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sensors Mode-S transponder

8990E9

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18107 · AIRBUS A-321neo

Hex
8990E9
Octal
42310351
Decimal
9,015,529
Country
TW
Tail
B-18107
Type
A21N
Broadcasting now · callsign CAL731 · 31,975 ft
Flights observed
360
Distinct callsigns
20
Country
TW
Last broadcast
2h ago

Current position

8990E9 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 8990E9 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
CAL909 - 19 2026-07-02
CAL910 - 13 2026-07-02
CAL151 - 13 2026-07-08
CAL852 - 12 2026-07-07
CAL107 - 12 2026-06-23
CAL106 - 12 2026-06-22
CAL123 - 11 2026-07-01
CAL851 China Airlines 10 2026-07-06
CAL837 - 10 2026-07-01
CAL838 China Airlines 9 2026-07-01
CAL150 - 9 2026-07-07
CAL794 - 8 2026-06-20
CAL755 - 8 2026-07-04
CAL756 China Airlines 7 2026-07-04
CAL512 - 6 2026-06-24
CAL189 - 6 2026-06-21
CAL122 - 6 2026-07-01
MDA991 - 5 2026-07-10
CAL903 - 5 2026-07-09
CAL705 - 5 2026-06-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CAL7842 KHH → TPE Jul 13, 23:30 UTCJul 14, 00:05 UTC35m
2026-07-13 CAL583 KHH → KHH Jul 13, 09:10 UTCJul 13, 14:30 UTC5h 20m
2026-07-12 CAL7843 - Jul 12, 11:15 UTCJul 12, 11:50 UTC35m
2026-07-12 CAL3195 - Jul 12, 08:20 UTCJul 12, 09:00 UTC40m
2026-07-12 CAL3195 - Jul 12, 07:01 UTCJul 12, 07:10 UTC10m
2026-07-10 CAL194 - Jul 10, 06:55 UTCJul 10, 07:20 UTC25m
2026-07-10 MDA992 - Jul 10, 04:20 UTCJul 10, 05:25 UTC1h 5m
2026-07-10 MDA991 - Jul 10, 01:10 UTCJul 10, 02:05 UTC55m
2026-07-09 CAL764 - Jul 9, 20:05 UTCJul 9, 23:20 UTC3h 15m
2026-07-09 CAL764 - Jul 9, 18:25 UTCJul 9, 18:35 UTC10m
2026-07-09 CAL763 - Jul 9, 16:20 UTCJul 9, 16:35 UTC15m
2026-07-09 CAL763 - Jul 9, 11:40 UTCJul 9, 14:55 UTC3h 15m
2026-07-09 CAL904 HKG → TPE Jul 9, 03:20 UTCJul 9, 04:40 UTC1h 20m
2026-07-09 CAL903 TPE → HKG Jul 9, 00:25 UTCJul 9, 01:45 UTC1h 20m
2026-07-08 CAL916 - Jul 8, 10:50 UTCJul 8, 12:10 UTC1h 20m
2026-07-08 CAL915 - Jul 8, 07:00 UTCJul 8, 08:40 UTC1h 40m
2026-07-08 CAL151 - Jul 8, 03:10 UTCJul 8, 03:35 UTC25m
2026-07-08 CAL151 - Jul 8, 01:10 UTCJul 8, 01:50 UTC40m
2026-07-07 CAL150 - Jul 7, 09:30 UTCJul 7, 11:55 UTC2h 25m
2026-07-07 CAL852 - Jul 7, 04:35 UTCJul 7, 08:00 UTC3h 25m
2026-07-06 CAL851 TPE → CNX Jul 6, 23:55 UTCJul 7, 03:15 UTC3h 20m
2026-07-06 CAL920 HKG → TPE Jul 6, 13:15 UTCJul 6, 14:40 UTC1h 25m
2026-07-06 CAL919 - Jul 6, 10:05 UTCJul 6, 11:40 UTC1h 35m
2026-07-06 CAL852 - Jul 6, 05:15 UTCJul 6, 08:40 UTC3h 25m
2026-07-06 CAL851 TPE → CNX Jul 6, 00:25 UTCJul 6, 03:55 UTC3h 30m
2026-07-05 CAL179 - Jul 5, 10:25 UTCJul 5, 12:50 UTC2h 25m
2026-07-05 CAL178 - Jul 5, 07:00 UTCJul 5, 09:10 UTC2h 10m
2026-07-05 MDA991 TPE → TPE Jul 5, 01:15 UTCJul 5, 05:30 UTC4h 15m
2026-07-04 CAL756 SIN → TPE Jul 4, 21:35 UTCJul 4, 22:45 UTC1h 10m
2026-07-04 CAL756 SIN → TPE Jul 4, 18:20 UTCJul 4, 18:30 UTC10m
2026-07-04 CAL755 - Jul 4, 12:20 UTCJul 4, 16:10 UTC3h 50m
2026-07-04 CAL852 - Jul 4, 05:35 UTCJul 4, 09:10 UTC3h 35m
2026-07-04 CAL851 TPE → CNX Jul 4, 00:50 UTCJul 4, 04:15 UTC3h 25m
2026-07-03 CAL522 - Jul 3, 11:10 UTCJul 3, 12:35 UTC1h 25m
2026-07-03 CAL521 - Jul 3, 06:30 UTCJul 3, 07:40 UTC1h 10m
2026-07-03 CAL151 - Jul 3, 03:25 UTCJul 3, 03:45 UTC20m
2026-07-03 CAL151 - Jul 3, 01:05 UTCJul 3, 01:50 UTC45m
2026-07-02 CAL150 - Jul 2, 09:30 UTCJul 2, 11:35 UTC2h 5m
2026-07-02 CAL910 HKG → TPE Jul 2, 06:25 UTCJul 2, 07:50 UTC1h 25m
2026-07-02 CAL909 TPE → HKG Jul 2, 03:20 UTCJul 2, 04:40 UTC1h 20m
2026-07-01 CAL838 BKK → TPE Jul 1, 22:20 UTCJul 1, 23:30 UTC1h 10m
2026-07-01 CAL837 - Jul 1, 17:55 UTCJul 1, 18:05 UTC10m
2026-07-01 CAL837 - Jul 1, 14:50 UTCJul 1, 15:45 UTC55m
2026-07-01 CAL123 - Jul 1, 12:45 UTCJul 1, 13:15 UTC30m
2026-07-01 CAL122 - Jul 1, 09:25 UTCJul 1, 09:45 UTC20m
2026-07-01 CAL852 - Jul 1, 04:30 UTCJul 1, 07:45 UTC3h 15m
2026-07-01 CAL851 TPE → CNX Jul 1, 00:05 UTCJul 1, 03:25 UTC3h 20m
2026-06-30 CAL518 - Jun 30, 16:15 UTCJun 30, 16:50 UTC35m
2026-06-30 CAL517 - Jun 30, 07:45 UTCJun 30, 08:05 UTC20m
2026-06-30 MDA991 - Jun 30, 01:14 UTCJun 30, 05:45 UTC4h 30m

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-18107 page for operator, model, and routing details .

Mode-S 8990E9 frequently asked

What is Mode-S code 8990E9?
8990E9 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18107.
Where is Mode-S 8990E9 registered?
Mode-S code 8990E9 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8990E9 broadcasting right now?
Yes. Mode-S 8990E9 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8990E9, octal 42310351, decimal 9,015,529.
What flights does 8990E9 operate?
Mode-S 8990E9 has broadcast 20 distinct callsigns, including CAL909, CAL910, CAL151, CAL852, CAL107.