Apparatus

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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 Jul 26, 20:50 UTC
Flights observed
398
Distinct callsigns
20
Country
TW
Last broadcast
Jul 26, 20:50 UTC

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 China Airlines 14 2026-07-25
CAL794 - 11 2026-07-23
CAL851 - 10 2026-07-09
CAL793 China Airlines 10 2026-07-23
CAL129 China Airlines 10 2026-07-26
CAL923 China Airlines 9 2026-07-24
CAL189 China Airlines 9 2026-07-26
CAL128 China Airlines 9 2026-07-26
CAL108 China Airlines 9 2026-07-25
CAL910 - 8 2026-07-14
CAL852 - 8 2026-07-09
CAL731 China Airlines 8 2026-07-22
CAL151 China Airlines 8 2026-06-10
CAL131 China Airlines 8 2026-07-21
CAL113 - 8 2026-07-12
CAL924 China Airlines 7 2026-07-24
CAL909 - 7 2026-07-14
CAL756 China Airlines 7 2026-07-07
CAL601 China Airlines 7 2026-07-24
CAL150 China Airlines 7 2026-06-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CAL838 BKK → TPE Jul 26, 20:20 UTCJul 26, 20:50 UTC30m
2026-07-26 CAL837 TPE → BKK Jul 26, 14:45 UTCJul 26, 18:05 UTC3h 20m
2026-07-26 CAL129 FUK → TPE Jul 26, 10:40 UTCJul 26, 12:25 UTC1h 45m
2026-07-26 CAL128 TPE → FUK Jul 26, 08:30 UTCJul 26, 08:55 UTC25m
2026-07-26 CAL128 TPE → FUK Jul 26, 07:10 UTCJul 26, 07:35 UTC25m
2026-07-26 CAL189 PUS → TPE Jul 26, 03:20 UTCJul 26, 05:15 UTC1h 55m
2026-07-26 CAL188 TPE → PUS Jul 26, 00:20 UTCJul 26, 02:10 UTC1h 50m
2026-07-25 CAL109 NRT → TPE Jul 25, 14:15 UTCJul 25, 14:30 UTC15m
2026-07-25 CAL109 NRT → TPE Jul 25, 11:35 UTCJul 25, 13:40 UTC2h 5m
2026-07-25 CAL108 TPE → NRT Jul 25, 08:25 UTCJul 25, 09:45 UTC1h 20m
2026-07-25 CAL108 TPE → NRT Jul 25, 06:45 UTCJul 25, 07:05 UTC20m
2026-07-25 CAL602 HKG → TPE Jul 25, 03:25 UTCJul 25, 04:50 UTC1h 25m
2026-07-24 CAL601 TPE → HKG Jul 24, 23:40 UTCJul 25, 00:55 UTC1h 15m
2026-07-24 CAL924 HKG → TPE Jul 24, 16:15 UTCJul 24, 17:35 UTC1h 20m
2026-07-24 CAL923 TPE → HKG Jul 24, 10:35 UTCJul 24, 11:50 UTC1h 15m
2026-07-24 CAL157 KIX → TPE Jul 24, 07:10 UTCJul 24, 07:35 UTC25m
2026-07-24 CAL157 KIX → TPE Jul 24, 05:05 UTCJul 24, 06:40 UTC1h 35m
2026-07-24 CAL156 TPE → KIX Jul 24, 02:50 UTCJul 24, 03:40 UTC50m
2026-07-24 CAL156 TPE → KIX Jul 24, 01:15 UTCJul 24, 01:30 UTC15m
2026-07-23 CAL794 - Jul 23, 11:40 UTCJul 23, 13:55 UTC2h 15m
2026-07-23 CAL793 TPE → HAN Jul 23, 06:55 UTCJul 23, 09:15 UTC2h 20m
2026-07-22 CAL731 TPE → PEN Jul 22, 01:50 UTCJul 22, 12:05 UTC10h 15m
2026-07-21 CAL131 CTS → TPE Jul 21, 10:30 UTCJul 21, 10:45 UTC15m
2026-07-21 CAL131 CTS → TPE Jul 21, 07:10 UTCJul 21, 09:10 UTC2h 0m
2026-07-21 CAL130 TPE → CTS Jul 21, 01:40 UTCJul 21, 04:25 UTC2h 45m
2026-07-21 CAL130 TPE → CTS Jul 21, 00:50 UTCJul 21, 01:05 UTC15m
2026-07-20 CAL794 - Jul 20, 11:20 UTCJul 20, 13:45 UTC2h 25m
2026-07-20 CAL793 TPE → HAN Jul 20, 06:50 UTCJul 20, 08:05 UTC1h 15m
2026-07-20 CAL107 NRT → TPE Jul 20, 03:35 UTCJul 20, 04:00 UTC25m
2026-07-20 CAL107 NRT → TPE Jul 20, 01:05 UTCJul 20, 02:25 UTC1h 20m
2026-07-19 CAL106 TPE → NRT Jul 19, 08:40 UTCJul 19, 11:40 UTC3h 0m
2026-07-19 CAL705 TPE → TPE Jul 19, 00:50 UTCJul 19, 06:45 UTC5h 55m
2026-07-18 CAL920 HKG → TPE Jul 18, 12:25 UTCJul 18, 13:55 UTC1h 30m
2026-07-18 CAL919 - Jul 18, 09:05 UTCJul 18, 10:20 UTC1h 15m
2026-07-18 CAL705 TPE → TPE Jul 18, 00:45 UTCJul 18, 06:45 UTC6h 1m
2026-07-17 CAL131 - Jul 17, 09:55 UTCJul 17, 10:30 UTC35m
2026-07-17 CAL131 - Jul 17, 06:45 UTCJul 17, 08:59 UTC2h 15m
2026-07-17 CAL130 TPE → CTS Jul 17, 00:55 UTCJul 17, 04:29 UTC3h 35m
2026-07-16 CAL029 - Jul 16, 10:20 UTCJul 16, 10:45 UTC25m
2026-07-16 CAL029 - Jul 16, 07:20 UTCJul 16, 07:50 UTC30m
2026-07-16 CAL030 - Jul 16, 05:20 UTCJul 16, 06:05 UTC45m
2026-07-16 CAL030 - Jul 16, 02:35 UTCJul 16, 02:45 UTC10m
2026-07-15 CAL187 - Jul 15, 12:50 UTCJul 15, 13:10 UTC20m
2026-07-15 CAL187 - Jul 15, 11:20 UTCJul 15, 11:40 UTC20m
2026-07-15 CAL186 - Jul 15, 09:30 UTCJul 15, 09:50 UTC20m
2026-07-15 CAL186 - Jul 15, 07:55 UTCJul 15, 08:20 UTC25m
2026-07-14 CAL788 - Jul 14, 23:40 UTCJul 15, 06:00 UTC6h 20m
2026-07-14 CAL924 HKG → TPE Jul 14, 13:35 UTCJul 14, 15:05 UTC1h 30m
2026-07-14 CAL923 - Jul 14, 10:35 UTCJul 14, 11:55 UTC1h 20m
2026-07-14 CAL910 HKG → TPE Jul 14, 06:50 UTCJul 14, 08:20 UTC1h 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-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 Jul 26, 20:50 UTC.
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, CAL794, CAL851, CAL793, CAL129.