Apparatus

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sensors Mode-S transponder

4520F9

ICAO 24-bit transponder address · allocated to Bulgaria

Currently assigned to LZ-CGB · BOEING 737-800

Hex
4520F9
Octal
21220371
Decimal
4,530,425
Country
BG
Tail
LZ-CGB
Type
B738
No current signal · last broadcast 3d ago
Flights observed
128
Distinct callsigns
20
Country
BG
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S 4520F9.

Country allocation

The ICAO 24-bit address 4520F9 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
BCS9008 - 5 2026-07-11
BCS3845 - 5 2026-07-01
BCS3844 - 5 2026-07-01
BCS4127 - 4 2026-06-17
BCS4126 - 4 2026-06-17
BCS9009 - 3 2026-07-11
BCS810 - 3 2026-06-29
BCS460 European Air Transport 3 2026-06-10
BCS34W - 3 2026-07-07
BCS2960 European Air Transport 3 2026-05-07
BCS236P - 3 2026-06-10
BCS1TQ European Air Transport 3 2026-05-07
BCS95W - 2 2026-06-19
BCS822 - 2 2026-06-16
BCS820 - 2 2026-07-07
BCS811P European Air Transport 2 2026-06-22
BCS7750 - 2 2026-07-07
BCS6WK - 2 2026-06-02
BCS5917 European Air Transport 2 2026-06-03
BCS5916 European Air Transport 2 2026-06-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 BCS9009 - Jul 11, 13:45 UTCJul 11, 15:40 UTC1h 55m
2026-07-11 BCS9008 - Jul 11, 04:05 UTCJul 11, 05:40 UTC1h 35m
2026-07-09 BCS843P BCN → LEJ Jul 9, 22:00 UTCJul 9, 23:55 UTC1h 55m
2026-07-09 BCS842 LEJ → BCN Jul 9, 18:55 UTCJul 9, 20:45 UTC1h 50m
2026-07-08 BCS834P OPO → LEJ Jul 8, 23:40 UTCJul 9, 01:00 UTC1h 20m
2026-07-08 BCS831 - Jul 8, 21:00 UTCJul 8, 22:25 UTC1h 25m
2026-07-08 BCS22W - Jul 8, 18:30 UTCJul 8, 19:25 UTC55m
2026-07-08 BCS71N - Jul 8, 05:55 UTCJul 8, 06:50 UTC55m
2026-07-08 BCS3CA - Jul 8, 01:50 UTCJul 8, 03:25 UTC1h 35m
2026-07-07 BCS821 LEJ → EMA Jul 7, 23:05 UTCJul 8, 00:35 UTC1h 30m
2026-07-07 BCS34W SKG → LEJ Jul 7, 19:40 UTCJul 7, 21:55 UTC2h 15m
2026-07-07 BCS7750 ATH → SKG Jul 7, 07:20 UTCJul 7, 08:00 UTC40m
2026-07-07 BCS820 LEJ → ATH Jul 7, 01:45 UTCJul 7, 04:00 UTC2h 15m
2026-07-06 BCS71R VNO → LEJ Jul 6, 04:50 UTCJul 6, 06:10 UTC1h 20m
2026-07-06 BCS5959 LEJ → VNO Jul 6, 00:55 UTCJul 6, 02:15 UTC1h 20m
2026-07-02 BCS2135 EDI → LEJ Jul 2, 19:30 UTCJul 2, 21:05 UTC1h 35m
2026-07-02 BCS2134 LEJ → EDI Jul 2, 03:00 UTCJul 2, 05:05 UTC2h 5m
2026-07-01 BCS3845 - Jul 1, 20:30 UTCJul 1, 21:20 UTC50m
2026-07-01 BCS3844 LEJ → BLL Jul 1, 03:45 UTCJul 1, 04:30 UTC45m
2026-06-30 BCS7CW - Jun 30, 20:30 UTCJun 30, 21:50 UTC1h 20m
2026-06-30 BCS6RU LEJ → PSA Jun 30, 03:50 UTCJun 30, 05:15 UTC1h 25m
