Apparatus

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sensors Mode-S transponder

452101

ICAO 24-bit transponder address · allocated to Bulgaria

Currently assigned to LZ-CXB · BOEING 737-800

Hex
452101
Octal
21220401
Decimal
4,530,433
Country
BG
Tail
LZ-CXB
Type
B738
No current signal · last broadcast Jul 24, 20:55 UTC
Flights observed
225
Distinct callsigns
20
Country
BG
Last broadcast
Jul 24, 20:55 UTC

Last known position

Most recent position reported by Mode-S 452101.

Country allocation

The ICAO 24-bit address 452101 falls within the block assigned to Bulgaria (BG) by ICAO Annex 10, Volume III. Every aircraft registered in Bulgaria 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
BCS3165 European Air Transport 28 2026-07-20
BCS3164 - 28 2026-07-20
BCS17D European Air Transport 28 2026-07-20
BCS3KC - 21 2026-06-18
BCS7NC - 20 2026-06-19
BCS20X - 20 2026-06-19
SWT9ER - 14 2026-04-30
ADZ5959 - 14 2026-07-23
SWT3WZ - 13 2026-05-01
ADZ5961 Compass Cargo Airlines 12 2026-07-23
MSA9766 - 6 2026-06-30
MSA65P - 5 2026-06-29
ADZ71R - 2 2026-07-03
ADZ6810 - 2 2026-07-24
ADZ6809 - 2 2026-07-24
ADZ5868 - 2 2026-07-13
ADZ5867 - 2 2026-07-13
MSA9767 - 1 2026-06-30
BCS872 European Air Transport 1 2026-07-19
BCS857 European Air Transport 1 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 ADZ6809 - Jul 24, 19:50 UTCJul 24, 20:45 UTC55m
2026-07-24 ADZ6809 - Jul 24, 16:15 UTCJul 24, 18:35 UTC2h 20m
2026-07-24 ADZ6810 - Jul 24, 05:00 UTCJul 24, 08:05 UTC3h 5m
2026-07-24 ADZ6810 CGN → BLL Jul 24, 03:05 UTCJul 24, 04:00 UTC55m
2026-07-23 ADZ6800 LEJ → CGN Jul 23, 23:10 UTCJul 23, 23:45 UTC35m
2026-07-23 ADZ5961 VNO → LEJ Jul 23, 18:35 UTCJul 23, 20:00 UTC1h 25m
2026-07-23 ADZ5959 LEJ → VNO Jul 23, 03:20 UTCJul 23, 04:40 UTC1h 20m
2026-07-22 ADZ5961 VNO → LEJ Jul 22, 18:45 UTCJul 22, 20:15 UTC1h 30m
2026-07-22 ADZ5959 - Jul 22, 03:20 UTCJul 22, 04:40 UTC1h 20m
2026-07-21 ADZ5961 - Jul 21, 18:45 UTCJul 21, 20:15 UTC1h 30m
2026-07-21 ADZ5959 - Jul 21, 03:15 UTCJul 21, 04:40 UTC1h 25m
2026-07-20 ADZ770P BGO → BGO Jul 20, 21:45 UTCJul 20, 22:30 UTC45m
2026-07-20 BCS17D SVG → CPH Jul 20, 18:20 UTCJul 20, 19:15 UTC55m
2026-07-20 BCS3165 BGO → SVG Jul 20, 17:00 UTCJul 20, 17:25 UTC25m
2026-07-20 BCS3164 CPH → BGO Jul 20, 03:55 UTCJul 20, 04:55 UTC1h 0m
2026-07-19 BCS872 BRU → MXP Jul 19, 22:20 UTCJul 19, 23:05 UTC45m
2026-07-17 ADZ5961 VNO → LEJ Jul 17, 18:44 UTCJul 17, 20:10 UTC1h 25m
2026-07-17 ADZ5959 LEJ → VNO Jul 17, 04:20 UTCJul 17, 05:45 UTC1h 25m
2026-07-16 ADZ5961 VNO → LEJ Jul 16, 18:40 UTCJul 16, 20:09 UTC1h 30m
2026-07-16 ADZ5959 LEJ → VNO Jul 16, 03:15 UTCJul 16, 04:40 UTC1h 25m
