Apparatus

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sensors Mode-S transponder

3951E4

ICAO 24-bit transponder address · allocated to France

Currently assigned to F-GUPE · BEECH 1900

Hex
3951E4
Octal
16250744
Decimal
3,756,516
Country
FR
Tail
F-GUPE
Type
B190
No current signal · last broadcast Jul 24, 17:55 UTC
Flights observed
139
Distinct callsigns
18
Country
FR
Last broadcast
Jul 24, 17:55 UTC

Last known position

Most recent position reported by Mode-S 3951E4.

Country allocation

The ICAO 24-bit address 3951E4 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 18 distinct

Callsign Airline Flights Last seen
TJT81MK Twin Jet 39 2026-07-23
TJT88XP - 37 2026-07-24
TJT82XP Twin Jet 24 2026-07-20
TJT87MK - 22 2026-07-24
TJT95SZ - 2 2026-07-16
TJT777C - 2 2026-07-14
TJT098Q - 2 2026-07-11
TJT96VP Twin Jet 1 2026-06-12
TJT78NL Twin Jet 1 2026-06-11
TJT77JD Twin Jet 1 2026-06-11
TJT6616 Twin Jet 1 2026-06-12
TJT6615 Twin Jet 1 2026-06-12
TJT58CB - 1 2026-07-16
TJT57AL Twin Jet 1 2026-06-12
TJT1512 - 1 2026-07-15
TJT1511 - 1 2026-07-15
TJT051P - 1 2026-07-17
TJT040P - 1 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 TJT88XP - Jul 24, 17:00 UTCJul 24, 17:55 UTC55m
2026-07-24 TJT87MK - Jul 24, 15:10 UTCJul 24, 16:15 UTC1h 5m
2026-07-23 TJT88XP - Jul 23, 17:00 UTCJul 23, 17:45 UTC45m
2026-07-23 TJT81MK LPY → ORY Jul 23, 05:10 UTCJul 23, 06:15 UTC1h 5m
2026-07-22 TJT88XP - Jul 22, 17:00 UTCJul 22, 17:50 UTC50m
2026-07-22 TJT81MK - Jul 22, 05:00 UTCJul 22, 05:25 UTC25m
2026-07-21 TJT88XP - Jul 21, 17:05 UTCJul 21, 17:55 UTC50m
2026-07-21 TJT81MK - Jul 21, 04:55 UTCJul 21, 06:00 UTC1h 5m
2026-07-20 TJT82XP ORY → LPY Jul 20, 06:50 UTCJul 20, 07:45 UTC55m
2026-07-20 TJT81MK - Jul 20, 05:00 UTCJul 20, 06:10 UTC1h 10m
2026-07-17 TJT88XP - Jul 17, 17:05 UTCJul 17, 18:00 UTC55m
2026-07-17 TJT87MK - Jul 17, 15:05 UTCJul 17, 16:10 UTC1h 5m
2026-07-17 TJT051P - Jul 17, 13:45 UTCJul 17, 14:10 UTC25m
2026-07-16 TJT58CB - Jul 16, 18:50 UTCJul 16, 19:40 UTC50m
2026-07-16 TJT95SZ - Jul 16, 17:10 UTCJul 16, 18:05 UTC55m
2026-07-15 TJT1512 TLS → MRS Jul 15, 06:45 UTCJul 15, 07:35 UTC50m
2026-07-15 TJT1511 - Jul 15, 05:15 UTCJul 15, 06:05 UTC50m
2026-07-14 TJT777C - Jul 14, 01:20 UTCJul 14, 04:20 UTC3h 0m
2026-07-12 TJT777C - Jul 12, 01:25 UTCJul 12, 04:15 UTC2h 50m
2026-07-11 TJT098Q - Jul 11, 08:10 UTCJul 11, 08:30 UTC20m
2026-07-02 TJT040P - Jul 2, 11:20 UTCJul 2, 12:20 UTC1h 0m
2026-06-29 TJT95SZ MRS → MXP Jun 29, 17:40 UTCJun 29, 18:49 UTC1h 10m
