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 1d ago
Flights observed
193
Distinct callsigns
20
Country
RU
Last broadcast
1d ago

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 - 11 2026-06-12
AFL2143 - 7 2026-07-03
AFL1861 - 7 2026-07-06
AFL2146 - 6 2026-07-11
AFL1008 Aeroflot Russian Airlines 6 2026-05-22
AFL615 - 5 2026-07-06
AFL2147 Aeroflot Russian Airlines 5 2026-07-11
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
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
AFL1882 Aeroflot Russian Airlines 3 2026-06-18
AFL1867 Aeroflot Russian Airlines 3 2026-06-07
AFL1481 Aeroflot Russian Airlines 3 2026-05-10
AFL1451 Aeroflot Russian Airlines 3 2026-04-16
AFL1044 - 3 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-06-29 AFL2146 - Jun 29, 02:45 UTCJun 29, 15:30 UTC12h 45m
2026-06-28 AFL1863 - Jun 28, 17:00 UTCJun 28, 17:30 UTC30m
2026-06-26 AFL2147 AYT → SVO Jun 26, 15:10 UTCJun 27, 07:55 UTC16h 45m
2026-06-26 AFL2146 - Jun 26, 12:59 UTCJun 26, 13:24 UTC25m
2026-06-25 AFL2146 - Jun 25, 14:39 UTCJun 26, 13:24 UTC22h 45m
2026-06-25 AFL2137 IST → SVO Jun 25, 13:09 UTCJun 25, 14:55 UTC1h 45m
2026-06-25 AFL2136 - Jun 25, 10:04 UTCJun 25, 10:39 UTC35m
2026-06-24 AFL2145 AYT → SVO Jun 24, 17:20 UTCJun 24, 19:15 UTC1h 55m
2026-06-24 AFL2144 SVO → AYT Jun 24, 11:09 UTCJun 24, 15:49 UTC4h 40m
2026-06-24 AFL2171 - Jun 24, 04:50 UTCJun 24, 05:20 UTC30m
2026-06-23 AFL1011 - Jun 23, 18:14 UTCJun 24, 03:04 UTC8h 50m
2026-06-23 AFL1003 - Jun 23, 10:49 UTCJun 23, 16:44 UTC5h 55m
2026-06-22 AFL1025 KGD → SVO Jun 22, 15:24 UTCJun 23, 09:29 UTC18h 5m
2026-06-22 AFL1024 SVO → KGD Jun 22, 11:44 UTCJun 22, 13:49 UTC2h 5m
2026-06-22 AFL1503 - Jun 22, 07:30 UTCJun 22, 07:49 UTC20m
2026-06-21 AFL1110 SVO → AER Jun 21, 02:24 UTCJun 21, 03:05 UTC40m
2026-06-20 AFL2145 AYT → SVO Jun 20, 17:24 UTCJun 20, 19:04 UTC1h 40m
2026-06-19 AFL1044 SVO → AER Jun 19, 06:44 UTCJun 19, 07:14 UTC30m
2026-06-18 AFL1882 SVO → FRU Jun 18, 18:50 UTCJun 18, 19:25 UTC35m
2026-06-18 AFL1383 - Jun 18, 14:25 UTCJun 18, 15:05 UTC40m
2026-06-17 AFL1382 SVO → SVO Jun 17, 22:45 UTCJun 17, 23:10 UTC25m
2026-06-17 AFL1011 - Jun 17, 19:00 UTCJun 17, 20:20 UTC1h 20m
2026-06-17 AFL1003 KGD → SVO Jun 17, 11:25 UTCJun 17, 17:10 UTC5h 45m
2026-06-17 AFL1002 - Jun 17, 08:55 UTCJun 17, 09:45 UTC50m
2026-06-15 AFL1882 SVO → FRU Jun 15, 19:30 UTCJun 15, 20:34 UTC1h 5m
2026-06-14 AFL2169 DLM → SVO Jun 14, 21:50 UTCJun 15, 08:35 UTC10h 44m
2026-06-14 AFL2168 SVO → DLM Jun 14, 19:25 UTCJun 14, 19:50 UTC25m
2026-06-12 AFL2143 AYT → SVO Jun 12, 11:25 UTCJun 12, 13:25 UTC2h 0m
2026-06-12 AFL2142 - Jun 12, 08:15 UTCJun 12, 09:50 UTC1h 35m
2026-06-12 AFL2142 SVO → SVO Jun 12, 05:30 UTCJun 12, 06:00 UTC30m

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 1d ago.
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, AFL2143, AFL1861, AFL2146, AFL1008.