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sensors Mode-S transponder

8990C9

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-58508 · AIRBUS A-350-900

Hex
8990C9
Octal
42310311
Decimal
9,015,497
Country
TW
Tail
B-58508
Type
A359
Broadcasting now · callsign SJX851 · 40,000 ft
Flights observed
242
Distinct callsigns
20
Country
TW
Last broadcast
29m ago

Current position

8990C9 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 8990C9 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
SJX001 - 18 2026-06-25
SJX851 - 16 2026-07-14
SJX002 - 15 2026-06-24
SJX012 - 14 2026-07-06
SJX011 - 14 2026-07-07
SJX850 - 13 2026-07-14
SJX742 - 13 2026-07-09
SJX032 - 13 2026-07-12
SJX741 - 11 2026-07-09
SJX031 - 10 2026-07-13
SJX823 - 9 2026-06-15
SJX026 STARLUX Airlines 9 2026-06-11
SJX025 - 9 2026-06-12
SJX009 - 9 2026-07-05
SJX871 - 7 2026-07-06
SJX772 STARLUX Airlines 7 2026-05-24
SJX771 STARLUX Airlines 7 2026-05-24
SJX010 - 7 2026-07-04
SJX822 - 6 2026-06-15
SJX870 - 5 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SJX851 - Jul 14, 08:05 UTCJul 14, 08:15 UTC10m
2026-07-14 SJX850 - Jul 14, 02:40 UTCJul 14, 06:15 UTC3h 35m
2026-07-13 SJX031 - Jul 13, 19:50 UTCJul 13, 20:10 UTC20m
2026-07-13 SJX031 - Jul 13, 08:50 UTCJul 13, 18:45 UTC9h 55m
2026-07-12 SJX032 - Jul 12, 12:45 UTCJul 13, 00:01 UTC11h 15m
2026-07-11 SJX3031 - Jul 11, 17:30 UTCJul 11, 18:00 UTC30m
2026-07-11 SJX3031 - Jul 11, 06:30 UTCJul 11, 16:25 UTC9h 55m
2026-07-09 SJX032 - Jul 9, 14:10 UTCJul 9, 23:10 UTC9h 0m
2026-07-09 SJX032 - Jul 9, 12:40 UTCJul 9, 12:55 UTC15m
2026-07-09 SJX742 - Jul 9, 07:20 UTCJul 9, 10:35 UTC3h 15m
2026-07-09 SJX741 - Jul 9, 02:15 UTCJul 9, 05:15 UTC3h 0m
2026-07-08 SJX851 - Jul 8, 07:40 UTCJul 8, 11:05 UTC3h 25m
2026-07-08 SJX850 TPE → CTS Jul 8, 02:20 UTCJul 8, 05:45 UTC3h 25m
2026-07-07 SJX011 - Jul 7, 20:30 UTCJul 7, 20:50 UTC20m
2026-07-07 SJX011 - Jul 7, 08:30 UTCJul 7, 19:20 UTC10h 50m
2026-07-06 SJX012 TPE → SFO Jul 6, 16:25 UTCJul 7, 03:40 UTC11h 15m
2026-07-06 SJX871 - Jul 6, 07:40 UTCJul 6, 08:05 UTC25m
2026-07-06 SJX870 - Jul 6, 04:15 UTCJul 6, 04:40 UTC25m
2026-07-05 SJX009 - Jul 5, 06:55 UTCJul 5, 19:55 UTC13h 0m
2026-07-04 SJX010 - Jul 4, 12:30 UTCJul 5, 00:05 UTC11h 35m
2026-07-04 SJX871 - Jul 4, 07:55 UTCJul 4, 08:20 UTC25m
2026-07-04 SJX870 - Jul 4, 04:20 UTCJul 4, 04:40 UTC20m
2026-07-03 SJX031 - Jul 3, 21:10 UTCJul 3, 21:25 UTC15m
2026-07-03 SJX031 - Jul 3, 08:45 UTCJul 3, 19:40 UTC10h 55m
2026-07-02 SJX032 TPE → SEA Jul 2, 14:10 UTCJul 2, 22:50 UTC8h 40m
2026-07-02 SJX032 TPE → SEA Jul 2, 12:40 UTCJul 2, 13:00 UTC20m
2026-07-02 SJX871 - Jul 2, 07:45 UTCJul 2, 08:10 UTC25m
2026-07-02 SJX870 - Jul 2, 04:20 UTCJul 2, 04:40 UTC20m
2026-07-01 SJX803 NRT → TPE Jul 1, 07:45 UTCJul 1, 10:45 UTC3h 0m
2026-07-01 SJX802 - Jul 1, 03:15 UTCJul 1, 06:05 UTC2h 50m
2026-06-30 SJX031 SEA → TPE Jun 30, 08:30 UTCJun 30, 20:25 UTC11h 55m
2026-06-29 SJX032 TPE → SEA Jun 29, 14:09 UTCJun 29, 22:44 UTC8h 35m
2026-06-29 SJX032 TPE → SEA Jun 29, 12:39 UTCJun 29, 12:55 UTC15m
2026-06-29 SJX742 - Jun 29, 09:20 UTCJun 29, 09:44 UTC25m
2026-06-29 SJX742 - Jun 29, 06:34 UTCJun 29, 07:05 UTC30m
2026-06-29 SJX741 - Jun 29, 01:55 UTCJun 29, 04:55 UTC3h 0m
2026-06-28 SJX011 - Jun 28, 20:25 UTCJun 28, 20:50 UTC25m
2026-06-28 SJX011 - Jun 28, 08:05 UTCJun 28, 08:29 UTC25m
2026-06-27 SJX012 - Jun 27, 18:20 UTCJun 28, 03:29 UTC9h 10m
2026-06-27 SJX012 - Jun 27, 16:49 UTCJun 27, 17:09 UTC20m
2026-06-27 SJX803 - Jun 27, 08:25 UTCJun 27, 11:25 UTC3h 0m
2026-06-27 SJX802 TPE → NRT Jun 27, 03:15 UTCJun 27, 06:05 UTC2h 50m
2026-06-26 SJX851 - Jun 26, 11:20 UTCJun 26, 11:40 UTC20m
2026-06-26 SJX851 - Jun 26, 07:55 UTCJun 26, 10:15 UTC2h 20m
2026-06-26 SJX850 - Jun 26, 03:50 UTCJun 26, 05:50 UTC2h 0m
2026-06-26 SJX850 - Jun 26, 02:40 UTCJun 26, 02:54 UTC15m
2026-06-25 SJX001 - Jun 25, 07:54 UTCJun 25, 21:05 UTC13h 10m
2026-06-24 SJX002 - Jun 24, 18:50 UTCJun 25, 03:54 UTC9h 5m
2026-06-24 SJX002 - Jun 24, 16:45 UTCJun 24, 17:05 UTC20m
2026-06-24 SJX851 - Jun 24, 07:54 UTCJun 24, 11:39 UTC3h 45m

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-58508 page for operator, model, and routing details .

Mode-S 8990C9 frequently asked

What is Mode-S code 8990C9?
8990C9 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-58508.
Where is Mode-S 8990C9 registered?
Mode-S code 8990C9 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8990C9 broadcasting right now?
Yes. Mode-S 8990C9 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8990C9, octal 42310311, decimal 9,015,497.
What flights does 8990C9 operate?
Mode-S 8990C9 has broadcast 20 distinct callsigns, including SJX001, SJX851, SJX002, SJX012, SJX011.