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sensors Mode-S transponder

8A0521

ICAO 24-bit transponder address · allocated to Indonesia

Currently assigned to PK-LAZ · AIRBUS A-320

Hex
8A0521
Octal
42402441
Decimal
9,045,281
Country
ID
Tail
PK-LAZ
Type
A320
No current signal · last broadcast Jul 26, 13:05 UTC
Flights observed
271
Distinct callsigns
20
Country
ID
Last broadcast
Jul 26, 13:05 UTC

Last known position

Most recent position reported by Mode-S 8A0521.

Country allocation

The ICAO 24-bit address 8A0521 falls within the block assigned to Indonesia (ID) by ICAO Annex 10, Volume III. Every aircraft registered in Indonesia 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
BTK6825 - 8 2026-07-07
BTK7368 - 7 2026-07-06
BTK6526 - 7 2026-07-02
BTK6824 - 6 2026-07-07
BTK6362 - 6 2026-07-12
BTK7631 - 5 2026-06-26
BTK7630 - 5 2026-06-26
BTK7583 Batik Air 5 2026-07-26
BTK7513 Batik Air 4 2026-07-25
BTK7369 - 4 2026-07-13
BTK7311 Batik Air 4 2026-07-26
BTK7055 Batik Air 4 2026-07-24
BTK6863 - 4 2026-07-01
BTK6820 - 4 2026-07-09
BTK6805 - 4 2026-07-13
BTK6804 - 4 2026-07-13
BTK6508 - 4 2026-06-27
BTK7797 Batik Air 3 2026-06-21
BTK7581 Batik Air 3 2026-07-25
BTK7521 Batik Air 3 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 BTK7311 HLP → DPS Jul 26, 08:50 UTCJul 26, 13:05 UTC4h 15m
2026-07-26 BTK7583 HLP → MLG Jul 26, 04:25 UTCJul 26, 07:40 UTC3h 16m
2026-07-25 BTK7581 HLP → MLG Jul 25, 23:55 UTCJul 26, 03:25 UTC3h 30m
2026-07-25 BTK7052 PLM → HLP Jul 25, 08:35 UTCJul 25, 08:45 UTC10m
2026-07-25 BTK7051 HLP → PLM Jul 25, 06:00 UTCJul 25, 06:20 UTC20m
2026-07-25 BTK7513 HLP → SUB Jul 25, 01:45 UTCJul 25, 02:25 UTC40m
2026-07-24 BTK7055 HLP → PLM Jul 24, 12:15 UTCJul 24, 12:40 UTC25m
2026-07-24 BTK7512 SUB → HLP Jul 24, 09:20 UTCJul 24, 09:55 UTC35m
2026-07-24 BTK7501 HLP → SUB Jul 24, 06:35 UTCJul 24, 07:15 UTC40m
2026-07-24 BTK7520 - Jul 24, 05:25 UTCJul 24, 05:35 UTC10m
2026-07-24 BTK7517 HLP → SUB Jul 24, 02:40 UTCJul 24, 03:20 UTC40m
2026-07-23 BTK7511 HLP → SUB Jul 23, 22:40 UTCJul 24, 01:45 UTC3h 5m
2026-07-23 BTK7503 HLP → SUB Jul 23, 09:45 UTCJul 23, 12:35 UTC2h 50m
2026-07-23 BTK7052 PLM → HLP Jul 23, 08:45 UTCJul 23, 08:55 UTC10m
2026-07-23 BTK7051 HLP → PLM Jul 23, 06:15 UTCJul 23, 06:35 UTC20m
2026-07-23 BTK7513 HLP → SUB Jul 23, 01:55 UTCJul 23, 02:35 UTC40m
2026-07-22 - - Jul 22, 23:55 UTCJul 23, 00:10 UTC15m
2026-07-22 BTK7055 - Jul 22, 12:15 UTCJul 22, 12:35 UTC20m
2026-07-22 BTK7517 HLP → SUB Jul 22, 02:50 UTCJul 22, 03:30 UTC40m
2026-07-21 BTK7511 HLP → SUB Jul 21, 22:30 UTCJul 22, 01:25 UTC2h 55m
