 UTC1h 10m
2026-05-16 AFR18DQ CDG → MRS May 16, 18:55 UTCMay 16, 20:00 UTC1h 5m
2026-05-16 AFR99MY LIS → CDG May 16, 15:35 UTCMay 16, 17:30 UTC1h 55m
2026-05-16 AFR37EQ CDG → LIS May 16, 12:05 UTCMay 16, 14:20 UTC2h 15m
2026-05-16 AFR45CR LYS → CDG May 16, 08:36 UTCMay 16, 09:25 UTC50m
2026-05-16 AFR78RT CDG → LYS May 16, 06:50 UTCMay 16, 07:31 UTC40m
2026-05-16 AFR1391 IST → CDG May 16, 02:00 UTCMay 16, 05:05 UTC3h 5m
2026-05-15 AFR1390 CDG → IST May 15, 21:05 UTCMay 15, 23:45 UTC2h 40m
2026-05-15 AFR18NL RAK → CDG May 15, 10:50 UTCMay 15, 18:25 UTC7h 34m
2026-05-15 AFR47LQ MRS → CDG May 15, 07:40 UTCMay 15, 08:50 UTC1h 10m
2026-05-15 AFR52EP CDG → MRS May 15, 05:35 UTCMay 15, 06:35 UTC1h 0m
2026-05-14 AFR36FH NCE → CDG May 14, 18:45 UTCMay 14, 19:50 UTC1h 5m
2026-05-14 AFR86LP CDG → HAM May 14, 16:30 UTCMay 14, 17:35 UTC1h 5m
2026-05-14 AFR7339 MRS → CDG May 14, 13:20 UTCMay 14, 14:25 UTC1h 5m
2026-05-14 AFR81SL CDG → MRS May 14, 11:05 UTCMay 14, 12:05 UTC1h 0m
2026-05-14 AFR1497 CMN → CDG May 14, 06:55 UTCMay 14, 09:25 UTC2h 30m
2026-05-13 AFR1496 CDG → CMN May 13, 17:15 UTCMay 13, 20:00 UTC2h 45m

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

Mode-S 3991E1 frequently asked

What is Mode-S code 3991E1?
3991E1 is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-HEPB.
Where is Mode-S 3991E1 registered?
Mode-S code 3991E1 is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3991E1 broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3991E1, octal 16310741, decimal 3,772,897.
What flights does 3991E1 operate?
Mode-S 3991E1 has broadcast 20 distinct callsigns, including AFR99ZC, AFR81SL, AFR7339, AFR52PM, AFR19QA.