Apparatus

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sensors Mode-S transponder

452181

ICAO 24-bit transponder address · allocated to Bulgaria

Currently assigned to LZ-CJC · BOEING 747-400

Hex
452181
Octal
21220601
Decimal
4,530,561
Country
BG
Tail
LZ-CJC
Type
B744
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
312
Distinct callsigns
20
Country
BG
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S 452181.

Country allocation

The ICAO 24-bit address 452181 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
UAE9903 Emirates 21 2026-05-27
UAE9837 - 18 2026-06-25
UAE9781 - 18 2026-07-15
UAE9859 - 17 2026-07-12
UAE9858 - 17 2026-07-11
UAE9853 - 17 2026-07-03
UAE9836 - 16 2026-06-25
UAE9780 - 15 2026-07-14
UAE9852 - 11 2026-07-03
UAE9838 Emirates 11 2026-06-01
UAE9839 Emirates 10 2026-06-02
UAE9394 Emirates 9 2026-06-11
UAE9845 Emirates 7 2026-06-06
UAE9844 Emirates 7 2026-06-05
UAE9799 - 7 2026-06-30
UAE9791 Emirates 7 2026-06-05
UAE9393 Emirates 7 2026-06-10
UAE9847 Emirates 6 2026-06-13
UAE9798 - 6 2026-06-30
UAE9797 Emirates 6 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAE9796 DWC → HKG Jul 26, 21:55 UTCJul 26, 22:15 UTC20m
2026-07-23 UAE9390 MAD → DWC Jul 23, 10:25 UTCJul 23, 17:25 UTC7h 0m
2026-07-22 UAE9389 DWC → DWC Jul 22, 11:30 UTCJul 22, 16:10 UTC4h 40m
2026-07-22 UAE9747 DWC → LLW Jul 22, 02:30 UTCJul 22, 03:45 UTC1h 15m
2026-07-21 UAE9746 MST → ZAZ Jul 21, 22:45 UTCJul 21, 22:55 UTC10m
2026-07-20 UAE9745 NBO → MST Jul 20, 22:45 UTCJul 21, 00:25 UTC1h 39m
2026-07-20 UAE9744 - Jul 20, 20:00 UTCJul 20, 20:20 UTC20m
2026-07-20 UAE9744 - Jul 20, 18:40 UTCJul 20, 19:25 UTC45m
2026-07-20 UAE9797 HKG → DWC Jul 20, 14:55 UTCJul 20, 15:25 UTC30m
2026-07-20 UAE9797 HKG → DWC Jul 20, 08:15 UTCJul 20, 14:00 UTC5h 45m
2026-07-20 UAE9412 - Jul 20, 05:00 UTCJul 20, 05:35 UTC35m
2026-07-19 UAE9412 - Jul 19, 21:50 UTCJul 20, 03:15 UTC5h 25m
2026-07-16 UAE9392 AMS → DWC Jul 16, 15:40 UTCJul 16, 22:45 UTC7h 5m
2026-07-16 UAE9391 - Jul 16, 08:00 UTCJul 16, 11:45 UTC3h 45m
2026-07-16 UAE9391 - Jul 16, 04:45 UTCJul 16, 07:55 UTC3h 10m
2026-07-15 UAE9781 - Jul 15, 08:10 UTCJul 15, 15:05 UTC6h 55m
2026-07-14 UAE9780 - Jul 14, 21:10 UTCJul 15, 05:10 UTC7h 59m
2026-07-13 UAE9745 - Jul 13, 18:15 UTCJul 13, 23:55 UTC5h 40m
2026-07-13 UAE9797 - Jul 13, 09:55 UTCJul 13, 15:05 UTC5h 10m
2026-07-13 UAE9797 - Jul 13, 08:10 UTCJul 13, 08:25 UTC15m
