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 4h ago
Flights observed
204
Distinct callsigns
20
Country
RU
Last broadcast
4h 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 - 48 2026-07-10
AFL420 - 38 2026-07-10
AFL430 - 17 2026-06-27
AFL431 Aeroflot Russian Airlines 13 2026-06-24
AFL463 - 7 2026-07-12
AFL433 Aeroflot Russian Airlines 7 2026-06-06
AFL1751 - 7 2026-07-07
AFL423 - 5 2026-07-14
AFL233 Aeroflot Russian Airlines 5 2026-04-25
AFL1644 Aeroflot Russian Airlines 5 2026-05-09
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
AFL460 - 2 2026-07-05
AFL422 - 2 2026-07-14
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 AFL423 - Jul 14, 11:35 UTCJul 15, 00:10 UTC12h 34m
2026-07-14 AFL422 - Jul 14, 06:00 UTCJul 14, 06:45 UTC45m
2026-07-13 AFL1753 - Jul 13, 07:20 UTCJul 13, 08:50 UTC1h 30m
2026-07-12 AFL463 - Jul 12, 13:30 UTCJul 12, 13:40 UTC10m
2026-07-12 AFL463 - Jul 12, 03:35 UTCJul 12, 11:35 UTC8h 0m
2026-07-11 AFL463 - Jul 11, 14:20 UTCJul 12, 11:35 UTC21h 15m
2026-07-11 AFL463 - Jul 11, 13:50 UTCJul 12, 11:35 UTC21h 45m
2026-07-11 AFL463 - Jul 11, 10:20 UTCJul 12, 09:55 UTC23h 35m
2026-07-10 AFL421 - Jul 10, 21:30 UTCJul 11, 15:10 UTC17h 40m
2026-07-10 AFL420 - Jul 10, 01:45 UTCJul 10, 18:55 UTC17h 10m
2026-07-09 AFL463 - Jul 9, 10:20 UTCJul 10, 08:15 UTC21h 55m
2026-07-09 AFL463 - Jul 9, 09:35 UTCJul 10, 08:15 UTC22h 40m
2026-07-07 AFL1751 - Jul 7, 23:00 UTCJul 8, 09:55 UTC10h 55m
2026-07-07 AFL425 - Jul 7, 02:25 UTCJul 7, 23:25 UTC21h 0m
2026-07-06 AFL424 SVO → SVO Jul 6, 21:55 UTCJul 6, 22:45 UTC50m
2026-07-06 AFL427 - Jul 6, 12:25 UTCJul 6, 15:05 UTC2h 40m
2026-07-05 AFL461 - Jul 5, 21:10 UTCJul 6, 10:10 UTC13h 0m
2026-07-05 AFL460 - Jul 5, 15:50 UTCJul 5, 18:25 UTC2h 35m
2026-07-05 AFL460 - Jul 5, 12:45 UTCJul 5, 13:25 UTC40m
2026-07-04 AFL423 - Jul 4, 13:45 UTCJul 5, 06:30 UTC16h 45m
2026-07-03 AFL421 - Jul 3, 21:20 UTCJul 4, 11:10 UTC13h 50m
2026-07-03 AFL462 - Jul 3, 01:30 UTCJul 3, 19:00 UTC17h 30m
2026-07-02 AFL423 - Jul 2, 14:05 UTCJul 3, 07:10 UTC17h 5m
2026-07-02 AFL423 - Jul 2, 10:20 UTCJul 3, 07:10 UTC20h 50m
2026-07-02 AFL423 - Jul 2, 08:20 UTCJul 3, 07:10 UTC22h 50m
2026-07-02 AFL422 - Jul 2, 07:30 UTCJul 3, 06:15 UTC22h 45m
2026-07-01 AFL1300 SVO → MRV Jul 1, 14:20 UTCJul 1, 14:40 UTC20m
2026-07-01 AFL1751 - Jul 1, 00:15 UTCJul 1, 11:25 UTC11h 10m
2026-06-30 AFL1751 - Jun 30, 10:20 UTCJul 1, 10:15 UTC23h 55m
2026-06-30 AFL1751 - Jun 30, 09:10 UTCJul 1, 00:20 UTC15h 10m
2026-06-29 AFL1751 - Jun 29, 22:19 UTCJun 30, 10:30 UTC12h 11m
2026-06-29 AFL1751 - Jun 29, 10:29 UTCJun 30, 10:15 UTC23h 45m
2026-06-29 AFL1751 - Jun 29, 09:44 UTCJun 29, 23:25 UTC13h 40m
2026-06-28 AFL1015 - Jun 28, 08:59 UTCJun 28, 10:15 UTC1h 15m
2026-06-27 AFL430 - Jun 27, 13:35 UTCJun 28, 07:14 UTC17h 40m
2026-06-26 AFL430 - Jun 26, 18:20 UTCJun 27, 18:15 UTC23h 55m
2026-06-26 AFL430 - Jun 26, 18:04 UTCJun 27, 15:39 UTC21h 35m
2026-06-25 AFL420 - Jun 25, 20:19 UTCJun 26, 15:25 UTC19h 5m
2026-06-25 AFL421 - Jun 25, 18:19 UTCJun 26, 15:25 UTC21h 5m
2026-06-25 AFL421 - Jun 25, 17:34 UTCJun 26, 15:25 UTC21h 50m
2026-06-25 AFL421 - Jun 25, 14:20 UTCJun 26, 14:15 UTC23h 55m
2026-06-25 AFL421 - Jun 25, 13:50 UTCJun 25, 20:30 UTC6h 40m
2026-06-24 AFL420 - Jun 24, 18:20 UTCJun 25, 18:15 UTC23h 55m
2026-06-24 AFL431 SSH → SVO Jun 24, 17:59 UTCJun 25, 15:20 UTC21h 20m
2026-06-24 AFL430 - Jun 24, 13:30 UTCJun 24, 15:09 UTC1h 40m
2026-06-24 AFL430 SVO → SVO Jun 24, 09:45 UTCJun 24, 10:10 UTC25m
2026-06-23 AFL421 - Jun 23, 13:39 UTCJun 23, 20:54 UTC7h 15m
2026-06-23 AFL420 SVO → SVO Jun 23, 09:49 UTCJun 23, 10:19 UTC30m
2026-06-22 AFL421 - Jun 22, 14:10 UTCJun 22, 21:14 UTC7h 5m
2026-06-22 AFL420 SVO → HRG Jun 22, 10:10 UTCJun 22, 10:30 UTC20m

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 4h 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, AFL430, AFL431, AFL463.