Apparatus

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sensors Mode-S transponder

151FEF

ICAO 24-bit transponder address · allocated to Russia

Currently assigned to RA-73711 · AIRBUS A-321

Hex
151FEF
Octal
05217757
Decimal
1,384,431
Country
RU
Tail
RA-73711
Type
A321
No current signal · last broadcast Jul 26, 08:40 UTC
Flights observed
223
Distinct callsigns
20
Country
RU
Last broadcast
Jul 26, 08:40 UTC

Last known position

Most recent position reported by Mode-S 151FEF.

Country allocation

The ICAO 24-bit address 151FEF 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
AFL2142 - 12 2026-07-18
AFL1861 - 9 2026-07-17
AFL2143 - 8 2026-07-18
AFL2146 Aeroflot Russian Airlines 7 2026-07-25
AFL615 - 6 2026-07-17
AFL2147 Aeroflot Russian Airlines 6 2026-07-25
AFL1008 Aeroflot Russian Airlines 6 2026-05-22
AFL2170 - 5 2026-07-20
AFL2145 Aeroflot Russian Airlines 5 2026-06-24
AFL2134 Aeroflot Russian Airlines 5 2026-06-10
AFL1009 Aeroflot Russian Airlines 5 2026-05-23
AFL2144 Aeroflot Russian Airlines 4 2026-06-24
AFL1451 - 4 2026-07-21
AFL1019 Aeroflot Russian Airlines 4 2026-04-30
AFL1018 Aeroflot Russian Airlines 4 2026-05-25
AFL1947 Aeroflot Russian Airlines 3 2026-05-24
AFL1891 Aeroflot Russian Airlines 3 2026-05-30
AFL1886 - 3 2026-07-19
AFL1882 Aeroflot Russian Airlines 3 2026-06-18
AFL1867 Aeroflot Russian Airlines 3 2026-06-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AFL1583 RGK → SVO Jul 26, 08:30 UTCJul 26, 08:40 UTC10m
2026-07-25 AFL1582 SVO → RGK Jul 25, 23:15 UTCJul 25, 23:25 UTC10m
2026-07-25 AFL2147 AYT → SVO Jul 25, 15:55 UTCJul 25, 17:35 UTC1h 40m
2026-07-25 AFL2146 SVO → AYT Jul 25, 01:20 UTCJul 25, 14:20 UTC13h 0m
2026-07-24 AFL2132 SVO → IST Jul 24, 23:00 UTCJul 24, 23:15 UTC15m
2026-07-22 AFL1006 SVO → KGD Jul 22, 17:30 UTCJul 22, 18:20 UTC50m
2026-07-22 AFL1154 SVO → GDZ Jul 22, 03:55 UTCJul 22, 04:50 UTC55m
2026-07-22 AFL1851 GYD → SVO Jul 22, 01:40 UTCJul 22, 02:05 UTC25m
2026-07-21 AFL1850 - Jul 21, 19:25 UTCJul 21, 19:35 UTC10m
2026-07-21 AFL1451 - Jul 21, 01:45 UTCJul 21, 02:05 UTC20m
2026-07-20 AFL1025 - Jul 20, 13:10 UTCJul 21, 00:20 UTC11h 9m
2026-07-20 AFL1025 - Jul 20, 05:05 UTCJul 21, 00:20 UTC19h 14m
2026-07-20 AFL2170 - Jul 20, 02:40 UTCJul 20, 03:00 UTC20m
2026-07-20 AFL2170 - Jul 20, 01:15 UTCJul 20, 02:05 UTC50m
2026-07-19 AFL2170 - Jul 19, 23:05 UTCJul 19, 23:35 UTC30m
2026-07-19 AFL1886 - Jul 19, 07:00 UTCJul 19, 07:20 UTC20m
2026-07-19 AFL1886 SVO → SVO Jul 19, 06:50 UTCJul 19, 06:55 UTC5m
2026-07-18 AFL2143 - Jul 18, 11:25 UTCJul 18, 13:00 UTC1h 35m
2026-07-18 AFL2142 - Jul 18, 08:20 UTCJul 18, 09:50 UTC1h 30m
