Apparatus

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sensors Mode-S transponder

151D81

ICAO 24-bit transponder address · allocated to Russia

Currently assigned to RA-73089 · BOEING 737-800

Hex
151D81
Octal
05216601
Decimal
1,383,809
Country
RU
Tail
RA-73089
Type
B738
No current signal · last broadcast 13h ago
Flights observed
53
Distinct callsigns
20
Country
RU
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S 151D81.

Country allocation

The ICAO 24-bit address 151D81 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
UTA784 UTair Aviation 9 2026-05-29
UTA810 UTair Aviation 5 2026-05-28
UTA808 UTair Aviation 5 2026-05-17
UTA783 UTair Aviation 5 2026-05-29
UTA400 UTair Aviation 5 2026-05-14
UTA806 UTair Aviation 4 2026-05-26
UTA728 UTair Aviation 4 2026-05-12
UTA790 UTair Aviation 2 2026-05-08
UTA249 UTair Aviation 2 2026-05-18
UTA876 UTair Aviation 1 2026-05-03
UTA875 UTair Aviation 1 2026-05-03
UTA809 UTair Aviation 1 2026-04-16
UTA802B - 1 2026-05-02
UTA789 - 1 2026-04-16
UTA786 UTair Aviation 1 2026-05-01
UTA785 UTair Aviation 1 2026-05-01
UTA727 UTair Aviation 1 2026-05-22
UTA575 UTair Aviation 1 2026-04-19
UTA358 UTair Aviation 1 2026-05-11
UTA357 UTair Aviation 1 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 UTA784 AYT → VKO May 29, 14:40 UTCMay 29, 16:30 UTC1h 50m
2026-05-29 UTA783 VKO → AYT May 29, 12:40 UTCMay 29, 13:00 UTC20m
2026-05-28 UTA810 SKD → VKO May 28, 14:40 UTCMay 29, 04:45 UTC14h 5m
2026-05-26 UTA784 AYT → VKO May 26, 23:25 UTCMay 27, 16:05 UTC16h 41m
2026-05-26 UTA806 TAS → VKO May 26, 00:24 UTCMay 26, 15:45 UTC15h 20m
2026-05-25 UTA806 TAS → VKO May 25, 17:45 UTCMay 26, 15:45 UTC22h 0m
2026-05-25 UTA806 TAS → VKO May 25, 07:45 UTCMay 26, 00:54 UTC17h 9m
2026-05-24 UTA806 TAS → VKO May 24, 00:25 UTCMay 24, 01:05 UTC40m
2026-05-22 UTA727 KUF → TLV May 22, 06:00 UTCMay 22, 06:15 UTC15m
2026-05-21 UTA357 VKO → KUF May 21, 07:35 UTCMay 21, 18:05 UTC10h 30m
2026-05-20 UTA784 AYT → VKO May 20, 15:05 UTCMay 21, 07:40 UTC16h 35m
2026-05-20 UTA783 VKO → AYT May 20, 13:20 UTCMay 20, 13:30 UTC10m
2026-05-18 UTA249 VKO → AER May 18, 10:05 UTCMay 18, 19:35 UTC9h 29m
2026-05-17 UTA808 BHK → VKO May 17, 09:20 UTCMay 17, 09:55 UTC35m
2026-05-16 UTA249 VKO → AER May 16, 13:31 UTCMay 16, 13:55 UTC25m
2026-05-14 UTA400 GRV → VKO May 14, 14:20 UTCMay 14, 18:55 UTC4h 35m
2026-05-13 UTA810 SKD → VKO May 13, 21:00 UTCMay 13, 21:25 UTC25m
2026-05-12 UTA728 TLV → KUF May 12, 07:55 UTCMay 12, 08:05 UTC10m
2026-05-11 UTA358 KUF → VKO May 11, 19:20 UTCMay 11, 20:00 UTC40m
2026-05-11 UTA400 GRV → VKO May 11, 12:45 UTCMay 11, 17:45 UTC5h 0m
