Apparatus

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sensors Mode-S transponder

8991DE

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-58303 · AIRBUS A-330-900

Hex
8991DE
Octal
42310736
Decimal
9,015,774
Country
TW
Tail
B-58303
Type
A339
No current signal · last broadcast 14h ago
Flights observed
129
Distinct callsigns
20
Country
TW
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S 8991DE.

Country allocation

The ICAO 24-bit address 8991DE 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 - 18 2026-07-03
SJX840 - 16 2026-07-03
SJX863 - 10 2026-06-30
SJX862 - 9 2026-06-30
SJX821 - 7 2026-06-29
SJX711 - 6 2026-07-02
SJX235 STARLUX Airlines 6 2026-06-11
SJX236 - 5 2026-06-18
SJX206 - 5 2026-07-03
SJX205 - 5 2026-07-03
SJX820 - 4 2026-06-29
SJX803 - 4 2026-06-20
SJX712 - 4 2026-07-04
SJX233 STARLUX Airlines 4 2026-05-23
SJX851 STARLUX Airlines 3 2026-05-30
SJX802 - 3 2026-06-20
SJX850 STARLUX Airlines 2 2026-05-30
SJX846 STARLUX Airlines 2 2026-05-27
SJX839 STARLUX Airlines 2 2026-05-27
SJX838 STARLUX Airlines 2 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-04 SJX712 - Jul 4, 00:25 UTCJul 4, 08:30 UTC8h 5m
2026-07-03 SJX206 - Jul 3, 13:35 UTCJul 3, 15:00 UTC1h 25m
2026-07-03 SJX205 - Jul 3, 10:00 UTCJul 3, 11:10 UTC1h 10m
2026-07-03 SJX841 - Jul 3, 05:30 UTCJul 3, 07:25 UTC1h 55m
2026-07-03 SJX840 - Jul 3, 03:25 UTCJul 3, 03:45 UTC20m
2026-07-03 SJX840 - Jul 3, 02:05 UTCJul 3, 02:30 UTC25m
2026-07-02 SJX711 TPE → TPE Jul 2, 00:05 UTCJul 2, 08:00 UTC7h 55m
2026-07-01 SJX206 - Jul 1, 13:15 UTCJul 1, 14:40 UTC1h 25m
2026-07-01 SJX205 - Jul 1, 10:00 UTCJul 1, 11:15 UTC1h 15m
2026-07-01 SJX841 - Jul 1, 05:55 UTCJul 1, 07:50 UTC1h 55m
2026-07-01 SJX840 - Jul 1, 03:30 UTCJul 1, 03:40 UTC10m
2026-07-01 SJX840 - Jul 1, 02:10 UTCJul 1, 02:25 UTC15m
2026-06-30 SJX863 - Jun 30, 08:30 UTCJun 30, 11:40 UTC3h 10m
2026-06-30 SJX862 - Jun 30, 03:40 UTCJun 30, 06:10 UTC2h 30m
2026-06-29 SJX821 - Jun 29, 07:05 UTCJun 29, 07:30 UTC25m
2026-06-29 SJX821 - Jun 29, 05:04 UTCJun 29, 05:59 UTC55m
2026-06-29 SJX820 TPE → KIX Jun 29, 01:00 UTCJun 29, 03:14 UTC2h 15m
2026-06-28 SJX863 - Jun 28, 12:15 UTCJun 28, 12:35 UTC20m
2026-06-28 SJX863 - Jun 28, 09:20 UTCJun 28, 10:44 UTC1h 25m
2026-06-28 SJX862 - Jun 28, 03:45 UTCJun 28, 06:20 UTC2h 35m
2026-06-26 SJX712 - Jun 26, 23:49 UTCJun 27, 08:39 UTC8h 50m
2026-06-26 SJX746 - Jun 26, 11:14 UTCJun 26, 14:39 UTC3h 25m
2026-06-26 SJX745 - Jun 26, 06:25 UTCJun 26, 09:24 UTC3h 0m
2026-06-25 SJX841 - Jun 25, 07:09 UTCJun 25, 07:34 UTC25m
2026-06-25 SJX841 - Jun 25, 05:39 UTCJun 25, 05:50 UTC10m
2026-06-25 SJX840 - Jun 25, 01:50 UTCJun 25, 03:24 UTC1h 35m
2026-06-21 SJX712 TPE → TPE Jun 21, 23:59 UTCJun 22, 08:00 UTC8h 0m
2026-06-21 SJX206 - Jun 21, 13:04 UTCJun 21, 14:30 UTC1h 25m
2026-06-21 SJX205 - Jun 21, 09:59 UTCJun 21, 11:20 UTC1h 20m
2026-06-21 SJX841 - Jun 21, 07:25 UTCJun 21, 07:49 UTC25m
2026-06-21 SJX841 - Jun 21, 06:04 UTCJun 21, 06:24 UTC20m
2026-06-21 SJX840 - Jun 21, 03:30 UTCJun 21, 04:04 UTC35m
2026-06-21 SJX840 - Jun 21, 02:04 UTCJun 21, 02:35 UTC30m
2026-06-20 SJX803 - Jun 20, 10:20 UTCJun 20, 10:44 UTC25m
2026-06-20 SJX803 - Jun 20, 07:49 UTCJun 20, 08:59 UTC1h 10m
2026-06-20 SJX802 - Jun 20, 02:59 UTCJun 20, 05:54 UTC2h 55m
2026-06-19 SJX803 - Jun 19, 10:24 UTCJun 19, 10:39 UTC15m
2026-06-19 SJX803 - Jun 19, 07:45 UTCJun 19, 08:54 UTC1h 10m
2026-06-19 SJX802 - Jun 19, 04:39 UTCJun 19, 05:54 UTC1h 15m
2026-06-19 SJX802 - Jun 19, 02:59 UTCJun 19, 03:20 UTC20m
2026-06-18 SJX236 HKG → TPE Jun 18, 18:25 UTCJun 18, 19:50 UTC1h 25m
2026-06-18 SJX2235 - Jun 18, 15:45 UTCJun 18, 16:25 UTC40m
2026-06-18 SJX2235 - Jun 18, 14:40 UTCJun 18, 15:10 UTC30m
2026-06-18 SJX712 - Jun 18, 00:20 UTCJun 18, 08:20 UTC8h 0m
2026-06-17 SJX821 - Jun 17, 06:50 UTCJun 17, 07:15 UTC25m
2026-06-17 SJX821 - Jun 17, 04:50 UTCJun 17, 05:25 UTC35m
2026-06-17 SJX820 - Jun 17, 01:05 UTCJun 17, 03:15 UTC2h 10m
2026-06-16 SJX863 - Jun 16, 08:55 UTCJun 16, 12:10 UTC3h 15m
2026-06-16 SJX862 - Jun 16, 04:05 UTCJun 16, 06:40 UTC2h 35m
2026-06-15 SJX841 - Jun 15, 07:25 UTCJun 15, 07:55 UTC30m

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-58303 page for operator, model, and routing details .

Mode-S 8991DE frequently asked

What is Mode-S code 8991DE?
8991DE is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-58303.
Where is Mode-S 8991DE registered?
Mode-S code 8991DE is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8991DE broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8991DE, octal 42310736, decimal 9,015,774.
What flights does 8991DE operate?
Mode-S 8991DE has broadcast 20 distinct callsigns, including SJX841, SJX840, SJX863, SJX862, SJX821.