Apparatus

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sensors Mode-S transponder

151FE9

ICAO 24-bit transponder address · allocated to Russia

Currently assigned to RA-73705 · AIRBUS A-321neo

Hex
151FE9
Octal
05217751
Decimal
1,384,425
Country
RU
Tail
RA-73705
Type
A21N
No current signal · last broadcast 1h ago
Flights observed
115
Distinct callsigns
20
Country
RU
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 151FE9.

Country allocation

The ICAO 24-bit address 151FE9 falls within the block assigned to Russia (RU) by ICAO Annex 10, Volume III. Every aircraft registered in Russia 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
AFL421 Aeroflot Russian Airlines 35 2026-05-29
AFL420 Aeroflot Russian Airlines 25 2026-05-29
AFL233 Aeroflot Russian Airlines 5 2026-04-25
AFL1644 Aeroflot Russian Airlines 5 2026-05-09
AFL433 Aeroflot Russian Airlines 4 2026-05-16
AFL431 Aeroflot Russian Airlines 4 2026-05-30
AFL232 Aeroflot Russian Airlines 4 2026-04-24
AFL1645 Aeroflot Russian Airlines 4 2026-05-10
AFL1003 Aeroflot Russian Airlines 4 2026-05-01
AFL661 Aeroflot Russian Airlines 3 2026-05-09
AFL430 Aeroflot Russian Airlines 3 2026-05-30
AFL1883 Aeroflot Russian Airlines 2 2026-05-27
AFL1882 Aeroflot Russian Airlines 2 2026-05-26
AFL1024 Aeroflot Russian Airlines 2 2026-05-13
AFL1002 Aeroflot Russian Airlines 2 2026-04-15
AFL660 Aeroflot Russian Airlines 1 2026-04-18
AFL2143 Aeroflot Russian Airlines 1 2026-04-27
AFL1832 Aeroflot Russian Airlines 1 2026-05-17
AFL1318 Aeroflot Russian Airlines 1 2026-05-02
AFL1268 Aeroflot Russian Airlines 1 2026-05-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 AFL431 SSH → SVO May 30, 18:00 UTCMay 30, 19:25 UTC1h 25m
2026-05-30 AFL430 SVO → SSH May 30, 13:00 UTCMay 30, 15:30 UTC2h 30m
2026-05-30 AFL430 SVO → SSH May 30, 09:45 UTCMay 30, 10:15 UTC30m
2026-05-29 AFL421 HRG → SVO May 29, 22:55 UTCMay 29, 23:25 UTC30m
2026-05-29 AFL421 HRG → SVO May 29, 13:00 UTCMay 29, 21:10 UTC8h 10m
2026-05-29 AFL420 SVO → HRG May 29, 10:05 UTCMay 29, 10:30 UTC25m
2026-05-28 AFL431 SSH → SVO May 28, 14:00 UTCMay 28, 20:55 UTC6h 55m
2026-05-28 AFL430 SVO → SSH May 28, 09:40 UTCMay 28, 10:05 UTC25m
2026-05-27 AFL420 SVO → HRG May 27, 13:35 UTCMay 27, 21:10 UTC7h 35m
2026-05-27 AFL1883 FRU → SVO May 27, 03:54 UTCMay 27, 04:19 UTC25m
2026-05-26 AFL1882 SVO → FRU May 26, 18:55 UTCMay 26, 19:34 UTC40m
2026-05-25 AFL421 HRG → SVO May 25, 12:50 UTCMay 25, 20:59 UTC8h 9m
2026-05-25 AFL420 SVO → HRG May 25, 09:55 UTCMay 25, 10:25 UTC30m
2026-05-24 AFL421 HRG → SVO May 24, 12:45 UTCMay 24, 21:00 UTC8h 15m
2026-05-24 AFL420 SVO → HRG May 24, 09:50 UTCMay 24, 10:15 UTC25m
2026-05-22 AFL431 SSH → SVO May 22, 14:10 UTCMay 22, 21:00 UTC6h 50m
2026-05-21 AFL431 SSH → SVO May 21, 20:20 UTCMay 22, 20:15 UTC23h 55m
2026-05-21 AFL421 HRG → SVO May 21, 18:20 UTCMay 22, 18:15 UTC23h 55m
