Apparatus

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sensors Mode-S transponder

151E2D

ICAO 24-bit transponder address · allocated to Russia

Currently assigned to RA-73261 · BOEING 737-800

Hex
151E2D
Octal
05217055
Decimal
1,383,981
Country
RU
Tail
RA-73261
Type
B738
No current signal · last broadcast 13d ago
Flights observed
87
Distinct callsigns
20
Country
RU
Last broadcast
13d ago

Last known position

Most recent position reported by Mode-S 151E2D.

Country allocation

The ICAO 24-bit address 151E2D 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
SYL487 - 20 2026-07-10
SYL736 Yakutia Airlines 9 2026-06-23
SYL473 - 7 2026-07-10
SYL476 Yakutia Airlines 6 2026-06-10
SYL453 Yakutia Airlines 6 2026-07-22
SYL475 - 4 2026-06-21
SYL474 Yakutia Airlines 4 2026-06-15
SYL748 Yakutia Airlines 3 2026-05-31
SYL479 - 3 2026-07-18
SYL454 - 3 2026-07-17
STL479 - 3 2026-07-24
SYL9997 Yakutia Airlines 2 2026-05-30
SYL9915 - 2 2026-06-30
SYL735 Yakutia Airlines 2 2026-06-01
SYL488 Yakutia Airlines 2 2026-06-19
SYL468 Yakutia Airlines 2 2026-07-26
SYL465 Yakutia Airlines 2 2026-07-23
SYL9986 Yakutia Airlines 1 2026-05-29
SYL9914 Yakutia Airlines 1 2026-05-29
SYL794 Yakutia Airlines 1 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SYL468 LED → SVX Jul 26, 13:00 UTCJul 26, 13:15 UTC15m
2026-07-24 STL479 - Jul 24, 03:20 UTCJul 24, 18:25 UTC15h 5m
2026-07-23 STL479 - Jul 23, 19:20 UTCJul 24, 18:25 UTC23h 5m
2026-07-23 STL479 - Jul 23, 18:50 UTCJul 24, 04:00 UTC9h 10m
2026-07-23 SYL465 OVB → VKO Jul 23, 04:25 UTCJul 23, 19:20 UTC14h 55m
2026-07-22 SYL465 OVB → VKO Jul 22, 19:30 UTCJul 23, 04:55 UTC9h 25m
2026-07-22 SYL453 YKS → OMS Jul 22, 03:45 UTCJul 22, 19:35 UTC15h 50m
2026-07-21 SYL453 YKS → OMS Jul 21, 09:20 UTCJul 22, 04:25 UTC19h 5m
2026-07-21 SYL453 YKS → OMS Jul 21, 09:10 UTCJul 22, 04:25 UTC19h 15m
2026-07-20 SYL485 YKS → OVB Jul 20, 20:25 UTCJul 21, 09:45 UTC13h 20m
2026-07-18 SYL479 - Jul 18, 17:00 UTCJul 18, 17:30 UTC30m
2026-07-17 SYL454 - Jul 17, 19:30 UTCJul 18, 17:30 UTC22h 1m
2026-07-17 SYL454 - Jul 17, 05:30 UTCJul 17, 20:10 UTC14h 40m
2026-07-16 SYL453 YKS → OMS Jul 16, 20:19 UTCJul 17, 06:05 UTC9h 45m
2026-07-10 SYL473 - Jul 10, 15:20 UTCJul 11, 04:15 UTC12h 55m
2026-07-10 SYL487 - Jul 10, 09:35 UTCJul 10, 11:25 UTC1h 50m
2026-07-09 SYL487 - Jul 9, 11:20 UTCJul 10, 11:15 UTC23h 55m
2026-07-09 SYL487 - Jul 9, 09:40 UTCJul 9, 12:15 UTC2h 35m
2026-07-07 SYL487 - Jul 7, 09:20 UTCJul 8, 04:10 UTC18h 50m
2026-07-07 SYL487 - Jul 7, 09:05 UTCJul 8, 04:10 UTC19h 5m
2026-07-06 SYL487 - Jul 6, 21:20 UTCJul 7, 16:25 UTC19h 5m
