Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
No current signal · last broadcast 3h ago
Flights observed
471
Distinct callsigns
20
Country
BG
Last broadcast
3h ago

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 - 23 2026-07-14
ASL47C Spurling Aviation 23 2026-07-14
ASL75K - 19 2026-07-05
ASL20T - 19 2026-07-05
ASL87M - 18 2026-07-12
ASL79H - 18 2026-07-07
ASL30R - 18 2026-07-07
ASL99V - 16 2026-07-13
ASL96M - 16 2026-07-10
ASL35V - 15 2026-07-10
ASL85C - 11 2026-07-06
ASL81R Spurling Aviation 11 2026-07-06
ASL64T Spurling Aviation 11 2026-07-12
ASL58V - 11 2026-07-06
ASL46G - 11 2026-07-12
ASL16G - 10 2026-07-06
ASL71B - 9 2026-07-09
ASL70J - 9 2026-07-09
ASL56V Spurling Aviation 9 2026-07-10
ASL51C Spurling Aviation 9 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASL80T - Jul 14, 13:55 UTCJul 14, 15:00 UTC1h 5m
2026-07-14 ASL47C VAR → BEG Jul 14, 12:10 UTCJul 14, 13:00 UTC50m
2026-07-14 ASL19P BER → BEG Jul 14, 09:35 UTCJul 14, 11:00 UTC1h 25m
2026-07-14 ASL94D BEG → BER Jul 14, 05:00 UTCJul 14, 06:30 UTC1h 30m
2026-07-13 ASL35C BEG → STR Jul 13, 19:05 UTCJul 13, 20:15 UTC1h 10m
2026-07-13 ASL77G CDG → BEG Jul 13, 16:40 UTCJul 13, 18:10 UTC1h 30m
2026-07-13 ASL62R - Jul 13, 14:15 UTCJul 13, 15:20 UTC1h 5m
2026-07-13 ASL34F - Jul 13, 11:30 UTCJul 13, 12:35 UTC1h 5m
2026-07-13 ASL91J - Jul 13, 07:40 UTCJul 13, 09:50 UTC2h 10m
2026-07-13 ASL32B BEG → GOT Jul 13, 04:25 UTCJul 13, 06:35 UTC2h 10m
2026-07-13 ASL99V ATH → BEG Jul 13, 01:40 UTCJul 13, 02:55 UTC1h 15m
2026-07-12 ASL87M BEG → ATH Jul 12, 22:55 UTCJul 13, 00:10 UTC1h 15m
2026-07-12 ASL44H - Jul 12, 18:50 UTCJul 12, 20:10 UTC1h 20m
2026-07-12 ASL86W BEG → BER Jul 12, 16:15 UTCJul 12, 17:45 UTC1h 30m
2026-07-12 ASL64T SKG → BEG Jul 12, 13:20 UTCJul 12, 14:15 UTC55m
2026-07-12 ASL46G BEG → SKG Jul 12, 11:25 UTCJul 12, 12:15 UTC50m
2026-07-11 ASL80T - Jul 11, 13:15 UTCJul 11, 14:10 UTC55m
2026-07-11 ASL47C VAR → BEG Jul 11, 11:25 UTCJul 11, 12:15 UTC50m
2026-07-11 ASL20K FCO → BEG Jul 11, 08:01 UTCJul 11, 09:10 UTC1h 10m
2026-07-11 ASL42A - Jul 11, 05:01 UTCJul 11, 06:15 UTC1h 15m
2026-07-10 ASL51C VLC → BEG Jul 10, 19:00 UTCJul 10, 20:40 UTC1h 40m
2026-07-10 ASL56V LCA → BEG Jul 10, 15:45 UTCJul 10, 17:40 UTC1h 55m
2026-07-10 ASL35V - Jul 10, 13:30 UTCJul 10, 14:00 UTC30m
2026-07-10 ASL96M - Jul 10, 11:55 UTCJul 10, 12:15 UTC20m
2026-07-10 ASL39W BRU → BEG Jul 10, 08:05 UTCJul 10, 09:50 UTC1h 45m
2026-07-10 ASL30E - Jul 10, 04:55 UTCJul 10, 07:05 UTC2h 10m
2026-07-10 ASL99V ATH → BEG Jul 10, 01:30 UTCJul 10, 02:55 UTC1h 25m
2026-07-09 ASL87M BEG → ATH Jul 9, 22:55 UTCJul 10, 00:00 UTC1h 5m
2026-07-09 ASL53E ZRH → BEG Jul 9, 13:25 UTCJul 9, 14:45 UTC1h 20m
2026-07-09 ASL27D BEG → ZRH Jul 9, 10:50 UTCJul 9, 12:20 UTC1h 30m
2026-07-09 ASL71B ATH → BEG Jul 9, 08:20 UTCJul 9, 09:40 UTC1h 20m
2026-07-09 ASL70J BEG → ATH Jul 9, 05:45 UTCJul 9, 07:00 UTC1h 15m
2026-07-09 ASL99V ATH → BEG Jul 9, 01:40 UTCJul 9, 02:55 UTC1h 15m
2026-07-08 ASL87M BEG → ATH Jul 8, 23:00 UTCJul 9, 00:10 UTC1h 10m
2026-07-08 ASL43N MXP → BEG Jul 8, 19:25 UTCJul 8, 20:45 UTC1h 20m
2026-07-08 ASL14G BEG → LHR Jul 8, 16:30 UTCJul 8, 18:00 UTC1h 30m
2026-07-08 ASL80T - Jul 8, 13:25 UTCJul 8, 14:15 UTC50m
2026-07-08 ASL47C VAR → BEG Jul 8, 11:20 UTCJul 8, 12:05 UTC45m
2026-07-08 ASL427 - Jul 8, 01:35 UTCJul 8, 02:45 UTC1h 10m
2026-07-07 ASL426 - Jul 7, 23:00 UTCJul 8, 00:15 UTC1h 15m
2026-07-07 ASL80T - Jul 7, 13:15 UTCJul 7, 14:00 UTC45m
2026-07-07 ASL47C VAR → BEG Jul 7, 11:20 UTCJul 7, 12:10 UTC50m
2026-07-07 ASL30R FRA → BEG Jul 7, 08:15 UTCJul 7, 09:40 UTC1h 25m
2026-07-07 ASL79H BEG → FRA Jul 7, 05:10 UTCJul 7, 06:55 UTC1h 45m
2026-07-06 ASL81R TIV → BEG Jul 6, 19:30 UTCJul 6, 21:15 UTC1h 45m
2026-07-06 ASL85C BEG → BRU Jul 6, 16:15 UTCJul 6, 18:15 UTC2h 0m
2026-07-06 ASL80T - Jul 6, 13:10 UTCJul 6, 13:55 UTC45m
2026-07-06 ASL47C VAR → BEG Jul 6, 11:25 UTCJul 6, 12:10 UTC45m
2026-07-06 ASL16G MXP → BEG Jul 6, 07:45 UTCJul 6, 09:10 UTC1h 25m
2026-07-06 ASL58V BEG → MXP Jul 6, 05:15 UTCJul 6, 06:40 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?
No active broadcast right now. Last signal was 3h ago.
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.