Apparatus

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sensors Mode-S transponder

8A091B

ICAO 24-bit transponder address · allocated to Indonesia

Currently assigned to PK-BKG · AIRBUS A-320

Hex
8A091B
Octal
42404433
Decimal
9,046,299
Country
ID
Tail
PK-BKG
Type
A320
No current signal · last broadcast 10h ago
Flights observed
135
Distinct callsigns
20
Country
ID
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S 8A091B.

Country allocation

The ICAO 24-bit address 8A091B 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
BTK6540 Batik Air 20 2026-05-27
BTK6658 Batik Air 7 2026-05-20
BTK6576 Batik Air 6 2026-04-21
BTK6572 Batik Air 5 2026-04-20
BTK6253 Batik Air 5 2026-04-21
BTK6821 Batik Air 4 2026-05-28
BTK6820 Batik Air 4 2026-05-28
BTK6573 Batik Air 4 2026-04-20
BTK6541 Batik Air 4 2026-05-10
BTK6378 Batik Air 4 2026-05-28
BTK6371 Batik Air 4 2026-05-28
BTK7283 Batik Air 3 2026-05-13
BTK7282 Batik Air 3 2026-05-13
BTK6857 Batik Air 3 2026-05-18
BTK6575 Batik Air 3 2026-04-20
BTK6379 Batik Air 3 2026-05-28
BTK6374 Batik Air 3 2026-05-28
BTK6339 Batik Air 3 2026-05-24
BTK6338 Batik Air 3 2026-05-23
BTK6205 Batik Air 3 2026-05-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 BTK6342 CGK → SRG May 30, 00:45 UTCMay 30, 01:10 UTC25m
2026-05-29 BTK7108 PDG → CGK May 29, 07:45 UTCMay 29, 09:05 UTC1h 20m
2026-05-29 BTK7109 CGK → PDG May 29, 05:10 UTCMay 29, 05:20 UTC10m
2026-05-29 BTK7533 CGK → YIA May 29, 01:15 UTCMay 29, 03:55 UTC2h 40m
2026-05-28 BTK6371 YIA → CGK May 28, 13:10 UTCMay 28, 13:55 UTC45m
2026-05-28 BTK6374 CGK → YIA May 28, 11:30 UTCMay 28, 12:00 UTC30m
2026-05-28 BTK6821 LLJ → CGK May 28, 09:45 UTCMay 28, 10:00 UTC15m
2026-05-28 BTK6820 CGK → LLJ May 28, 07:15 UTCMay 28, 07:25 UTC10m
2026-05-28 BTK6379 YIA → CGK May 28, 04:50 UTCMay 28, 05:35 UTC45m
2026-05-28 BTK6378 CGK → YIA May 28, 03:05 UTCMay 28, 03:30 UTC25m
2026-05-27 BTK6540 CGK → KOE May 27, 19:15 UTCMay 27, 20:05 UTC50m
2026-05-27 BTK6371 YIA → CGK May 27, 13:00 UTCMay 27, 13:40 UTC40m
2026-05-27 BTK6374 CGK → YIA May 27, 11:10 UTCMay 27, 11:30 UTC20m
2026-05-27 BTK6821 LLJ → CGK May 27, 09:40 UTCMay 27, 09:55 UTC15m
2026-05-27 BTK6820 CGK → LLJ May 27, 07:10 UTCMay 27, 07:20 UTC10m
2026-05-27 BTK6379 YIA → CGK May 27, 04:55 UTCMay 27, 05:45 UTC50m
2026-05-27 BTK6378 CGK → YIA May 27, 03:04 UTCMay 27, 03:29 UTC25m
2026-05-26 BTK6540 CGK → KOE May 26, 19:10 UTCMay 26, 19:55 UTC45m
2026-05-24 BTK6204 CGK → PKN May 24, 08:25 UTCMay 24, 08:35 UTC10m
2026-05-24 BTK6339 SRG → CGK May 24, 05:55 UTCMay 24, 06:20 UTC25m
2026-05-23 BTK6338 CGK → SRG May 23, 23:45 UTCMay 24, 00:15 UTC30m
