Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

8990A9

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18617 · BOEING 737-800

Hex
8990A9
Octal
42310251
Decimal
9,015,465
Country
TW
Tail
B-18617
Type
B738
No current signal · last broadcast 1h ago
Flights observed
349
Distinct callsigns
20
Country
TW
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 8990A9.

Country allocation

The ICAO 24-bit address 8990A9 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
CAL109 - 12 2026-07-04
CAL851 - 10 2026-07-09
CAL794 - 9 2026-07-08
CAL129 China Airlines 9 2026-05-09
CAL910 - 8 2026-07-14
CAL852 - 8 2026-07-09
CAL793 - 8 2026-07-08
CAL189 - 8 2026-06-20
CAL151 China Airlines 8 2026-06-10
CAL113 - 8 2026-07-12
CAL923 - 7 2026-06-30
CAL909 - 7 2026-07-14
CAL756 China Airlines 7 2026-07-07
CAL731 - 7 2026-06-28
CAL150 China Airlines 7 2026-06-09
CAL128 China Airlines 7 2026-05-09
CAL112 - 7 2026-07-11
CAL108 - 7 2026-07-04
CAL755 - 6 2026-07-07
CAL601 - 6 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CAL910 - Jul 14, 06:50 UTCJul 14, 08:15 UTC1h 25m
2026-07-14 CAL909 - Jul 14, 03:55 UTCJul 14, 05:15 UTC1h 20m
2026-07-13 CAL704 - Jul 13, 09:15 UTCJul 13, 11:05 UTC1h 50m
2026-07-13 CAL703 - Jul 13, 05:35 UTCJul 13, 07:25 UTC1h 50m
2026-07-13 CAL602 HKG → TPE Jul 13, 02:30 UTCJul 13, 03:55 UTC1h 25m
2026-07-12 CAL601 TPE → HKG Jul 12, 23:25 UTCJul 13, 00:45 UTC1h 20m
2026-07-12 CAL789 TPE → TPE Jul 12, 07:01 UTCJul 12, 13:05 UTC6h 5m
2026-07-12 CAL113 - Jul 12, 05:10 UTCJul 12, 05:35 UTC25m
2026-07-12 CAL113 - Jul 12, 03:35 UTCJul 12, 04:01 UTC25m
2026-07-11 CAL112 TPE → HIJ Jul 11, 23:40 UTCJul 12, 01:40 UTC2h 0m
2026-07-10 CAL910 HKG → TPE Jul 10, 06:25 UTCJul 10, 07:50 UTC1h 25m
2026-07-10 CAL909 TPE → HKG Jul 10, 03:25 UTCJul 10, 04:40 UTC1h 15m
2026-07-09 CAL852 - Jul 9, 05:25 UTCJul 9, 08:50 UTC3h 25m
2026-07-09 CAL851 - Jul 9, 00:35 UTCJul 9, 03:55 UTC3h 20m
2026-07-08 CAL794 - Jul 8, 11:35 UTCJul 8, 14:10 UTC2h 35m
2026-07-08 CAL793 - Jul 8, 06:50 UTCJul 8, 09:30 UTC2h 40m
2026-07-08 CAL904 HKG → TPE Jul 8, 03:15 UTCJul 8, 04:35 UTC1h 20m
2026-07-08 CAL903 - Jul 8, 00:25 UTCJul 8, 01:45 UTC1h 20m
2026-07-07 CAL756 SIN → TPE Jul 7, 21:40 UTCJul 7, 22:40 UTC1h 0m
2026-07-07 CAL756 SIN → TPE Jul 7, 18:15 UTCJul 7, 18:25 UTC10m
2026-07-07 CAL755 - Jul 7, 15:45 UTCJul 7, 16:20 UTC35m
2026-07-07 CAL755 - Jul 7, 12:10 UTCJul 7, 12:50 UTC40m
2026-07-07 CAL7916 RGN → TPE Jul 7, 05:00 UTCJul 7, 08:50 UTC3h 50m
2026-07-06 CAL7915 TPE → RGN Jul 6, 23:50 UTCJul 7, 03:30 UTC3h 40m
2026-07-06 CAL195 - Jul 6, 10:45 UTCJul 6, 11:40 UTC55m
2026-07-06 CAL195 - Jul 6, 09:55 UTCJul 6, 10:05 UTC10m
2026-07-06 CAL194 - Jul 6, 07:00 UTCJul 6, 07:10 UTC10m
2026-07-06 MDA992 - Jul 6, 04:20 UTCJul 6, 05:35 UTC1h 15m
2026-07-06 MDA991 - Jul 6, 01:05 UTCJul 6, 01:50 UTC45m
2026-07-05 CAL838 BKK → TPE Jul 5, 20:05 UTCJul 5, 23:30 UTC3h 25m
2026-07-05 CAL837 TPE → BKK Jul 5, 14:50 UTCJul 5, 18:05 UTC3h 15m
2026-07-05 CAL704 - Jul 5, 09:15 UTCJul 5, 11:00 UTC1h 45m
2026-07-05 CAL703 TPE → MNL Jul 5, 05:55 UTCJul 5, 07:55 UTC2h 0m
2026-07-05 CAL121 - Jul 5, 03:40 UTCJul 5, 04:30 UTC50m
2026-07-05 CAL120 - Jul 5, 01:15 UTCJul 5, 01:30 UTC15m
2026-07-05 CAL120 - Jul 5, 00:20 UTCJul 5, 00:45 UTC25m
2026-07-04 CAL109 - Jul 4, 14:05 UTCJul 4, 14:30 UTC25m
2026-07-04 CAL109 - Jul 4, 11:25 UTCJul 4, 12:45 UTC1h 20m
2026-07-04 CAL108 TPE → NRT Jul 4, 06:50 UTCJul 4, 09:50 UTC3h 0m
2026-07-04 CAL602 HKG → TPE Jul 4, 02:45 UTCJul 4, 04:10 UTC1h 25m
2026-07-04 CAL601 TPE → HKG Jul 4, 00:55 UTCJul 4, 01:15 UTC20m
2026-07-03 CAL601 TPE → HKG Jul 3, 23:55 UTCJul 4, 00:25 UTC30m
2026-07-03 CAL109 - Jul 3, 14:30 UTCJul 3, 14:45 UTC15m
2026-07-03 CAL109 - Jul 3, 11:45 UTCJul 3, 13:10 UTC1h 25m
2026-07-03 CAL108 - Jul 3, 07:10 UTCJul 3, 09:55 UTC2h 45m
2026-07-03 CAL113 HIJ → TPE Jul 3, 03:05 UTCJul 3, 05:30 UTC2h 25m
2026-07-02 CAL112 TPE → HIJ Jul 2, 23:30 UTCJul 3, 01:40 UTC2h 10m
2026-07-02 CAL109 NRT → TPE Jul 2, 11:35 UTCJul 2, 14:50 UTC3h 15m
2026-07-02 CAL108 - Jul 2, 07:10 UTCJul 2, 10:00 UTC2h 50m
2026-07-02 CAL191 PUS → TPE Jul 2, 01:35 UTCJul 2, 03:30 UTC1h 55m

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-18617 page for operator, model, and routing details .

Mode-S 8990A9 frequently asked

What is Mode-S code 8990A9?
8990A9 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18617.
Where is Mode-S 8990A9 registered?
Mode-S code 8990A9 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8990A9 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 8990A9, octal 42310251, decimal 9,015,465.
What flights does 8990A9 operate?
Mode-S 8990A9 has broadcast 20 distinct callsigns, including CAL109, CAL851, CAL794, CAL129, CAL910.