Apparatus

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sensors Mode-S transponder

8991DF

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-58304 · AIRBUS A-330-900

Hex
8991DF
Octal
42310737
Decimal
9,015,775
Country
TW
Tail
B-58304
Type
A339
Broadcasting now · callsign SJX205 · 34,000 ft
Flights observed
185
Distinct callsigns
20
Country
TW
Last broadcast
3h ago

Current position

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

Country allocation

The ICAO 24-bit address 8991DF 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
SJX841 - 16 2026-07-14
SJX871 STARLUX Airlines 12 2026-05-24
SJX839 STARLUX Airlines 12 2026-05-23
SJX840 - 11 2026-07-14
SJX870 STARLUX Airlines 10 2026-05-24
SJX746 - 10 2026-07-13
SJX745 - 10 2026-07-13
SJX821 STARLUX Airlines 9 2026-05-30
SJX846 STARLUX Airlines 8 2026-05-21
SJX820 STARLUX Airlines 8 2026-05-30
SJX235 STARLUX Airlines 8 2026-05-30
SJX838 STARLUX Airlines 7 2026-05-23
SJX805 STARLUX Airlines 7 2026-05-20
SJX804 STARLUX Airlines 7 2026-05-20
SJX863 - 6 2026-07-12
SJX847 STARLUX Airlines 6 2026-05-21
SJX236 STARLUX Airlines 6 2026-05-30
SJX201 STARLUX Airlines 6 2026-04-19
SJX851 STARLUX Airlines 5 2026-05-28
SJX205 STARLUX Airlines 5 2026-05-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SJX841 - Jul 14, 05:55 UTCJul 14, 07:45 UTC1h 50m
2026-07-14 SJX840 - Jul 14, 03:20 UTCJul 14, 03:35 UTC15m
2026-07-14 SJX840 - Jul 14, 02:00 UTCJul 14, 02:25 UTC25m
2026-07-13 SJX746 - Jul 13, 13:35 UTCJul 13, 14:35 UTC1h 0m
2026-07-13 SJX746 - Jul 13, 11:20 UTCJul 13, 11:35 UTC15m
2026-07-13 SJX745 - Jul 13, 09:00 UTCJul 13, 09:15 UTC15m
2026-07-13 SJX745 - Jul 13, 06:10 UTCJul 13, 06:50 UTC40m
2026-07-12 SJX863 - Jul 12, 11:55 UTCJul 12, 12:25 UTC30m
2026-07-12 SJX863 - Jul 12, 09:30 UTCJul 12, 10:50 UTC1h 20m
2026-07-12 SJX862 - Jul 12, 03:55 UTCJul 12, 06:45 UTC2h 50m
2026-05-31 SJX711 TPE → SGN May 31, 00:00 UTCMay 31, 00:55 UTC55m
2026-05-30 SJX236 HKG → TPE May 30, 12:25 UTCMay 30, 13:50 UTC1h 25m
2026-05-30 SJX235 TPE → HKG May 30, 09:15 UTCMay 30, 10:25 UTC1h 10m
2026-05-30 SJX821 KIX → TPE May 30, 04:50 UTCMay 30, 07:20 UTC2h 30m
2026-05-30 SJX820 TPE → KIX May 30, 00:45 UTCMay 30, 02:55 UTC2h 10m
2026-05-29 SJX236 HKG → TPE May 29, 14:05 UTCMay 29, 14:35 UTC30m
2026-05-29 SJX236 HKG → TPE May 29, 13:20 UTCMay 29, 13:35 UTC15m
2026-05-29 SJX235 TPE → HKG May 29, 10:10 UTCMay 29, 11:30 UTC1h 20m
2026-05-29 SJX821 KIX → TPE May 29, 06:35 UTCMay 29, 07:00 UTC25m
2026-05-29 SJX821 KIX → TPE May 29, 04:35 UTCMay 29, 05:15 UTC40m
2026-05-29 SJX820 TPE → KIX May 29, 00:55 UTCMay 29, 03:05 UTC2h 10m