2026-07-21 BTK7311 HLP → DPS Jul 21, 08:55 UTCJul 21, 12:55 UTC4h 0m
2026-07-21 BTK7583 - Jul 21, 04:25 UTCJul 21, 06:55 UTC2h 30m
2026-07-20 BTK7055 - Jul 20, 12:35 UTCJul 20, 12:55 UTC20m
2026-07-20 BTK7512 SUB → HLP Jul 20, 11:20 UTCJul 20, 11:40 UTC20m
2026-07-18 BTK7515 HLP → SUB Jul 18, 10:35 UTCJul 18, 11:10 UTC35m
2026-07-18 BTK7308 - Jul 18, 09:15 UTCJul 18, 09:40 UTC25m
2026-07-17 BTK7521 HLP → SUB Jul 17, 13:35 UTCJul 17, 14:04 UTC30m
2026-07-17 BTK7515 - Jul 17, 09:40 UTCJul 17, 12:25 UTC2h 45m
2026-07-17 BTK7309 - Jul 17, 04:04 UTCJul 17, 08:10 UTC4h 5m
2026-07-16 BTK7055 - Jul 16, 12:30 UTCJul 16, 12:44 UTC15m
2026-07-16 BTK7512 - Jul 16, 09:50 UTCJul 16, 10:00 UTC10m
2026-07-16 BTK7501 - Jul 16, 06:45 UTCJul 16, 07:20 UTC35m
2026-07-16 BTK7516 - Jul 16, 05:00 UTCJul 16, 05:10 UTC10m
2026-07-16 BTK7513 - Jul 16, 02:00 UTCJul 16, 02:40 UTC40m
2026-07-15 BTK7521 - Jul 15, 13:25 UTCJul 15, 13:40 UTC15m
2026-07-15 BTK7514 - Jul 15, 11:50 UTCJul 15, 12:10 UTC20m
2026-07-14 BTK6578 - Jul 14, 08:50 UTCJul 14, 09:15 UTC25m
2026-07-14 BTK7010 - Jul 14, 03:30 UTCJul 14, 05:15 UTC1h 45m
2026-07-14 BTK7011 - Jul 14, 00:10 UTCJul 14, 01:45 UTC1h 35m
2026-07-13 BTK6565 - Jul 13, 09:10 UTCJul 13, 09:25 UTC15m
2026-07-13 BTK6564 - Jul 13, 06:05 UTCJul 13, 06:50 UTC45m
2026-07-13 BTK6805 - Jul 13, 04:05 UTCJul 13, 05:05 UTC1h 0m
2026-07-13 BTK6804 - Jul 13, 02:05 UTCJul 13, 02:55 UTC50m
2026-07-13 BTK7369 - Jul 13, 00:40 UTCJul 13, 01:01 UTC20m
2026-07-12 BTK6362 - Jul 12, 13:01 UTCJul 12, 13:25 UTC25m
2026-07-12 BTK6143 - Jul 12, 10:45 UTCJul 12, 11:01 UTC15m
2026-07-09 BTK6236 CGK → UPG Jul 9, 22:50 UTCJul 9, 23:15 UTC25m
2026-07-09 BTK6821 - Jul 9, 10:10 UTCJul 9, 10:25 UTC15m
2026-07-09 BTK6820 - Jul 9, 07:45 UTCJul 9, 08:05 UTC20m
2026-07-08 BTK6338 - Jul 8, 23:40 UTCJul 9, 00:10 UTC30m

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 PK-LAZ page for operator, model, and routing details .

Mode-S 8A0521 frequently asked

What is Mode-S code 8A0521?
8A0521 is an ICAO 24-bit transponder address. Allocated to Indonesia. Assigned to PK-LAZ.
Where is Mode-S 8A0521 registered?
Mode-S code 8A0521 is allocated to Indonesia (ID). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8A0521 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 13:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8A0521, octal 42402441, decimal 9,045,281.
What flights does 8A0521 operate?
Mode-S 8A0521 has broadcast 20 distinct callsigns, including BTK6825, BTK7368, BTK6526, BTK6824, BTK6362.