Apparatus

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sensors Mode-S transponder

151DA1

ICAO 24-bit transponder address · allocated to Russia

Currently assigned to RA-73121 · BOEING 737-800

Hex
151DA1
Octal
05216641
Decimal
1,383,841
Country
RU
Tail
RA-73121
Type
B738
No current signal · last broadcast 43m ago
Flights observed
86
Distinct callsigns
20
Country
RU
Last broadcast
43m ago

Last known position

Most recent position reported by Mode-S 151DA1.

Country allocation

The ICAO 24-bit address 151DA1 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
AFL909 Aeroflot Russian Airlines 8 2026-05-21
AFL913 Aeroflot Russian Airlines 6 2026-05-24
AFL912 Aeroflot Russian Airlines 6 2026-05-24
AFL2146 Aeroflot Russian Airlines 6 2026-05-25
AFL426 Aeroflot Russian Airlines 4 2026-05-30
AFL424 Aeroflot Russian Airlines 4 2026-05-27
AFL2149 Aeroflot Russian Airlines 3 2026-05-07
AFL2123 Aeroflot Russian Airlines 3 2026-05-04
AFL2122 Aeroflot Russian Airlines 3 2026-05-04
AFL676 Aeroflot Russian Airlines 2 2026-04-28
AFL431 - 2 2026-04-13
AFL430 - 2 2026-04-13
AFL427 Aeroflot Russian Airlines 2 2026-05-30
AFL425 Aeroflot Russian Airlines 2 2026-05-28
AFL423 Aeroflot Russian Airlines 2 2026-05-12
AFL422 Aeroflot Russian Airlines 2 2026-04-29
AFL2148 Aeroflot Russian Airlines 2 2026-05-07
AFL2147 Aeroflot Russian Airlines 2 2026-05-25
AFL2121 Aeroflot Russian Airlines 2 2026-05-13
AFL2120 Aeroflot Russian Airlines 2 2026-05-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 AFL427 SSH → SVO May 30, 12:55 UTCMay 30, 14:15 UTC1h 20m
2026-05-30 AFL426 SVO → SSH May 30, 08:55 UTCMay 30, 10:25 UTC1h 30m
2026-05-30 AFL426 SVO → SSH May 30, 04:45 UTCMay 30, 05:15 UTC30m
2026-05-29 AFL2135 IST → SVO May 29, 20:50 UTCMay 29, 21:20 UTC30m
2026-05-29 AFL2134 SVO → IST May 29, 18:10 UTCMay 29, 18:35 UTC25m
2026-05-28 AFL425 HRG → SVO May 28, 02:45 UTCMay 28, 20:45 UTC18h 0m
2026-05-27 AFL424 SVO → HRG May 27, 14:20 UTCMay 28, 14:15 UTC23h 55m
2026-05-27 AFL424 SVO → HRG May 27, 13:30 UTCMay 28, 08:10 UTC18h 40m
2026-05-27 AFL424 SVO → HRG May 27, 10:20 UTCMay 28, 08:10 UTC21h 50m
2026-05-27 AFL424 SVO → HRG May 27, 09:25 UTCMay 28, 08:10 UTC22h 45m
2026-05-26 AFL2124 SVO → AYT May 26, 06:29 UTCMay 26, 06:54 UTC25m
2026-05-25 AFL2147 AYT → SVO May 25, 15:10 UTCMay 25, 17:05 UTC1h 55m
2026-05-25 AFL2146 SVO → AYT May 25, 13:20 UTCMay 25, 13:30 UTC10m
2026-05-25 AFL2146 SVO → AYT May 25, 12:10 UTCMay 25, 12:40 UTC30m
2026-05-25 AFL2146 SVO → AYT May 25, 08:55 UTCMay 25, 09:30 UTC35m
2026-05-24 AFL913 SSH → KZN May 24, 13:15 UTCMay 24, 17:50 UTC4h 35m
2026-05-24 AFL912 KZN → SSH May 24, 08:40 UTCMay 24, 11:15 UTC2h 35m
2026-05-23 AFL912 KZN → SSH May 23, 11:15 UTCMay 24, 10:15 UTC23h 0m
2026-05-23 AFL908 KZN → HRG May 23, 02:45 UTCMay 23, 11:25 UTC8h 40m
