Apparatus

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sensors Mode-S transponder

451D8C

ICAO 24-bit transponder address · allocated to Bulgaria

Currently assigned to LZ-BUR · EMBRAER ERJ-190-100

Hex
451D8C
Octal
21216614
Decimal
4,529,548
Country
BG
Tail
LZ-BUR
Type
E190
No current signal · last broadcast 2h ago
Flights observed
270
Distinct callsigns
20
Country
BG
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 451D8C.

Country allocation

The ICAO 24-bit address 451D8C 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
ASL75K - 15 2026-07-12
ASL20T - 15 2026-07-12
ASL80T - 11 2026-07-13
ASL47C Spurling Aviation 11 2026-07-13
ASL66K - 10 2026-07-07
ASL14B - 10 2026-07-07
ASL427 - 8 2026-07-12
ASL426 - 8 2026-07-11
ASL87M - 7 2026-07-03
ASL99V - 6 2026-07-04
ASL96M - 6 2026-07-05
ASL58V - 6 2026-07-13
ASL39W - 6 2026-06-26
ASL38Y - 6 2026-07-10
ASL35V - 6 2026-07-05
ASL32P Spurling Aviation 6 2026-07-10
ASL30E - 6 2026-06-26
ASL16G - 6 2026-07-13
ASL79H - 5 2026-07-09
ASL30R - 5 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 ASL81R TIV → BEG Jul 13, 19:40 UTCJul 13, 21:25 UTC1h 45m
2026-07-13 ASL85C - Jul 13, 16:30 UTCJul 13, 18:35 UTC2h 5m
2026-07-13 ASL80T - Jul 13, 13:10 UTCJul 13, 14:00 UTC50m
2026-07-13 ASL47C VAR → BEG Jul 13, 11:20 UTCJul 13, 12:05 UTC45m
2026-07-13 ASL16G MXP → BEG Jul 13, 07:30 UTCJul 13, 08:50 UTC1h 20m
2026-07-13 ASL58V BEG → MXP Jul 13, 05:05 UTCJul 13, 06:30 UTC1h 25m
2026-07-12 ASL75K FRA → BEG Jul 12, 18:40 UTCJul 12, 20:01 UTC1h 20m
2026-07-12 ASL20T BEG → FRA Jul 12, 15:35 UTCJul 12, 17:20 UTC1h 45m
2026-07-12 ASL80T - Jul 12, 13:15 UTCJul 12, 14:05 UTC50m
2026-07-12 ASL47C VAR → BEG Jul 12, 11:30 UTCJul 12, 12:15 UTC45m
2026-07-12 ASL427 - Jul 12, 01:30 UTCJul 12, 02:40 UTC1h 10m
2026-07-11 ASL426 - Jul 11, 23:05 UTCJul 12, 00:20 UTC1h 15m
2026-07-11 ASL47P SOF → BEG Jul 11, 13:20 UTCJul 11, 14:00 UTC40m
2026-07-11 ASL26X BEG → SOF Jul 11, 11:30 UTCJul 11, 12:00 UTC30m
2026-07-11 ASL16G MXP → BEG Jul 11, 07:50 UTCJul 11, 09:05 UTC1h 15m
2026-07-11 ASL58V - Jul 11, 04:50 UTCJul 11, 06:15 UTC1h 25m
2026-07-10 ASL75K FRA → BEG Jul 10, 19:10 UTCJul 10, 20:30 UTC1h 20m
2026-07-10 ASL20T BEG → FRA Jul 10, 15:40 UTCJul 10, 17:35 UTC1h 55m
2026-07-10 ASL32P BEG → LCA Jul 10, 13:50 UTCJul 10, 14:20 UTC30m
2026-07-10 ASL38Y - Jul 10, 11:45 UTCJul 10, 12:15 UTC30m
2026-07-10 ASL72T HAJ → BEG Jul 10, 07:30 UTCJul 10, 09:00 UTC1h 30m
