Apparatus

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sensors Mode-S transponder

8991E8

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-58505 · AIRBUS A-350-900

Hex
8991E8
Octal
42310750
Decimal
9,015,784
Country
TW
Tail
B-58505
Type
A359
No current signal · last broadcast Jul 26, 11:00 UTC
Flights observed
261
Distinct callsigns
20
Country
TW
Last broadcast
Jul 26, 11:00 UTC

Last known position

Most recent position reported by Mode-S 8991E8.

Country allocation

The ICAO 24-bit address 8991E8 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
SJX031 STARLUX Airlines 22 2026-07-25
SJX011 STARLUX Airlines 18 2026-07-20
SJX032 STARLUX Airlines 17 2026-07-24
SJX771 STARLUX Airlines 14 2026-07-23
SJX012 STARLUX Airlines 14 2026-07-19
SJX851 STARLUX Airlines 13 2026-07-26
SJX772 STARLUX Airlines 13 2026-07-23
SJX742 STARLUX Airlines 13 2026-07-24
SJX741 STARLUX Airlines 13 2026-07-24
SJX026 STARLUX Airlines 12 2026-06-27
SJX850 STARLUX Airlines 11 2026-07-26
SJX002 - 11 2026-07-04
SJX871 - 9 2026-07-19
SJX025 - 9 2026-06-28
SJX870 - 8 2026-07-19
SJX010 - 7 2026-06-29
SJX009 - 7 2026-06-30
SJX001 - 7 2026-07-05
SJX201 STARLUX Airlines 5 2026-05-17
SJX823 STARLUX Airlines 4 2026-05-31

