Apparatus

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sensors Mode-S transponder

151DF4

ICAO 24-bit transponder address · allocated to Russia

Currently assigned to RA-73204 · AIRBUS A-319

Hex
151DF4
Octal
05216764
Decimal
1,383,924
Country
RU
Tail
RA-73204
Type
A319
No current signal · last broadcast Jul 23, 14:15 UTC
Flights observed
121
Distinct callsigns
20
Country
RU
Last broadcast
Jul 23, 14:15 UTC

Last known position

Most recent position reported by Mode-S 151DF4.

Country allocation

The ICAO 24-bit address 151DF4 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
SDM6572 - 7 2026-07-21
SDM6924 Rossiya - Russian Airlines 6 2026-05-22
SDM6442 Rossiya - Russian Airlines 5 2026-06-07
SDM6342 - 5 2026-07-16
SDM6325 Rossiya - Russian Airlines 5 2026-06-15
SDM6926 - 4 2026-07-12
SDM6795 - 4 2026-07-04
SDM6725 - 4 2026-07-03
SDM6332 - 4 2026-07-14
SDM6326 Rossiya - Russian Airlines 4 2026-06-04
SDM6946 - 3 2026-06-21
SDM6923 - 3 2026-06-29
SDM6721 - 3 2026-07-07
SDM6569 - 3 2026-06-23
SDM6453 - 3 2026-06-15
SDM6450 - 3 2026-07-19
SDM6444 - 3 2026-07-09
SDM6925 - 2 2026-07-19
SDM6783 - 2 2026-07-06
SDM6722 - 2 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 SDM6565 - Jul 23, 14:00 UTCJul 23, 14:15 UTC15m
2026-07-21 SDM6531 LED → ALA Jul 21, 22:05 UTCJul 21, 22:20 UTC15m
2026-07-21 SDM6572 - Jul 21, 06:10 UTCJul 21, 17:40 UTC11h 30m
2026-07-20 SDM6572 - Jul 20, 20:10 UTCJul 21, 17:40 UTC21h 30m
2026-07-19 SDM6450 - Jul 19, 18:50 UTCJul 20, 10:00 UTC15h 10m
2026-07-19 SDM6925 - Jul 19, 16:40 UTCJul 19, 16:50 UTC10m
2026-07-19 SDM6449 - Jul 19, 06:05 UTCJul 19, 10:05 UTC4h 0m
2026-07-16 SDM6342 - Jul 16, 04:10 UTCJul 16, 08:00 UTC3h 50m
2026-07-15 SDM6595 - Jul 15, 06:30 UTCJul 15, 16:30 UTC10h 0m
2026-07-14 SDM6332 - Jul 14, 20:30 UTCJul 14, 21:25 UTC55m
2026-07-14 SDM6342 - Jul 14, 04:15 UTCJul 14, 18:40 UTC14h 25m
2026-07-13 SDM6342 - Jul 13, 19:05 UTCJul 14, 18:40 UTC23h 35m
2026-07-13 SDM6342 - Jul 13, 18:55 UTCJul 14, 08:05 UTC13h 10m
2026-07-12 SDM6926 - Jul 12, 20:30 UTCJul 13, 10:40 UTC14h 10m
2026-07-12 SDM6925 - Jul 12, 18:20 UTCJul 12, 18:30 UTC10m
2026-07-11 SDM6476 - Jul 11, 00:55 UTCJul 11, 07:00 UTC6h 5m
2026-07-09 SDM6444 - Jul 9, 06:55 UTCJul 9, 19:25 UTC12h 30m
2026-07-08 SDM6572 - Jul 8, 19:15 UTCJul 9, 19:00 UTC23h 45m
2026-07-08 SDM6572 - Jul 8, 16:30 UTCJul 9, 07:20 UTC14h 50m
2026-07-07 SDM6722 - Jul 7, 19:05 UTCJul 8, 17:05 UTC22h 0m
2026-07-07 SDM6722 - Jul 7, 18:45 UTCJul 8, 17:00 UTC22h 15m
