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
Broadcasting now · callsign BTK6201 · 650 ft
Flights observed
129
Distinct callsigns
20
Country
ID
Last broadcast
21h ago

Current position

8A0521 is currently broadcasting. Map zoomed to live position.

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
BTK7368 Batik Air 5 2026-05-28
BTK6526 Batik Air 5 2026-05-29
BTK7631 - 4 2026-04-13
BTK6825 Batik Air 4 2026-05-25
BTK6362 Batik Air 4 2026-05-27
BTK7630 - 3 2026-04-13
BTK7583 Batik Air 3 2026-05-22
BTK7156 Batik Air 3 2026-04-16
BTK6857 Batik Air 3 2026-05-15
BTK6852 Batik Air 3 2026-05-15
BTK6824 Batik Air 3 2026-05-25
BTK7797 Batik Air 2 2026-05-26
BTK7582 Batik Air 2 2026-05-22
BTK7581 Batik Air 2 2026-05-20
BTK7369 Batik Air 2 2026-05-18
BTK7311 Batik Air 2 2026-05-22
BTK7159 Batik Air 2 2026-04-19
BTK6805 Batik Air 2 2026-05-18
BTK6804 Batik Air 2 2026-05-18
BTK6674 Batik Air 2 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 BTK6526 CGK → LBJ May 29, 03:00 UTCMay 29, 03:45 UTC45m
2026-05-29 BTK6375 SOC → CGK May 29, 00:20 UTCMay 29, 01:00 UTC40m
2026-05-28 BTK7368 CGK → SOC May 28, 10:45 UTCMay 28, 11:30 UTC45m
2026-05-28 BTK6675 TRK → CGK May 28, 08:45 UTCMay 28, 09:00 UTC15m
2026-05-28 BTK6674 CGK → TRK May 28, 03:35 UTCMay 28, 03:45 UTC10m
2026-05-27 BTK6362 CGK → SRG May 27, 12:40 UTCMay 27, 13:00 UTC20m
2026-05-27 BTK6205 PKN → CGK May 27, 10:10 UTCMay 27, 10:25 UTC15m
2026-05-27 BTK7780 SOQ → CGK May 27, 05:45 UTCMay 27, 05:59 UTC15m
2026-05-26 BTK7797 CGK → SOQ May 26, 17:50 UTCMay 26, 18:14 UTC25m
2026-05-25 BTK7797 CGK → SOQ May 25, 17:40 UTCMay 25, 18:05 UTC25m
2026-05-25 BTK6371 YIA → CGK May 25, 13:10 UTCMay 25, 13:50 UTC40m
2026-05-25 BTK6374 CGK → YIA May 25, 11:20 UTCMay 25, 11:45 UTC25m
2026-05-25 BTK6820 CGK → LLJ May 25, 07:35 UTCMay 25, 10:25 UTC2h 50m
2026-05-25 BTK6825 TNJ → CGK May 25, 05:55 UTCMay 25, 06:05 UTC10m
2026-05-25 BTK6825 TNJ → CGK May 25, 05:05 UTCMay 25, 05:25 UTC20m
2026-05-25 BTK6824 CGK → TNJ May 25, 02:45 UTCMay 25, 03:35 UTC50m
2026-05-24 BTK7368 CGK → SOC May 24, 10:45 UTCMay 24, 11:40 UTC55m
2026-05-24 BTK6674 CGK → TRK May 24, 03:35 UTCMay 24, 03:45 UTC10m
2026-05-23 BTK6540 CGK → KOE May 23, 19:10 UTCMay 23, 19:55 UTC45m
2026-05-23 BTK6213 BDJ → CGK May 23, 12:40 UTCMay 23, 12:50 UTC10m
2026-05-23 BTK6509 DPS → CGK May 23, 06:25 UTCMay 23, 06:55 UTC30m
2026-05-22 BTK7311 HLP → DPS May 22, 09:05 UTCMay 23, 06:55 UTC21h 49m
2026-05-22 BTK7582 MLG → HLP May 22, 07:35 UTCMay 22, 07:45 UTC10m
2026-05-22 BTK7583 HLP → MLG May 22, 04:20 UTCMay 22, 05:00 UTC40m
2026-05-21 BTK7515 HLP → SUB May 21, 10:05 UTCMay 21, 13:30 UTC3h 25m
2026-05-21 BTK7582 MLG → HLP May 21, 06:05 UTCMay 21, 09:15 UTC3h 10m
2026-05-20 BTK7311 HLP → DPS May 20, 09:05 UTCMay 20, 09:45 UTC40m
2026-05-20 BTK7583 HLP → MLG May 20, 04:35 UTCMay 20, 05:10 UTC36m
2026-05-20 BTK7581 HLP → MLG May 20, 00:05 UTCMay 20, 03:00 UTC2h 55m
2026-05-19 BTK6508 CGK → DPS May 19, 07:50 UTCMay 19, 08:25 UTC35m
2026-05-19 BTK6339 SRG → CGK May 19, 05:40 UTCMay 19, 06:15 UTC35m
2026-05-18 BTK6338 CGK → SRG May 18, 23:50 UTCMay 19, 00:10 UTC20m
2026-05-18 BTK6565 MLG → CGK May 18, 09:20 UTCMay 18, 09:35 UTC15m
2026-05-18 BTK6564 CGK → MLG May 18, 06:10 UTCMay 18, 06:45 UTC35m
2026-05-18 BTK6805 DJB → CGK May 18, 04:11 UTCMay 18, 05:05 UTC55m
2026-05-18 BTK6804 CGK → DJB May 18, 02:00 UTCMay 18, 02:50 UTC50m
2026-05-18 BTK7369 SRG → CGK May 18, 00:25 UTCMay 18, 00:50 UTC25m
2026-05-17 BTK6362 CGK → SRG May 17, 12:55 UTCMay 17, 13:20 UTC25m
2026-05-15 BTK6266 CGK → UPG May 15, 07:40 UTCMay 15, 08:05 UTC25m
2026-05-15 BTK6857 PKU → CGK May 15, 04:40 UTCMay 15, 05:55 UTC1h 15m
2026-05-15 BTK6852 CGK → PKU May 15, 02:10 UTCMay 15, 03:20 UTC1h 10m
2026-05-14 BTK7041 HLP → SOC May 14, 08:50 UTCMay 14, 09:45 UTC55m
2026-05-14 BTK7539 HLP → YIA May 14, 05:05 UTCMay 14, 05:30 UTC25m
2026-05-14 BTK6141 TTE → CGK May 14, 02:40 UTCMay 14, 03:10 UTC30m
2026-05-13 BTK6140 CGK → TTE May 13, 19:40 UTCMay 13, 19:50 UTC10m
2026-05-13 BTK6292 CGK → UPG May 13, 02:25 UTCMay 13, 12:05 UTC9h 40m
2026-05-12 BTK6362 CGK → SRG May 12, 13:00 UTCMay 12, 13:20 UTC20m
2026-05-12 BTK6401 SUB → CGK May 12, 10:25 UTCMay 12, 10:35 UTC10m
2026-05-12 BTK6406 CGK → SUB May 12, 07:00 UTCMay 12, 07:20 UTC20m
2026-05-12 BTK6585 SUB → CGK May 12, 04:20 UTCMay 12, 04:30 UTC10m

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?
Yes. Mode-S 8A0521 is currently airborne.
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 BTK7368, BTK6526, BTK7631, BTK6825, BTK6362.