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
Broadcasting now · callsign SJX725 · 12,500 ft
Flights observed
285
Distinct callsigns
20
Country
TW
Last broadcast
13h ago

Current position

8991D4 is currently broadcasting. Map zoomed to live position.

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
SJX786 - 18 2026-07-08
SJX785 STARLUX Airlines 18 2026-07-07
SJX714 - 12 2026-07-08
SJX761 STARLUX Airlines 11 2026-06-27
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
SJX792 - 7 2026-06-25
SJX791 - 7 2026-06-25
SJX713 - 7 2026-06-18
SJX332 STARLUX Airlines 7 2026-05-27
SJX313 STARLUX Airlines 7 2026-05-26
SJX300 STARLUX Airlines 7 2026-05-28
SJX900 - 6 2026-07-13
SJX762 - 6 2026-06-27
SJX312 STARLUX Airlines 6 2026-05-24
SJX860 - 5 2026-06-24
SJX712 STARLUX Airlines 5 2026-04-26
SJX711 STARLUX Airlines 5 2026-04-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SJX704 - Jul 14, 07:55 UTCJul 14, 14:30 UTC6h 35m
2026-07-13 SJX901 PUS → TPE Jul 13, 03:40 UTCJul 13, 05:31 UTC1h 50m
2026-07-13 SJX900 - Jul 13, 02:01 UTCJul 13, 02:30 UTC30m
2026-07-13 SJX900 - Jul 13, 00:30 UTCJul 13, 01:01 UTC30m
2026-07-12 SJX784 TPE → TPE Jul 12, 08:30 UTCJul 12, 14:40 UTC6h 10m
2026-07-12 SJX835 - Jul 12, 04:55 UTCJul 12, 05:15 UTC20m
2026-07-12 SJX835 - Jul 12, 03:05 UTCJul 12, 03:45 UTC40m
2026-07-11 SJX834 TPE → UKB Jul 11, 22:55 UTCJul 12, 01:15 UTC2h 20m
2026-07-09 SJX903 PUS → TPE Jul 9, 10:20 UTCJul 9, 12:35 UTC2h 15m
2026-07-09 SJX902 - Jul 9, 08:40 UTCJul 9, 09:05 UTC25m
2026-07-09 SJX902 - Jul 9, 07:15 UTCJul 9, 07:40 UTC25m
2026-07-08 SJX714 TPE → TPE Jul 8, 06:45 UTCJul 8, 14:25 UTC7h 40m
2026-07-08 SJX786 MNL → TPE Jul 8, 02:50 UTCJul 8, 04:35 UTC1h 45m
2026-07-07 SJX785 TPE → MNL Jul 7, 23:30 UTCJul 8, 01:15 UTC1h 45m
2026-07-07 SJX714 TPE → TPE Jul 7, 06:40 UTCJul 7, 14:50 UTC8h 10m
2026-07-07 SJX786 MNL → TPE Jul 7, 02:55 UTCJul 7, 04:40 UTC1h 45m
2026-07-06 SJX785 TPE → MNL Jul 6, 23:30 UTCJul 7, 01:10 UTC1h 40m
2026-07-06 SJX703 TPE → TPE Jul 6, 08:05 UTCJul 6, 14:20 UTC6h 15m
2026-07-06 SJX901 PUS → TPE Jul 6, 03:50 UTCJul 6, 05:50 UTC2h 0m
2026-07-06 SJX900 - Jul 6, 02:10 UTCJul 6, 02:35 UTC25m
2026-07-06 SJX900 - Jul 6, 00:40 UTCJul 6, 01:10 UTC30m
2026-07-05 SJX714 TPE → TPE Jul 5, 06:30 UTCJul 5, 14:40 UTC8h 10m
2026-07-05 SJX786 - Jul 5, 03:05 UTCJul 5, 04:55 UTC1h 50m
2026-07-04 SJX785 TPE → MNL Jul 4, 23:35 UTCJul 5, 01:15 UTC1h 40m
2026-07-04 SJX714 TPE → TPE Jul 4, 06:40 UTCJul 4, 14:40 UTC8h 0m
2026-07-04 SJX786 - Jul 4, 03:05 UTCJul 4, 04:55 UTC1h 50m
2026-07-03 SJX785 TPE → MNL Jul 3, 23:45 UTCJul 4, 01:35 UTC1h 50m
2026-07-03 SJX714 TPE → TPE Jul 3, 06:50 UTCJul 3, 14:55 UTC8h 5m
2026-07-03 SJX786 MNL → TPE Jul 3, 03:05 UTCJul 3, 04:50 UTC1h 45m
2026-07-02 SJX785 TPE → MNL Jul 2, 23:30 UTCJul 3, 01:25 UTC1h 55m
2026-07-02 SJX726 - Jul 2, 12:50 UTCJul 2, 14:05 UTC1h 15m
2026-07-02 SJX726 - Jul 2, 09:40 UTCJul 2, 09:55 UTC15m
2026-07-02 SJX725 - Jul 2, 03:35 UTCJul 2, 07:45 UTC4h 10m
2026-07-01 SJX714 - Jul 1, 06:40 UTCJul 1, 14:45 UTC8h 5m
2026-07-01 SJX786 - Jul 1, 03:10 UTCJul 1, 04:50 UTC1h 40m
2026-06-30 SJX785 TPE → MNL Jun 30, 23:30 UTCJul 1, 01:15 UTC1h 45m
2026-06-30 SJX714 - Jun 30, 06:45 UTCJun 30, 14:40 UTC7h 55m
2026-06-30 SJX786 MNL → TPE Jun 30, 03:10 UTCJun 30, 04:50 UTC1h 40m
2026-06-29 SJX785 TPE → MNL Jun 29, 23:19 UTCJun 30, 01:09 UTC1h 50m
2026-06-29 SJX705 - Jun 29, 07:15 UTCJun 29, 15:34 UTC8h 20m
2026-06-28 SJX781 - Jun 28, 23:09 UTCJun 29, 05:24 UTC6h 15m
2026-06-28 SJX783 - Jun 28, 08:39 UTCJun 28, 15:09 UTC6h 30m
2026-06-27 SJX762 - Jun 27, 07:49 UTCJun 27, 11:14 UTC3h 25m
2026-06-27 SJX761 TPE → CGK Jun 27, 04:09 UTCJun 27, 04:24 UTC15m
2026-06-26 SJX761 TPE → CGK Jun 26, 23:39 UTCJun 27, 02:39 UTC3h 0m
2026-06-26 SJX762 - Jun 26, 08:10 UTCJun 26, 11:24 UTC3h 15m
2026-06-26 SJX761 TPE → CGK Jun 26, 04:00 UTCJun 26, 04:14 UTC15m
2026-06-25 SJX761 TPE → CGK Jun 25, 23:24 UTCJun 26, 02:30 UTC3h 5m
2026-06-25 SJX792 - Jun 25, 13:05 UTCJun 25, 15:24 UTC2h 20m
2026-06-25 SJX791 - Jun 25, 09:45 UTCJun 25, 11:25 UTC1h 40m

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?
Yes. Mode-S 8991D4 is currently airborne.
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 SJX786, SJX785, SJX714, SJX761, SJX331.