2026-05-10 UTA400 GRV → VKO May 10, 16:20 UTCMay 11, 13:00 UTC20h 40m
2026-05-10 UTA784 AYT → VKO May 10, 14:20 UTCMay 11, 13:00 UTC22h 40m
2026-05-10 UTA784 AYT → VKO May 10, 14:00 UTCMay 10, 16:25 UTC2h 25m
2026-05-10 UTA783 VKO → AYT May 10, 12:05 UTCMay 10, 12:25 UTC20m
2026-05-10 UTA783 VKO → AYT May 10, 10:35 UTCMay 10, 11:10 UTC35m
2026-05-08 UTA790 FEG → VKO May 8, 09:19 UTCMay 8, 20:55 UTC11h 35m
2026-05-06 UTA784 AYT → VKO May 6, 14:35 UTCMay 6, 16:30 UTC1h 55m
2026-05-06 UTA248 SGC → VKO May 6, 03:55 UTCMay 6, 04:40 UTC45m
2026-05-04 UTA784 AYT → VKO May 4, 14:05 UTCMay 4, 16:05 UTC2h 0m
2026-05-04 UTA783 VKO → AYT May 4, 11:10 UTCMay 4, 11:40 UTC30m
2026-05-03 UTA876 EVN → TJM May 3, 08:15 UTCMay 3, 08:45 UTC30m
2026-05-03 UTA875 TJM → EVN May 3, 06:20 UTCMay 3, 06:30 UTC10m
2026-05-02 UTA802B - May 2, 06:45 UTCMay 2, 19:20 UTC12h 35m
2026-05-01 UTA786 EVN → VKO May 1, 23:10 UTCMay 2, 19:20 UTC20h 10m
2026-05-01 UTA785 VKO → EVN May 1, 07:45 UTCMay 1, 21:20 UTC13h 35m
2026-04-30 UTA728 TLV → KUF Apr 30, 07:55 UTCApr 30, 18:00 UTC10h 6m
2026-04-29 UTA784 AYT → VKO Apr 29, 14:40 UTCApr 29, 16:40 UTC2h 0m
2026-04-28 UTA810 SKD → VKO Apr 28, 16:20 UTCApr 29, 11:40 UTC19h 20m
2026-04-28 UTA808 BHK → VKO Apr 28, 05:55 UTCApr 28, 16:55 UTC11h 0m
2026-04-27 UTA808 BHK → VKO Apr 27, 13:30 UTCApr 28, 06:30 UTC17h 0m
2026-04-25 UTA784 AYT → VKO Apr 25, 23:30 UTCApr 26, 16:25 UTC16h 55m
2026-04-25 UTA400 GRV → VKO Apr 25, 12:30 UTCApr 26, 11:20 UTC22h 50m
2026-04-25 UTA400 GRV → VKO Apr 25, 07:50 UTCApr 25, 23:40 UTC15h 50m
2026-04-24 UTA728 TLV → KUF Apr 24, 07:35 UTCApr 24, 14:00 UTC6h 25m
2026-04-23 UTA728 TLV → KUF Apr 23, 07:35 UTCApr 23, 07:50 UTC15m
2026-04-21 UTA808 BHK → VKO Apr 21, 06:35 UTCApr 21, 09:40 UTC3h 5m
2026-04-19 UTA575 VKO → KRR Apr 19, 02:55 UTCApr 19, 10:50 UTC7h 55m
2026-04-17 UTA790 FEG → VKO Apr 17, 03:55 UTCApr 17, 04:30 UTC35m
2026-04-16 UTA789 - Apr 16, 20:55 UTCApr 16, 21:05 UTC10m
2026-04-16 UTA810 SKD → VKO Apr 16, 14:40 UTCApr 16, 15:10 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-73089 page for operator, model, and routing details .

Mode-S 151D81 frequently asked

What is Mode-S code 151D81?
151D81 is an ICAO 24-bit transponder address. Allocated to Russia. Assigned to RA-73089.
Where is Mode-S 151D81 registered?
Mode-S code 151D81 is allocated to Russia (RU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 151D81 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 151D81, octal 05216601, decimal 1,383,809.
What flights does 151D81 operate?
Mode-S 151D81 has broadcast 20 distinct callsigns, including UTA784, UTA810, UTA808, UTA783, UTA400.