Apparatus

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sensors Mode-S transponder

451E8C

ICAO 24-bit transponder address · allocated to Bulgaria

Currently assigned to LZ-FBB · AIRBUS A-319

Hex
451E8C
Octal
21217214
Decimal
4,529,804
Country
BG
Tail
LZ-FBB
Type
A319
No current signal · last broadcast 5h ago
Flights observed
212
Distinct callsigns
20
Country
BG
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 451E8C.

Country allocation

The ICAO 24-bit address 451E8C 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
GPX7NC - 27 2026-07-12
GPX7CN GP Aviation 27 2026-07-12
GPX4GL - 12 2026-07-02
GPX4LG - 11 2026-07-02
GPX7JE - 10 2026-07-01
GPX7EJ - 10 2026-07-01
GPX7861 GP Aviation 7 2026-05-31
GPX7860 GP Aviation 7 2026-05-31
GPX9ZH GP Aviation 6 2026-07-12
GPX9HZ GP Aviation 6 2026-07-12
GPX6UC - 5 2026-06-09
GPX6CU GP Aviation 5 2026-06-09
GPX4HG - 5 2026-07-11
GPX4GH GP Aviation 5 2026-07-11
GPX3XJ - 5 2026-05-17
GPX3JX - 5 2026-05-17
GPX5ZP - 3 2026-07-10
GPX5PZ - 3 2026-07-10
GPX7960 GP Aviation 2 2026-05-24
GPX7871 - 2 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 GPX1731 - Jul 13, 19:25 UTCJul 13, 21:15 UTC1h 50m
2026-07-13 GPX1730 - Jul 13, 15:15 UTCJul 13, 17:35 UTC2h 20m
2026-07-13 GPX1815 - Jul 13, 12:10 UTCJul 13, 13:35 UTC1h 25m
2026-07-13 GPX1814 - Jul 13, 08:45 UTCJul 13, 10:35 UTC1h 50m
2026-07-13 GPX1471 - Jul 13, 05:10 UTCJul 13, 07:10 UTC2h 0m
2026-07-13 GPX1470 - Jul 13, 01:05 UTCJul 13, 03:25 UTC2h 20m
2026-07-12 GPX7NC - Jul 12, 19:45 UTCJul 12, 21:25 UTC1h 40m
2026-07-12 GPX7CN PRN → LUX Jul 12, 16:10 UTCJul 12, 18:20 UTC2h 10m
2026-07-12 GPX9HZ SZG → PRN Jul 12, 13:40 UTCJul 12, 14:40 UTC1h 0m
2026-07-12 GPX9ZH PRN → SZG Jul 12, 11:01 UTCJul 12, 12:20 UTC1h 20m
2026-07-12 GPX7871 - Jul 12, 08:01 UTCJul 12, 09:30 UTC1h 30m
2026-07-12 GPX7870 - Jul 12, 03:45 UTCJul 12, 05:40 UTC1h 55m
2026-07-11 GPX6261 - Jul 11, 18:50 UTCJul 11, 20:35 UTC1h 45m
2026-07-11 GPX6260 - Jul 11, 15:45 UTCJul 11, 17:45 UTC2h 0m
2026-07-11 GPX4GH HAM → HAM Jul 11, 12:30 UTCJul 11, 14:15 UTC1h 45m
2026-07-11 GPX4HG - Jul 11, 08:15 UTCJul 11, 10:20 UTC2h 5m
2026-07-10 GPX5ZP - Jul 10, 19:05 UTCJul 10, 20:25 UTC1h 20m
2026-07-10 GPX5PZ - Jul 10, 16:15 UTCJul 10, 18:00 UTC1h 45m
2026-07-10 GPX5871 - Jul 10, 11:40 UTCJul 10, 13:05 UTC1h 25m
2026-07-10 GPX5870 - Jul 10, 08:15 UTCJul 10, 10:05 UTC1h 50m