2026-07-15 ADZ5961 - Jul 15, 18:35 UTCJul 15, 20:05 UTC1h 30m
2026-07-15 ADZ5959 LEJ → VNO Jul 15, 03:25 UTCJul 15, 04:45 UTC1h 20m
2026-07-14 ADZ5961 - Jul 14, 18:40 UTCJul 14, 20:20 UTC1h 40m
2026-07-14 ADZ5959 - Jul 14, 03:20 UTCJul 14, 04:35 UTC1h 15m
2026-07-13 ADZ5867 - Jul 13, 17:20 UTCJul 13, 18:50 UTC1h 30m
2026-07-13 ADZ5868 - Jul 13, 00:20 UTCJul 13, 01:40 UTC1h 20m
2026-07-10 ADZ5961 VNO → LEJ Jul 10, 18:35 UTCJul 10, 20:00 UTC1h 25m
2026-07-10 ADZ5959 LEJ → VNO Jul 10, 03:15 UTCJul 10, 04:40 UTC1h 25m
2026-07-09 ADZ5961 - Jul 9, 18:50 UTCJul 9, 20:15 UTC1h 25m
2026-07-09 ADZ5959 - Jul 9, 03:15 UTCJul 9, 04:40 UTC1h 25m
2026-07-08 ADZ5961 VNO → LEJ Jul 8, 18:45 UTCJul 8, 20:05 UTC1h 20m
2026-07-08 ADZ5959 LEJ → VNO Jul 8, 03:20 UTCJul 8, 04:40 UTC1h 20m
2026-07-07 ADZ5961 - Jul 7, 19:00 UTCJul 7, 20:35 UTC1h 35m
2026-07-07 ADZ5959 - Jul 7, 03:25 UTCJul 7, 04:45 UTC1h 20m
2026-07-06 ADZ5867 - Jul 6, 17:30 UTCJul 6, 19:00 UTC1h 30m
2026-07-06 ADZ5868 - Jul 6, 00:20 UTCJul 6, 01:45 UTC1h 25m
2026-07-03 ADZ71R VNO → LEJ Jul 3, 18:45 UTCJul 3, 20:15 UTC1h 30m
2026-07-03 ADZ5959 - Jul 3, 03:20 UTCJul 3, 04:30 UTC1h 10m
2026-07-02 ADZ71R VNO → LEJ Jul 2, 18:35 UTCJul 2, 20:05 UTC1h 30m
2026-07-02 ADZ5959 LEJ → VNO Jul 2, 03:15 UTCJul 2, 04:35 UTC1h 20m
2026-07-01 ADZ5961 VNO → LEJ Jul 1, 19:05 UTCJul 1, 20:30 UTC1h 25m
2026-07-01 ADZ5959 - Jul 1, 03:30 UTCJul 1, 04:45 UTC1h 15m
2026-06-30 MSA9767 - Jun 30, 04:25 UTCJun 30, 05:30 UTC1h 5m
2026-06-30 MSA9766 - Jun 30, 01:40 UTCJun 30, 02:50 UTC1h 10m
2026-06-29 MSA65P - Jun 29, 23:34 UTCJun 30, 00:39 UTC1h 5m
2026-06-29 MSA9766 - Jun 29, 01:34 UTCJun 29, 02:45 UTC1h 10m
2026-06-28 MSA65P - Jun 28, 23:14 UTCJun 29, 00:29 UTC1h 15m
2026-06-26 MSA9766 - Jun 26, 01:45 UTCJun 26, 02:50 UTC1h 5m
2026-06-25 MSA65P - Jun 25, 23:24 UTCJun 26, 00:30 UTC1h 5m
2026-06-25 MSA9766 - Jun 25, 02:19 UTCJun 25, 03:24 UTC1h 5m

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 LZ-CXB page for operator, model, and routing details .

Mode-S 452101 frequently asked

What is Mode-S code 452101?
452101 is an ICAO 24-bit transponder address. Allocated to Bulgaria. Assigned to LZ-CXB.
Where is Mode-S 452101 registered?
Mode-S code 452101 is allocated to Bulgaria (BG). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 452101 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 20:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 452101, octal 21220401, decimal 4,530,433.
What flights does 452101 operate?
Mode-S 452101 has broadcast 20 distinct callsigns, including BCS3165, BCS3164, BCS17D, BCS3KC, BCS7NC.