2026-07-07 SDM6721 - Jul 7, 14:30 UTCJul 7, 20:15 UTC5h 45m
2026-07-06 SDM6721 - Jul 6, 21:05 UTCJul 7, 20:15 UTC23h 10m
2026-07-06 SDM6721 - Jul 6, 19:50 UTCJul 7, 19:00 UTC23h 10m
2026-07-06 SDM6784 - Jul 6, 15:05 UTCJul 7, 15:00 UTC23h 55m
2026-07-06 SDM6783 - Jul 6, 14:30 UTCJul 6, 21:05 UTC6h 35m
2026-07-05 SDM6783 - Jul 5, 19:55 UTCJul 6, 15:55 UTC20h 0m
2026-07-05 SDM6621 - Jul 5, 17:35 UTCJul 5, 17:45 UTC10m
2026-07-04 SDM6795 - Jul 4, 14:10 UTCJul 4, 20:05 UTC5h 55m
2026-07-03 SDM6795 - Jul 3, 21:25 UTCJul 4, 19:00 UTC21h 35m
2026-07-03 SDM6725 - Jul 3, 15:05 UTCJul 4, 14:55 UTC23h 50m
2026-07-03 SDM6725 - Jul 3, 14:55 UTCJul 3, 22:40 UTC7h 45m
2026-07-02 SDM6725 - Jul 2, 21:05 UTCJul 3, 16:30 UTC19h 25m
2026-07-02 SDM6725 - Jul 2, 17:05 UTCJul 3, 16:30 UTC23h 25m
2026-07-02 SDM6795 - Jul 2, 15:55 UTCJul 3, 15:00 UTC23h 5m
2026-07-01 SDM6795 - Jul 1, 19:50 UTCJul 2, 17:20 UTC21h 30m
2026-07-01 SDM6621 - Jul 1, 17:40 UTCJul 1, 17:55 UTC15m
2026-07-01 SDM6571 - Jul 1, 06:10 UTCJul 1, 09:05 UTC2h 55m
2026-06-29 SDM6331 - Jun 29, 12:24 UTCJun 29, 18:55 UTC6h 30m
2026-06-29 SDM6923 - Jun 29, 10:29 UTCJun 29, 10:40 UTC10m
2026-06-27 SDM6112 - Jun 27, 00:05 UTCJun 27, 05:39 UTC5h 35m
2026-06-26 SDM6332 - Jun 26, 20:10 UTCJun 26, 21:24 UTC1h 15m
2026-06-26 SDM6331 LED → KGD Jun 26, 12:24 UTCJun 26, 18:39 UTC6h 15m
2026-06-26 SDM6923 - Jun 26, 10:39 UTCJun 26, 10:50 UTC10m
2026-06-24 SDM6926 - Jun 24, 18:20 UTCJun 24, 18:50 UTC30m
2026-06-24 SDM6008 - Jun 24, 10:19 UTCJun 24, 11:20 UTC1h 0m
2026-06-24 SDM6007 - Jun 24, 07:54 UTCJun 24, 08:20 UTC25m
2026-06-23 SDM6569 - Jun 23, 10:04 UTCJun 23, 10:44 UTC40m
2026-06-23 SDM6569 LED → LED Jun 23, 07:40 UTCJun 23, 09:05 UTC1h 25m
2026-06-21 SDM6946 - Jun 21, 04:20 UTCJun 21, 04:44 UTC25m

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-73204 page for operator, model, and routing details .

Mode-S 151DF4 frequently asked

What is Mode-S code 151DF4?
151DF4 is an ICAO 24-bit transponder address. Allocated to Russia. Assigned to RA-73204.
Where is Mode-S 151DF4 registered?
Mode-S code 151DF4 is allocated to Russia (RU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 151DF4 broadcasting right now?
No active broadcast right now. Last signal was Jul 23, 14:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 151DF4, octal 05216764, decimal 1,383,924.
What flights does 151DF4 operate?
Mode-S 151DF4 has broadcast 20 distinct callsigns, including SDM6572, SDM6924, SDM6442, SDM6342, SDM6325.