2026-05-22 AFL913 SSH → KZN May 22, 12:40 UTCMay 23, 11:25 UTC22h 44m
2026-05-22 AFL913 SSH → KZN May 22, 08:20 UTCMay 23, 08:15 UTC23h 54m
2026-05-22 AFL912 KZN → SSH May 22, 06:50 UTCMay 23, 04:15 UTC21h 24m
2026-05-21 AFL912 KZN → SSH May 21, 17:50 UTCMay 22, 14:05 UTC20h 15m
2026-05-21 AFL912 KZN → SSH May 21, 14:20 UTCMay 22, 14:05 UTC23h 45m
2026-05-21 AFL909 HRG → KZN May 21, 13:20 UTCMay 22, 09:30 UTC20h 10m
2026-05-21 AFL909 HRG → KZN May 21, 08:20 UTCMay 22, 08:15 UTC23h 55m
2026-05-21 AFL909 HRG → KZN May 21, 08:00 UTCMay 21, 18:00 UTC10h 0m
2026-05-20 AFL909 HRG → KZN May 20, 18:20 UTCMay 21, 18:00 UTC23h 40m
2026-05-20 AFL909 HRG → KZN May 20, 16:20 UTCMay 21, 16:15 UTC23h 55m
2026-05-20 AFL913 SSH → KZN May 20, 14:50 UTCMay 21, 14:15 UTC23h 25m
2026-05-20 AFL913 SSH → KZN May 20, 10:20 UTCMay 21, 09:25 UTC23h 5m
2026-05-20 AFL913 SSH → KZN May 20, 09:50 UTCMay 21, 08:15 UTC22h 25m
2026-05-19 AFL912 KZN → SSH May 19, 16:20 UTCMay 20, 16:15 UTC23h 56m
2026-05-19 AFL909 HRG → KZN May 19, 14:40 UTCMay 20, 11:15 UTC20h 36m
2026-05-19 AFL909 HRG → KZN May 19, 12:55 UTCMay 20, 11:15 UTC22h 21m
2026-05-19 AFL909 HRG → KZN May 19, 08:40 UTCMay 19, 16:25 UTC7h 45m
2026-05-17 AFL1865 EVN → SVO May 17, 18:50 UTCMay 17, 19:50 UTC1h 0m
2026-05-17 AFL2133 IST → SVO May 17, 05:20 UTCMay 17, 05:30 UTC10m
2026-05-14 AFL2147 AYT → SVO May 14, 15:25 UTCMay 14, 17:40 UTC2h 15m
2026-05-14 AFL2146 SVO → AYT May 14, 13:30 UTCMay 14, 13:40 UTC10m
2026-05-14 AFL2146 SVO → AYT May 14, 12:00 UTCMay 14, 12:35 UTC35m
2026-05-14 AFL2146 SVO → AYT May 14, 08:55 UTCMay 14, 09:25 UTC30m
2026-05-13 AFL2121 BJV → SVO May 13, 11:20 UTCMay 13, 13:55 UTC2h 35m
2026-05-13 AFL2120 SVO → BJV May 13, 09:10 UTCMay 13, 09:35 UTC25m
2026-05-12 AFL423 HRG → SVO May 12, 08:50 UTCMay 12, 17:05 UTC8h 15m
2026-05-09 AFL427 SSH → SVO May 9, 12:50 UTCMay 9, 16:45 UTC3h 55m
2026-05-09 AFL426 SVO → SSH May 9, 07:00 UTCMay 9, 10:45 UTC3h 45m
2026-05-09 AFL426 SVO → SSH May 9, 04:40 UTCMay 9, 05:30 UTC50m
2026-05-08 AFL423 HRG → SVO May 8, 12:00 UTCMay 8, 20:45 UTC8h 45m
2026-05-07 AFL1864 SVO → EVN May 7, 14:35 UTCMay 7, 14:50 UTC15m

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-73121 page for operator, model, and routing details .

Mode-S 151DA1 frequently asked

What is Mode-S code 151DA1?
151DA1 is an ICAO 24-bit transponder address. Allocated to Russia. Assigned to RA-73121.
Where is Mode-S 151DA1 registered?
Mode-S code 151DA1 is allocated to Russia (RU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 151DA1 broadcasting right now?
No active broadcast right now. Last signal was 43m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 151DA1, octal 05216641, decimal 1,383,841.
What flights does 151DA1 operate?
Mode-S 151DA1 has broadcast 20 distinct callsigns, including AFL909, AFL913, AFL912, AFL2146, AFL426.