Apparatus

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sensors Mode-S transponder

4520F3

ICAO 24-bit transponder address · allocated to Bulgaria

Currently assigned to LZ-AFA · ZLIN Z-42/142/242

Hex
4520F3
Octal
21220363
Decimal
4,530,419
Country
BG
Tail
LZ-AFA
Type
Z42
No current signal · last broadcast 1d ago
Flights observed
39
Distinct callsigns
1
Country
BG
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4520F3.

Country allocation

The ICAO 24-bit address 4520F3 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 1 distinct

Callsign Airline Flights Last seen
603 - 38 2026-07-10

Recent flights last 39

DateFlightRouteTakeoffLandingDuration
2026-07-10 603 - Jul 10, 10:05 UTCJul 10, 10:45 UTC40m
2026-07-10 603 - Jul 10, 07:50 UTCJul 10, 08:30 UTC40m
2026-07-10 603 - Jul 10, 05:05 UTCJul 10, 06:10 UTC1h 5m
2026-07-09 603 - Jul 9, 09:55 UTCJul 9, 10:35 UTC40m
2026-07-09 603 - Jul 9, 07:50 UTCJul 9, 08:20 UTC30m
2026-07-09 603 - Jul 9, 05:10 UTCJul 9, 06:15 UTC1h 5m
2026-07-08 603 - Jul 8, 09:20 UTCJul 8, 09:55 UTC35m
2026-07-08 603 - Jul 8, 07:20 UTCJul 8, 07:55 UTC35m
2026-07-08 603 - Jul 8, 05:15 UTCJul 8, 06:10 UTC55m
2026-07-02 603 - Jul 2, 05:00 UTCJul 2, 05:15 UTC15m
2026-07-01 603 - Jul 1, 07:30 UTCJul 1, 08:25 UTC55m
2026-07-01 603 - Jul 1, 05:35 UTCJul 1, 06:30 UTC55m
2026-07-01 603 - Jul 1, 03:30 UTCJul 1, 04:30 UTC1h 0m
2026-06-30 603 - Jun 30, 03:10 UTCJun 30, 04:40 UTC1h 30m
2026-06-29 603 - Jun 29, 07:30 UTCJun 29, 08:14 UTC45m
2026-06-29 603 - Jun 29, 05:34 UTCJun 29, 06:14 UTC40m
2026-06-29 603 - Jun 29, 03:10 UTCJun 29, 04:09 UTC1h 0m
2026-06-26 603 - Jun 26, 07:20 UTCJun 26, 07:45 UTC25m
2026-06-26 603 - Jun 26, 04:45 UTCJun 26, 05:44 UTC1h 0m
2026-06-25 603 - Jun 25, 09:59 UTCJun 25, 10:15 UTC15m
2026-06-25 603 - Jun 25, 05:50 UTCJun 25, 06:14 UTC25m
2026-06-23 603 - Jun 23, 08:09 UTCJun 23, 08:39 UTC30m
2026-06-23 603 - Jun 23, 05:59 UTCJun 23, 06:39 UTC40m
2026-06-23 603 - Jun 23, 03:39 UTCJun 23, 04:19 UTC40m
2026-06-22 603 - Jun 22, 06:25 UTCJun 22, 06:39 UTC15m
2026-06-22 603 - Jun 22, 04:19 UTCJun 22, 04:54 UTC35m
2026-06-19 603 - Jun 19, 09:30 UTCJun 19, 10:24 UTC55m
2026-06-19 603 - Jun 19, 07:49 UTCJun 19, 08:14 UTC25m
2026-06-19 603 - Jun 19, 05:40 UTCJun 19, 06:04 UTC25m
2026-06-19 603 - Jun 19, 03:49 UTCJun 19, 04:10 UTC20m
2026-06-17 - - Jun 17, 04:25 UTCJun 17, 04:40 UTC15m
2026-06-17 603 - Jun 17, 03:25 UTCJun 17, 03:50 UTC25m
2026-06-11 603 - Jun 11, 03:30 UTCJun 11, 04:15 UTC45m
2026-06-10 603 - Jun 10, 03:40 UTCJun 10, 04:50 UTC1h 10m
2026-05-27 603 - May 27, 05:55 UTCMay 27, 06:20 UTC25m
2026-05-27 603 - May 27, 04:55 UTCMay 27, 05:24 UTC30m
2026-05-27 603 - May 27, 03:34 UTCMay 27, 03:59 UTC25m
2026-05-07 603 - May 7, 05:55 UTCMay 7, 06:15 UTC20m
2026-05-07 603 - May 7, 04:55 UTCMay 7, 05:10 UTC15m

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

Mode-S 4520F3 frequently asked

What is Mode-S code 4520F3?
4520F3 is an ICAO 24-bit transponder address. Allocated to Bulgaria. Assigned to LZ-AFA.
Where is Mode-S 4520F3 registered?
Mode-S code 4520F3 is allocated to Bulgaria (BG). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4520F3 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4520F3, octal 21220363, decimal 4,530,419.
What flights does 4520F3 operate?
Mode-S 4520F3 has broadcast 1 distinct callsign, including 603.