Apparatus

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sensors Mode-S transponder

451D85

ICAO 24-bit transponder address · allocated to Bulgaria

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

Hex
451D85
Octal
21216605
Decimal
4,529,541
Country
BG
Tail
LZ-SOF
Type
E190
Transponder active on ground
Flights observed
525
Distinct callsigns
20
Country
BG
Last broadcast
Jul 26, 20:40 UTC

Last known position

Most recent position reported by Mode-S 451D85.

Country allocation

The ICAO 24-bit address 451D85 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
ASL80T - 24 2026-07-16
ASL47C Spurling Aviation 24 2026-07-16
ASL75K - 22 2026-07-21
ASL20T - 22 2026-07-21
ASL87M - 21 2026-07-23
ASL99V - 19 2026-07-24
ASL79H Spurling Aviation 19 2026-07-23
ASL30R - 19 2026-07-23
ASL96M - 16 2026-07-10
ASL35V - 15 2026-07-10
ASL64T Spurling Aviation 12 2026-07-23
ASL58V - 12 2026-07-18
ASL46G - 12 2026-07-23
ASL85C - 11 2026-07-06
ASL81R Spurling Aviation 11 2026-07-06
ASL56V Spurling Aviation 11 2026-07-26
ASL51C Spurling Aviation 11 2026-07-26
ASL16G - 11 2026-07-18
ASL71B - 10 2026-07-20
ASL70J - 10 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASL51C VLC → BEG Jul 26, 18:50 UTCJul 26, 20:35 UTC1h 45m
2026-07-26 ASL56V LCA → BEG Jul 26, 16:00 UTCJul 26, 17:50 UTC1h 50m
2026-07-26 ASL32P BEG → LCA Jul 26, 14:15 UTCJul 26, 14:35 UTC20m
2026-07-26 ASL38Y - Jul 26, 11:50 UTCJul 26, 12:05 UTC15m
2026-07-25 ASL87Q SKP → BEG Jul 25, 13:55 UTCJul 25, 14:35 UTC40m
2026-07-25 ASL56C FCO → BEG Jul 25, 12:05 UTCJul 25, 12:35 UTC30m
2026-07-25 ASL66K CPH → BEG Jul 25, 08:15 UTCJul 25, 10:00 UTC1h 45m
2026-07-25 ASL14B BEG → CPH Jul 25, 04:50 UTCJul 25, 06:50 UTC2h 0m
2026-07-24 ASL66N - Jul 24, 20:30 UTCJul 24, 22:25 UTC1h 55m
2026-07-24 ASL29G BEG → VCE Jul 24, 17:15 UTCJul 24, 19:30 UTC2h 15m
2026-07-24 ASL62R - Jul 24, 14:45 UTCJul 24, 15:45 UTC1h 0m
2026-07-24 ASL34F - Jul 24, 11:45 UTCJul 24, 12:50 UTC1h 5m
2026-07-24 ASL11J NUE → BEG Jul 24, 09:00 UTCJul 24, 10:15 UTC1h 15m
2026-07-24 ASL76Q BLQ → BEG Jul 24, 05:10 UTCJul 24, 06:35 UTC1h 25m
2026-07-24 ASL99V ATH → BEG Jul 24, 01:35 UTCJul 24, 02:50 UTC1h 15m
2026-07-23 ASL87M BEG → ATH Jul 23, 22:55 UTCJul 24, 00:10 UTC1h 15m
2026-07-23 ASL64T SKG → BEG Jul 23, 13:40 UTCJul 23, 14:35 UTC55m
2026-07-23 ASL46G BEG → SKG Jul 23, 11:50 UTCJul 23, 12:45 UTC55m
2026-07-23 ASL30R FRA → BEG Jul 23, 08:35 UTCJul 23, 09:55 UTC1h 20m
2026-07-23 ASL79H INI → BEG Jul 23, 05:05 UTCJul 23, 06:50 UTC1h 45m
2026-07-22 ASL43N - Jul 22, 19:20 UTCJul 22, 20:40 UTC1h 20m
