Apparatus

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sensors Mode-S transponder

151D4E

ICAO 24-bit transponder address · allocated to Russia

Currently assigned to RA-73038 · BOEING 737-500

Hex
151D4E
Octal
05216516
Decimal
1,383,758
Country
RU
Tail
RA-73038
Type
B735
No current signal · last broadcast 25m ago
Flights observed
143
Distinct callsigns
20
Country
RU
Last broadcast
25m ago

Last known position

Most recent position reported by Mode-S 151D4E.

Country allocation

The ICAO 24-bit address 151D4E 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
UTA375 - 16 2026-07-14
UTA376 - 13 2026-07-12
UTA596 - 12 2026-07-12
UTA595 - 9 2026-07-12
UTA456 UTair Aviation 8 2026-07-11
UTA333 UTair Aviation 7 2026-05-05
UTA446 UTair Aviation 6 2026-05-14
UTA6316 - 5 2026-07-14
UTA478 UTair Aviation 5 2026-05-21
UTA352 - 5 2026-06-22
UTA1376 - 5 2026-07-10
UTA445 UTair Aviation 4 2026-05-15
UTA351 UTair Aviation 4 2026-05-08
UTA455 - 3 2026-07-13
UTA6578 UTair Aviation 2 2026-05-15
UTA6436 - 2 2026-04-13
UTA574 UTair Aviation 2 2026-04-25
UTA424 UTair Aviation 2 2026-05-18
UTA334 UTair Aviation 2 2026-05-04
UTA6577 UTair Aviation 1 2026-05-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UTA375 - Jul 14, 15:55 UTCJul 14, 17:25 UTC1h 30m
2026-07-14 UTA6316 - Jul 14, 03:10 UTCJul 14, 10:30 UTC7h 20m
2026-07-14 UTA6315 - Jul 14, 02:15 UTCJul 14, 02:35 UTC20m
2026-07-13 UTA356B - Jul 13, 17:45 UTCJul 14, 00:55 UTC7h 10m
2026-07-13 UTA455 - Jul 13, 07:35 UTCJul 13, 14:50 UTC7h 15m
2026-07-12 UTA376 - Jul 12, 21:00 UTCJul 12, 21:20 UTC20m
2026-07-12 UTA376 - Jul 12, 19:50 UTCJul 12, 20:20 UTC30m
2026-07-12 UTA375 - Jul 12, 18:15 UTCJul 12, 18:25 UTC10m
2026-07-12 UTA375 - Jul 12, 17:01 UTCJul 12, 17:15 UTC15m
2026-07-12 UTA596 - Jul 12, 15:05 UTCJul 12, 15:25 UTC20m
2026-07-12 UTA596 - Jul 12, 12:35 UTCJul 12, 13:50 UTC1h 15m
2026-07-12 UTA595 - Jul 12, 08:15 UTCJul 12, 10:40 UTC2h 25m
2026-07-11 UTA456 NOJ → VKO Jul 11, 07:35 UTCJul 11, 15:50 UTC8h 15m
2026-07-10 UTA1376 - Jul 10, 21:05 UTCJul 10, 21:30 UTC25m
2026-07-10 UTA1376 - Jul 10, 19:50 UTCJul 10, 20:25 UTC35m
2026-07-10 UTA375 - Jul 10, 17:05 UTCJul 10, 18:30 UTC1h 25m
2026-07-10 UTA456 NOJ → VKO Jul 10, 07:40 UTCJul 10, 15:30 UTC7h 50m
2026-07-09 UTA376 - Jul 9, 20:15 UTCJul 9, 20:30 UTC15m
2026-07-09 UTA376 - Jul 9, 18:55 UTCJul 9, 19:30 UTC35m
2026-07-09 UTA375 - Jul 9, 16:20 UTCJul 9, 17:35 UTC1h 15m
2026-07-09 UTA596 - Jul 9, 14:15 UTCJul 9, 14:30 UTC15m
