Apparatus

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sensors Mode-S transponder

8991E2

ICAO 24-bit transponder address · allocated to Taiwan

Hex
8991E2
Octal
42310742
Decimal
9,015,778
Country
TW
No current signal · last broadcast 7h ago
Flights observed
186
Distinct callsigns
20
Country
TW
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S 8991E2.

Country allocation

The ICAO 24-bit address 8991E2 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
SJX821 STARLUX Airlines 21 2026-06-01
SJX839 STARLUX Airlines 20 2026-06-02
SJX235 STARLUX Airlines 14 2026-05-28
SJX838 STARLUX Airlines 13 2026-06-02
SJX820 STARLUX Airlines 12 2026-05-28
SJX236 STARLUX Airlines 10 2026-05-28
SJX805 STARLUX Airlines 9 2026-05-30
SJX847 STARLUX Airlines 8 2026-05-29
SJX846 STARLUX Airlines 8 2026-05-28
SJX863 STARLUX Airlines 6 2026-05-21
SJX804 STARLUX Airlines 6 2026-05-30
SJX2339 - 6 2026-04-15
SJX202 STARLUX Airlines 6 2026-04-30
SJX201 STARLUX Airlines 6 2026-04-30
SJX233 STARLUX Airlines 5 2026-05-30
SJX205 STARLUX Airlines 5 2026-05-27
SJX871 STARLUX Airlines 4 2026-05-22
SJX862 STARLUX Airlines 4 2026-05-21
SJX746 STARLUX Airlines 4 2026-04-28
SJX745 STARLUX Airlines 4 2026-04-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 SJX839 NGO → TPE Jun 2, 13:25 UTCJun 2, 13:45 UTC20m
2026-06-02 SJX839 NGO → TPE Jun 2, 11:20 UTCJun 2, 12:15 UTC55m
2026-06-02 SJX838 TPE → NGO Jun 2, 07:15 UTCJun 2, 09:40 UTC2h 25m
2026-06-01 SJX821 KIX → TPE Jun 1, 07:55 UTCJun 1, 08:15 UTC20m
2026-06-01 SJX821 KIX → TPE Jun 1, 05:50 UTCJun 1, 06:25 UTC35m
2026-06-01 SJX821 KIX → TPE Jun 1, 00:55 UTCJun 1, 03:05 UTC2h 10m
2026-05-31 SJX839 NGO → TPE May 31, 13:30 UTCMay 31, 14:00 UTC30m
2026-05-31 SJX839 NGO → TPE May 31, 11:30 UTCMay 31, 12:10 UTC40m
2026-05-30 SJX838 TPE → NGO May 30, 23:35 UTCMay 31, 09:45 UTC10h 10m
2026-05-30 SJX805 NRT → TPE May 30, 15:00 UTCMay 30, 15:20 UTC20m
2026-05-30 SJX805 NRT → TPE May 30, 12:05 UTCMay 30, 13:30 UTC1h 25m
2026-05-30 SJX804 TPE → NRT May 30, 07:10 UTCMay 30, 10:00 UTC2h 50m
2026-05-30 SJX234 HKG → TPE May 30, 03:45 UTCMay 30, 05:00 UTC1h 15m
2026-05-30 SJX233 TPE → HKG May 30, 00:10 UTCMay 30, 01:30 UTC1h 20m
2026-05-29 SJX839 NGO → TPE May 29, 11:10 UTCMay 29, 13:50 UTC2h 40m
2026-05-29 SJX838 TPE → NGO May 29, 07:15 UTCMay 29, 09:20 UTC2h 5m
2026-05-29 SJX847 KMJ → TPE May 29, 04:40 UTCMay 29, 05:10 UTC30m
2026-05-28 SJX846 TPE → KMJ May 28, 23:40 UTCMay 29, 00:00 UTC20m
2026-05-28 SJX236 HKG → TPE May 28, 13:15 UTCMay 28, 14:40 UTC1h 25m
2026-05-28 SJX235 TPE → HKG May 28, 10:25 UTCMay 28, 10:35 UTC10m
