Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

8990A2

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18653 · BOEING 737-800

Hex
8990A2
Octal
42310242
Decimal
9,015,458
Country
TW
Tail
B-18653
Type
B738
No current signal · last broadcast 52m ago
Flights observed
198
Distinct callsigns
19
Country
TW
Last broadcast
52m ago

Last known position

Most recent position reported by Mode-S 8990A2.

Country allocation

The ICAO 24-bit address 8990A2 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 19 distinct

Callsign Airline Flights Last seen
CAL839 China Airlines 29 2026-05-29
CAL840 China Airlines 28 2026-05-29
CAL757 China Airlines 26 2026-05-26
MDA983 Mandarin Airlines 23 2026-05-29
CAL712 China Airlines 22 2026-05-26
CAL711 China Airlines 20 2026-05-25
MDA984 Mandarin Airlines 19 2026-05-25
CAL758 China Airlines 19 2026-05-26
MDA303 Mandarin Airlines 2 2026-05-24
MDA354 Mandarin Airlines 1 2026-05-15
MDA353 Mandarin Airlines 1 2026-05-15
MDA346 Mandarin Airlines 1 2026-05-10
MDA345 Mandarin Airlines 1 2026-05-10
MDA332 Mandarin Airlines 1 2026-05-15
MDA331 Mandarin Airlines 1 2026-05-14
MDA308 Mandarin Airlines 1 2026-05-10
MDA307 Mandarin Airlines 1 2026-05-10
CAL7897 - 1 2026-05-29
CAL7842 China Airlines 1 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 MDA983 KHH → HKG May 29, 23:50 UTCMay 30, 00:30 UTC40m
2026-05-29 CAL840 BKK → KHH May 29, 11:50 UTCMay 29, 14:45 UTC2h 55m
2026-05-29 CAL839 KHH → BKK May 29, 07:15 UTCMay 29, 10:20 UTC3h 5m
2026-05-29 CAL7897 TPE → KHH May 29, 04:50 UTCMay 29, 05:45 UTC55m
2026-05-26 CAL7842 KHH → TPE May 26, 23:54 UTCMay 27, 00:34 UTC40m
2026-05-26 CAL758 SIN → KHH May 26, 13:50 UTCMay 26, 14:40 UTC50m
2026-05-26 CAL757 KHH → SIN May 26, 05:15 UTCMay 26, 08:45 UTC3h 30m
2026-05-26 CAL712 MNL → KHH May 26, 02:15 UTCMay 26, 03:35 UTC1h 20m
2026-05-25 CAL711 KHH → MNL May 25, 23:30 UTCMay 26, 00:49 UTC1h 20m
2026-05-25 CAL840 BKK → KHH May 25, 11:35 UTCMay 25, 14:40 UTC3h 5m
2026-05-25 CAL839 KHH → BKK May 25, 06:50 UTCMay 25, 09:50 UTC3h 0m
2026-05-25 MDA984 HKG → KHH May 25, 02:35 UTCMay 25, 03:45 UTC1h 10m
2026-05-24 MDA983 KHH → HKG May 24, 23:30 UTCMay 24, 23:46 UTC16m
2026-05-24 CAL840 BKK → KHH May 24, 11:45 UTCMay 24, 14:55 UTC3h 10m
2026-05-24 CAL839 KHH → BKK May 24, 07:20 UTCMay 24, 10:20 UTC3h 0m
2026-05-24 MDA303 KHH → KNH May 24, 04:45 UTCMay 24, 05:10 UTC25m
2026-05-24 MDA303 KHH → KNH May 24, 03:00 UTCMay 24, 03:20 UTC20m
2026-05-23 CAL758 SIN → KHH May 23, 13:50 UTCMay 23, 14:40 UTC50m
2026-05-23 CAL757 KHH → SIN May 23, 05:20 UTCMay 23, 09:05 UTC3h 45m
2026-05-23 MDA984 HKG → KHH May 23, 02:15 UTCMay 23, 03:25 UTC1h 9m