2026-06-29 TJT098Q - Jun 29, 16:00 UTCJun 29, 16:10 UTC10m
2026-06-12 TJT96VP MXP → MRS Jun 12, 18:20 UTCJun 12, 19:30 UTC1h 10m
2026-06-12 TJT57AL LYS → MXP Jun 12, 16:30 UTCJun 12, 17:30 UTC1h 0m
2026-06-12 TJT6616 BLQ → LYS Jun 12, 14:25 UTCJun 12, 15:40 UTC1h 15m
2026-06-12 TJT6615 LYS → BLQ Jun 12, 12:00 UTCJun 12, 13:10 UTC1h 10m
2026-06-11 TJT78NL PUF → LYS Jun 11, 16:40 UTCJun 11, 17:55 UTC1h 15m
2026-06-11 TJT77JD LYS → PUF Jun 11, 14:55 UTCJun 11, 16:05 UTC1h 10m
2026-06-11 TJT82XP ORY → LPY Jun 11, 07:00 UTCJun 11, 08:30 UTC1h 30m
2026-06-11 TJT81MK LPY → ORY Jun 11, 05:00 UTCJun 11, 06:10 UTC1h 10m
2026-06-10 TJT88XP ORY → LPY Jun 10, 16:55 UTCJun 10, 17:45 UTC50m
2026-06-10 TJT81MK LPY → ORY Jun 10, 05:05 UTCJun 10, 06:05 UTC1h 0m
2026-06-09 TJT88XP ORY → LPY Jun 9, 17:00 UTCJun 9, 17:50 UTC50m
2026-06-09 TJT81MK LPY → ORY Jun 9, 04:55 UTCJun 9, 06:00 UTC1h 5m
2026-06-08 TJT82XP ORY → LPY Jun 8, 06:50 UTCJun 8, 07:40 UTC50m
2026-06-08 TJT81MK LPY → ORY Jun 8, 05:00 UTCJun 8, 06:00 UTC1h 0m
2026-06-05 TJT88XP ORY → LPY Jun 5, 17:00 UTCJun 5, 17:55 UTC55m
2026-06-05 TJT87MK LPY → ORY Jun 5, 15:00 UTCJun 5, 16:00 UTC1h 0m
2026-06-04 TJT88XP ORY → LPY Jun 4, 17:05 UTCJun 4, 18:00 UTC55m
2026-06-04 TJT87MK LPY → ORY Jun 4, 15:10 UTCJun 4, 16:10 UTC1h 0m
2026-06-04 TJT82XP ORY → LPY Jun 4, 06:45 UTCJun 4, 07:45 UTC1h 0m
2026-06-04 TJT81MK LPY → ORY Jun 4, 04:55 UTCJun 4, 05:55 UTC1h 0m
2026-06-03 TJT88XP ORY → LPY Jun 3, 17:10 UTCJun 3, 18:00 UTC50m
2026-06-03 TJT87MK LPY → ORY Jun 3, 15:00 UTCJun 3, 16:05 UTC1h 5m
2026-06-03 TJT82XP ORY → LPY Jun 3, 06:45 UTCJun 3, 07:35 UTC50m
2026-06-03 TJT81MK LPY → ORY Jun 3, 04:55 UTCJun 3, 06:10 UTC1h 15m
2026-06-02 TJT88XP ORY → LPY Jun 2, 17:15 UTCJun 2, 18:10 UTC55m
2026-06-02 TJT87MK LPY → ORY Jun 2, 15:05 UTCJun 2, 16:10 UTC1h 5m
2026-06-02 TJT82XP ORY → LPY Jun 2, 06:45 UTCJun 2, 07:40 UTC55m

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

Mode-S 3951E4 frequently asked

What is Mode-S code 3951E4?
3951E4 is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-GUPE.
Where is Mode-S 3951E4 registered?
Mode-S code 3951E4 is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3951E4 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 17:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3951E4, octal 16250744, decimal 3,756,516.
What flights does 3951E4 operate?
Mode-S 3951E4 has broadcast 18 distinct callsigns, including TJT81MK, TJT88XP, TJT82XP, TJT87MK, TJT95SZ.