2026-05-21 AFL421 HRG → SVO May 21, 17:30 UTCMay 22, 15:35 UTC22h 5m
2026-05-21 AFL421 HRG → SVO May 21, 14:20 UTCMay 22, 14:15 UTC23h 55m
2026-05-21 AFL421 HRG → SVO May 21, 13:50 UTCMay 21, 20:40 UTC6h 50m
2026-05-20 AFL421 HRG → SVO May 20, 20:45 UTCMay 21, 20:15 UTC23h 30m
2026-05-20 AFL421 HRG → SVO May 20, 18:40 UTCMay 21, 18:15 UTC23h 35m
2026-05-20 AFL421 HRG → SVO May 20, 14:55 UTCMay 21, 14:15 UTC23h 20m
2026-05-19 AFL421 HRG → SVO May 19, 20:20 UTCMay 20, 20:05 UTC23h 46m
2026-05-19 AFL421 HRG → SVO May 19, 18:20 UTCMay 20, 16:10 UTC21h 51m
2026-05-19 AFL421 HRG → SVO May 19, 17:40 UTCMay 20, 16:10 UTC22h 31m
2026-05-19 AFL421 HRG → SVO May 19, 13:40 UTCMay 19, 21:05 UTC7h 25m
2026-05-18 AFL421 HRG → SVO May 18, 18:20 UTCMay 19, 18:15 UTC23h 54m
2026-05-18 AFL421 HRG → SVO May 18, 17:45 UTCMay 19, 15:05 UTC21h 19m
2026-05-18 AFL421 HRG → SVO May 18, 14:20 UTCMay 19, 14:15 UTC23h 54m
2026-05-18 AFL421 HRG → SVO May 18, 13:50 UTCMay 18, 21:20 UTC7h 29m
2026-05-17 AFL420 SVO → HRG May 17, 19:30 UTCMay 18, 18:15 UTC22h 45m
2026-05-17 AFL1832 SVO → MSQ May 17, 17:55 UTCMay 17, 18:05 UTC10m
2026-05-16 AFL433 HRG → SVO May 16, 02:50 UTCMay 16, 18:10 UTC15h 21m
2026-05-15 AFL1226 SVO → GOJ May 15, 12:45 UTCMay 16, 02:55 UTC14h 9m
2026-05-14 AFL421 HRG → SVO May 14, 13:01 UTCMay 14, 21:25 UTC8h 25m
2026-05-13 AFL420 SVO → HRG May 13, 18:20 UTCMay 14, 18:15 UTC23h 55m
2026-05-13 AFL420 SVO → HRG May 13, 17:10 UTCMay 14, 15:25 UTC22h 15m
2026-05-13 AFL1024 SVO → KGD May 13, 14:35 UTCMay 13, 15:30 UTC55m
2026-05-12 AFL1024 SVO → KGD May 12, 18:20 UTCMay 13, 15:30 UTC21h 10m
2026-05-12 AFL421 HRG → SVO May 12, 17:30 UTCMay 13, 15:30 UTC22h 0m
2026-05-12 AFL421 HRG → SVO May 12, 13:45 UTCMay 12, 18:55 UTC5h 10m
2026-05-11 AFL421 HRG → SVO May 11, 18:35 UTCMay 12, 18:15 UTC23h 40m
2026-05-11 AFL420 SVO → HRG May 11, 14:50 UTCMay 12, 14:15 UTC23h 26m
2026-05-11 AFL420 SVO → HRG May 11, 10:25 UTCMay 11, 19:45 UTC9h 20m
2026-05-10 AFL1645 IKT → SVO May 10, 17:40 UTCMay 10, 18:05 UTC25m
2026-05-09 AFL661 HKT → IKT May 9, 20:15 UTCMay 10, 10:40 UTC14h 25m
2026-05-09 AFL1644 SVO → IKT May 9, 15:40 UTCMay 9, 15:50 UTC10m
2026-05-09 AFL1268 SVO → KZN May 9, 05:15 UTCMay 9, 05:50 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 RA-73705 page for operator, model, and routing details .

Mode-S 151FE9 frequently asked

What is Mode-S code 151FE9?
151FE9 is an ICAO 24-bit transponder address. Allocated to Russia. Assigned to RA-73705.
Where is Mode-S 151FE9 registered?
Mode-S code 151FE9 is allocated to Russia (RU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 151FE9 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 151FE9, octal 05217751, decimal 1,384,425.
What flights does 151FE9 operate?
Mode-S 151FE9 has broadcast 20 distinct callsigns, including AFL421, AFL420, AFL233, AFL1644, AFL433.