2026-05-23 MDA983 KHH → HKG May 23, 00:35 UTCMay 23, 00:45 UTC10m
2026-05-22 MDA983 KHH → HKG May 22, 23:40 UTCMay 23, 00:00 UTC20m
2026-05-22 CAL840 BKK → KHH May 22, 11:40 UTCMay 22, 14:40 UTC3h 0m
2026-05-22 CAL839 KHH → BKK May 22, 06:55 UTCMay 22, 10:00 UTC3h 5m
2026-05-22 CAL712 MNL → KHH May 22, 02:30 UTCMay 22, 03:50 UTC1h 20m
2026-05-21 CAL711 KHH → MNL May 21, 23:50 UTCMay 22, 01:25 UTC1h 35m
2026-05-21 CAL758 SIN → KHH May 21, 13:45 UTCMay 21, 14:35 UTC50m
2026-05-21 CAL757 KHH → SIN May 21, 05:15 UTCMay 21, 05:35 UTC20m
2026-05-21 MDA984 HKG → KHH May 21, 02:45 UTCMay 21, 03:50 UTC1h 5m
2026-05-21 MDA983 KHH → HKG May 21, 00:35 UTCMay 21, 00:55 UTC20m
2026-05-20 MDA983 KHH → HKG May 20, 23:45 UTCMay 21, 00:00 UTC15m
2026-05-20 CAL840 BKK → KHH May 20, 11:30 UTCMay 20, 14:35 UTC3h 5m
2026-05-20 CAL839 KHH → BKK May 20, 06:45 UTCMay 20, 09:50 UTC3h 5m
2026-05-20 CAL712 MNL → KHH May 20, 02:40 UTCMay 20, 04:00 UTC1h 20m
2026-05-19 CAL711 KHH → MNL May 19, 23:35 UTCMay 20, 01:10 UTC1h 35m
2026-05-19 CAL758 SIN → KHH May 19, 13:50 UTCMay 19, 14:30 UTC40m
2026-05-19 CAL757 KHH → SIN May 19, 05:10 UTCMay 19, 08:35 UTC3h 25m
2026-05-18 CAL840 BKK → KHH May 18, 11:30 UTCMay 18, 14:30 UTC3h 0m
2026-05-18 CAL839 KHH → BKK May 18, 06:45 UTCMay 18, 09:50 UTC3h 5m
2026-05-18 MDA984 HKG → KHH May 18, 02:20 UTCMay 18, 03:30 UTC1h 10m
2026-05-17 MDA983 KHH → HKG May 17, 23:25 UTCMay 18, 00:35 UTC1h 10m
2026-05-17 CAL840 BKK → KHH May 17, 11:45 UTCMay 17, 14:40 UTC2h 55m
2026-05-17 CAL839 KHH → BKK May 17, 06:50 UTCMay 17, 10:05 UTC3h 15m
2026-05-17 CAL712 MNL → KHH May 17, 02:05 UTCMay 17, 03:25 UTC1h 20m
2026-05-16 CAL711 KHH → MNL May 16, 23:30 UTCMay 17, 00:50 UTC1h 20m
2026-05-16 CAL758 SIN → KHH May 16, 13:46 UTCMay 16, 14:35 UTC50m
2026-05-16 CAL757 KHH → SIN May 16, 05:15 UTCMay 16, 08:46 UTC3h 31m
2026-05-16 MDA984 HKG → KHH May 16, 02:25 UTCMay 16, 03:30 UTC1h 5m
2026-05-15 MDA983 KHH → HKG May 15, 23:45 UTCMay 16, 00:55 UTC1h 10m
2026-05-15 CAL840 BKK → KHH May 15, 11:40 UTCMay 15, 14:45 UTC3h 5m

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-18653 page for operator, model, and routing details .

Mode-S 8990A2 frequently asked

What is Mode-S code 8990A2?
8990A2 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18653.
Where is Mode-S 8990A2 registered?
Mode-S code 8990A2 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8990A2 broadcasting right now?
No active broadcast right now. Last signal was 52m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8990A2, octal 42310242, decimal 9,015,458.
What flights does 8990A2 operate?
Mode-S 8990A2 has broadcast 19 distinct callsigns, including CAL839, CAL840, CAL757, MDA983, CAL712.