Apparatus

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sensors Mode-S transponder

8991D4

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-58206 · AIRBUS A-321neo

Hex
8991D4
Octal
42310724
Decimal
9,015,764
Country
TW
Tail
B-58206
Type
A21N
No current signal · last broadcast 1h ago
Flights observed
158
Distinct callsigns
20
Country
TW
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 8991D4.

Country allocation

The ICAO 24-bit address 8991D4 falls within the block assigned to Taiwan (TW) by ICAO Annex 10, Volume III. Every aircraft registered in Taiwan 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
SJX331 STARLUX Airlines 11 2026-05-28
SJX307 STARLUX Airlines 10 2026-05-26
SJX301 STARLUX Airlines 10 2026-05-28
SJX306 STARLUX Airlines 9 2026-05-26
SJX332 STARLUX Airlines 7 2026-05-27
SJX313 STARLUX Airlines 7 2026-05-26
SJX300 STARLUX Airlines 7 2026-05-28
SJX312 STARLUX Airlines 6 2026-05-24
SJX712 STARLUX Airlines 5 2026-04-26
SJX711 STARLUX Airlines 5 2026-04-27
SJX329 STARLUX Airlines 5 2026-05-23
SJX315 STARLUX Airlines 5 2026-05-16
SJX792 STARLUX Airlines 4 2026-04-27
SJX791 STARLUX Airlines 4 2026-04-27
SJX786 STARLUX Airlines 4 2026-04-30
SJX785 STARLUX Airlines 4 2026-04-29
SJX330 STARLUX Airlines 4 2026-05-23
SJX317 STARLUX Airlines 4 2026-05-23
SJX316 STARLUX Airlines 4 2026-05-23
SJX314 STARLUX Airlines 4 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 SJX725 TPE → KUL May 30, 03:30 UTCMay 30, 04:25 UTC55m
2026-05-29 SJX861 HKD → TPE May 29, 09:00 UTCMay 29, 12:45 UTC3h 45m
2026-05-29 SJX860 TPE → HKD May 29, 04:40 UTCMay 29, 07:45 UTC3h 5m
2026-05-28 SJX206 MFM → TPE May 28, 13:25 UTCMay 28, 14:50 UTC1h 25m
2026-05-28 SJX331 RMQ → MFM May 28, 08:45 UTCMay 28, 09:55 UTC1h 10m
2026-05-28 SJX301 TAK → RMQ May 28, 04:30 UTCMay 28, 06:50 UTC2h 20m
2026-05-28 SJX300 RMQ → TAK May 28, 01:00 UTCMay 28, 03:15 UTC2h 15m
2026-05-27 SJX332 MFM → RMQ May 27, 11:15 UTCMay 27, 12:35 UTC1h 20m
2026-05-27 SJX331 RMQ → MFM May 27, 08:40 UTCMay 27, 09:50 UTC1h 10m
2026-05-27 SJX301 TAK → RMQ May 27, 04:34 UTCMay 27, 06:44 UTC2h 10m
2026-05-27 SJX300 RMQ → TAK May 27, 00:49 UTCMay 27, 03:09 UTC2h 20m
2026-05-26 SJX313 OKA → RMQ May 26, 08:50 UTCMay 26, 12:24 UTC3h 35m
2026-05-26 SJX307 UKB → RMQ May 26, 04:35 UTCMay 26, 06:49 UTC2h 15m
2026-05-26 SJX306 RMQ → UKB May 26, 02:35 UTCMay 26, 03:09 UTC35m
2026-05-26 SJX306 RMQ → UKB May 26, 00:49 UTCMay 26, 01:10 UTC20m
2026-05-25 SJX313 OKA → RMQ May 25, 09:00 UTCMay 25, 12:40 UTC3h 40m
2026-05-25 SJX307 UKB → RMQ May 25, 04:50 UTCMay 25, 07:20 UTC2h 30m
2026-05-25 SJX306 RMQ → UKB May 25, 02:40 UTCMay 25, 03:25 UTC45m
2026-05-24 SJX312 RMQ → OKA May 24, 08:45 UTCMay 24, 12:35 UTC3h 50m
