Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

8990A8

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B18112 · AIRBUS A-321neo

Hex
8990A8
Octal
42310250
Decimal
9,015,464
Country
TW
Tail
B18112
Type
A21N
No current signal · last broadcast 11h ago
Flights observed
177
Distinct callsigns
20
Country
TW
Last broadcast
11h ago

Last known position

Most recent position reported by Mode-S 8990A8.

Country allocation

The ICAO 24-bit address 8990A8 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
CAL915 China Airlines 6 2026-05-30
CAL903 China Airlines 6 2026-05-24
CAL852 China Airlines 6 2026-06-02
CAL512 China Airlines 6 2026-05-29
CAL851 China Airlines 5 2026-06-01
CAL916 China Airlines 4 2026-05-30
CAL909 China Airlines 4 2026-05-21
CAL601 China Airlines 4 2026-05-17
CAL527 China Airlines 4 2026-05-15
CAL2171 China Airlines 4 2026-04-27
CAL109 China Airlines 4 2026-05-25
CAL910 China Airlines 3 2026-05-21
CAL904 China Airlines 3 2026-05-24
CAL793 China Airlines 3 2026-06-01
CAL602 China Airlines 3 2026-05-17
CAL528 China Airlines 3 2026-05-15
CAL511 China Airlines 3 2026-05-28
CAL195 China Airlines 3 2026-04-28
CAL194 China Airlines 3 2026-04-28
CAL189 China Airlines 3 2026-05-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 CAL852 CNX → TPE Jun 2, 04:35 UTCJun 2, 08:00 UTC3h 25m
2026-06-01 CAL851 TPE → CNX Jun 1, 23:50 UTCJun 2, 03:05 UTC3h 15m
2026-06-01 CAL794 HAN → TPE Jun 1, 11:10 UTCJun 1, 13:35 UTC2h 25m
2026-06-01 CAL793 TPE → HAN Jun 1, 06:50 UTCJun 1, 09:10 UTC2h 20m
2026-05-31 CAL129 FUK → TPE May 31, 12:20 UTCMay 31, 12:45 UTC25m
2026-05-31 CAL129 FUK → TPE May 31, 10:50 UTCMay 31, 11:00 UTC10m
2026-05-31 CAL188 TPE → PUS May 31, 00:10 UTCMay 31, 00:30 UTC20m
2026-05-30 CAL916 HKG → TPE May 30, 09:45 UTCMay 30, 11:05 UTC1h 20m
2026-05-30 CAL915 TPE → HKG May 30, 06:50 UTCMay 30, 08:05 UTC1h 15m
2026-05-29 CAL191 PUS → TPE May 29, 22:30 UTCMay 30, 03:30 UTC5h 0m
2026-05-29 CAL506 PVG → TPE May 29, 09:50 UTCMay 29, 14:40 UTC4h 50m
2026-05-29 CAL512 PEK → TPE May 29, 06:45 UTCMay 29, 07:15 UTC30m
2026-05-29 CAL512 PEK → TPE May 29, 04:40 UTCMay 29, 04:50 UTC10m
2026-05-28 CAL511 TPE → PEK May 28, 23:55 UTCMay 29, 00:20 UTC25m
2026-05-28 CAL731 TPE → PEN May 28, 01:50 UTCMay 28, 11:40 UTC9h 50m
2026-05-27 CAL756 SIN → TPE May 27, 21:20 UTCMay 27, 22:35 UTC1h 15m
2026-05-27 CAL755 TPE → SIN May 27, 12:25 UTCMay 27, 16:15 UTC3h 50m
2026-05-27 CAL512 PEK → TPE May 27, 07:00 UTCMay 27, 07:25 UTC25m
2026-05-27 CAL512 PEK → TPE May 27, 04:49 UTCMay 27, 04:59 UTC10m
2026-05-26 CAL511 TPE → PEK May 26, 23:54 UTCMay 27, 00:25 UTC30m
2026-05-26 CAL924 HKG → TPE May 26, 13:34 UTCMay 26, 15:00 UTC1h 25m