2026-05-28 SJX851 CTS → TPE May 28, 07:40 UTCMay 28, 11:15 UTC3h 35m
2026-05-28 SJX850 TPE → CTS May 28, 02:30 UTCMay 28, 05:55 UTC3h 25m
2026-05-27 SJX851 CTS → TPE May 27, 07:45 UTCMay 27, 11:10 UTC3h 25m
2026-05-27 SJX850 TPE → CTS May 27, 02:34 UTCMay 27, 05:59 UTC3h 25m
2026-05-26 SJX863 SDJ → TPE May 26, 08:39 UTCMay 26, 11:39 UTC3h 0m
2026-05-26 SJX862 TPE → SDJ May 26, 03:40 UTCMay 26, 06:25 UTC2h 45m
2026-05-25 SJX841 FUK → TPE May 25, 07:20 UTCMay 25, 07:50 UTC30m
2026-05-25 SJX841 FUK → TPE May 25, 06:05 UTCMay 25, 06:15 UTC10m
2026-05-25 SJX840 TPE → FUK May 25, 02:10 UTCMay 25, 02:40 UTC30m
2026-05-24 SJX206 MFM → TPE May 24, 13:15 UTCMay 24, 14:35 UTC1h 20m
2026-05-24 SJX205 TPE → MFM May 24, 10:05 UTCMay 24, 11:25 UTC1h 20m
2026-05-24 SJX871 OKA → TPE May 24, 07:55 UTCMay 24, 08:35 UTC40m
2026-05-24 SJX870 TPE → OKA May 24, 04:35 UTCMay 24, 05:00 UTC25m
2026-05-23 SJX839 NGO → TPE May 23, 13:40 UTCMay 23, 14:05 UTC25m
2026-05-23 SJX839 NGO → TPE May 23, 11:35 UTCMay 23, 12:15 UTC40m
2026-05-23 SJX838 TPE → NGO May 23, 07:40 UTCMay 23, 09:50 UTC2h 10m
2026-05-22 SJX236 HKG → TPE May 22, 13:00 UTCMay 22, 14:35 UTC1h 35m
2026-05-22 SJX235 TPE → HKG May 22, 10:25 UTCMay 22, 10:35 UTC10m
2026-05-22 SJX235 TPE → HKG May 22, 09:15 UTCMay 22, 09:45 UTC30m
2026-05-22 SJX821 KIX → TPE May 22, 07:00 UTCMay 22, 07:30 UTC30m
2026-05-22 SJX821 KIX → TPE May 22, 05:00 UTCMay 22, 05:30 UTC30m
2026-05-22 SJX820 TPE → KIX May 22, 00:45 UTCMay 22, 03:00 UTC2h 15m
2026-05-21 SJX839 NGO → TPE May 21, 13:45 UTCMay 21, 14:15 UTC30m
2026-05-21 SJX839 NGO → TPE May 21, 11:30 UTCMay 21, 12:15 UTC45m
2026-05-21 SJX838 TPE → NGO May 21, 07:35 UTCMay 21, 09:55 UTC2h 20m
2026-05-21 SJX847 KMJ → TPE May 21, 05:30 UTCMay 21, 06:00 UTC30m
2026-05-21 SJX846 TPE → KMJ May 21, 01:15 UTCMay 21, 01:25 UTC10m
2026-05-20 SJX846 TPE → KMJ May 20, 23:40 UTCMay 21, 00:20 UTC40m
2026-05-20 SJX805 NRT → TPE May 20, 12:15 UTCMay 20, 15:20 UTC3h 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-58304 page for operator, model, and routing details .

Mode-S 8991DF frequently asked

What is Mode-S code 8991DF?
8991DF is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-58304.
Where is Mode-S 8991DF registered?
Mode-S code 8991DF is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8991DF broadcasting right now?
Yes. Mode-S 8991DF is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8991DF, octal 42310737, decimal 9,015,775.
What flights does 8991DF operate?
Mode-S 8991DF has broadcast 20 distinct callsigns, including SJX841, SJX871, SJX839, SJX840, SJX870.