2026-05-23 BTK6205 PKN → CGK May 23, 10:10 UTCMay 23, 10:25 UTC15m
2026-05-23 BTK6339 SRG → CGK May 23, 05:40 UTCMay 23, 06:15 UTC35m
2026-05-22 BTK6338 CGK → SRG May 22, 23:50 UTCMay 23, 00:20 UTC30m
2026-05-22 BTK6855 PKU → CGK May 22, 09:35 UTCMay 22, 10:05 UTC30m
2026-05-22 BTK6854 CGK → PKU May 22, 07:15 UTCMay 22, 08:20 UTC1h 5m
2026-05-21 BTK6884 CGK → KNO May 21, 12:05 UTCMay 22, 05:00 UTC16h 55m
2026-05-20 BTK6658 CGK → LOP May 20, 02:55 UTCMay 20, 03:35 UTC40m
2026-05-20 BTK6265 UPG → CGK May 20, 01:00 UTCMay 20, 01:15 UTC15m
2026-05-19 BTK6264 CGK → UPG May 19, 19:40 UTCMay 19, 20:00 UTC20m
2026-05-19 BTK6658 CGK → LOP May 19, 03:00 UTCMay 19, 07:40 UTC4h 40m
2026-05-18 BTK7579 SUB → CGK May 18, 11:50 UTCMay 18, 12:05 UTC15m
2026-05-18 BTK6578 CGK → SUB May 18, 08:35 UTCMay 18, 09:15 UTC40m
2026-05-18 BTK6857 PKU → CGK May 18, 04:40 UTCMay 18, 06:01 UTC1h 20m
2026-05-18 BTK6852 CGK → PKU May 18, 02:15 UTCMay 18, 03:20 UTC1h 5m
2026-05-17 BTK6821 LLJ → CGK May 17, 12:55 UTCMay 17, 13:10 UTC15m
2026-05-15 BTK6820 CGK → LLJ May 15, 07:15 UTCMay 15, 07:30 UTC15m
2026-05-15 BTK6378 CGK → YIA May 15, 03:15 UTCMay 15, 05:40 UTC2h 25m
2026-05-14 BTK6540 CGK → KOE May 14, 19:30 UTCMay 14, 20:20 UTC50m
2026-05-14 BTK6658 CGK → LOP May 14, 03:00 UTCMay 14, 03:45 UTC45m
2026-05-13 BTK6540 CGK → KOE May 13, 19:20 UTCMay 14, 01:05 UTC5h 45m
2026-05-13 BTK7283 KUL → CGK May 13, 07:50 UTCMay 13, 08:05 UTC15m
2026-05-13 BTK7283 KUL → CGK May 13, 06:20 UTCMay 13, 07:15 UTC55m
2026-05-13 BTK7282 CGK → KUL May 13, 03:20 UTCMay 13, 05:00 UTC1h 40m
2026-05-12 BTK6353 SRG → CGK May 12, 12:55 UTCMay 12, 13:30 UTC35m
2026-05-12 BTK6352 CGK → SRG May 12, 10:00 UTCMay 12, 10:25 UTC25m
2026-05-12 BTK6657 LOP → CGK May 12, 08:40 UTCMay 12, 08:50 UTC10m
2026-05-12 BTK6656 CGK → LOP May 12, 04:25 UTCMay 12, 05:05 UTC40m
2026-05-11 BTK6540 CGK → KOE May 11, 19:05 UTCMay 11, 19:50 UTC45m
2026-05-11 BTK6659 LOP → CGK May 11, 07:00 UTCMay 11, 07:10 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-BKG page for operator, model, and routing details .

Mode-S 8A091B frequently asked

What is Mode-S code 8A091B?
8A091B is an ICAO 24-bit transponder address. Allocated to Indonesia. Assigned to PK-BKG.
Where is Mode-S 8A091B registered?
Mode-S code 8A091B is allocated to Indonesia (ID). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8A091B broadcasting right now?
No active broadcast right now. Last signal was 10h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8A091B, octal 42404433, decimal 9,046,299.
What flights does 8A091B operate?
Mode-S 8A091B has broadcast 20 distinct callsigns, including BTK6540, BTK6658, BTK6576, BTK6572, BTK6253.