Apparatus

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sensors Mode-S transponder

8991D9

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-58211 · AIRBUS A-321neo

Hex
8991D9
Octal
42310731
Decimal
9,015,769
Country
TW
Tail
B-58211
Type
A21N
No current signal · last broadcast 2h ago
Flights observed
284
Distinct callsigns
20
Country
TW
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 8991D9.

Country allocation

The ICAO 24-bit address 8991D9 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
SJX303 STARLUX Airlines 11 2026-05-16
SJX302 STARLUX Airlines 11 2026-05-16
SJX786 - 10 2026-06-29
SJX785 STARLUX Airlines 10 2026-06-28
SJX761 - 9 2026-07-14
SJX861 - 8 2026-07-12
SJX301 STARLUX Airlines 8 2026-05-18
SJX762 - 7 2026-06-30
SJX860 - 6 2026-07-10
SJX726 STARLUX Airlines 6 2026-05-28
SJX718 - 6 2026-07-09
SJX331 STARLUX Airlines 6 2026-05-18
SJX317 STARLUX Airlines 6 2026-05-17
SJX316 STARLUX Airlines 6 2026-05-17
SJX235 - 6 2026-06-28
SJX1835 STARLUX Airlines 6 2026-06-17
SJX792 STARLUX Airlines 5 2026-06-18
SJX791 - 5 2026-06-18
SJX717 - 5 2026-07-09
SJX715 - 5 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SJX761 - Jul 14, 03:50 UTCJul 14, 04:10 UTC20m
2026-07-13 SJX761 - Jul 13, 23:20 UTCJul 14, 02:25 UTC3h 5m
2026-07-13 SJX704 TPE → TPE Jul 13, 08:10 UTCJul 13, 14:30 UTC6h 20m
2026-07-12 SJX782 TPE → TPE Jul 12, 23:10 UTCJul 13, 05:35 UTC6h 25m
2026-07-12 SJX903 PUS → TPE Jul 12, 10:20 UTCJul 12, 12:20 UTC2h 0m
2026-07-12 SJX902 - Jul 12, 08:45 UTCJul 12, 09:10 UTC25m
2026-07-12 SJX902 - Jul 12, 07:20 UTCJul 12, 07:45 UTC25m
2026-07-12 SJX861 - Jul 12, 03:40 UTCJul 12, 04:10 UTC30m
2026-07-12 SJX861 - Jul 12, 00:40 UTCJul 12, 02:25 UTC1h 45m
2026-07-10 SJX860 - Jul 10, 04:05 UTCJul 10, 07:15 UTC3h 10m
2026-07-09 SJX718 - Jul 9, 13:25 UTCJul 9, 15:05 UTC1h 40m
2026-07-09 SJX718 - Jul 9, 12:30 UTCJul 9, 12:40 UTC10m
2026-07-09 SJX717 - Jul 9, 09:25 UTCJul 9, 09:50 UTC25m
2026-07-09 SJX717 - Jul 9, 07:15 UTCJul 9, 08:30 UTC1h 15m
2026-07-09 SJX835 UKB → TPE Jul 9, 03:15 UTCJul 9, 05:35 UTC2h 20m
2026-07-08 SJX834 - Jul 8, 23:05 UTCJul 9, 01:20 UTC2h 15m
2026-07-08 SJX718 - Jul 8, 11:30 UTCJul 8, 14:05 UTC2h 35m
2026-07-08 SJX717 - Jul 8, 07:05 UTCJul 8, 09:35 UTC2h 30m
2026-07-07 SJX782 TPE → TPE Jul 7, 23:15 UTCJul 8, 05:35 UTC6h 20m
2026-07-07 SJX861 - Jul 7, 09:00 UTCJul 7, 12:15 UTC3h 15m
2026-07-07 SJX860 - Jul 7, 04:20 UTCJul 7, 07:40 UTC3h 20m
