Apparatus

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sensors Mode-S transponder

8990A1

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18652 · BOEING 737-800

Hex
8990A1
Octal
42310241
Decimal
9,015,457
Country
TW
Tail
B-18652
Type
B738
No current signal · last broadcast Jul 26, 13:05 UTC
Flights observed
313
Distinct callsigns
20
Country
TW
Last broadcast
Jul 26, 13:05 UTC

Last known position

Most recent position reported by Mode-S 8990A1.

Country allocation

The ICAO 24-bit address 8990A1 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
CAL840 - 15 2026-06-16
CAL133 - 15 2026-06-15
CAL915 China Airlines 14 2026-05-23
CAL839 - 14 2026-06-16
CAL132 - 13 2026-06-21
CAL586 - 12 2026-06-21
CAL199 - 12 2026-06-17
CAL139 - 11 2026-06-19
MDA1276 Mandarin Airlines 10 2026-07-26
MDA1275 Mandarin Airlines 10 2026-07-26
CAL585 - 10 2026-06-21
CAL198 - 10 2026-06-16
CAL916 China Airlines 9 2026-05-23
CAL261 China Airlines 9 2026-07-26
CAL260 China Airlines 8 2026-07-26
CAL138 - 8 2026-06-19
CAL167 China Airlines 7 2026-06-10
MDA211 Mandarin Airlines 6 2026-07-23
MDA218 Mandarin Airlines 5 2026-07-25
MDA212 Mandarin Airlines 5 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 MDA1276 KNH → TSA Jul 26, 12:30 UTCJul 26, 13:00 UTC30m
2026-07-26 MDA1275 TSA → KNH Jul 26, 10:20 UTCJul 26, 10:55 UTC35m
2026-07-26 CAL261 GMP → TSA Jul 26, 06:50 UTCJul 26, 07:20 UTC30m
2026-07-26 CAL261 GMP → TSA Jul 26, 05:15 UTCJul 26, 05:55 UTC40m
2026-07-26 CAL260 TSA → GMP Jul 26, 01:35 UTCJul 26, 03:40 UTC2h 5m
2026-07-25 MDA218 WUH → TSA Jul 25, 11:55 UTCJul 25, 12:40 UTC45m
2026-07-25 MDA217 TSA → WUH Jul 25, 05:30 UTCJul 25, 05:45 UTC15m
2026-07-25 MDA1276 KNH → TSA Jul 25, 03:20 UTCJul 25, 03:55 UTC35m
2026-07-25 MDA1275 TSA → KNH Jul 25, 01:00 UTCJul 25, 01:35 UTC35m
2026-07-24 MDA1276 KNH → TSA Jul 24, 11:35 UTCJul 24, 12:05 UTC30m
2026-07-24 MDA1275 TSA → KNH Jul 24, 09:15 UTCJul 24, 09:45 UTC30m
2026-07-24 MDA2070 KNH → TSA Jul 24, 07:40 UTCJul 24, 08:05 UTC25m
2026-07-24 MDA2069 TSA → KNH Jul 24, 05:40 UTCJul 24, 06:10 UTC30m
2026-07-24 MDA212 FOC → TSA Jul 24, 02:45 UTCJul 24, 03:30 UTC45m
2026-07-23 MDA211 TSA → FOC Jul 23, 23:10 UTCJul 24, 00:15 UTC1h 5m
2026-07-23 MDA1276 KNH → TSA Jul 23, 12:30 UTCJul 23, 13:00 UTC30m
2026-07-23 MDA1275 TSA → KNH Jul 23, 10:30 UTCJul 23, 11:00 UTC30m
2026-07-23 CAL261 GMP → TSA Jul 23, 06:55 UTCJul 23, 07:10 UTC15m
2026-07-23 CAL261 GMP → TSA Jul 23, 05:05 UTCJul 23, 05:40 UTC35m
2026-07-23 CAL260 TSA → GMP Jul 23, 01:30 UTCJul 23, 03:35 UTC2h 5m
