Apparatus

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sensors Mode-S transponder

151D4F

ICAO 24-bit transponder address · allocated to Russia

Currently assigned to RA-73039 · BOEING 737-500

Hex
151D4F
Octal
05216517
Decimal
1,383,759
Country
RU
Tail
RA-73039
Type
B735
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
85
Distinct callsigns
20
Country
RU
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S 151D4F.

Country allocation

The ICAO 24-bit address 151D4F 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
UTA446 UTair Aviation 13 2026-07-20
UTA445 UTair Aviation 11 2026-07-20
UTA456 UTair Aviation 4 2026-07-25
UTA6579 UTair Aviation 3 2026-07-21
UTA371 - 3 2026-07-12
UTA6578 - 2 2026-07-17
UTA6577 UTair Aviation 2 2026-07-21
UTA6421 UTair Aviation 2 2026-06-30
UTA596 UTair Aviation 2 2026-07-26
UTA595 UTair Aviation 2 2026-07-26
UTA455 UTair Aviation 2 2026-07-25
UTA375 - 2 2026-07-24
UTA356 UTair Aviation 2 2026-06-27
UTA351 - 2 2026-06-28
UTA9240 - 1 2026-06-17
UTA73039 - 1 2026-06-07
UTA6580 UTair Aviation 1 2026-04-23
UTA6422 UTair Aviation 1 2026-07-01
UTA6126 UTair Aviation 1 2026-04-19
UTA6125 UTair Aviation 1 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UTA334 NNM → VKO Jul 26, 19:35 UTCJul 26, 21:45 UTC2h 10m
2026-07-26 UTA333 VKO → NNM Jul 26, 16:10 UTCJul 26, 18:00 UTC1h 50m
2026-07-26 UTA596 USK → VKO Jul 26, 12:00 UTCJul 26, 14:40 UTC2h 40m
2026-07-26 UTA595 VKO → USK Jul 26, 08:30 UTCJul 26, 10:35 UTC2h 5m
2026-07-25 UTA456 NOJ → VKO Jul 25, 08:35 UTCJul 25, 15:20 UTC6h 45m
2026-07-25 UTA455 VKO → NOJ Jul 25, 07:35 UTCJul 25, 08:00 UTC25m
2026-07-25 UTA1352 - Jul 25, 04:55 UTCJul 25, 05:45 UTC50m
2026-07-24 UTA1351 VKO → HMA Jul 24, 22:50 UTCJul 25, 04:15 UTC5h 25m
2026-07-24 UTA1376 SCW → VKO Jul 24, 19:35 UTCJul 24, 21:20 UTC1h 45m
2026-07-24 UTA375 - Jul 24, 17:05 UTCJul 24, 18:25 UTC1h 20m
2026-07-24 UTA456 NOJ → VKO Jul 24, 07:40 UTCJul 24, 15:50 UTC8h 10m
2026-07-22 UTA180 - Jul 22, 13:05 UTCJul 22, 18:15 UTC5h 10m
2026-07-21 UTA6577 UFA → KGP Jul 21, 07:40 UTCJul 22, 01:15 UTC17h 35m
2026-07-21 UTA6579 KUF → KGP Jul 21, 03:55 UTCJul 22, 01:15 UTC21h 20m
2026-07-21 UTA6579 KUF → KGP Jul 21, 03:05 UTCJul 22, 01:15 UTC22h 10m
2026-07-20 UTA6579 KUF → KGP Jul 20, 11:50 UTCJul 21, 07:40 UTC19h 49m
2026-07-20 UTA445 VKO → KGP Jul 20, 10:40 UTCJul 21, 07:40 UTC20h 59m
2026-07-20 UTA446 KGP → VKO Jul 20, 05:35 UTCJul 20, 07:15 UTC1h 40m
2026-07-19 UTA446 KGP → VKO Jul 19, 11:35 UTCJul 20, 07:15 UTC19h 40m
2026-07-19 UTA445 VKO → KGP Jul 19, 10:25 UTCJul 19, 10:45 UTC20m