2026-05-28 SJX235 TPE → HKG May 28, 09:25 UTCMay 28, 09:50 UTC25m
2026-05-28 SJX821 KIX → TPE May 28, 06:25 UTCMay 28, 06:50 UTC25m
2026-05-28 SJX821 KIX → TPE May 28, 04:35 UTCMay 28, 05:10 UTC35m
2026-05-28 SJX820 TPE → KIX May 28, 01:00 UTCMay 28, 03:10 UTC2h 10m
2026-05-27 SJX206 MFM → TPE May 27, 13:20 UTCMay 27, 14:40 UTC1h 20m
2026-05-27 SJX205 TPE → MFM May 27, 11:05 UTCMay 27, 11:25 UTC20m
2026-05-27 SJX205 TPE → MFM May 27, 10:05 UTCMay 27, 10:35 UTC30m
2026-05-27 SJX821 KIX → TPE May 27, 06:49 UTCMay 27, 07:20 UTC31m
2026-05-27 SJX821 KIX → TPE May 27, 04:59 UTCMay 27, 05:35 UTC35m
2026-05-27 SJX820 TPE → KIX May 27, 01:14 UTCMay 27, 03:34 UTC2h 20m
2026-05-26 SJX839 NGO → TPE May 26, 13:15 UTCMay 26, 13:45 UTC30m
2026-05-26 SJX839 NGO → TPE May 26, 11:20 UTCMay 26, 11:54 UTC35m
2026-05-26 SJX838 TPE → NGO May 26, 07:10 UTCMay 26, 09:25 UTC2h 15m
2026-05-26 SJX847 KMJ → TPE May 26, 04:20 UTCMay 26, 04:50 UTC30m
2026-05-25 SJX846 TPE → KMJ May 25, 23:45 UTCMay 26, 00:09 UTC25m
2026-05-25 SJX236 HKG → TPE May 25, 12:30 UTCMay 25, 13:50 UTC1h 20m
2026-05-25 SJX235 TPE → HKG May 25, 10:25 UTCMay 25, 10:40 UTC15m
2026-05-25 SJX235 TPE → HKG May 25, 09:20 UTCMay 25, 09:50 UTC30m
2026-05-25 SJX821 KIX → TPE May 25, 04:50 UTCMay 25, 07:10 UTC2h 20m
2026-05-25 SJX820 TPE → KIX May 25, 02:45 UTCMay 25, 03:25 UTC40m
2026-05-24 SJX236 HKG → TPE May 24, 12:40 UTCMay 24, 14:05 UTC1h 25m
2026-05-24 SJX235 TPE → HKG May 24, 09:15 UTCMay 24, 10:35 UTC1h 20m
2026-05-24 SJX821 KIX → TPE May 24, 04:45 UTCMay 24, 07:20 UTC2h 35m
2026-05-24 SJX820 TPE → KIX May 24, 00:45 UTCMay 24, 02:55 UTC2h 10m
2026-05-23 SJX236 HKG → TPE May 23, 12:50 UTCMay 23, 14:10 UTC1h 20m
2026-05-23 SJX235 TPE → HKG May 23, 10:10 UTCMay 23, 10:30 UTC20m
2026-05-23 SJX235 TPE → HKG May 23, 09:10 UTCMay 23, 09:40 UTC30m
2026-05-23 SJX821 KIX → TPE May 23, 04:50 UTCMay 23, 07:25 UTC2h 35m
2026-05-23 SJX820 TPE → KIX May 23, 00:55 UTCMay 23, 03:10 UTC2h 14m
2026-05-22 SJX206 MFM → TPE May 22, 14:05 UTCMay 22, 14:45 UTC40m

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.

Mode-S 8991E2 frequently asked

What is Mode-S code 8991E2?
8991E2 is an ICAO 24-bit transponder address. Allocated to Taiwan.
Where is Mode-S 8991E2 registered?
Mode-S code 8991E2 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8991E2 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8991E2, octal 42310742, decimal 9,015,778.
What flights does 8991E2 operate?
Mode-S 8991E2 has broadcast 20 distinct callsigns, including SJX821, SJX839, SJX235, SJX838, SJX820.