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
Broadcasting now · callsign BCS17D · 11,950 ft
Flights observed
95
Distinct callsigns
10
Country
BG
Last broadcast
1h ago

Current position

452101 is currently broadcasting. Map zoomed to live position.

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 10 distinct

Callsign Airline Flights Last seen
SWT9ER - 14 2026-04-30
SWT3WZ - 13 2026-05-01
BCS3165 European Air Transport 13 2026-06-02
BCS3164 European Air Transport 13 2026-06-02
BCS17D European Air Transport 12 2026-06-01
BCS3KC European Air Transport 10 2026-06-01
BCS7NC European Air Transport 9 2026-06-02
BCS20X European Air Transport 9 2026-06-02
BCS857 European Air Transport 1 2026-05-22
ADZ775P - 1 2026-05-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 BCS3165 BGO → SVG Jun 2, 17:20 UTCJun 2, 17:40 UTC20m
2026-06-02 BCS3164 SVG → BGO Jun 2, 07:15 UTCJun 2, 07:40 UTC25m
2026-06-02 BCS20X CPH → SVG Jun 2, 05:25 UTCJun 2, 06:20 UTC55m
2026-06-02 BCS7NC BRU → CPH Jun 2, 00:15 UTCJun 2, 01:20 UTC1h 5m
2026-06-01 BCS3KC CPH → BRU Jun 1, 21:50 UTCJun 1, 23:00 UTC1h 10m
2026-06-01 BCS17D SVG → CPH Jun 1, 18:35 UTCJun 1, 19:25 UTC50m
2026-06-01 BCS3165 BGO → SVG Jun 1, 17:05 UTCJun 1, 17:20 UTC15m
2026-06-01 BCS3164 SVG → BGO Jun 1, 04:05 UTCJun 1, 05:10 UTC1h 5m
2026-05-29 BCS17D SVG → CPH May 29, 18:30 UTCMay 29, 19:20 UTC50m
2026-05-29 BCS3165 BGO → SVG May 29, 17:20 UTCMay 29, 17:40 UTC20m
2026-05-29 BCS3164 SVG → BGO May 29, 07:20 UTCMay 29, 07:55 UTC35m
2026-05-29 BCS20X CPH → SVG May 29, 05:25 UTCMay 29, 06:25 UTC1h 0m
2026-05-29 BCS7NC BRU → CPH May 29, 01:15 UTCMay 29, 02:20 UTC1h 5m
2026-05-28 BCS3KC CPH → BRU May 28, 21:50 UTCMay 28, 22:55 UTC1h 5m
2026-05-28 BCS17D SVG → CPH May 28, 18:20 UTCMay 28, 19:10 UTC50m
2026-05-28 BCS3165 BGO → SVG May 28, 17:15 UTCMay 28, 17:40 UTC25m
2026-05-28 BCS3164 SVG → BGO May 28, 07:15 UTCMay 28, 07:40 UTC25m
2026-05-28 BCS20X CPH → SVG May 28, 05:25 UTCMay 28, 06:20 UTC55m
2026-05-28 BCS7NC BRU → CPH May 28, 01:10 UTCMay 28, 02:20 UTC1h 10m
2026-05-27 BCS3KC CPH → BRU May 27, 21:50 UTCMay 27, 23:00 UTC1h 10m
2026-05-27 BCS17D SVG → CPH May 27, 18:20 UTCMay 27, 19:05 UTC45m
2026-05-27 BCS3165 BGO → SVG May 27, 17:05 UTCMay 27, 17:20 UTC15m
2026-05-27 BCS3164 SVG → BGO May 27, 07:30 UTCMay 27, 08:10 UTC40m
2026-05-27 BCS20X CPH → SVG May 27, 05:24 UTCMay 27, 06:29 UTC1h 5m
2026-05-27 BCS7NC BRU → CPH May 27, 01:09 UTCMay 27, 02:14 UTC1h 5m
2026-05-26 BCS3KC CPH → BRU May 26, 21:49 UTCMay 26, 22:59 UTC1h 10m
2026-05-26 BCS17D SVG → CPH May 26, 18:40 UTCMay 26, 19:30 UTC50m
2026-05-26 BCS3165 BGO → SVG May 26, 17:09 UTCMay 26, 17:35 UTC25m
2026-05-26 BCS3164 SVG → BGO May 26, 05:59 UTCMay 26, 07:10 UTC1h 10m
2026-05-22 BCS17D SVG → CPH May 22, 18:25 UTCMay 22, 19:05 UTC40m
2026-05-22 BCS3165 BGO → SVG May 22, 17:15 UTCMay 22, 17:30 UTC15m
2026-05-22 BCS3164 SVG → BGO May 22, 07:20 UTCMay 22, 07:50 UTC30m
2026-05-22 BCS20X CPH → SVG May 22, 05:30 UTCMay 22, 06:25 UTC55m
2026-05-22 BCS857 LEJ → EMA May 22, 03:10 UTCMay 22, 04:15 UTC1h 5m
2026-05-21 BCS3KC CPH → BRU May 21, 23:35 UTCMay 22, 00:40 UTC1h 5m
2026-05-21 BCS17D SVG → CPH May 21, 18:20 UTCMay 21, 19:10 UTC50m
2026-05-21 BCS3165 BGO → SVG May 21, 17:10 UTCMay 21, 17:30 UTC20m
2026-05-21 BCS3164 SVG → BGO May 21, 07:25 UTCMay 21, 07:55 UTC30m
2026-05-21 BCS20X CPH → SVG May 21, 05:40 UTCMay 21, 06:40 UTC1h 0m
2026-05-21 BCS7NC BRU → CPH May 21, 01:20 UTCMay 21, 02:30 UTC1h 10m
2026-05-20 BCS3KC CPH → BRU May 20, 22:00 UTCMay 20, 23:05 UTC1h 5m
2026-05-20 BCS17D SVG → CPH May 20, 18:20 UTCMay 20, 19:10 UTC50m
2026-05-20 BCS3165 BGO → SVG May 20, 17:10 UTCMay 20, 17:30 UTC20m
2026-05-20 BCS3164 SVG → BGO May 20, 07:15 UTCMay 20, 07:45 UTC30m
2026-05-20 BCS20X CPH → SVG May 20, 05:25 UTCMay 20, 06:20 UTC55m
2026-05-20 BCS7NC BRU → CPH May 20, 01:15 UTCMay 20, 02:25 UTC1h 10m
2026-05-19 BCS3KC CPH → BRU May 19, 21:50 UTCMay 19, 23:00 UTC1h 10m
2026-05-19 BCS17D SVG → CPH May 19, 18:30 UTCMay 19, 19:20 UTC50m
2026-05-19 BCS3165 BGO → SVG May 19, 17:20 UTCMay 19, 17:35 UTC15m
2026-05-19 BCS3164 SVG → BGO May 19, 07:10 UTCMay 19, 07:35 UTC25m

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?
Yes. Mode-S 452101 is currently airborne.
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 10 distinct callsigns, including SWT9ER, SWT3WZ, BCS3165, BCS3164, BCS17D.