Apparatus

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sensors Mode-S transponder

4521BA

ICAO 24-bit transponder address · allocated to Bulgaria

Hex
4521BA
Octal
21220672
Decimal
4,530,618
Country
BG
Broadcasting now · callsign LOT5PR · 34,025 ft
Flights observed
89
Distinct callsigns
18
Country
BG
Last broadcast
23d ago

Current position

4521BA is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4521BA 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 18 distinct

Callsign Airline Flights Last seen
LOT5PR LOT Polish Airlines 37 2026-07-26
LOT5FM - 25 2026-07-13
LOT2YE - 12 2026-07-26
EAF400P - 1 2026-06-11
EAF301P European Aviation Air Charter 1 2026-05-20
EAF172 - 1 2026-06-16
EAF101P - 1 2026-06-01
AMQ757 - 1 2026-06-14
AMQ756 - 1 2026-06-14
AMQ7465 - 1 2026-06-14
AMQ6281 - 1 2026-06-13
AMQ6280 - 1 2026-06-13
AMQ6028 - 1 2026-06-13
AMQ5321 - 1 2026-06-12
AMQ5320 - 1 2026-06-12
AMQ169 - 1 2026-06-15
AMQ168 - 1 2026-06-15
AMQ149 - 1 2026-06-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 LOT5PR TLV → WAW Jul 26, 15:45 UTCJul 26, 19:15 UTC3h 30m
2026-07-26 LOT2YE WAW → TLV Jul 26, 11:15 UTCJul 26, 14:20 UTC3h 5m
2026-07-25 LOT5PR TLV → WAW Jul 25, 13:35 UTCJul 25, 17:05 UTC3h 30m
2026-07-25 LOT2YE - Jul 25, 09:15 UTCJul 25, 12:25 UTC3h 10m
2026-07-24 LOT5PR TLV → WAW Jul 24, 14:40 UTCJul 24, 18:00 UTC3h 20m
2026-07-24 LOT2YE - Jul 24, 09:50 UTCJul 24, 13:10 UTC3h 20m
2026-07-23 LOT5PR TLV → WAW Jul 23, 14:05 UTCJul 23, 17:30 UTC3h 25m
2026-07-23 LOT2YE WAW → TLV Jul 23, 09:10 UTCJul 23, 12:20 UTC3h 10m
2026-07-21 LOT5PR TLV → WAW Jul 21, 13:45 UTCJul 21, 17:15 UTC3h 30m
2026-07-21 LOT2YE - Jul 21, 09:00 UTCJul 21, 12:15 UTC3h 15m
2026-07-20 LOT5PR TLV → WAW Jul 20, 15:25 UTCJul 20, 18:40 UTC3h 15m
2026-07-20 LOT2YE WAW → TLV Jul 20, 10:25 UTCJul 20, 13:40 UTC3h 15m
2026-07-19 LOT5PR TLV → WAW Jul 19, 14:30 UTCJul 19, 17:55 UTC3h 25m
2026-07-19 LOT2YE - Jul 19, 09:30 UTCJul 19, 12:50 UTC3h 20m
2026-07-18 LOT5PR TLV → WAW Jul 18, 14:45 UTCJul 18, 18:10 UTC3h 25m
2026-07-18 LOT2YE WAW → TLV Jul 18, 10:00 UTCJul 18, 13:15 UTC3h 15m
2026-07-17 LOT5PR TLV → WAW Jul 17, 14:20 UTCJul 17, 17:44 UTC3h 25m
2026-07-17 LOT2YE - Jul 17, 09:20 UTCJul 17, 12:25 UTC3h 5m
2026-07-16 LOT5PR TLV → WAW Jul 16, 15:49 UTCJul 16, 19:14 UTC3h 25m
2026-07-16 LOT2YE WAW → TLV Jul 16, 10:50 UTCJul 16, 14:00 UTC3h 10m
2026-07-15 LOT5PR TLV → WAW Jul 15, 13:40 UTCJul 15, 17:10 UTC3h 30m
2026-07-15 LOT2YE - Jul 15, 08:55 UTCJul 15, 12:05 UTC3h 10m
