Apparatus

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sensors Mode-S transponder

8990AA

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18612 · BOEING 737-800

Hex
8990AA
Octal
42310252
Decimal
9,015,466
Country
TW
Tail
B-18612
Type
B738
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
412
Distinct callsigns
20
Country
TW
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S 8990AA.

Country allocation

The ICAO 24-bit address 8990AA 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
CAL107 China Airlines 16 2026-07-21
CAL755 China Airlines 14 2026-07-26
CAL155 China Airlines 14 2026-07-17
CAL837 China Airlines 13 2026-07-23
CAL187 - 13 2026-07-17
CAL756 China Airlines 12 2026-07-26
CAL186 - 12 2026-07-17
CAL838 China Airlines 11 2026-07-23
CAL731 China Airlines 11 2026-07-24
CAL154 - 11 2026-07-16
CAL131 China Airlines 11 2026-07-26
CAL732 China Airlines 10 2026-07-24
CAL106 China Airlines 10 2026-07-20
CAL527 China Airlines 9 2026-06-14
CAL188 - 9 2026-07-10
CAL130 China Airlines 9 2026-07-26
CAL909 China Airlines 8 2026-06-05
CAL528 China Airlines 8 2026-06-14
CAL112 China Airlines 8 2026-07-02
CAL851 China Airlines 7 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CAL756 SIN → TPE Jul 26, 18:35 UTCJul 26, 22:30 UTC3h 55m
2026-07-26 CAL755 TPE → SIN Jul 26, 12:20 UTCJul 26, 16:30 UTC4h 10m
2026-07-26 CAL131 CTS → TPE Jul 26, 10:05 UTCJul 26, 10:35 UTC30m
2026-07-26 CAL131 CTS → TPE Jul 26, 07:00 UTCJul 26, 09:10 UTC2h 10m
2026-07-26 CAL130 TPE → CTS Jul 26, 00:55 UTCJul 26, 04:30 UTC3h 35m
2026-07-25 CAL131 CTS → TPE Jul 25, 10:10 UTCJul 25, 10:25 UTC15m
2026-07-25 CAL131 CTS → TPE Jul 25, 06:55 UTCJul 25, 09:05 UTC2h 10m
2026-07-25 CAL130 TPE → CTS Jul 25, 03:30 UTCJul 25, 05:30 UTC2h 0m
2026-07-25 CAL130 TPE → CTS Jul 25, 02:00 UTCJul 25, 02:15 UTC15m
2026-07-24 CAL7846 TSA → TPE Jul 24, 23:45 UTCJul 25, 00:00 UTC15m
2026-07-24 CAL732 PEN → TPE Jul 24, 08:50 UTCJul 24, 13:30 UTC4h 40m
2026-07-24 CAL732 PEN → TPE Jul 24, 08:00 UTCJul 24, 08:10 UTC10m
2026-07-24 CAL731 TPE → PEN Jul 24, 05:55 UTCJul 24, 06:10 UTC15m
2026-07-24 CAL731 TPE → PEN Jul 24, 02:10 UTCJul 24, 05:25 UTC3h 15m
2026-07-23 CAL838 BKK → TPE Jul 23, 20:20 UTCJul 23, 23:30 UTC3h 10m
2026-07-23 CAL837 TPE → BKK Jul 23, 15:00 UTCJul 23, 18:25 UTC3h 25m
2026-07-23 CAL123 OKA → TPE Jul 23, 12:40 UTCJul 23, 13:35 UTC55m
2026-07-23 CAL122 TPE → OKA Jul 23, 10:35 UTCJul 23, 10:45 UTC10m
2026-07-23 CAL122 TPE → OKA Jul 23, 09:30 UTCJul 23, 10:00 UTC30m
2026-07-23 CAL852 CNX → TPE Jul 23, 04:40 UTCJul 23, 08:00 UTC3h 20m