2026-07-13 UAE9796 - Jul 13, 05:20 UTCJul 13, 05:55 UTC35m
2026-07-12 UAE9796 - Jul 12, 22:00 UTCJul 13, 03:30 UTC5h 30m
2026-07-12 UAE9859 - Jul 12, 10:01 UTCJul 12, 15:10 UTC5h 10m
2026-07-12 UAE9859 - Jul 12, 08:15 UTCJul 12, 08:25 UTC10m
2026-07-11 UAE9858 DWC → HKG Jul 11, 21:50 UTCJul 12, 05:45 UTC7h 55m
2026-07-06 UAE9781 - Jul 6, 09:40 UTCJul 6, 14:25 UTC4h 45m
2026-07-06 UAE9781 - Jul 6, 07:15 UTCJul 6, 07:30 UTC15m
2026-07-06 UAE9780 - Jul 6, 04:10 UTCJul 6, 04:50 UTC40m
2026-07-05 UAE9780 - Jul 5, 21:20 UTCJul 6, 02:25 UTC5h 5m
2026-07-05 UAE9859 HKG → DWC Jul 5, 06:30 UTCJul 5, 13:40 UTC7h 10m
2026-07-05 UAE9858 - Jul 5, 02:50 UTCJul 5, 03:25 UTC35m
2026-07-04 UAE9858 - Jul 4, 19:55 UTCJul 5, 02:10 UTC6h 15m
2026-07-03 UAE9853 - Jul 3, 10:30 UTCJul 3, 16:20 UTC5h 50m
2026-07-03 UAE9853 - Jul 3, 09:35 UTCJul 3, 09:50 UTC15m
2026-07-03 UAE9852 - Jul 3, 03:50 UTCJul 3, 04:30 UTC40m
2026-07-02 UAE9852 - Jul 2, 21:00 UTCJul 3, 03:10 UTC6h 10m
2026-07-02 UAE9841 - Jul 2, 08:50 UTCJul 2, 14:45 UTC5h 55m
2026-07-02 UAE9841 - Jul 2, 07:50 UTCJul 2, 08:05 UTC15m
2026-07-01 UAE9840 - Jul 1, 21:55 UTCJul 2, 05:20 UTC7h 25m
2026-07-01 UAE9859 - Jul 1, 12:00 UTCJul 1, 18:55 UTC6h 55m
2026-07-01 UAE9858 - Jul 1, 01:45 UTCJul 1, 09:10 UTC7h 25m
2026-06-30 UAE9747 - Jun 30, 17:55 UTCJun 30, 23:15 UTC5h 20m
2026-06-30 UAE9799 - Jun 30, 09:45 UTCJun 30, 15:50 UTC6h 5m
2026-06-30 UAE9799 - Jun 30, 08:50 UTCJun 30, 09:10 UTC20m
2026-06-30 UAE9798 - Jun 30, 02:50 UTCJun 30, 03:15 UTC25m
2026-06-29 UAE9798 - Jun 29, 20:00 UTCJun 30, 01:14 UTC5h 15m
2026-06-29 UAE9745 - Jun 29, 10:44 UTCJun 29, 16:04 UTC5h 20m
2026-06-29 UAE9797 - Jun 29, 00:20 UTCJun 29, 06:29 UTC6h 10m
2026-06-28 UAE9797 - Jun 28, 23:29 UTCJun 28, 23:44 UTC15m
2026-06-28 UAE9796 - Jun 28, 13:34 UTCJun 28, 20:45 UTC7h 10m

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

Mode-S 452181 frequently asked

What is Mode-S code 452181?
452181 is an ICAO 24-bit transponder address. Allocated to Bulgaria. Assigned to LZ-CJC.
Where is Mode-S 452181 registered?
Mode-S code 452181 is allocated to Bulgaria (BG). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 452181 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 452181, octal 21220601, decimal 4,530,561.
What flights does 452181 operate?
Mode-S 452181 has broadcast 20 distinct callsigns, including UAE9903, UAE9837, UAE9781, UAE9859, UAE9858.