2026-07-14 LOT5PR TLV → WAW Jul 14, 14:35 UTCJul 14, 18:05 UTC3h 30m
2026-07-14 LOT2YE - Jul 14, 09:30 UTCJul 14, 12:45 UTC3h 15m
2026-07-13 LOT5PR TLV → WAW Jul 13, 14:20 UTCJul 13, 17:40 UTC3h 20m
2026-07-13 LOT5FM - Jul 13, 09:35 UTCJul 13, 12:50 UTC3h 15m
2026-07-12 LOT5PR TLV → WAW Jul 12, 14:50 UTCJul 12, 18:05 UTC3h 15m
2026-07-12 LOT5FM - Jul 12, 10:15 UTCJul 12, 13:30 UTC3h 15m
2026-07-11 LOT5PR TLV → WAW Jul 11, 14:00 UTCJul 11, 17:30 UTC3h 30m
2026-07-11 LOT5FM WAW → TLV Jul 11, 09:30 UTCJul 11, 12:45 UTC3h 15m
2026-07-10 LOT5PR TLV → WAW Jul 10, 14:15 UTCJul 10, 17:45 UTC3h 30m
2026-07-10 LOT5FM WAW → TLV Jul 10, 09:45 UTCJul 10, 12:55 UTC3h 10m
2026-07-09 LOT5PR TLV → WAW Jul 9, 15:20 UTCJul 9, 18:40 UTC3h 20m
2026-07-09 LOT5FM WAW → TLV Jul 9, 10:30 UTCJul 9, 13:45 UTC3h 15m
2026-07-08 LOT5PR TLV → WAW Jul 8, 13:55 UTCJul 8, 17:25 UTC3h 30m
2026-07-08 LOT5FM WAW → TLV Jul 8, 09:20 UTCJul 8, 12:30 UTC3h 10m
2026-07-07 LOT5PR TLV → WAW Jul 7, 14:40 UTCJul 7, 18:05 UTC3h 25m
2026-07-07 LOT5FM WAW → TLV Jul 7, 10:00 UTCJul 7, 13:15 UTC3h 15m
2026-07-06 LOT5PR TLV → WAW Jul 6, 14:00 UTCJul 6, 17:30 UTC3h 30m
2026-07-06 LOT5FM - Jul 6, 09:30 UTCJul 6, 12:40 UTC3h 10m
2026-07-05 LOT5PR TLV → WAW Jul 5, 14:35 UTCJul 5, 18:05 UTC3h 30m
2026-07-05 LOT5FM WAW → TLV Jul 5, 09:20 UTCJul 5, 12:30 UTC3h 10m
2026-07-04 LOT5PR TLV → WAW Jul 4, 13:35 UTCJul 4, 17:05 UTC3h 30m
2026-07-04 LOT5FM - Jul 4, 08:50 UTCJul 4, 11:55 UTC3h 5m
2026-07-03 LOT5PR TLV → WAW Jul 3, 14:10 UTCJul 3, 17:35 UTC3h 25m
2026-07-03 LOT5FM WAW → TLV Jul 3, 09:40 UTCJul 3, 12:55 UTC3h 15m
2026-07-02 LOT5PR TLV → WAW Jul 2, 13:40 UTCJul 2, 17:25 UTC3h 45m
2026-07-02 LOT5FM WAW → TLV Jul 2, 08:50 UTCJul 2, 12:20 UTC3h 30m
2026-06-28 LOT5PR TLV → WAW Jun 28, 14:50 UTCJun 28, 18:05 UTC3h 15m
2026-06-28 LOT5FM WAW → TLV Jun 28, 10:10 UTCJun 28, 13:29 UTC3h 20m

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.

Mode-S 4521BA frequently asked

What is Mode-S code 4521BA?
4521BA is an ICAO 24-bit transponder address. Allocated to Bulgaria.
Where is Mode-S 4521BA registered?
Mode-S code 4521BA is allocated to Bulgaria (BG). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4521BA broadcasting right now?
Yes. Mode-S 4521BA is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4521BA, octal 21220672, decimal 4,530,618.
What flights does 4521BA operate?
Mode-S 4521BA has broadcast 18 distinct callsigns, including LOT5PR, LOT5FM, LOT2YE, EAF400P, EAF301P.