2026-07-22 CAL851 TPE → CNX Jul 22, 23:45 UTCJul 23, 03:05 UTC3h 20m
2026-07-22 CAL027 ROR → TPE Jul 22, 13:30 UTCJul 22, 13:55 UTC25m
2026-07-22 CAL028 - Jul 22, 05:05 UTCJul 22, 05:25 UTC20m
2026-07-22 CAL395 KMJ → TPE Jul 22, 03:05 UTCJul 22, 03:20 UTC15m
2026-07-22 CAL395 KMJ → TPE Jul 22, 01:35 UTCJul 22, 01:45 UTC10m
2026-07-21 CAL394 TPE → KMJ Jul 21, 23:45 UTCJul 22, 00:00 UTC15m
2026-07-21 CAL394 TPE → KMJ Jul 21, 22:10 UTCJul 21, 23:00 UTC50m
2026-07-21 CAL916 HKG → TPE Jul 21, 10:10 UTCJul 21, 11:35 UTC1h 25m
2026-07-21 CAL915 TPE → HKG Jul 21, 06:45 UTCJul 21, 08:10 UTC1h 25m
2026-07-21 CAL107 NRT → TPE Jul 21, 03:40 UTCJul 21, 03:55 UTC15m
2026-07-21 CAL107 NRT → TPE Jul 21, 01:00 UTCJul 21, 02:25 UTC1h 25m
2026-07-20 CAL106 TPE → NRT Jul 20, 09:15 UTCJul 20, 12:20 UTC3h 5m
2026-07-20 CAL512 - Jul 20, 07:15 UTCJul 20, 07:45 UTC30m
2026-07-20 CAL512 - Jul 20, 05:00 UTCJul 20, 05:10 UTC10m
2026-07-20 CAL511 - Jul 20, 00:25 UTCJul 20, 01:10 UTC45m
2026-07-19 CAL179 - Jul 19, 12:15 UTCJul 19, 12:40 UTC25m
2026-07-19 CAL179 - Jul 19, 10:25 UTCJul 19, 11:15 UTC50m
2026-07-19 CAL178 - Jul 19, 06:55 UTCJul 19, 09:05 UTC2h 10m
2026-07-19 CAL904 HKG → TPE Jul 19, 03:45 UTCJul 19, 05:20 UTC1h 35m
2026-07-19 CAL903 TPE → HKG Jul 19, 00:40 UTCJul 19, 02:15 UTC1h 35m
2026-07-18 CAL732 - Jul 18, 10:40 UTCJul 18, 11:50 UTC1h 10m
2026-07-18 CAL732 - Jul 18, 07:30 UTCJul 18, 07:40 UTC10m
2026-07-18 CAL731 TPE → PEN Jul 18, 02:05 UTCJul 18, 06:00 UTC3h 56m
2026-07-17 CAL838 BKK → TPE Jul 17, 20:04 UTCJul 17, 23:35 UTC3h 30m
2026-07-17 CAL837 - Jul 17, 17:55 UTCJul 17, 18:05 UTC10m
2026-07-17 CAL837 - Jul 17, 14:55 UTCJul 17, 15:55 UTC1h 0m
2026-07-17 CAL187 PUS → TPE Jul 17, 11:15 UTCJul 17, 13:05 UTC1h 50m
2026-07-17 CAL186 - Jul 17, 09:40 UTCJul 17, 10:00 UTC20m
2026-07-17 CAL186 - Jul 17, 08:10 UTCJul 17, 08:35 UTC25m
2026-07-17 CAL155 NGO → TPE Jul 17, 05:55 UTCJul 17, 06:20 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 B-18612 page for operator, model, and routing details .

Mode-S 8990AA frequently asked

What is Mode-S code 8990AA?
8990AA is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18612.
Where is Mode-S 8990AA registered?
Mode-S code 8990AA is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8990AA broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8990AA, octal 42310252, decimal 9,015,466.
What flights does 8990AA operate?
Mode-S 8990AA has broadcast 20 distinct callsigns, including CAL107, CAL755, CAL155, CAL837, CAL187.