2026-07-17 AFL1861 - Jul 17, 19:15 UTCJul 17, 19:40 UTC25m
2026-07-17 AFL1861 - Jul 17, 16:29 UTCJul 17, 16:59 UTC30m
2026-07-17 AFL615 - Jul 17, 10:15 UTCJul 17, 11:20 UTC1h 5m
2026-07-16 AFL1769 PEE → SVO Jul 16, 15:55 UTCJul 17, 08:25 UTC16h 30m
2026-07-16 AFL1831 - Jul 16, 08:55 UTCJul 16, 09:15 UTC20m
2026-07-15 AFL1865 - Jul 15, 18:50 UTCJul 15, 19:20 UTC30m
2026-07-15 AFL1864 SVO → SVO Jul 15, 14:05 UTCJul 15, 14:35 UTC30m
2026-07-15 AFL2171 - Jul 15, 05:20 UTCJul 15, 05:55 UTC35m
2026-07-15 AFL2170 - Jul 15, 03:25 UTCJul 15, 03:40 UTC15m
2026-07-14 AFL2170 SVO → SVO Jul 14, 23:10 UTCJul 14, 23:25 UTC15m
2026-07-14 AFL1415 - Jul 14, 16:20 UTCJul 14, 19:35 UTC3h 15m
2026-07-13 AFL1321 - Jul 13, 10:55 UTCJul 13, 11:15 UTC20m
2026-07-13 AFL1320 SVO → SVO Jul 13, 06:40 UTCJul 13, 06:55 UTC15m
2026-07-11 AFL2147 AYT → SVO Jul 11, 16:10 UTCJul 11, 17:30 UTC1h 20m
2026-07-11 AFL2147 AYT → SVO Jul 11, 15:45 UTCJul 11, 16:05 UTC20m
2026-07-11 AFL2146 - Jul 11, 14:00 UTCJul 11, 14:25 UTC25m
2026-07-11 AFK2146 SVO → SVO Jul 11, 09:35 UTCJul 11, 10:10 UTC35m
2026-07-08 AFL1010 - Jul 8, 15:40 UTCJul 8, 16:35 UTC55m
2026-07-06 AFL1861 - Jul 6, 17:55 UTCJul 6, 18:20 UTC25m
2026-07-06 AFL615 - Jul 6, 10:10 UTCJul 6, 11:00 UTC50m
2026-07-05 AFL1869 - Jul 5, 21:10 UTCJul 5, 21:40 UTC30m
2026-07-05 AFL1868 - Jul 5, 16:20 UTCJul 5, 19:15 UTC2h 55m
2026-07-04 AFL1865 - Jul 4, 21:20 UTCJul 4, 21:50 UTC30m
2026-07-04 AFL1044 - Jul 4, 09:20 UTCJul 4, 09:50 UTC30m
2026-07-04 AFL1044 - Jul 4, 06:40 UTCJul 4, 07:05 UTC25m
2026-07-03 AFL2143 - Jul 3, 11:10 UTCJul 3, 13:00 UTC1h 50m
2026-07-02 AFL1070 SVO → AER Jul 2, 14:05 UTCJul 2, 14:20 UTC15m
2026-07-01 AFL1236 SVO → SVO Jul 1, 19:20 UTCJul 1, 19:35 UTC15m
2026-06-30 AFL1513 - Jun 30, 04:40 UTCJun 30, 05:05 UTC25m
2026-06-29 AFL1512 SVO → SVO Jun 29, 23:09 UTCJun 29, 23:19 UTC10m
2026-06-29 AFL2147 AYT → SVO Jun 29, 17:10 UTCJun 29, 19:00 UTC1h 50m

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-73711 page for operator, model, and routing details .

Mode-S 151FEF frequently asked

What is Mode-S code 151FEF?
151FEF is an ICAO 24-bit transponder address. Allocated to Russia. Assigned to RA-73711.
Where is Mode-S 151FEF registered?
Mode-S code 151FEF is allocated to Russia (RU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 151FEF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 08:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 151FEF, octal 05217757, decimal 1,384,431.
What flights does 151FEF operate?
Mode-S 151FEF has broadcast 20 distinct callsigns, including AFL2142, AFL1861, AFL2143, AFL2146, AFL615.