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 2h ago
Flights observed
119
Distinct callsigns
20
Country
RU
Last broadcast
2h 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 8 2026-06-12
PBD836 - 6 2026-06-12
PBD6838 Pobeda 4 2026-05-03
PBD995 Pobeda 3 2026-05-31
PBD993 - 3 2026-06-13
PBD973 Pobeda 3 2026-06-04
PBD964 - 3 2026-07-14
PBD963 - 3 2026-07-14
PBD859 - 3 2026-06-30
PBD6837 - 3 2026-05-03
PBD6831 Pobeda 3 2026-06-02
PBD840 - 2 2026-07-10
PBD770 - 2 2026-06-13
PBD730 - 2 2026-06-11
PBD6939 - 2 2026-04-18
PBD6905 - 2 2026-04-20
PBD6834 - 2 2026-05-03
PBD6833 Pobeda 2 2026-06-18
PBD6832 - 2 2026-04-14
PBD6544 - 2 2026-04-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 PBD964 - Jul 14, 18:25 UTCJul 14, 18:55 UTC30m
2026-07-14 PBD964 - Jul 14, 14:20 UTCJul 14, 16:15 UTC1h 55m
2026-07-14 PBD963 - Jul 14, 11:10 UTCJul 14, 13:15 UTC2h 5m
2026-07-11 PBD261 - Jul 11, 18:05 UTCJul 11, 18:35 UTC30m
2026-07-10 PBD840 - Jul 10, 09:55 UTCJul 10, 10:15 UTC20m
2026-07-10 PBD839 - Jul 10, 08:25 UTCJul 10, 08:50 UTC25m
2026-07-06 PBD590 - Jul 6, 12:10 UTCJul 6, 13:10 UTC1h 0m
2026-07-05 PBD330 GSV → GSV Jul 5, 19:25 UTCJul 5, 19:30 UTC5m
2026-07-03 PBD330 - Jul 3, 19:45 UTCJul 3, 19:55 UTC10m
2026-07-01 PBD860 - Jul 1, 12:15 UTCJul 1, 14:00 UTC1h 45m
2026-06-30 PBD859 - Jun 30, 16:25 UTCJul 1, 11:05 UTC18h 40m
2026-06-30 PBD859 - Jun 30, 15:05 UTCJul 1, 11:05 UTC20h 0m
2026-06-30 PBD859 - Jun 30, 13:10 UTCJun 30, 14:00 UTC50m
2026-06-27 PBD535 - Jun 27, 18:09 UTCJun 27, 18:45 UTC35m
2026-06-26 PBD736 - Jun 26, 12:05 UTCJun 26, 13:40 UTC1h 35m
2026-06-26 PBD735 - Jun 26, 09:14 UTCJun 26, 09:59 UTC45m
2026-06-25 PBD505 - Jun 25, 11:50 UTCJun 25, 11:59 UTC10m
2026-06-23 PBD340 - Jun 23, 05:24 UTCJun 23, 06:29 UTC1h 5m
2026-06-21 PBD957 - Jun 21, 12:14 UTCJun 21, 12:40 UTC25m
2026-06-21 PBD6841 SVO → SVO Jun 21, 05:30 UTCJun 21, 05:49 UTC20m
2026-06-18 PBD6833 SVO → SVO Jun 18, 18:05 UTCJun 18, 19:05 UTC1h 0m
2026-06-17 PBD942 IST → IST Jun 17, 19:15 UTCJun 18, 18:15 UTC23h 0m
2026-06-17 PBD941 IST → IST Jun 17, 17:25 UTCJun 17, 17:50 UTC25m
2026-06-15 PBD980 - Jun 15, 10:30 UTCJun 15, 12:25 UTC1h 55m
2026-06-15 PBD979 - Jun 15, 08:54 UTCJun 15, 09:25 UTC30m
2026-06-14 PBD964 - Jun 14, 11:00 UTCJun 15, 09:25 UTC22h 25m
2026-06-14 PBD963 - Jun 14, 08:45 UTCJun 14, 09:20 UTC35m
2026-06-13 PBD963 - Jun 13, 10:20 UTCJun 14, 09:20 UTC23h 0m
2026-06-13 PBD770 - Jun 13, 10:00 UTCJun 13, 10:25 UTC25m
2026-06-13 PBD993 - Jun 13, 08:15 UTCJun 13, 08:40 UTC25m
2026-06-12 PBD836 - Jun 12, 11:20 UTCJun 12, 12:45 UTC1h 25m
2026-06-12 PBD836 - Jun 12, 10:30 UTCJun 12, 10:45 UTC15m
2026-06-12 PBD835 VKO → VKO Jun 12, 09:05 UTCJun 12, 09:25 UTC20m
2026-06-11 PBD835 VKO → VKO Jun 11, 19:15 UTCJun 12, 08:30 UTC13h 16m
2026-06-11 PBD840 AYT → AYT Jun 11, 11:20 UTCJun 11, 13:35 UTC2h 15m
2026-06-11 PBD730 - Jun 11, 02:40 UTCJun 11, 10:20 UTC7h 40m
2026-06-10 PBD730 - Jun 10, 10:20 UTCJun 11, 10:15 UTC23h 55m
2026-06-10 PBD993 - Jun 10, 08:25 UTCJun 10, 08:45 UTC20m
2026-06-09 PBD993 - Jun 9, 06:55 UTCJun 9, 08:00 UTC1h 5m
2026-06-08 PBD517 LED → LED Jun 8, 14:15 UTCJun 8, 14:40 UTC25m
2026-06-08 PBD540 - Jun 8, 13:15 UTCJun 8, 13:25 UTC10m
2026-06-07 PBD549 - Jun 7, 23:30 UTCJun 8, 00:00 UTC30m
2026-06-07 PBD617 - Jun 7, 07:45 UTCJun 7, 08:45 UTC1h 0m
2026-06-07 PBD6511 - Jun 7, 00:34 UTCJun 7, 01:00 UTC25m
2026-06-06 PBD340 - Jun 6, 00:45 UTCJun 6, 08:45 UTC8h 0m
2026-06-04 PBD974 IST → IST Jun 4, 14:05 UTCJun 4, 14:35 UTC30m
2026-06-04 PBD973 IST → ISL Jun 4, 12:10 UTCJun 4, 12:25 UTC15m
2026-06-04 PBD973 IST → ISL Jun 4, 10:45 UTCJun 4, 11:25 UTC40m
2026-06-02 PBD6831 SVO → KGD Jun 2, 12:50 UTCJun 2, 14:50 UTC2h 0m
2026-05-31 PBD996 IST → IST May 31, 17:25 UTCJun 1, 09:25 UTC16h 0m

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 2h 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, PBD836, PBD6838, PBD995, PBD993.