2026-07-09 UTA596 - Jul 9, 12:10 UTCJul 9, 13:30 UTC1h 20m
2026-07-09 UTA595 - Jul 9, 08:15 UTCJul 9, 10:20 UTC2h 5m
2026-07-08 UTA376 - Jul 8, 20:05 UTCJul 8, 20:30 UTC25m
2026-07-08 UTA376 - Jul 8, 18:50 UTCJul 8, 19:20 UTC30m
2026-07-08 UTA375 - Jul 8, 16:05 UTCJul 8, 17:20 UTC1h 15m
2026-07-08 UTA1250 - Jul 8, 08:55 UTCJul 8, 11:30 UTC2h 35m
2026-07-07 UTA1249 - Jul 7, 00:05 UTCJul 7, 07:20 UTC7h 15m
2026-07-06 UTA1376 - Jul 6, 20:45 UTCJul 6, 21:15 UTC30m
2026-07-06 UTA1376 - Jul 6, 19:30 UTCJul 6, 20:10 UTC40m
2026-07-06 UTA375 - Jul 6, 16:40 UTCJul 6, 18:00 UTC1h 20m
2026-07-06 UTA456 NOJ → VKO Jul 6, 14:50 UTCJul 6, 15:15 UTC25m
2026-07-06 UTA455 - Jul 6, 07:35 UTCJul 6, 14:00 UTC6h 25m
2026-07-05 UTA376 - Jul 5, 18:45 UTCJul 5, 20:25 UTC1h 40m
2026-07-05 UTA375 - Jul 5, 16:00 UTCJul 5, 17:25 UTC1h 25m
2026-07-05 UTA596 - Jul 5, 12:00 UTCJul 5, 14:30 UTC2h 30m
2026-07-05 UTA595 - Jul 5, 08:00 UTCJul 5, 10:05 UTC2h 5m
2026-07-04 UTA1376 - Jul 4, 22:25 UTCJul 5, 00:05 UTC1h 40m
2026-07-04 UTA1375 - Jul 4, 19:30 UTCJul 4, 20:45 UTC1h 15m
2026-07-04 UTA6316 - Jul 4, 00:25 UTCJul 4, 17:20 UTC16h 55m
2026-07-03 UTA6316 - Jul 3, 00:15 UTCJul 3, 17:05 UTC16h 50m
2026-07-02 UTA6316 - Jul 2, 00:25 UTCJul 2, 17:05 UTC16h 40m
2026-07-01 UTA376 - Jul 1, 19:10 UTCJul 1, 20:45 UTC1h 35m
2026-07-01 UTA375 - Jul 1, 16:20 UTCJul 1, 17:45 UTC1h 25m
2026-07-01 UTA6316 - Jul 1, 02:20 UTCJul 1, 10:30 UTC8h 10m
2026-06-30 UTA398 - Jun 30, 04:45 UTCJun 30, 08:05 UTC3h 20m
2026-06-29 UTA397 - Jun 29, 08:39 UTCJun 29, 12:09 UTC3h 30m
2026-06-27 UTA376 - Jun 27, 19:00 UTCJun 27, 20:24 UTC1h 25m
2026-06-27 UTA375 - Jun 27, 16:10 UTCJun 27, 17:34 UTC1h 25m
2026-06-26 UTA456 NOJ → VKO Jun 26, 07:39 UTCJun 26, 15:34 UTC7h 55m

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-73038 page for operator, model, and routing details .

Mode-S 151D4E frequently asked

What is Mode-S code 151D4E?
151D4E is an ICAO 24-bit transponder address. Allocated to Russia. Assigned to RA-73038.
Where is Mode-S 151D4E registered?
Mode-S code 151D4E is allocated to Russia (RU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 151D4E broadcasting right now?
No active broadcast right now. Last signal was 25m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 151D4E, octal 05216516, decimal 1,383,758.
What flights does 151D4E operate?
Mode-S 151D4E has broadcast 20 distinct callsigns, including UTA375, UTA376, UTA596, UTA595, UTA456.