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SJX851 CTS → TPE Jul 26, 07:35 UTCJul 26, 11:00 UTC3h 25m
2026-07-26 SJX850 TPE → CTS Jul 26, 02:15 UTCJul 26, 05:35 UTC3h 20m
2026-07-25 SJX031 SEA → TPE Jul 25, 19:50 UTCJul 25, 20:05 UTC15m
2026-07-25 SJX031 SEA → TPE Jul 25, 08:30 UTCJul 25, 18:35 UTC10h 5m
2026-07-24 SJX032 TPE → SEA Jul 24, 13:45 UTCJul 25, 00:20 UTC10h 35m
2026-07-24 SJX742 BKK → TPE Jul 24, 06:50 UTCJul 24, 10:00 UTC3h 10m
2026-07-24 SJX741 TPE → BKK Jul 24, 01:55 UTCJul 24, 05:05 UTC3h 10m
2026-07-23 SJX772 SIN → TPE Jul 23, 06:35 UTCJul 23, 10:45 UTC4h 10m
2026-07-23 SJX771 TPE → SIN Jul 23, 04:05 UTCJul 23, 04:20 UTC15m
2026-07-23 SJX771 TPE → SIN Jul 23, 00:30 UTCJul 23, 01:30 UTC1h 0m
2026-07-22 SJX031 SEA → TPE Jul 22, 19:50 UTCJul 22, 20:10 UTC20m
2026-07-22 SJX031 SEA → TPE Jul 22, 17:05 UTCJul 22, 18:35 UTC1h 30m
2026-07-21 SJX032 TPE → SEA Jul 21, 12:25 UTCJul 21, 23:10 UTC10h 45m
2026-07-21 SJX742 BKK → TPE Jul 21, 06:40 UTCJul 21, 09:55 UTC3h 15m
2026-07-21 SJX741 TPE → BKK Jul 21, 01:35 UTCJul 21, 04:45 UTC3h 10m
2026-07-20 SJX011 SFO → TPE Jul 20, 08:10 UTCJul 20, 20:25 UTC12h 15m
2026-07-19 SJX012 TPE → SFO Jul 19, 18:00 UTCJul 20, 04:00 UTC10h 0m
2026-07-19 SJX012 TPE → SFO Jul 19, 16:30 UTCJul 19, 16:50 UTC20m
2026-07-19 SJX871 - Jul 19, 07:45 UTCJul 19, 08:35 UTC50m
2026-07-19 SJX870 - Jul 19, 04:25 UTCJul 19, 04:50 UTC25m
2026-07-18 SJX742 - Jul 18, 12:10 UTCJul 18, 13:30 UTC1h 20m
2026-07-18 SJX742 - Jul 18, 09:55 UTCJul 18, 10:10 UTC15m
2026-07-18 SJX741 - Jul 18, 07:45 UTCJul 18, 07:55 UTC10m
2026-07-18 SJX741 - Jul 18, 04:55 UTCJul 18, 05:45 UTC50m
2026-07-13 SJX841 - Jul 13, 06:55 UTCJul 13, 07:35 UTC40m
2026-07-13 SJX841 - Jul 13, 05:40 UTCJul 13, 05:50 UTC10m
2026-07-13 SJX840 - Jul 13, 01:55 UTCJul 13, 03:30 UTC1h 35m
2026-07-12 SJX3851 - Jul 12, 07:25 UTCJul 12, 07:55 UTC30m
2026-07-12 SJX3851 - Jul 12, 04:35 UTCJul 12, 06:30 UTC1h 55m
2026-07-10 SJX850 - Jul 10, 02:25 UTCJul 10, 05:55 UTC3h 30m
2026-07-09 SJX011 - Jul 9, 20:55 UTCJul 9, 21:20 UTC25m
2026-07-09 SJX011 - Jul 9, 08:50 UTCJul 9, 19:45 UTC10h 55m
2026-07-08 SJX012 - Jul 8, 16:20 UTCJul 9, 03:35 UTC11h 15m
2026-07-08 SJX803 NRT → TPE Jul 8, 07:45 UTCJul 8, 10:30 UTC2h 45m
2026-07-08 SJX802 TPE → NRT Jul 8, 03:00 UTCJul 8, 06:05 UTC3h 5m
2026-07-07 SJX851 - Jul 7, 10:45 UTCJul 7, 11:05 UTC20m
2026-07-07 SJX851 - Jul 7, 07:45 UTCJul 7, 09:40 UTC1h 55m
2026-07-07 SJX850 - Jul 7, 02:30 UTCJul 7, 06:00 UTC3h 30m
2026-07-06 SJX772 - Jul 6, 06:30 UTCJul 6, 10:35 UTC4h 5m
2026-07-06 SJX771 - Jul 6, 04:05 UTCJul 6, 04:25 UTC20m
2026-07-06 SJX771 - Jul 6, 00:35 UTCJul 6, 01:35 UTC1h 0m
2026-07-05 SJX001 - Jul 5, 07:55 UTCJul 5, 20:45 UTC12h 50m
2026-07-04 SJX002 - Jul 4, 18:10 UTCJul 5, 04:20 UTC10h 10m
2026-07-04 SJX002 - Jul 4, 16:45 UTCJul 4, 17:00 UTC15m
2026-07-04 SJX851 - Jul 4, 10:55 UTCJul 4, 11:15 UTC20m
2026-07-04 SJX851 - Jul 4, 07:45 UTCJul 4, 09:50 UTC2h 5m
2026-07-04 SJX850 - Jul 4, 02:35 UTCJul 4, 05:55 UTC3h 20m
2026-07-03 SJX772 - Jul 3, 06:55 UTCJul 3, 11:20 UTC4h 25m
2026-07-03 SJX771 - Jul 3, 00:45 UTCJul 3, 04:40 UTC3h 55m
2026-07-02 SJX011 - Jul 2, 20:30 UTCJul 2, 20:50 UTC20m

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-58505 page for operator, model, and routing details .

Mode-S 8991E8 frequently asked

What is Mode-S code 8991E8?
8991E8 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-58505.
Where is Mode-S 8991E8 registered?
Mode-S code 8991E8 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8991E8 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 11:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8991E8, octal 42310750, decimal 9,015,784.
What flights does 8991E8 operate?
Mode-S 8991E8 has broadcast 20 distinct callsigns, including SJX031, SJX011, SJX032, SJX771, SJX012.