2026-07-10 GPX5471 - Jul 10, 05:05 UTCJul 10, 07:05 UTC2h 0m
2026-07-10 GPX5470 - Jul 10, 01:10 UTCJul 10, 03:45 UTC2h 35m
2026-07-09 GPX7NC - Jul 9, 21:35 UTCJul 9, 23:10 UTC1h 35m
2026-07-09 GPX7CN PRN → LUX Jul 9, 18:10 UTCJul 9, 20:10 UTC2h 0m
2026-07-08 GPX6YN - Jul 8, 19:15 UTCJul 8, 20:35 UTC1h 20m
2026-07-08 GPX6NY - Jul 8, 16:20 UTCJul 8, 18:05 UTC1h 45m
2026-07-08 GPX4GH HAM → HAM Jul 8, 13:25 UTCJul 8, 15:00 UTC1h 35m
2026-07-08 GPX4HG - Jul 8, 08:50 UTCJul 8, 11:10 UTC2h 20m
2026-07-08 GPX1949 - Jul 8, 05:45 UTCJul 8, 07:35 UTC1h 50m
2026-07-08 GPX1948 - Jul 8, 02:40 UTCJul 8, 04:50 UTC2h 10m
2026-07-07 GPX7NC - Jul 7, 19:20 UTCJul 7, 21:00 UTC1h 40m
2026-07-07 GPX7CN PRN → LUX Jul 7, 15:55 UTCJul 7, 18:05 UTC2h 10m
2026-07-06 GPX1731 - Jul 6, 18:40 UTCJul 6, 20:30 UTC1h 50m
2026-07-06 GPX1730 - Jul 6, 15:20 UTCJul 6, 17:30 UTC2h 10m
2026-07-06 GPX1815 - Jul 6, 12:30 UTCJul 6, 13:55 UTC1h 25m
2026-07-06 GPX1814 - Jul 6, 09:00 UTCJul 6, 10:45 UTC1h 45m
2026-07-06 GPX1471 - Jul 6, 05:10 UTCJul 6, 07:15 UTC2h 5m
2026-07-06 GPX1470 - Jul 6, 01:20 UTCJul 6, 03:55 UTC2h 35m
2026-07-05 GPX7NC - Jul 5, 20:20 UTCJul 5, 22:00 UTC1h 40m
2026-07-05 GPX7CN PRN → LUX Jul 5, 16:50 UTCJul 5, 18:55 UTC2h 5m
2026-07-05 GPX9HZ SZG → PRN Jul 5, 14:20 UTCJul 5, 15:20 UTC1h 0m
2026-07-05 GPX9ZH PRN → SZG Jul 5, 11:50 UTCJul 5, 13:10 UTC1h 20m
2026-07-05 GPX7871 - Jul 5, 07:25 UTCJul 5, 08:50 UTC1h 25m
2026-07-05 GPX7870 - Jul 5, 03:50 UTCJul 5, 05:50 UTC2h 0m
2026-07-04 GPX6261 - Jul 4, 18:50 UTCJul 4, 20:30 UTC1h 40m
2026-07-04 GPX6260 - Jul 4, 15:50 UTCJul 4, 17:55 UTC2h 5m
2026-07-04 GPX4GH HAM → HAM Jul 4, 12:50 UTCJul 4, 14:30 UTC1h 40m
2026-07-04 GPX4HG - Jul 4, 08:05 UTCJul 4, 10:25 UTC2h 20m
2026-07-03 GPX5ZP - Jul 3, 18:40 UTCJul 3, 19:55 UTC1h 15m
2026-07-03 GPX5PZ - Jul 3, 15:50 UTCJul 3, 17:35 UTC1h 45m

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

Mode-S 451E8C frequently asked

What is Mode-S code 451E8C?
451E8C is an ICAO 24-bit transponder address. Allocated to Bulgaria. Assigned to LZ-FBB.
Where is Mode-S 451E8C registered?
Mode-S code 451E8C is allocated to Bulgaria (BG). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 451E8C broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 451E8C, octal 21217214, decimal 4,529,804.
What flights does 451E8C operate?
Mode-S 451E8C has broadcast 20 distinct callsigns, including GPX7NC, GPX7CN, GPX4GL, GPX4LG, GPX7JE.