Apparatus

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sensors Mode-S transponder

151E21

ICAO 24-bit transponder address · allocated to Russia

Currently assigned to RA-73249 · BOEING 737-800

Hex
151E21
Octal
05217041
Decimal
1,383,969
Country
RU
Tail
RA-73249
Type
B738
No current signal · last broadcast 1d ago
Flights observed
65
Distinct callsigns
20
Country
RU
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 151E21.

Country allocation

The ICAO 24-bit address 151E21 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
PBD835 Pobeda 4 2026-05-28
PBD6838 Pobeda 4 2026-05-03
PBD836 - 3 2026-05-28
PBD6837 - 3 2026-05-03
PBD995 Pobeda 2 2026-05-27
PBD6939 - 2 2026-04-18
PBD6905 - 2 2026-04-20
PBD6834 - 2 2026-05-03
PBD6832 - 2 2026-04-14
PBD6831 - 2 2026-04-14
PBD6544 - 2 2026-04-21
PBD6532 - 2 2026-04-27
PBD6531 - 2 2026-04-26
PBD6522 - 2 2026-04-16
PBD324 - 2 2026-05-11
PBD263 Pobeda 2 2026-05-19
PBD973 Pobeda 1 2026-04-29
PBD968 - 1 2026-05-14
PBD862 - 1 2026-04-20
PBD770 - 1 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-28 PBD836 - May 28, 10:35 UTCMay 28, 12:15 UTC1h 40m
2026-05-28 PBD835 VKO → VKO May 28, 09:30 UTCMay 28, 09:45 UTC15m
2026-05-28 PBD835 VKO → VKO May 28, 08:10 UTCMay 28, 08:45 UTC35m
2026-05-27 PBD995 VKO → IST May 27, 10:35 UTCMay 27, 10:55 UTC20m
2026-05-26 PBD424 - May 26, 16:20 UTCMay 27, 08:30 UTC16h 10m
2026-05-26 PBD995 VKO → IST May 26, 14:20 UTCMay 26, 14:30 UTC10m
2026-05-26 PBD436 SVO → VKO May 26, 02:29 UTCMay 26, 03:00 UTC30m
2026-05-22 PBD836 - May 22, 10:40 UTCMay 22, 10:55 UTC15m
2026-05-22 PBD835 VKO → VKO May 22, 08:05 UTCMay 22, 09:35 UTC1h 30m
2026-05-19 PBD263 VKO → KGD May 19, 10:55 UTCMay 19, 11:20 UTC25m
2026-05-18 PBD769 - May 18, 13:50 UTCMay 18, 14:05 UTC15m
2026-05-16 PBD770 - May 16, 10:20 UTCMay 16, 10:35 UTC15m
2026-05-14 PBD968 - May 14, 18:40 UTCMay 15, 04:25 UTC9h 45m
2026-05-14 PBD836 - May 14, 10:40 UTCMay 14, 12:55 UTC2h 15m
2026-05-14 PBD835 VKO → VKO May 14, 08:00 UTCMay 14, 09:45 UTC1h 45m
2026-05-11 PBD324 - May 11, 12:00 UTCMay 11, 22:35 UTC10h 35m
2026-05-10 PBD324 - May 10, 21:25 UTCMay 11, 17:45 UTC20h 21m
2026-05-10 PBD528 - May 10, 02:34 UTCMay 10, 21:30 UTC18h 55m
2026-05-10 PBD1569 - May 10, 00:15 UTCMay 10, 00:45 UTC30m
2026-05-06 PBD264 KGD → VKO May 6, 18:05 UTCMay 6, 19:50 UTC1h 45m
2026-05-06 PBD263 VKO → KGD May 6, 16:05 UTCMay 6, 16:55 UTC50m
2026-05-06 PBD432 - May 6, 11:25 UTCMay 6, 12:05 UTC40m