2026-07-22 MDA218 - Jul 22, 11:10 UTCJul 22, 11:55 UTC45m
2026-07-21 MDA211 TSA → FOC Jul 21, 23:30 UTCJul 22, 03:30 UTC4h 0m
2026-07-21 MDA1276 KNH → TSA Jul 21, 11:15 UTCJul 21, 11:45 UTC30m
2026-07-21 MDA1275 TSA → KNH Jul 21, 09:15 UTCJul 21, 09:50 UTC35m
2026-07-21 MDA2070 KNH → TSA Jul 21, 07:25 UTCJul 21, 07:55 UTC30m
2026-07-21 MDA2069 TSA → KNH Jul 21, 05:20 UTCJul 21, 05:55 UTC35m
2026-07-21 MDA212 FOC → TSA Jul 21, 03:15 UTCJul 21, 03:50 UTC35m
2026-07-20 MDA211 TSA → FOC Jul 20, 23:05 UTCJul 20, 23:15 UTC10m
2026-07-20 MDA1276 - Jul 20, 11:30 UTCJul 20, 12:00 UTC30m
2026-07-20 MDA1275 - Jul 20, 09:15 UTCJul 20, 09:45 UTC30m
2026-07-20 CAL261 GMP → TSA Jul 20, 05:10 UTCJul 20, 07:25 UTC2h 15m
2026-07-20 CAL260 - Jul 20, 02:50 UTCJul 20, 03:25 UTC35m
2026-07-20 CAL260 - Jul 20, 01:20 UTCJul 20, 01:45 UTC25m
2026-07-19 MDA386 MZG → TSA Jul 19, 13:45 UTCJul 19, 14:15 UTC30m
2026-07-19 MDA385 - Jul 19, 12:10 UTCJul 19, 12:45 UTC35m
2026-07-19 MDA376 MZG → TSA Jul 19, 10:40 UTCJul 19, 11:10 UTC30m
2026-07-19 MDA375 TSA → MZG Jul 19, 08:50 UTCJul 19, 09:25 UTC35m
2026-07-19 CAL261 GMP → TSA Jul 19, 05:05 UTCJul 19, 07:10 UTC2h 5m
2026-07-19 CAL260 TSA → GMP Jul 19, 01:25 UTCJul 19, 03:30 UTC2h 5m
2026-07-18 MDA218 - Jul 18, 11:35 UTCJul 18, 11:40 UTC5m
2026-07-18 MDA217 - Jul 18, 05:45 UTCJul 18, 06:05 UTC20m
2026-07-18 MDA1276 - Jul 18, 03:10 UTCJul 18, 03:50 UTC40m
2026-07-18 MDA1275 - Jul 18, 01:05 UTCJul 18, 01:34 UTC30m
2026-07-17 MDA1276 - Jul 17, 11:25 UTCJul 17, 11:55 UTC30m
2026-07-17 MDA1275 - Jul 17, 09:20 UTCJul 17, 09:45 UTC25m
2026-07-17 MDA2070 - Jul 17, 07:25 UTCJul 17, 08:10 UTC45m
2026-07-17 MDA2069 - Jul 17, 05:25 UTCJul 17, 06:00 UTC35m
2026-07-17 MDA212 FOC → TSA Jul 17, 03:10 UTCJul 17, 03:34 UTC25m
2026-07-16 MDA211 TSA → FOC Jul 16, 23:15 UTCJul 16, 23:35 UTC20m
2026-07-16 MDA1276 - Jul 16, 11:25 UTCJul 16, 11:54 UTC30m

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-18652 page for operator, model, and routing details .

Mode-S 8990A1 frequently asked

What is Mode-S code 8990A1?
8990A1 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18652.
Where is Mode-S 8990A1 registered?
Mode-S code 8990A1 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8990A1 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 13:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8990A1, octal 42310241, decimal 9,015,457.
What flights does 8990A1 operate?
Mode-S 8990A1 has broadcast 20 distinct callsigns, including CAL840, CAL133, CAL915, CAL839, CAL132.