2026-05-26 CAL923 TPE → HKG May 26, 11:30 UTCMay 26, 11:44 UTC15m
2026-05-26 CAL923 TPE → HKG May 26, 10:25 UTCMay 26, 10:54 UTC30m
2026-05-26 CAL153 KIX → TPE May 26, 05:25 UTCMay 26, 07:49 UTC2h 25m
2026-05-26 CAL152 TPE → KIX May 26, 01:14 UTCMay 26, 03:35 UTC2h 20m
2026-05-25 CAL109 NRT → TPE May 25, 14:10 UTCMay 25, 14:35 UTC25m
2026-05-25 CAL109 NRT → TPE May 25, 11:40 UTCMay 25, 12:50 UTC1h 10m
2026-05-25 CAL108 TPE → NRT May 25, 07:10 UTCMay 25, 10:10 UTC3h 0m
2026-05-25 MDA992 - May 25, 04:40 UTCMay 25, 05:25 UTC45m
2026-05-24 CAL793 TPE → HAN May 24, 06:55 UTCMay 24, 13:35 UTC6h 40m
2026-05-24 CAL904 HKG → TPE May 24, 03:25 UTCMay 24, 04:50 UTC1h 25m
2026-05-24 CAL903 TPE → HKG May 24, 01:20 UTCMay 24, 01:35 UTC15m
2026-05-24 CAL903 TPE → HKG May 24, 00:20 UTCMay 24, 00:50 UTC30m
2026-05-23 CAL129 FUK → TPE May 23, 12:00 UTCMay 23, 12:25 UTC25m
2026-05-23 CAL128 TPE → FUK May 23, 07:15 UTCMay 23, 07:35 UTC20m
2026-05-23 CAL189 PUS → TPE May 23, 04:50 UTCMay 23, 05:20 UTC30m
2026-05-23 CAL188 TPE → PUS May 23, 00:15 UTCMay 23, 00:35 UTC20m
2026-05-22 CAL122 TPE → OKA May 22, 09:20 UTCMay 22, 13:30 UTC4h 10m
2026-05-22 CAL852 CNX → TPE May 22, 06:20 UTCMay 22, 07:45 UTC1h 25m
2026-05-22 CAL852 CNX → TPE May 22, 04:30 UTCMay 22, 04:45 UTC15m
2026-05-21 CAL851 TPE → CNX May 21, 23:45 UTCMay 22, 03:05 UTC3h 20m
2026-05-21 CAL920 HKG → TPE May 21, 12:55 UTCMay 21, 14:15 UTC1h 20m
2026-05-21 CAL919 TPE → HKG May 21, 09:20 UTCMay 21, 10:35 UTC1h 15m
2026-05-21 CAL910 HKG → TPE May 21, 07:15 UTCMay 21, 07:40 UTC25m
2026-05-21 CAL910 HKG → TPE May 21, 06:20 UTCMay 21, 06:40 UTC20m
2026-05-21 CAL909 TPE → HKG May 21, 04:20 UTCMay 21, 04:35 UTC15m
2026-05-21 CAL909 TPE → HKG May 21, 03:15 UTCMay 21, 03:45 UTC30m
2026-05-20 CAL838 BKK → TPE May 20, 20:00 UTCMay 20, 23:10 UTC3h 10m
2026-05-20 CAL837 TPE → BKK May 20, 14:55 UTCMay 20, 18:10 UTC3h 15m
2026-05-20 CAL123 OKA → TPE May 20, 13:05 UTCMay 20, 13:30 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.

Prefer a tail-number view? See the B18112 page for operator, model, and routing details .

Mode-S 8990A8 frequently asked

What is Mode-S code 8990A8?
8990A8 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B18112.
Where is Mode-S 8990A8 registered?
Mode-S code 8990A8 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8990A8 broadcasting right now?
No active broadcast right now. Last signal was 11h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8990A8, octal 42310250, decimal 9,015,464.
What flights does 8990A8 operate?
Mode-S 8990A8 has broadcast 20 distinct callsigns, including CAL915, CAL903, CAL852, CAL512, CAL851.