2026-05-03 PBD6834 - May 3, 20:45 UTCMay 3, 21:44 UTC1h 0m
2026-05-03 PBD6838 KGD → SVO May 3, 14:20 UTCMay 3, 19:25 UTC5h 5m
2026-05-03 PBD6837 - May 3, 11:50 UTCMay 3, 12:45 UTC55m
2026-05-01 PBD6834 - May 1, 17:50 UTCMay 1, 22:25 UTC4h 35m
2026-05-01 PBD6833 SVO → SVO May 1, 01:35 UTCMay 1, 16:25 UTC14h 50m
2026-04-30 PBD6947 SVO → SVO Apr 30, 13:00 UTCApr 30, 13:20 UTC20m
2026-04-29 PBD973 IST → ISL Apr 29, 08:50 UTCApr 29, 15:15 UTC6h 26m
2026-04-28 PBD6862 GSV → GSV Apr 28, 20:00 UTCApr 28, 20:30 UTC30m
2026-04-28 PBD6859 SVO → SVO Apr 28, 05:35 UTCApr 28, 06:00 UTC25m
2026-04-27 PBD6532 - Apr 27, 01:10 UTCApr 27, 15:15 UTC14h 5m
2026-04-26 PBD6532 - Apr 26, 19:35 UTCApr 27, 15:15 UTC19h 40m
2026-04-26 PBD6531 SVO → SVO Apr 26, 18:35 UTCApr 26, 18:50 UTC15m
2026-04-26 PBD538 - Apr 26, 14:50 UTCApr 26, 15:05 UTC15m
2026-04-25 PBD210 LED → VKO Apr 25, 14:30 UTCApr 25, 15:35 UTC1h 5m
2026-04-24 PBD6568 CEK → CEK Apr 24, 09:45 UTCApr 24, 18:55 UTC9h 10m
2026-04-23 PBD6925 SVO → SVO Apr 23, 16:10 UTCApr 23, 16:35 UTC25m
2026-04-22 PBD6531 - Apr 22, 18:15 UTCApr 22, 19:40 UTC1h 25m
2026-04-22 PBD6836 KGD → SVO Apr 22, 15:10 UTCApr 22, 17:10 UTC2h 0m
2026-04-22 PBD6835 SVO → KGD Apr 22, 13:00 UTCApr 22, 13:40 UTC40m
2026-04-22 PBD6838 KGD → SVO Apr 22, 07:45 UTCApr 22, 09:45 UTC2h 0m
2026-04-22 PBD6837 - Apr 22, 04:30 UTCApr 22, 06:30 UTC2h 0m
2026-04-21 PBD6544 - Apr 21, 12:10 UTCApr 21, 12:35 UTC25m
2026-04-21 PBD6544 - Apr 21, 10:30 UTCApr 21, 11:35 UTC1h 5m
2026-04-21 PBD1339 - Apr 21, 07:25 UTCApr 21, 07:45 UTC20m
2026-04-20 PBD862 - Apr 20, 13:15 UTCApr 20, 13:25 UTC10m
2026-04-20 PBD6905 SVO → SVO Apr 20, 05:10 UTCApr 20, 05:40 UTC30m
2026-04-19 PBD6845 - Apr 19, 13:10 UTCApr 19, 13:30 UTC20m
2026-04-18 PBD6939 SVO → SVO Apr 18, 05:25 UTCApr 18, 05:40 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-73249 page for operator, model, and routing details .

Mode-S 151E21 frequently asked

What is Mode-S code 151E21?
151E21 is an ICAO 24-bit transponder address. Allocated to Russia. Assigned to RA-73249.
Where is Mode-S 151E21 registered?
Mode-S code 151E21 is allocated to Russia (RU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 151E21 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 151E21, octal 05217041, decimal 1,383,969.
What flights does 151E21 operate?
Mode-S 151E21 has broadcast 20 distinct callsigns, including PBD835, PBD6838, PBD836, PBD6837, PBD995.