Apparatus

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sensors Mode-S transponder

8991E3

ICAO 24-bit transponder address · allocated to Taiwan

Hex
8991E3
Octal
42310743
Decimal
9,015,779
Country
TW
No current signal · last broadcast 1h ago
Flights observed
194
Distinct callsigns
20
Country
TW
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 8991E3.

Country allocation

The ICAO 24-bit address 8991E3 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
SJX839 - 21 2026-07-03
SJX838 - 18 2026-07-03
SJX847 - 14 2026-07-03
SJX846 STARLUX Airlines 14 2026-07-02
SJX821 - 12 2026-07-04
SJX235 - 11 2026-07-04
SJX820 - 10 2026-07-04
SJX201 - 10 2026-06-28
SJX202 - 9 2026-06-28
SJX841 - 8 2026-06-30
SJX840 - 7 2026-06-30
SJX236 - 7 2026-07-04
SJX205 - 7 2026-06-30
SJX805 - 6 2026-06-29
SJX746 - 6 2026-06-28
SJX745 - 6 2026-06-28
SJX863 - 5 2026-07-05
SJX206 - 5 2026-06-30
SJX862 - 4 2026-07-05
SJX804 - 4 2026-06-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-05 SJX863 - Jul 5, 11:25 UTCJul 5, 11:45 UTC20m
2026-07-05 SJX863 - Jul 5, 08:45 UTCJul 5, 10:10 UTC1h 25m
2026-07-05 SJX862 - Jul 5, 04:35 UTCJul 5, 06:30 UTC1h 55m
2026-07-05 SJX862 - Jul 5, 03:50 UTCJul 5, 04:05 UTC15m
2026-07-04 SJX236 - Jul 4, 13:05 UTCJul 4, 14:30 UTC1h 25m
2026-07-04 SJX235 - Jul 4, 11:15 UTCJul 4, 11:30 UTC15m
2026-07-04 SJX235 - Jul 4, 10:00 UTCJul 4, 10:30 UTC30m
2026-07-04 SJX821 KIX → TPE Jul 4, 04:55 UTCJul 4, 07:10 UTC2h 15m
2026-07-04 SJX820 - Jul 4, 02:35 UTCJul 4, 03:20 UTC45m
2026-07-04 SJX820 - Jul 4, 01:00 UTCJul 4, 01:20 UTC20m
2026-07-03 SJX839 - Jul 3, 13:35 UTCJul 3, 13:50 UTC15m
2026-07-03 SJX839 - Jul 3, 11:30 UTCJul 3, 13:00 UTC1h 30m
2026-07-03 SJX838 - Jul 3, 07:15 UTCJul 3, 09:35 UTC2h 20m
2026-07-03 SJX847 - Jul 3, 04:15 UTCJul 3, 05:10 UTC55m
2026-07-03 SJX847 - Jul 3, 03:15 UTCJul 3, 03:25 UTC10m
2026-07-02 SJX846 TPE → KMJ Jul 2, 23:45 UTCJul 3, 00:05 UTC20m
2026-07-02 SJX839 - Jul 2, 13:20 UTCJul 2, 13:50 UTC30m
2026-07-02 SJX839 - Jul 2, 11:15 UTCJul 2, 12:00 UTC45m
2026-07-02 SJX838 - Jul 2, 07:20 UTCJul 2, 09:30 UTC2h 10m
2026-07-02 SJX847 - Jul 2, 04:55 UTCJul 2, 05:25 UTC30m
2026-07-01 SJX846 TPE → KMJ Jul 1, 23:45 UTCJul 2, 00:00 UTC15m
2026-07-01 SJX839 - Jul 1, 11:20 UTCJul 1, 13:40 UTC2h 20m
2026-07-01 SJX838 - Jul 1, 07:15 UTCJul 1, 09:30 UTC2h 15m
2026-07-01 SJX847 - Jul 1, 05:00 UTCJul 1, 05:30 UTC30m
2026-07-01 SJX846 TPE → KMJ Jul 1, 00:05 UTCJul 1, 00:20 UTC15m
2026-06-30 SJX206 - Jun 30, 13:20 UTCJun 30, 14:40 UTC1h 20m
2026-06-30 SJX205 - Jun 30, 11:05 UTCJun 30, 11:30 UTC25m
2026-06-30 SJX205 - Jun 30, 10:05 UTCJun 30, 10:35 UTC30m
2026-06-30 SJX841 - Jun 30, 07:15 UTCJun 30, 07:50 UTC35m
2026-06-30 SJX840 - Jun 30, 03:30 UTCJun 30, 03:45 UTC15m
2026-06-30 SJX840 - Jun 30, 02:10 UTCJun 30, 02:30 UTC20m
2026-06-29 SJX805 NRT → TPE Jun 29, 12:14 UTCJun 29, 15:24 UTC3h 10m
2026-06-29 SJX804 TPE → NRT Jun 29, 07:25 UTCJun 29, 10:10 UTC2h 45m
2026-06-29 SJX234 - Jun 29, 04:45 UTCJun 29, 05:15 UTC30m
2026-06-29 SJX234 - Jun 29, 03:49 UTCJun 29, 04:04 UTC15m
2026-06-29 SJX233 - Jun 29, 01:34 UTCJun 29, 01:50 UTC15m
2026-06-29 SJX233 - Jun 29, 00:24 UTCJun 29, 01:00 UTC35m
2026-06-28 SJX746 - Jun 28, 11:50 UTCJun 28, 15:20 UTC3h 30m
2026-06-28 SJX745 TPE → BKK Jun 28, 06:10 UTCJun 28, 09:25 UTC3h 15m
2026-06-28 SJX202 - Jun 28, 03:19 UTCJun 28, 04:40 UTC1h 20m
2026-06-28 SJX201 - Jun 28, 00:15 UTCJun 28, 00:45 UTC30m
2026-06-27 SJX236 - Jun 27, 13:49 UTCJun 27, 15:19 UTC1h 30m
2026-06-27 SJX235 - Jun 27, 09:29 UTCJun 27, 10:50 UTC1h 20m
2026-06-27 SJX821 - Jun 27, 07:19 UTCJun 27, 07:39 UTC20m
2026-06-27 SJX821 - Jun 27, 05:15 UTCJun 27, 05:49 UTC35m
2026-06-27 SJX820 - Jun 27, 02:50 UTCJun 27, 03:30 UTC40m
2026-06-27 SJX820 - Jun 27, 01:24 UTCJun 27, 01:39 UTC15m
2026-06-26 SJX236 - Jun 26, 14:44 UTCJun 26, 15:15 UTC30m
2026-06-26 SJX236 - Jun 26, 13:55 UTCJun 26, 14:09 UTC15m
2026-06-26 SJX235 - Jun 26, 10:10 UTCJun 26, 10:35 UTC25m

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 8991E3 frequently asked

What is Mode-S code 8991E3?
8991E3 is an ICAO 24-bit transponder address. Allocated to Taiwan.
Where is Mode-S 8991E3 registered?
Mode-S code 8991E3 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8991E3 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8991E3, octal 42310743, decimal 9,015,779.
What flights does 8991E3 operate?
Mode-S 8991E3 has broadcast 20 distinct callsigns, including SJX839, SJX838, SJX847, SJX846, SJX821.