2026-07-18 UTA446 - Jul 18, 15:35 UTCJul 19, 07:05 UTC15h 30m
2026-07-17 UTA405 SGC → UFA Jul 17, 19:35 UTCJul 18, 15:40 UTC20h 6m
2026-07-17 UTA6578 - Jul 17, 16:19 UTCJul 18, 15:40 UTC23h 21m
2026-07-17 UTA445 VKO → KGP Jul 17, 10:35 UTCJul 17, 19:35 UTC9h 0m
2026-07-16 UTA446 - Jul 16, 16:19 UTCJul 17, 07:14 UTC14h 55m
2026-07-16 UTA6577 - Jul 16, 01:05 UTCJul 16, 16:19 UTC15h 15m
2026-07-15 UTA445 - Jul 15, 10:30 UTCJul 16, 01:10 UTC14h 40m
2026-07-15 UTA446 - Jul 15, 06:35 UTCJul 15, 07:05 UTC30m
2026-07-14 UTA446 - Jul 14, 17:30 UTCJul 15, 06:00 UTC12h 29m
2026-07-12 UTA371 - Jul 12, 20:15 UTCJul 13, 12:00 UTC15h 45m
2026-07-10 UTA1403 - Jul 10, 03:50 UTCJul 10, 19:20 UTC15h 30m
2026-07-09 UTA414 - Jul 9, 22:55 UTCJul 10, 19:20 UTC20h 25m
2026-07-09 UTA413 - Jul 9, 19:30 UTCJul 10, 03:55 UTC8h 25m
2026-07-06 UTA371 - Jul 6, 07:55 UTCJul 6, 11:30 UTC3h 35m
2026-07-04 UTA406 - Jul 4, 16:15 UTCJul 4, 20:10 UTC3h 55m
2026-07-03 UTA445 - Jul 3, 11:40 UTCJul 3, 11:55 UTC15m
2026-07-03 UTA445 - Jul 3, 10:45 UTCJul 3, 10:55 UTC10m
2026-07-03 UTA446 - Jul 3, 01:15 UTCJul 3, 07:35 UTC6h 20m
2026-07-02 UTA427 SGC → UFA Jul 2, 02:00 UTCJul 3, 01:20 UTC23h 20m
2026-07-01 UTA6422 SGC → IJK Jul 1, 17:35 UTCJul 2, 02:05 UTC8h 30m
2026-06-30 UTA6421 SGC → GSV Jun 30, 19:50 UTCJul 1, 16:20 UTC20h 30m
2026-06-30 UTA6421 SGC → GSV Jun 30, 19:35 UTCJul 1, 16:20 UTC20h 45m
2026-06-29 UTA352 - Jun 29, 17:59 UTCJun 30, 05:35 UTC11h 36m
2026-06-29 UTA456 NOJ → VKO Jun 29, 13:34 UTCJun 29, 15:04 UTC1h 30m
2026-06-29 UTA455 - Jun 29, 07:34 UTCJun 29, 07:44 UTC10m
2026-06-28 UTA351 - Jun 28, 17:55 UTCJun 29, 05:40 UTC11h 45m
2026-06-27 UTA356 GRV → VKO Jun 27, 21:34 UTCJun 28, 05:24 UTC7h 50m
2026-06-26 UTA356 GRV → VKO Jun 26, 20:34 UTCJun 27, 06:05 UTC9h 30m
2026-06-20 UTA250F - Jun 20, 06:35 UTCJun 20, 09:44 UTC3h 10m
2026-06-20 UTA249B - Jun 20, 01:05 UTCJun 20, 04:14 UTC3h 10m

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-73039 page for operator, model, and routing details .

Mode-S 151D4F frequently asked

What is Mode-S code 151D4F?
151D4F is an ICAO 24-bit transponder address. Allocated to Russia. Assigned to RA-73039.
Where is Mode-S 151D4F registered?
Mode-S code 151D4F is allocated to Russia (RU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 151D4F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 151D4F, octal 05216517, decimal 1,383,759.
What flights does 151D4F operate?
Mode-S 151D4F has broadcast 20 distinct callsigns, including UTA446, UTA445, UTA456, UTA6579, UTA371.