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 27m ago
Flights observed
351
Distinct callsigns
20
Country
TW
Last broadcast
27m ago

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 - 14 2026-07-14
CAL755 - 13 2026-07-09
CAL187 - 12 2026-07-01
CAL155 - 12 2026-07-05
CAL756 - 11 2026-07-09
CAL837 - 10 2026-07-08
CAL186 - 10 2026-07-01
CAL154 China Airlines 10 2026-07-05
CAL838 China Airlines 9 2026-07-08
CAL527 China Airlines 9 2026-06-14
CAL188 - 9 2026-07-10
CAL106 - 9 2026-07-13
CAL909 China Airlines 8 2026-06-05
CAL731 - 8 2026-07-08
CAL528 China Airlines 8 2026-06-14
CAL112 China Airlines 8 2026-07-02
CAL195 - 7 2026-07-02
CAL194 - 7 2026-07-02
CAL189 - 7 2026-07-10
CAL151 - 7 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CAL107 - Jul 14, 01:00 UTCJul 14, 02:15 UTC1h 15m
2026-07-13 CAL106 - Jul 13, 08:35 UTCJul 13, 11:30 UTC2h 55m
2026-07-13 CAL705 TPE → TPE Jul 13, 00:35 UTCJul 13, 07:10 UTC6h 35m
2026-07-12 CAL518 - Jul 12, 14:45 UTCJul 12, 15:25 UTC40m
2026-07-12 CAL518 - Jul 12, 12:35 UTCJul 12, 12:45 UTC10m
2026-07-12 CAL517 - Jul 12, 08:05 UTCJul 12, 08:35 UTC30m
2026-07-12 CAL151 - Jul 12, 01:10 UTCJul 12, 03:35 UTC2h 25m
2026-07-10 CAL150 - Jul 10, 09:30 UTCJul 10, 11:50 UTC2h 20m
2026-07-10 CAL189 PUS → TPE Jul 10, 04:20 UTCJul 10, 06:20 UTC2h 0m
2026-07-10 CAL188 - Jul 10, 01:50 UTCJul 10, 02:15 UTC25m
2026-07-10 CAL188 - Jul 10, 00:25 UTCJul 10, 00:55 UTC30m
2026-07-09 CAL756 - Jul 9, 22:05 UTCJul 9, 22:55 UTC50m
2026-07-09 CAL755 - Jul 9, 16:30 UTCJul 9, 16:55 UTC25m
2026-07-09 CAL755 - Jul 9, 13:00 UTCJul 9, 13:45 UTC45m
2026-07-09 CAL029 - Jul 9, 07:45 UTCJul 9, 11:25 UTC3h 40m
2026-07-09 CAL030 - Jul 9, 02:25 UTCJul 9, 06:05 UTC3h 40m
2026-07-08 CAL838 BKK → TPE Jul 8, 20:00 UTCJul 8, 23:15 UTC3h 15m
2026-07-08 CAL837 - Jul 8, 14:50 UTCJul 8, 18:00 UTC3h 10m
2026-07-08 CAL732 - Jul 8, 11:00 UTCJul 8, 12:00 UTC1h 0m
2026-07-08 CAL731 - Jul 8, 05:50 UTCJul 8, 06:10 UTC20m
2026-07-08 CAL731 - Jul 8, 02:00 UTCJul 8, 02:45 UTC45m
2026-07-07 CAL794 - Jul 7, 12:35 UTCJul 7, 14:10 UTC1h 35m
2026-07-07 CAL794 - Jul 7, 11:35 UTCJul 7, 11:50 UTC15m
2026-07-07 CAL793 - Jul 7, 07:00 UTCJul 7, 09:20 UTC2h 20m
2026-07-07 CAL191 PUS → TPE Jul 7, 01:35 UTCJul 7, 03:25 UTC1h 50m
2026-07-06 CAL190 - Jul 6, 23:55 UTCJul 7, 00:15 UTC20m
2026-07-06 CAL190 - Jul 6, 22:25 UTCJul 6, 22:55 UTC30m
2026-07-06 CAL790 - Jul 6, 12:00 UTCJul 6, 13:10 UTC1h 10m
2026-07-06 CAL789 - Jul 6, 07:10 UTCJul 6, 08:05 UTC55m
2026-07-06 CAL189 PUS → TPE Jul 6, 03:15 UTCJul 6, 05:20 UTC2h 5m
2026-07-06 CAL188 - Jul 6, 01:35 UTCJul 6, 01:55 UTC20m
2026-07-06 CAL188 - Jul 6, 00:05 UTCJul 6, 00:30 UTC25m
2026-07-05 CAL518 - Jul 5, 14:45 UTCJul 5, 15:15 UTC30m
2026-07-05 CAL518 - Jul 5, 12:45 UTCJul 5, 12:55 UTC10m
2026-07-05 CAL517 - Jul 5, 08:00 UTCJul 5, 09:00 UTC1h 0m
2026-07-05 CAL155 - Jul 5, 04:05 UTCJul 5, 06:35 UTC2h 30m
2026-07-05 CAL154 TPE → NGO Jul 5, 00:35 UTCJul 5, 02:10 UTC1h 35m
2026-07-04 CAL154 TPE → NGO Jul 4, 23:50 UTCJul 5, 00:05 UTC15m
2026-07-04 CAL836 BKK → TPE Jul 4, 10:35 UTCJul 4, 14:05 UTC3h 30m
2026-07-04 CAL835 - Jul 4, 05:45 UTCJul 4, 09:00 UTC3h 15m
2026-07-04 CAL107 - Jul 4, 03:40 UTCJul 4, 03:55 UTC15m
2026-07-04 CAL107 - Jul 4, 00:55 UTCJul 4, 03:05 UTC2h 10m
2026-07-03 CAL106 TPE → NRT Jul 3, 09:00 UTCJul 3, 11:50 UTC2h 50m
2026-07-03 CAL157 KIX → TPE Jul 3, 04:40 UTCJul 3, 07:05 UTC2h 25m
2026-07-03 CAL156 TPE → KIX Jul 3, 00:40 UTCJul 3, 02:55 UTC2h 15m
2026-07-02 CAL195 - Jul 2, 11:30 UTCJul 2, 11:55 UTC25m
2026-07-02 CAL194 - Jul 2, 07:00 UTCJul 2, 07:50 UTC50m
2026-07-02 CAL113 HIJ → TPE Jul 2, 03:05 UTCJul 2, 05:25 UTC2h 20m
2026-07-02 CAL112 TPE → HIJ Jul 2, 01:15 UTCJul 2, 01:40 UTC25m
2026-07-01 CAL112 TPE → HIJ Jul 1, 23:35 UTCJul 1, 23:55 UTC20m

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 27m ago.
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, CAL187, CAL155, CAL756.