Apparatus

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sensors Mode-S transponder

4520EB

ICAO 24-bit transponder address · allocated to Bulgaria

Currently assigned to LZ-DBT · AIRBUS A-320

Hex
4520EB
Octal
21220353
Decimal
4,530,411
Country
BG
Tail
LZ-DBT
Type
A320
Broadcasting now · callsign UBD432 · 32,975 ft
Flights observed
169
Distinct callsigns
20
Country
BG
Last broadcast
Jul 26, 21:30 UTC

Current position

4520EB is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4520EB 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
UBD438 United Airways 35 2026-07-26
UBD437 - 35 2026-07-19
UBD423 United Airways 16 2026-07-23
UBD424 - 13 2026-07-10
UBD496 United Airways 7 2026-06-21
UBD435 United Airways 7 2026-07-24
UBD761 United Airways 6 2026-06-13
UBD495 United Airways 6 2026-07-22
UBD432 United Airways 6 2026-07-25
UBD445 - 5 2026-06-29
UBD436 United Airways 5 2026-07-24
UBD446 United Airways 4 2026-06-29
UBD431 United Airways 4 2026-07-25
UBD482 United Airways 3 2026-07-18
UBD762 United Airways 2 2026-06-01
UBD481 - 2 2026-07-17
UBD4438 - 2 2026-07-21
UBD442 United Airways 2 2026-07-23
UBD441 United Airways 2 2026-07-22
UBD115 United Airways 2 2026-05-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UBD438 DUS → EBL Jul 26, 10:25 UTCJul 26, 21:25 UTC11h 0m
2026-07-25 UBD432 CPH → EBL Jul 25, 23:10 UTCJul 26, 08:45 UTC9h 36m
2026-07-25 UBD431 EBL → CPH Jul 25, 10:15 UTCJul 25, 20:45 UTC10h 30m
2026-07-24 UBD436 CGN → EBL Jul 24, 22:45 UTCJul 25, 01:20 UTC2h 35m
2026-07-24 UBD435 EBL → CGN Jul 24, 10:35 UTCJul 24, 21:20 UTC10h 45m
2026-07-23 UBD423 EBL → AMS Jul 23, 18:55 UTCJul 24, 09:00 UTC14h 5m
2026-07-23 UBD442 MUC → EBL Jul 23, 09:40 UTCJul 23, 11:45 UTC2h 5m
2026-07-22 UBD441 EBL → MUC Jul 22, 21:30 UTCJul 23, 07:25 UTC9h 55m
2026-07-22 UBD495 EBL → HAJ Jul 22, 11:20 UTCJul 22, 20:00 UTC8h 40m
2026-07-21 UBD4438 - Jul 21, 12:45 UTCJul 22, 05:25 UTC16h 40m
2026-07-20 UBD4437 CGN → DUS Jul 20, 21:40 UTCJul 21, 10:55 UTC13h 14m
2026-07-20 UBD435 EBL → CGN Jul 20, 09:55 UTCJul 20, 19:55 UTC10h 0m
2026-07-19 UBD437 HAJ → DUS Jul 19, 22:15 UTCJul 20, 08:00 UTC9h 45m
2026-07-19 UBD428 FRA → EBL Jul 19, 10:35 UTCJul 19, 20:50 UTC10h 15m
2026-07-18 UBD432 CPH → FRA Jul 18, 22:15 UTCJul 19, 08:30 UTC10h 15m
2026-07-18 UBD482 STR → EBL Jul 18, 10:10 UTCJul 18, 20:45 UTC10h 35m
2026-07-17 UBD481 CGN → STR Jul 17, 22:40 UTCJul 18, 08:35 UTC9h 56m
2026-07-17 UBD435 EBL → CGN Jul 17, 10:30 UTCJul 17, 21:00 UTC10h 30m
2026-07-16 UBD437 - Jul 16, 13:00 UTCJul 17, 08:45 UTC19h 45m
