Apparatus

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sensors Mode-S transponder

151FF9

ICAO 24-bit transponder address · allocated to Russia

Currently assigned to RA-73721 · AIRBUS A-321

Hex
151FF9
Octal
05217771
Decimal
1,384,441
Country
RU
Tail
RA-73721
Type
A321
Broadcasting now · callsign AFL1268 · 33,500 ft
Flights observed
108
Distinct callsigns
20
Country
RU
Last broadcast
14h ago

Current position

151FF9 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 151FF9 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 Aeroflot Russian Airlines 7 2026-05-22
AFL2143 Aeroflot Russian Airlines 5 2026-05-22
AFL1883 Aeroflot Russian Airlines 5 2026-05-17
AFL1261 Aeroflot Russian Airlines 4 2026-05-20
AFL1868 Aeroflot Russian Airlines 3 2026-05-20
AFL1530 Aeroflot Russian Airlines 3 2026-05-17
AFL1017 Aeroflot Russian Airlines 3 2026-05-10
AFL1011 Aeroflot Russian Airlines 3 2026-04-26
AFL615 Aeroflot Russian Airlines 2 2026-04-29
AFL614 Aeroflot Russian Airlines 2 2026-04-29
AFL1869 Aeroflot Russian Airlines 2 2026-05-20
AFL1861 Aeroflot Russian Airlines 2 2026-04-29
AFL1833 Aeroflot Russian Airlines 2 2026-05-29
AFL1762 Aeroflot Russian Airlines 2 2026-05-05
AFL1483 Aeroflot Russian Airlines 2 2026-04-21
AFL1451 Aeroflot Russian Airlines 2 2026-04-17
AFL1450 Aeroflot Russian Airlines 2 2026-04-16
AFL1124 Aeroflot Russian Airlines 2 2026-05-27
AFL1093 Aeroflot Russian Airlines 2 2026-05-03
AFL1028 Aeroflot Russian Airlines 2 2026-05-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 AFL1833 MSQ → SVO May 29, 18:15 UTCMay 29, 18:30 UTC15m
2026-05-29 AFL1832 SVO → MSQ May 29, 16:00 UTCMay 29, 16:50 UTC50m
2026-05-27 AFL1124 SVO → AER May 27, 13:20 UTCMay 27, 13:40 UTC20m
2026-05-26 AFL1607 KUF → SVO May 26, 18:55 UTCMay 26, 19:15 UTC20m
2026-05-26 AFL1606 SVO → KUF May 26, 15:20 UTCMay 26, 18:19 UTC3h 0m
2026-05-26 AFL1416 SVO → SVX May 26, 06:49 UTCMay 26, 07:15 UTC25m
2026-05-25 AFL1028 SVO → MRV May 25, 09:50 UTCMay 25, 10:05 UTC15m
2026-05-25 AFL1485 KJA → SVO May 25, 03:10 UTCMay 25, 06:10 UTC3h 0m
2026-05-23 AFL1300 SVO → MRV May 23, 13:05 UTCMay 23, 13:25 UTC20m
2026-05-23 AFL011 LED → SVO May 23, 10:00 UTCMay 23, 10:25 UTC25m
2026-05-23 AFL010 SVO → LED May 23, 07:50 UTCMay 23, 08:00 UTC10m
2026-05-22 AFL2143 AYT → SVO May 22, 11:15 UTCMay 22, 13:10 UTC1h 55m
2026-05-22 AFL2142 SVO → AYT May 22, 09:00 UTCMay 22, 09:10 UTC10m
2026-05-21 AFL1323 MMK → SVO May 21, 21:35 UTCMay 21, 22:20 UTC45m
2026-05-20 AFL1869 EVN → SVO May 20, 20:55 UTCMay 20, 21:25 UTC30m
2026-05-20 AFL1868 SVO → EVN May 20, 19:10 UTCMay 20, 19:20 UTC10m
2026-05-20 AFL1868 SVO → EVN May 20, 16:30 UTCMay 20, 17:00 UTC30m
2026-05-20 AFL1261 UFA → SVO May 20, 07:55 UTCMay 20, 10:50 UTC2h 55m
2026-05-19 AFL1981 - May 19, 11:20 UTCMay 20, 08:10 UTC20h 51m
