Apparatus

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sensors Mode-S transponder

8991E6

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-58503 · AIRBUS A-350-900

Hex
8991E6
Octal
42310746
Decimal
9,015,782
Country
TW
Tail
B-58503
Type
A359
Broadcasting now · callsign SJX821 · 40,000 ft
Flights observed
252
Distinct callsigns
20
Country
TW
Last broadcast
2h ago

Current position

8991E6 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 8991E6 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 - 23 2026-07-11
SJX032 - 21 2026-07-10
SJX772 - 18 2026-07-10
SJX771 - 16 2026-07-05
SJX742 - 14 2026-07-07
SJX002 - 14 2026-07-08
SJX012 - 13 2026-07-05
SJX851 - 12 2026-07-13
SJX001 - 12 2026-07-09
SJX011 - 11 2026-07-06
SJX823 STARLUX Airlines 10 2026-06-06
SJX822 STARLUX Airlines 9 2026-06-06
SJX741 - 9 2026-07-07
SJX010 - 9 2026-07-01
SJX009 - 9 2026-07-02
SJX871 - 8 2026-07-08
SJX870 - 8 2026-07-08
SJX850 - 8 2026-07-13
SJX235 STARLUX Airlines 5 2026-04-27
SJX821 STARLUX Airlines 3 2026-04-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SJX820 TPE → KIX Jul 14, 00:55 UTCJul 14, 03:10 UTC2h 15m
2026-07-13 SJX851 - Jul 13, 07:55 UTCJul 13, 11:15 UTC3h 20m
2026-07-13 SJX850 TPE → CTS Jul 13, 02:30 UTCJul 13, 06:10 UTC3h 40m
2026-07-12 SJX841 - Jul 12, 06:20 UTCJul 12, 08:15 UTC1h 55m
2026-07-12 SJX840 - Jul 12, 03:30 UTCJul 12, 03:50 UTC20m
2026-07-12 SJX840 - Jul 12, 02:05 UTCJul 12, 02:30 UTC25m
2026-07-11 SJX031 - Jul 11, 08:25 UTCJul 11, 19:45 UTC11h 20m
2026-07-10 SJX032 - Jul 10, 12:45 UTCJul 10, 21:45 UTC9h 0m
2026-07-10 SJX032 - Jul 10, 11:15 UTCJul 10, 11:30 UTC15m
2026-07-10 SJX772 - Jul 10, 05:20 UTCJul 10, 09:35 UTC4h 15m
2026-07-10 SJX3771 - Jul 10, 02:50 UTCJul 10, 03:10 UTC20m
2026-07-09 SJX3771 - Jul 9, 23:20 UTCJul 10, 00:05 UTC45m
2026-07-09 SJX001 - Jul 9, 07:55 UTCJul 9, 20:55 UTC13h 0m
2026-07-08 SJX002 - Jul 8, 16:30 UTCJul 9, 04:15 UTC11h 45m
2026-07-08 SJX871 - Jul 8, 07:10 UTCJul 8, 08:10 UTC1h 0m
2026-07-08 SJX870 - Jul 8, 04:15 UTCJul 8, 04:40 UTC25m
2026-07-07 SJX742 - Jul 7, 06:30 UTCJul 7, 09:50 UTC3h 20m
2026-07-07 SJX741 TPE → BKK Jul 7, 01:30 UTCJul 7, 04:35 UTC3h 5m
2026-07-06 SJX011 SFO → TPE Jul 6, 08:25 UTCJul 6, 20:40 UTC12h 15m
2026-07-05 SJX012 TPE → SFO Jul 5, 16:30 UTCJul 6, 03:30 UTC11h 0m
2026-07-05 SJX772 - Jul 5, 09:25 UTCJul 5, 10:30 UTC1h 5m
2026-07-05 SJX771 - Jul 5, 03:55 UTCJul 5, 04:15 UTC20m
2026-07-05 SJX771 - Jul 5, 00:35 UTCJul 5, 01:30 UTC55m
2026-07-04 SJX001 - Jul 4, 08:05 UTCJul 4, 21:10 UTC13h 5m
2026-07-03 SJX002 - Jul 3, 16:40 UTCJul 4, 04:10 UTC11h 30m
2026-07-03 SJX851 - Jul 3, 10:55 UTCJul 3, 11:15 UTC20m
2026-07-03 SJX851 - Jul 3, 07:45 UTCJul 3, 09:45 UTC2h 0m
2026-07-03 SJX850 TPE → CTS Jul 3, 02:30 UTCJul 3, 05:45 UTC3h 15m
2026-07-02 SJX009 - Jul 2, 19:45 UTCJul 2, 20:10 UTC25m
2026-07-02 SJX009 - Jul 2, 07:05 UTCJul 2, 08:15 UTC1h 10m
2026-07-01 SJX010 TPE → ONT Jul 1, 12:40 UTCJul 2, 00:10 UTC11h 30m
2026-07-01 SJX871 - Jul 1, 07:45 UTCJul 1, 08:15 UTC30m
2026-07-01 SJX870 - Jul 1, 04:25 UTCJul 1, 04:40 UTC15m
2026-06-30 SJX772 - Jun 30, 06:55 UTCJun 30, 11:05 UTC4h 10m
2026-06-30 SJX771 - Jun 30, 04:35 UTCJun 30, 04:55 UTC20m
2026-06-30 SJX771 - Jun 30, 01:04 UTCJun 30, 02:05 UTC1h 1m
2026-06-29 SJX011 - Jun 29, 08:14 UTCJun 29, 20:59 UTC12h 45m
2026-06-28 SJX012 - Jun 28, 17:55 UTCJun 29, 03:10 UTC9h 15m
2026-06-28 SJX012 - Jun 28, 16:29 UTCJun 28, 16:45 UTC15m
2026-06-28 SJX772 - Jun 28, 06:24 UTCJun 28, 10:55 UTC4h 30m
2026-06-28 SJX771 - Jun 28, 03:59 UTCJun 28, 04:20 UTC20m
2026-06-28 SJX771 - Jun 28, 00:25 UTCJun 28, 01:19 UTC55m
2026-06-27 SJX011 SFO → TPE Jun 27, 08:55 UTCJun 27, 21:34 UTC12h 40m
2026-06-26 SJX012 - Jun 26, 18:39 UTCJun 27, 03:55 UTC9h 15m
2026-06-26 SJX012 - Jun 26, 17:09 UTCJun 26, 17:25 UTC15m
2026-06-26 SJX871 - Jun 26, 10:20 UTCJun 26, 10:44 UTC25m
2026-06-26 SJX870 - Jun 26, 06:45 UTCJun 26, 07:05 UTC20m
2026-06-25 SJX772 - Jun 25, 06:35 UTCJun 25, 10:59 UTC4h 25m
2026-06-25 SJX771 - Jun 25, 00:29 UTCJun 25, 01:24 UTC55m
2026-06-24 SJX011 - Jun 24, 08:14 UTCJun 24, 20:54 UTC12h 40m

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-58503 page for operator, model, and routing details .

Mode-S 8991E6 frequently asked

What is Mode-S code 8991E6?
8991E6 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-58503.
Where is Mode-S 8991E6 registered?
Mode-S code 8991E6 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8991E6 broadcasting right now?
Yes. Mode-S 8991E6 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8991E6, octal 42310746, decimal 9,015,782.
What flights does 8991E6 operate?
Mode-S 8991E6 has broadcast 20 distinct callsigns, including SJX031, SJX032, SJX772, SJX771, SJX742.