2026-07-06 SYL487 - Jul 6, 20:45 UTCJul 7, 16:25 UTC19h 40m
2026-07-06 SYL487 - Jul 6, 11:45 UTCJul 7, 11:00 UTC23h 15m
2026-07-06 SYL473 - Jul 6, 04:35 UTCJul 6, 21:55 UTC17h 20m
2026-07-05 SYL473 - Jul 5, 14:15 UTCJul 6, 06:10 UTC15h 55m
2026-07-02 SYL487 - Jul 2, 10:20 UTCJul 3, 03:35 UTC17h 15m
2026-07-01 SYL487 - Jul 1, 19:30 UTCJul 2, 11:20 UTC15h 50m
2026-07-01 SYL454 - Jul 1, 04:15 UTCJul 1, 19:35 UTC15h 20m
2026-06-30 SYL286 - Jun 30, 19:40 UTCJul 1, 04:20 UTC8h 40m
2026-06-30 SYL9915 - Jun 30, 05:55 UTCJun 30, 17:50 UTC11h 55m
2026-06-30 SYL285 - Jun 30, 03:30 UTCJun 30, 04:05 UTC35m
2026-06-26 SYL479 - Jun 26, 02:44 UTCJun 26, 19:39 UTC16h 55m
2026-06-24 SYL453 - Jun 24, 03:44 UTCJun 24, 19:39 UTC15h 55m
2026-06-23 SYL453 - Jun 23, 16:54 UTCJun 24, 10:04 UTC17h 10m
2026-06-23 SYL736 YKS → VKO Jun 23, 14:44 UTCJun 23, 15:04 UTC20m
2026-06-23 SYL736 YKS → VKO Jun 23, 12:29 UTCJun 23, 13:59 UTC1h 30m
2026-06-22 SYL736 YKS → VKO Jun 22, 14:14 UTCJun 23, 13:09 UTC22h 55m
2026-06-21 SYL475 - Jun 21, 05:59 UTCJun 21, 06:29 UTC30m
2026-06-19 SYL488 LED → YKS Jun 19, 16:29 UTCJun 20, 12:04 UTC19h 35m
2026-06-19 SYL487 - Jun 19, 03:15 UTCJun 19, 14:04 UTC10h 50m
2026-06-18 SYL9915 - Jun 18, 11:00 UTCJun 19, 01:10 UTC14h 9m
2026-06-16 SYL475 - Jun 16, 15:35 UTCJun 17, 04:15 UTC12h 41m
2026-06-16 SYL475 - Jun 16, 08:25 UTCJun 17, 04:15 UTC19h 51m
2026-06-15 SYL487 YKS → LED Jun 15, 18:45 UTCJun 16, 15:55 UTC21h 10m
2026-06-15 SYL474 AER → VKO Jun 15, 13:34 UTCJun 16, 08:55 UTC19h 20m
2026-06-15 SYL474 AER → VKO Jun 15, 07:40 UTCJun 15, 19:10 UTC11h 30m
2026-06-15 SYL473 VKO → AER Jun 15, 03:35 UTCJun 15, 05:00 UTC1h 25m
2026-06-14 SYL468 LED → SVX Jun 14, 13:00 UTCJun 14, 13:10 UTC10m
2026-06-13 SYL474 AER → VKO Jun 13, 17:25 UTCJun 13, 19:35 UTC2h 10m
2026-06-12 SYL488 LED → YKS Jun 12, 10:25 UTCJun 13, 04:30 UTC18h 4m

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-73261 page for operator, model, and routing details .

Mode-S 151E2D frequently asked

What is Mode-S code 151E2D?
151E2D is an ICAO 24-bit transponder address. Allocated to Russia. Assigned to RA-73261.
Where is Mode-S 151E2D registered?
Mode-S code 151E2D is allocated to Russia (RU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 151E2D broadcasting right now?
No active broadcast right now. Last signal was 13d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 151E2D, octal 05217055, decimal 1,383,981.
What flights does 151E2D operate?
Mode-S 151E2D has broadcast 20 distinct callsigns, including SYL487, SYL736, SYL473, SYL476, SYL453.