2026-07-22 ASL14G BEG → LHR Jul 22, 16:30 UTCJul 22, 17:55 UTC1h 25m
2026-07-21 ASL75K FRA → BEG Jul 21, 19:10 UTCJul 21, 20:35 UTC1h 25m
2026-07-21 ASL20T BEG → FRA Jul 21, 16:05 UTCJul 21, 17:50 UTC1h 45m
2026-07-20 ASL75K FRA → BEG Jul 20, 18:50 UTCJul 20, 20:10 UTC1h 20m
2026-07-20 ASL20T BEG → FRA Jul 20, 15:50 UTCJul 20, 17:35 UTC1h 45m
2026-07-20 ASL49H ZRH → BEG Jul 20, 14:15 UTCJul 20, 14:45 UTC30m
2026-07-20 ASL81C BEG → SJJ Jul 20, 12:40 UTCJul 20, 13:05 UTC25m
2026-07-20 ASL71B ATH → BEG Jul 20, 07:20 UTCJul 20, 08:35 UTC1h 15m
2026-07-20 ASL70J BEG → ATH Jul 20, 04:35 UTCJul 20, 05:50 UTC1h 15m
2026-07-20 ASL99V ATH → BEG Jul 20, 01:45 UTCJul 20, 03:05 UTC1h 20m
2026-07-19 ASL87M BEG → ATH Jul 19, 23:35 UTCJul 20, 00:50 UTC1h 15m
2026-07-18 ASL32P BEG → LCA Jul 18, 14:20 UTCJul 18, 14:50 UTC30m
2026-07-18 ASL38Y - Jul 18, 12:10 UTCJul 18, 12:35 UTC25m
2026-07-18 ASL16G MXP → BEG Jul 18, 07:45 UTCJul 18, 09:05 UTC1h 20m
2026-07-18 ASL58V BEG → MXP Jul 18, 05:05 UTCJul 18, 06:40 UTC1h 35m
2026-07-17 ASL51C VLC → BEG Jul 17, 18:55 UTCJul 17, 20:35 UTC1h 40m
2026-07-17 ASL56V LCA → BEG Jul 17, 16:00 UTCJul 17, 17:50 UTC1h 50m
2026-07-17 ASL49H ZRH → BEG Jul 17, 13:20 UTCJul 17, 13:40 UTC20m
2026-07-17 ASL81C BEG → SJJ Jul 17, 12:00 UTCJul 17, 12:19 UTC20m
2026-07-17 ASL39W - Jul 17, 08:15 UTCJul 17, 10:00 UTC1h 45m
2026-07-17 ASL30E BEG → MAD Jul 17, 04:54 UTCJul 17, 07:05 UTC2h 10m
2026-07-17 ASL99V ATH → BEG Jul 17, 01:35 UTCJul 17, 02:54 UTC1h 20m
2026-07-16 ASL87M BEG → ATH Jul 16, 22:49 UTCJul 16, 23:59 UTC1h 10m
2026-07-16 ASL88B STR → BEG Jul 16, 19:20 UTCJul 16, 20:55 UTC1h 35m
2026-07-16 ASL99K BEG → STR Jul 16, 16:40 UTCJul 16, 18:15 UTC1h 35m
2026-07-16 ASL80T - Jul 16, 14:20 UTCJul 16, 15:05 UTC45m
2026-07-16 ASL47C VAR → BEG Jul 16, 12:14 UTCJul 16, 13:05 UTC50m
2026-07-16 ASL19P BER → BEG Jul 16, 07:45 UTCJul 16, 09:15 UTC1h 30m
2026-07-16 ASL94D BEG → BER Jul 16, 04:55 UTCJul 16, 06:20 UTC1h 25m

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

Mode-S 451D85 frequently asked

What is Mode-S code 451D85?
451D85 is an ICAO 24-bit transponder address. Allocated to Bulgaria. Assigned to LZ-SOF.
Where is Mode-S 451D85 registered?
Mode-S code 451D85 is allocated to Bulgaria (BG). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 451D85 broadcasting right now?
Mode-S 451D85 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 451D85, octal 21216605, decimal 4,529,541.
What flights does 451D85 operate?
Mode-S 451D85 has broadcast 20 distinct callsigns, including ASL80T, ASL47C, ASL75K, ASL20T, ASL87M.