Apparatus

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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 57m ago
Flights observed
233
Distinct callsigns
20
Country
ID
Last broadcast
57m ago

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
BTK7369 - 4 2026-07-13
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
BTK7583 Batik Air 3 2026-05-22
BTK7156 Batik Air 3 2026-04-16
BTK6885 - 3 2026-06-15
BTK6857 Batik Air 3 2026-05-15
BTK6852 Batik Air 3 2026-05-15
BTK6821 - 3 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-08 BTK6293 UPG → CGK Jul 8, 11:35 UTCJul 8, 12:05 UTC30m
2026-07-07 BTK6266 - Jul 7, 07:50 UTCJul 7, 08:15 UTC25m
2026-07-07 BTK6825 - Jul 7, 05:00 UTCJul 7, 05:10 UTC10m
2026-07-07 BTK6824 - Jul 7, 02:35 UTCJul 7, 03:30 UTC55m
2026-07-06 BTK7368 - Jul 6, 10:50 UTCJul 6, 11:45 UTC55m
2026-07-06 BTK6564 - Jul 6, 06:15 UTCJul 6, 09:25 UTC3h 10m
2026-07-06 BTK6805 - Jul 6, 04:10 UTCJul 6, 05:05 UTC55m
2026-07-06 BTK6804 - Jul 6, 02:05 UTCJul 6, 03:00 UTC55m
2026-07-06 BTK7369 - Jul 6, 00:25 UTCJul 6, 00:55 UTC30m
2026-07-05 BTK6362 CGK → SRG Jul 5, 13:10 UTCJul 5, 13:35 UTC25m
2026-07-05 BTK6143 - Jul 5, 10:40 UTCJul 5, 11:10 UTC30m
2026-07-03 BTK6296 - Jul 3, 10:15 UTCJul 3, 10:40 UTC25m
2026-07-03 BTK8840 - Jul 3, 05:40 UTCJul 3, 06:10 UTC30m
2026-07-02 BTK6288 CGK → UPG Jul 2, 17:30 UTCJul 2, 17:40 UTC10m
2026-07-02 BTK6527 - Jul 2, 08:00 UTCJul 2, 08:15 UTC15m
2026-07-02 BTK6526 - Jul 2, 03:20 UTCJul 2, 04:00 UTC40m
2026-07-02 BTK6201 - Jul 2, 01:20 UTCJul 2, 01:35 UTC15m
2026-07-01 BTK6200 - Jul 1, 09:40 UTCJul 1, 09:50 UTC10m
2026-07-01 BTK6526 - Jul 1, 03:00 UTCJul 1, 07:55 UTC4h 55m
2026-07-01 BTK6863 - Jul 1, 01:10 UTCJul 1, 01:25 UTC15m
2026-07-01 BTK6863 - Jul 1, 00:10 UTCJul 1, 00:35 UTC25m
2026-06-30 BTK6862 CGK → BTH Jun 30, 12:45 UTCJun 30, 13:40 UTC55m
2026-06-30 BTK6517 - Jun 30, 07:40 UTCJun 30, 07:55 UTC15m
2026-06-30 BTK6050 - Jun 30, 03:50 UTCJun 30, 04:30 UTC40m
2026-06-30 BTK6573 - Jun 30, 02:25 UTCJun 30, 02:40 UTC15m
2026-06-29 BTK6572 CGK → SUB Jun 29, 23:09 UTCJun 29, 23:49 UTC40m
2026-06-29 BTK6517 - Jun 29, 08:35 UTCJun 29, 08:50 UTC15m
2026-06-29 BTK6050 - Jun 29, 04:09 UTCJun 29, 04:55 UTC45m
2026-06-29 BTK6573 - Jun 29, 02:54 UTCJun 29, 03:10 UTC15m
2026-06-28 BTK6572 CGK → SUB Jun 28, 23:14 UTCJun 28, 23:54 UTC40m
2026-06-28 BTK6401 - Jun 28, 06:59 UTCJun 28, 10:35 UTC3h 35m
2026-06-28 BTK7517 - Jun 28, 02:39 UTCJun 28, 06:00 UTC3h 20m
2026-06-27 BTK6508 - Jun 27, 07:49 UTCJun 28, 01:25 UTC17h 35m
2026-06-27 BTK6584 - Jun 27, 01:24 UTCJun 27, 04:49 UTC3h 25m
2026-06-26 BTK7630 - Jun 26, 12:00 UTCJun 26, 12:19 UTC20m
2026-06-26 BTK7630 - Jun 26, 09:14 UTCJun 26, 11:30 UTC2h 15m
2026-06-26 BTK7631 - Jun 26, 02:44 UTCJun 26, 05:55 UTC3h 10m
2026-06-25 BTK6825 - Jun 25, 04:54 UTCJun 25, 06:00 UTC1h 5m

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 57m ago.
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.