2026-05-24 SJX307 UKB → RMQ May 24, 04:40 UTCMay 24, 07:05 UTC2h 25m
2026-05-24 SJX306 RMQ → UKB May 24, 00:55 UTCMay 24, 03:10 UTC2h 15m
2026-05-23 SJX317 KMJ → RMQ May 23, 11:40 UTCMay 23, 12:15 UTC35m
2026-05-23 SJX316 RMQ → KMJ May 23, 07:15 UTCMay 23, 07:40 UTC25m
2026-05-23 SJX330 MFM → RMQ May 23, 03:40 UTCMay 23, 04:45 UTC1h 5m
2026-05-23 SJX329 RMQ → MFM May 23, 01:35 UTCMay 23, 01:55 UTC20m
2026-05-23 SJX329 RMQ → MFM May 23, 00:45 UTCMay 23, 01:05 UTC20m
2026-05-22 SJX332 MFM → RMQ May 22, 11:40 UTCMay 22, 12:50 UTC1h 10m
2026-05-22 SJX331 RMQ → MFM May 22, 09:35 UTCMay 22, 09:45 UTC10m
2026-05-22 SJX331 RMQ → MFM May 22, 08:45 UTCMay 22, 09:00 UTC15m
2026-05-22 SJX301 TAK → RMQ May 22, 06:35 UTCMay 22, 07:00 UTC25m
2026-05-22 SJX301 TAK → RMQ May 22, 04:30 UTCMay 22, 05:00 UTC30m
2026-05-22 SJX300 RMQ → TAK May 22, 01:05 UTCMay 22, 03:15 UTC2h 10m
2026-05-21 SJX313 OKA → RMQ May 21, 12:05 UTCMay 21, 12:35 UTC30m
2026-05-21 SJX312 RMQ → OKA May 21, 08:55 UTCMay 21, 09:20 UTC25m
2026-05-21 SJX307 UKB → RMQ May 21, 06:50 UTCMay 21, 07:10 UTC20m
2026-05-21 SJX307 UKB → RMQ May 21, 04:40 UTCMay 21, 05:20 UTC40m
2026-05-21 SJX306 RMQ → UKB May 21, 01:05 UTCMay 21, 03:25 UTC2h 20m
2026-05-20 SJX317 KMJ → RMQ May 20, 11:00 UTCMay 20, 11:45 UTC45m
2026-05-20 SJX316 RMQ → KMJ May 20, 07:05 UTCMay 20, 07:30 UTC25m
2026-05-20 SJX330 MFM → RMQ May 20, 04:20 UTCMay 20, 04:40 UTC21m
2026-05-20 SJX330 MFM → RMQ May 20, 03:30 UTCMay 20, 03:45 UTC15m
2026-05-20 SJX329 RMQ → MFM May 20, 00:45 UTCMay 20, 01:45 UTC1h 0m
2026-05-19 SJX317 KMJ → RMQ May 19, 11:45 UTCMay 19, 12:15 UTC30m
2026-05-19 SJX316 RMQ → KMJ May 19, 07:25 UTCMay 19, 07:50 UTC25m
2026-05-18 SJX328 DAD → RMQ May 18, 23:45 UTCMay 19, 05:35 UTC5h 50m
2026-05-18 SJX399 NRT → RMQ May 18, 08:45 UTCMay 18, 11:35 UTC2h 50m
2026-05-18 SJX398 RMQ → NRT May 18, 04:05 UTCMay 18, 07:15 UTC3h 10m
2026-05-18 SJX309 SHI → RMQ May 18, 02:00 UTCMay 18, 02:20 UTC20m
2026-05-17 SJX308 RMQ → SHI May 17, 23:20 UTCMay 17, 23:45 UTC25m
2026-05-17 SJX332 MFM → RMQ May 17, 11:50 UTCMay 17, 12:55 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 B-58206 page for operator, model, and routing details .

Mode-S 8991D4 frequently asked

What is Mode-S code 8991D4?
8991D4 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-58206.
Where is Mode-S 8991D4 registered?
Mode-S code 8991D4 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8991D4 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8991D4, octal 42310724, decimal 9,015,764.
What flights does 8991D4 operate?
Mode-S 8991D4 has broadcast 20 distinct callsigns, including SJX331, SJX307, SJX301, SJX306, SJX332.