2026-06-30 SJX762 - Jun 30, 07:20 UTCJun 30, 10:35 UTC3h 15m
2026-06-30 SJX761 TPE → CGK Jun 30, 03:50 UTCJun 30, 04:05 UTC15m
2026-06-29 SJX761 TPE → CGK Jun 29, 23:14 UTCJun 30, 02:25 UTC3h 11m
2026-06-29 SJX714 - Jun 29, 06:24 UTCJun 29, 14:29 UTC8h 5m
2026-06-29 SJX786 - Jun 29, 03:05 UTCJun 29, 04:45 UTC1h 40m
2026-06-28 SJX785 TPE → MNL Jun 28, 23:20 UTCJun 29, 01:05 UTC1h 45m
2026-06-28 SJX236 HKG → TPE Jun 28, 13:04 UTCJun 28, 14:25 UTC1h 20m
2026-06-28 SJX235 - Jun 28, 10:35 UTCJun 28, 10:55 UTC20m
2026-06-28 SJX235 - Jun 28, 09:34 UTCJun 28, 10:04 UTC30m
2026-06-28 SJX234 - Jun 28, 06:34 UTCJun 28, 07:09 UTC35m
2026-06-28 SJX234 - Jun 28, 05:34 UTCJun 28, 06:00 UTC25m
2026-06-28 SJX233 - Jun 28, 00:35 UTCJun 28, 01:59 UTC1h 25m
2026-06-27 SJX206 - Jun 27, 13:04 UTCJun 27, 14:39 UTC1h 35m
2026-06-27 SJX205 - Jun 27, 10:14 UTCJun 27, 11:25 UTC1h 10m
2026-06-27 SJX891 - Jun 27, 05:39 UTCJun 27, 05:59 UTC20m
2026-06-27 SJX890 TPE → SHI Jun 27, 03:04 UTCJun 27, 03:15 UTC10m
2026-06-26 SJX903 PUS → TPE Jun 26, 11:49 UTCJun 26, 12:14 UTC25m
2026-06-26 SJX903 PUS → TPE Jun 26, 10:20 UTCJun 26, 10:44 UTC25m
2026-06-26 SJX902 TPE → PUS Jun 26, 07:05 UTCJun 26, 08:54 UTC1h 50m
2026-06-26 SJX234 - Jun 26, 04:04 UTCJun 26, 05:19 UTC1h 15m
2026-06-26 SJX233 - Jun 26, 00:24 UTCJun 26, 01:39 UTC1h 15m
2026-06-25 SJX704 TPE → TPE Jun 25, 08:04 UTCJun 25, 15:15 UTC7h 10m
2026-06-24 SJX782 TPE → TPE Jun 24, 23:14 UTCJun 25, 05:35 UTC6h 20m
2026-06-24 SJX805 NRT → TPE Jun 24, 12:14 UTCJun 24, 15:24 UTC3h 10m
2026-06-24 SJX804 TPE → NRT Jun 24, 07:34 UTCJun 24, 10:30 UTC2h 55m
2026-06-24 SJX901 PUS → TPE Jun 24, 03:50 UTCJun 24, 05:54 UTC2h 5m
2026-06-24 SJX900 TPE → PUS Jun 24, 02:15 UTCJun 24, 02:34 UTC20m
2026-06-24 SJX900 TPE → PUS Jun 24, 00:44 UTCJun 24, 01:09 UTC25m
2026-06-23 SJX861 - Jun 23, 09:09 UTCJun 23, 12:35 UTC3h 25m

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-58211 page for operator, model, and routing details .

Mode-S 8991D9 frequently asked

What is Mode-S code 8991D9?
8991D9 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-58211.
Where is Mode-S 8991D9 registered?
Mode-S code 8991D9 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8991D9 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8991D9, octal 42310731, decimal 9,015,769.
What flights does 8991D9 operate?
Mode-S 8991D9 has broadcast 20 distinct callsigns, including SJX303, SJX302, SJX786, SJX785, SJX761.