Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

8A09A4

ICAO 24-bit transponder address · allocated to Indonesia

Currently assigned to PK-BKU · AIRBUS A-320

Hex
8A09A4
Octal
42404644
Decimal
9,046,436
Country
ID
Tail
PK-BKU
Type
A320
Broadcasting now · callsign BTK7631 · 36,025 ft
Flights observed
103
Distinct callsigns
20
Country
ID
Last broadcast
13d ago

Current position

8A09A4 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 8A09A4 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
BTK7511 - 5 2026-07-02
BTK7517 - 4 2026-07-20
BTK7501 - 4 2026-07-03
BTK7309 Batik Air 4 2026-07-23
BTK7150 Batik Air 4 2026-07-19
BTK7521 Batik Air 3 2026-07-24
BTK7503 - 3 2026-07-02
BTK7055 Batik Air 3 2026-07-03
BTK7051 - 3 2026-07-02
BTK6857 - 3 2026-07-19
BTK7513 - 2 2026-07-01
BTK7158 - 2 2026-07-08
BTK7154 - 2 2026-07-18
BTK7151 Batik Air 2 2026-07-19
BTK7147 - 2 2026-07-17
BTK7146 - 2 2026-07-17
BTK7108 Batik Air 2 2026-07-25
BTK7054 Batik Air 2 2026-07-20
BTK7011 - 2 2026-07-16
BTK6887 - 2 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 BTK6200 CGK → PKY Jul 26, 08:50 UTCJul 26, 09:00 UTC10m
2026-07-26 BTK6865 BTH → CGK Jul 26, 07:05 UTCJul 26, 07:20 UTC15m
2026-07-26 BTK6865 BTH → CGK Jul 26, 06:00 UTCJul 26, 06:35 UTC36m
2026-07-26 BTK6864 CGK → BTH Jul 26, 03:40 UTCJul 26, 04:35 UTC55m
2026-07-25 BTK7066 PKU → HLP Jul 25, 23:50 UTCJul 26, 01:15 UTC1h 25m
2026-07-25 BTK7065 CGK → PKU Jul 25, 11:20 UTCJul 25, 12:30 UTC1h 10m
2026-07-25 BTK7108 PDG → CGK Jul 25, 09:25 UTCJul 25, 09:45 UTC20m
2026-07-25 BTK7108 PDG → CGK Jul 25, 08:20 UTCJul 25, 08:55 UTC35m
2026-07-25 BTK7109 CGK → PDG Jul 25, 05:35 UTCJul 25, 06:40 UTC1h 5m
2026-07-25 BTK7540 YIA → CGK Jul 25, 03:10 UTCJul 25, 03:55 UTC45m
2026-07-25 BTK7533 CGK → YIA Jul 25, 01:25 UTCJul 25, 01:50 UTC25m
2026-07-24 BTK6391 SUB → CGK Jul 24, 23:10 UTCJul 24, 23:20 UTC10m
2026-07-24 BTK7521 HLP → SUB Jul 24, 14:35 UTCJul 24, 15:15 UTC40m
2026-07-24 BTK7514 SUB → HLP Jul 24, 13:20 UTCJul 24, 13:30 UTC10m
2026-07-24 BTK6576 CGK → SUB Jul 24, 10:35 UTCJul 24, 11:15 UTC40m
2026-07-24 BTK6253 BPN → CGK Jul 24, 08:55 UTCJul 24, 09:15 UTC20m
2026-07-24 BTK6250 CGK → BPN Jul 24, 04:25 UTCJul 24, 04:35 UTC10m
2026-07-23 BTK6572 CGK → SUB Jul 23, 23:25 UTCJul 24, 02:50 UTC3h 25m
2026-07-23 BTK7579 SUB → CGK Jul 23, 09:35 UTCJul 23, 12:55 UTC3h 20m
2026-07-23 BTK7309 HLP → DPS Jul 23, 04:25 UTCJul 23, 08:30 UTC4h 5m
2026-07-22 BTK6050 CGK → DPS Jul 22, 04:25 UTCJul 22, 14:40 UTC10h 15m