2026-05-18 AFL1980 - May 18, 17:30 UTCMay 19, 11:35 UTC18h 4m
2026-05-18 AFL1003 KGD → SVO May 18, 11:45 UTCMay 18, 13:40 UTC1h 55m
2026-05-18 AFL1002 SVO → KGD May 18, 01:30 UTCMay 18, 10:10 UTC8h 40m
2026-05-17 AFL1530 SVO → TOF May 17, 23:50 UTCMay 18, 00:05 UTC15m
2026-05-17 AFL1530 SVO → TOF May 17, 21:35 UTCMay 17, 21:45 UTC10m
2026-05-17 AFL1530 SVO → TOF May 17, 20:15 UTCMay 17, 20:35 UTC20m
2026-05-17 AFL1883 FRU → SVO May 17, 03:15 UTCMay 17, 15:40 UTC12h 25m
2026-05-16 AFL1883 FRU → SVO May 16, 08:20 UTCMay 17, 04:25 UTC20h 5m
2026-05-16 AFL1883 FRU → SVO May 16, 08:11 UTCMay 17, 04:25 UTC20h 15m
2026-05-15 AFL2145 AYT → SVO May 15, 17:40 UTCMay 16, 08:26 UTC14h 46m
2026-05-14 AFL1887 FRU → SVO May 14, 15:45 UTCMay 14, 16:15 UTC30m
2026-05-14 AFL1886 SVO → FRU May 14, 07:45 UTCMay 14, 15:10 UTC7h 25m
2026-05-14 AFL1957 NQZ → SVO May 14, 04:30 UTCMay 14, 04:51 UTC20m
2026-05-13 AFL1956 SVO → NQZ May 13, 21:10 UTCMay 14, 02:30 UTC5h 20m
2026-05-13 AFL1073 KGD → SVO May 13, 00:00 UTCMay 13, 01:45 UTC1h 45m
2026-05-12 AFL1072 SVO → KGD May 12, 12:40 UTCMay 12, 22:40 UTC10h 0m
2026-05-11 AFL1008 SVO → KGD May 11, 19:10 UTCMay 11, 19:55 UTC45m
2026-05-11 AFL1689 OMS → SVO May 11, 13:35 UTCMay 11, 14:50 UTC1h 15m
2026-05-10 AFL1017 KGD → SVO May 10, 10:19 UTCMay 10, 12:00 UTC1h 40m
2026-05-09 AFL1869 EVN → SVO May 9, 20:55 UTCMay 10, 08:20 UTC11h 25m
2026-05-09 AFL1868 SVO → EVN May 9, 17:05 UTCMay 9, 19:14 UTC2h 10m
2026-05-09 AFL010 SVO → LED May 9, 07:05 UTCMay 9, 08:10 UTC1h 5m
2026-05-09 AFL1883 FRU → SVO May 9, 04:15 UTCMay 9, 04:40 UTC25m
2026-05-08 AFL1883 FRU → SVO May 8, 20:10 UTCMay 9, 03:35 UTC7h 25m
2026-05-08 AFL1882 SVO → FRU May 8, 01:00 UTCMay 8, 20:25 UTC19h 25m
2026-05-06 AFL1149 GDZ → SVO May 6, 13:30 UTCMay 6, 13:40 UTC10m
2026-05-05 AFL1762 SVO → OMS May 5, 19:45 UTCMay 5, 20:10 UTC25m
2026-05-05 AFL1947 ALA → SVO May 5, 17:05 UTCMay 5, 17:25 UTC20m
2026-05-05 AFL1995 EVN → SVO May 5, 01:50 UTCMay 5, 16:00 UTC14h 10m
2026-05-04 AFL1025 KGD → SVO May 4, 15:30 UTCMay 4, 16:50 UTC1h 20m
2026-05-04 AFL1024 SVO → KGD May 4, 12:45 UTCMay 4, 13:35 UTC50m

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-73721 page for operator, model, and routing details .

Mode-S 151FF9 frequently asked

What is Mode-S code 151FF9?
151FF9 is an ICAO 24-bit transponder address. Allocated to Russia. Assigned to RA-73721.
Where is Mode-S 151FF9 registered?
Mode-S code 151FF9 is allocated to Russia (RU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 151FF9 broadcasting right now?
Yes. Mode-S 151FF9 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 151FF9, octal 05217771, decimal 1,384,441.
What flights does 151FF9 operate?
Mode-S 151FF9 has broadcast 20 distinct callsigns, including AFL2142, AFL2143, AFL1883, AFL1261, AFL1868.