2026-07-16 UBD437 - Jul 16, 10:50 UTCJul 17, 08:45 UTC21h 55m
2026-07-16 UBD438 DUS → DUS Jul 16, 09:55 UTCJul 17, 08:45 UTC22h 50m
2026-07-15 UBD437 HAJ → DUS Jul 15, 21:10 UTCJul 16, 08:05 UTC10h 55m
2026-07-14 UBD4438 DUS → STR Jul 14, 15:25 UTCJul 15, 08:05 UTC16h 39m
2026-07-13 UBD436 - Jul 13, 21:30 UTCJul 14, 12:45 UTC15h 15m
2026-07-13 UBD435 DUS → CGN Jul 13, 09:45 UTCJul 13, 20:05 UTC10h 20m
2026-07-12 UBD437 - Jul 12, 21:55 UTCJul 13, 07:50 UTC9h 55m
2026-07-12 UBD438 DUS → HAJ Jul 12, 09:40 UTCJul 12, 20:35 UTC10h 55m
2026-07-11 UBD437 - Jul 11, 21:50 UTCJul 12, 08:01 UTC10h 10m
2026-07-10 UBD436 - Jul 10, 22:30 UTCJul 11, 04:40 UTC6h 10m
2026-07-10 UBD424 - Jul 10, 10:35 UTCJul 10, 20:55 UTC10h 20m
2026-07-09 UBD423 - Jul 9, 18:55 UTCJul 10, 08:50 UTC13h 55m
2026-07-09 UBD438 - Jul 9, 09:50 UTCJul 9, 17:30 UTC7h 40m
2026-07-09 UBD437 - Jul 9, 04:40 UTCJul 9, 07:55 UTC3h 15m
2026-07-07 UBD424 - Jul 7, 19:25 UTCJul 7, 22:45 UTC3h 20m
2026-07-07 UBD423 - Jul 7, 15:00 UTCJul 7, 17:50 UTC2h 50m
2026-07-06 UBD423 - Jul 6, 19:05 UTCJul 7, 06:45 UTC11h 40m
2026-07-04 UBD437 - Jul 4, 12:50 UTCJul 5, 07:50 UTC19h 0m
2026-07-04 UBD437 STR → DUS Jul 4, 11:05 UTCJul 5, 07:50 UTC20h 45m
2026-07-04 UBD436 CGN → STR Jul 4, 00:30 UTCJul 4, 09:50 UTC9h 20m
2026-07-03 UBD435 AMS → CGN Jul 3, 12:40 UTCJul 3, 23:15 UTC10h 35m
2026-07-02 UBD423 - Jul 2, 12:50 UTCJul 3, 08:45 UTC19h 55m
2026-07-02 UBD438 - Jul 2, 10:50 UTCJul 3, 08:45 UTC21h 55m
2026-07-02 UBD438 - Jul 2, 10:15 UTCJul 3, 08:45 UTC22h 30m
2026-07-01 UBD437 - Jul 1, 12:50 UTCJul 2, 07:40 UTC18h 50m
2026-07-01 UBD437 - Jul 1, 10:50 UTCJul 2, 07:40 UTC20h 50m
2026-07-01 UBD437 DUS → DUS Jul 1, 10:10 UTCJul 2, 07:40 UTC21h 30m
2026-06-30 UBD437 - Jun 30, 12:50 UTCJul 1, 07:55 UTC19h 5m
2026-06-30 UBD424 AMS → DUS Jun 30, 11:30 UTCJul 1, 07:55 UTC20h 25m
2026-06-29 UBD423 - Jun 29, 19:09 UTCJun 30, 08:40 UTC13h 31m
2026-06-29 UBD446 BER → EBL Jun 29, 09:54 UTCJun 29, 17:30 UTC7h 35m

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

Mode-S 4520EB frequently asked

What is Mode-S code 4520EB?
4520EB is an ICAO 24-bit transponder address. Allocated to Bulgaria. Assigned to LZ-DBT.
Where is Mode-S 4520EB registered?
Mode-S code 4520EB is allocated to Bulgaria (BG). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4520EB broadcasting right now?
Yes. Mode-S 4520EB is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4520EB, octal 21220353, decimal 4,530,411.
What flights does 4520EB operate?
Mode-S 4520EB has broadcast 20 distinct callsigns, including UBD438, UBD437, UBD423, UBD424, UBD496.