2026-07-21 BTK6572 - Jul 21, 23:20 UTCJul 22, 00:00 UTC40m
2026-07-20 BTK6391 SUB → CGK Jul 20, 23:15 UTCJul 20, 23:30 UTC15m
2026-07-20 BTK6588 - Jul 20, 13:15 UTCJul 20, 13:55 UTC40m
2026-07-20 BTK7517 - Jul 20, 07:50 UTCJul 20, 11:10 UTC3h 20m
2026-07-20 BTK7054 PLM → HLP Jul 20, 06:10 UTCJul 20, 06:45 UTC35m
2026-07-20 BTK7054 PLM → HLP Jul 20, 03:55 UTCJul 20, 04:15 UTC20m
2026-07-20 BTK7053 HLP → PLM Jul 20, 00:25 UTCJul 20, 00:45 UTC20m
2026-07-19 BTK6588 - Jul 19, 13:35 UTCJul 19, 14:15 UTC40m
2026-07-19 BTK7150 SIN → CGK Jul 19, 10:25 UTCJul 19, 10:40 UTC15m
2026-07-19 BTK7150 SIN → CGK Jul 19, 09:15 UTCJul 19, 09:50 UTC35m
2026-07-19 BTK7151 CGK → SIN Jul 19, 06:15 UTCJul 19, 07:35 UTC1h 20m
2026-07-19 BTK6857 - Jul 19, 03:30 UTCJul 19, 04:50 UTC1h 20m
2026-07-19 BTK6852 - Jul 19, 01:00 UTCJul 19, 02:05 UTC1h 5m
2026-07-18 BTK6406 - Jul 18, 06:45 UTCJul 18, 10:55 UTC4h 10m
2026-07-18 BTK7154 - Jul 18, 05:05 UTCJul 18, 05:20 UTC15m
2026-07-18 BTK7154 - Jul 18, 04:00 UTCJul 18, 04:35 UTC35m
2026-07-18 BTK7153 CGK → SIN Jul 18, 01:00 UTCJul 18, 02:14 UTC1h 15m
2026-07-17 BTK6887 - Jul 17, 11:20 UTCJul 17, 13:10 UTC1h 50m
2026-07-17 BTK7146 - Jul 17, 06:40 UTCJul 17, 07:30 UTC50m
2026-07-17 BTK7147 - Jul 17, 03:45 UTCJul 17, 04:49 UTC1h 5m
2026-07-16 BTK7146 - Jul 16, 06:30 UTCJul 16, 07:15 UTC45m
2026-07-16 BTK7147 - Jul 16, 04:00 UTCJul 16, 05:00 UTC1h 0m
2026-07-16 BTK7011 - Jul 16, 00:20 UTCJul 16, 01:55 UTC1h 35m
2026-07-15 BTK6871 - Jul 15, 09:30 UTCJul 15, 09:45 UTC15m
2026-07-15 BTK6870 - Jul 15, 07:25 UTCJul 15, 07:40 UTC15m
2026-07-15 BTK6857 - Jul 15, 05:00 UTCJul 15, 05:15 UTC15m
2026-07-15 BTK6857 - Jul 15, 03:50 UTCJul 15, 04:00 UTC10m
2026-07-15 BTK6852 - Jul 15, 01:15 UTCJul 15, 01:35 UTC20m
2026-07-11 BTK6883 - Jul 11, 09:05 UTCJul 11, 10:50 UTC1h 45m

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

Mode-S 8A09A4 frequently asked

What is Mode-S code 8A09A4?
8A09A4 is an ICAO 24-bit transponder address. Allocated to Indonesia. Assigned to PK-BKU.
Where is Mode-S 8A09A4 registered?
Mode-S code 8A09A4 is allocated to Indonesia (ID). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8A09A4 broadcasting right now?
Yes. Mode-S 8A09A4 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8A09A4, octal 42404644, decimal 9,046,436.
What flights does 8A09A4 operate?
Mode-S 8A09A4 has broadcast 20 distinct callsigns, including BTK7511, BTK7517, BTK7501, BTK7309, BTK7150.