2026-07-10 ASL99J BEG → HAJ Jul 10, 04:40 UTCJul 10, 06:30 UTC1h 50m
2026-07-10 ASL427 - Jul 10, 01:40 UTCJul 10, 03:00 UTC1h 20m
2026-07-09 ASL426 - Jul 9, 23:05 UTCJul 10, 00:10 UTC1h 5m
2026-07-09 ASL64P BEG → CPH Jul 9, 18:55 UTCJul 9, 20:35 UTC1h 40m
2026-07-09 ASL78P BEG → CHQ Jul 9, 15:35 UTCJul 9, 17:45 UTC2h 10m
2026-07-09 ASL80T - Jul 9, 13:10 UTCJul 9, 14:00 UTC50m
2026-07-09 ASL47C VAR → BEG Jul 9, 11:25 UTCJul 9, 12:10 UTC45m
2026-07-09 ASL30R FRA → BEG Jul 9, 08:20 UTCJul 9, 09:50 UTC1h 30m
2026-07-09 ASL79H BEG → FRA Jul 9, 05:10 UTCJul 9, 07:00 UTC1h 50m
2026-07-08 ASL75K FRA → BEG Jul 8, 18:50 UTCJul 8, 20:15 UTC1h 25m
2026-07-08 ASL20T BEG → FRA Jul 8, 15:40 UTCJul 8, 17:25 UTC1h 45m
2026-07-08 ASL32P BEG → LCA Jul 8, 13:45 UTCJul 8, 14:15 UTC30m
2026-07-08 ASL38Y - Jul 8, 11:35 UTCJul 8, 12:00 UTC25m
2026-07-07 ASL75K FRA → BEG Jul 7, 18:25 UTCJul 7, 19:50 UTC1h 25m
2026-07-07 ASL20T BEG → FRA Jul 7, 15:35 UTCJul 7, 17:15 UTC1h 40m
2026-07-07 ASL32P BEG → LCA Jul 7, 13:45 UTCJul 7, 14:20 UTC35m
2026-07-07 ASL38Y - Jul 7, 11:50 UTCJul 7, 12:15 UTC25m
2026-07-07 ASL66K - Jul 7, 07:55 UTCJul 7, 09:40 UTC1h 45m
2026-07-07 ASL14B - Jul 7, 04:45 UTCJul 7, 06:45 UTC2h 0m
2026-07-06 ASL62R - Jul 6, 14:15 UTCJul 6, 15:20 UTC1h 5m
2026-07-06 ASL34F - Jul 6, 11:35 UTCJul 6, 12:30 UTC55m
2026-07-06 ASL30R FRA → BEG Jul 6, 08:45 UTCJul 6, 10:10 UTC1h 25m
2026-07-06 ASL79H BEG → FRA Jul 6, 05:15 UTCJul 6, 06:55 UTC1h 40m
2026-07-05 ASL16J CPH → BEG Jul 5, 18:35 UTCJul 5, 20:20 UTC1h 45m
2026-07-05 ASL19H BEG → CPH Jul 5, 15:30 UTCJul 5, 17:30 UTC2h 0m
2026-07-05 ASL35V - Jul 5, 13:30 UTCJul 5, 13:55 UTC25m
2026-07-05 ASL96M - Jul 5, 11:50 UTCJul 5, 12:10 UTC20m
2026-07-04 ASL75K FRA → BEG Jul 4, 18:50 UTCJul 4, 20:05 UTC1h 15m
2026-07-04 ASL20T BEG → FRA Jul 4, 15:35 UTCJul 4, 17:20 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-BUR page for operator, model, and routing details .

Mode-S 451D8C frequently asked

What is Mode-S code 451D8C?
451D8C is an ICAO 24-bit transponder address. Allocated to Bulgaria. Assigned to LZ-BUR.
Where is Mode-S 451D8C registered?
Mode-S code 451D8C is allocated to Bulgaria (BG). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 451D8C broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 451D8C, octal 21216614, decimal 4,529,548.
What flights does 451D8C operate?
Mode-S 451D8C has broadcast 20 distinct callsigns, including ASL75K, ASL20T, ASL80T, ASL47C, ASL66K.