2026-06-29 BCS1RF DUB → LEJ Jun 29, 20:00 UTCJun 29, 21:39 UTC1h 40m
2026-06-29 BCS810 LEJ → DUB Jun 29, 15:24 UTCJun 29, 17:24 UTC2h 0m
2026-06-25 BCS841 LEJ → MAD Jun 25, 18:55 UTCJun 25, 20:39 UTC1h 45m
2026-06-25 BCS840 LEJ → TLL Jun 25, 05:20 UTCJun 25, 07:05 UTC1h 45m
2026-06-24 BCS830P TLS → EMA Jun 24, 16:40 UTCJun 24, 19:10 UTC2h 30m
2026-06-24 BCS4EP CGN → MAD Jun 24, 00:20 UTCJun 24, 02:15 UTC1h 55m
2026-06-23 BCS1843 - Jun 23, 21:54 UTCJun 23, 22:44 UTC50m
2026-06-23 BCS6DP LEJ → CDG Jun 23, 18:20 UTCJun 23, 19:34 UTC1h 15m
2026-06-22 BCS811P NAP → LEJ Jun 22, 06:19 UTCJun 22, 08:15 UTC1h 55m
2026-06-22 BCS810 EMA → BRU Jun 22, 03:35 UTCJun 22, 05:15 UTC1h 40m
2026-06-19 BCS21Q BOD → LEJ Jun 19, 20:55 UTCJun 19, 22:39 UTC1h 45m
2026-06-19 BCS95W - Jun 19, 04:04 UTCJun 19, 05:14 UTC1h 10m
2026-06-19 BCS852 BTS → BRQ Jun 19, 01:59 UTCJun 19, 02:54 UTC55m
2026-06-18 BCS92P BRU → LEJ Jun 18, 23:45 UTCJun 19, 00:45 UTC59m
2026-06-18 BCS5AY TLS → BRU Jun 18, 20:10 UTCJun 18, 22:15 UTC2h 5m
2026-06-18 BCS1928 LYS → TLS Jun 18, 05:00 UTCJun 18, 05:45 UTC45m
2026-06-18 BCS1730 BRU → LYS Jun 18, 02:05 UTCJun 18, 03:00 UTC55m
2026-06-17 BCS116 LEJ → BRU Jun 17, 23:00 UTCJun 17, 23:55 UTC55m
2026-06-17 BCS4127 - Jun 17, 19:45 UTCJun 17, 20:25 UTC40m
2026-06-17 BCS4126 LEJ → LNZ Jun 17, 03:35 UTCJun 17, 04:21 UTC45m
2026-06-16 BCS822 MXP → LEJ Jun 16, 22:35 UTCJun 16, 23:50 UTC1h 15m
2026-06-16 BCS4515 BSL → MXP Jun 16, 20:35 UTCJun 16, 21:10 UTC35m
2026-06-16 BCS4908 BSL → EMA Jun 16, 02:29 UTCJun 16, 03:15 UTC45m
2026-06-15 BCS815P LEJ → BRU Jun 15, 23:45 UTCJun 16, 00:40 UTC55m
2026-06-15 BCS7019 BLQ → BRU Jun 15, 20:59 UTCJun 15, 22:20 UTC1h 20m
2026-06-15 BCS9237 BLQ → LEJ Jun 15, 17:54 UTCJun 15, 19:20 UTC1h 25m
2026-06-15 BCS810P MXP → LHR Jun 15, 15:15 UTCJun 15, 16:45 UTC1h 30m
2026-06-12 BCS81Q GVA → LEJ Jun 12, 19:50 UTCJun 12, 21:05 UTC1h 15m
2026-06-12 BCS4894 MXP → GVA Jun 12, 03:25 UTCJun 12, 04:25 UTC1h 0m

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

Mode-S 4520F9 frequently asked

What is Mode-S code 4520F9?
4520F9 is an ICAO 24-bit transponder address. Allocated to Bulgaria. Assigned to LZ-CGB.
Where is Mode-S 4520F9 registered?
Mode-S code 4520F9 is allocated to Bulgaria (BG). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4520F9 broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4520F9, octal 21220371, decimal 4,530,425.
What flights does 4520F9 operate?
Mode-S 4520F9 has broadcast 20 distinct callsigns, including BCS9008, BCS3845, BCS3844, BCS4127, BCS4126.