Apparatus

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sensors Mode-S transponder

89901A

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18055 · BOEING 777-300ER

Hex
89901A
Octal
42310032
Decimal
9,015,322
Country
TW
Tail
B-18055
Type
B77W
No current signal · last broadcast Jul 26, 19:15 UTC
Flights observed
230
Distinct callsigns
20
Country
TW
Last broadcast
Jul 26, 19:15 UTC

Last known position

Most recent position reported by Mode-S 89901A.

Country allocation

The ICAO 24-bit address 89901A 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
CAL007 - 44 2026-07-21
CAL008 - 41 2026-07-20
CAL722 - 26 2026-07-07
CAL721 - 25 2026-07-07
CAL784 China Airlines 10 2026-07-20
CAL004 - 9 2026-07-26
CAL772 - 8 2026-07-18
CAL031 - 8 2026-07-16
CAL783 China Airlines 7 2026-07-20
CAL032 - 7 2026-07-15
CAL003 - 7 2026-07-19
CAL771 - 6 2026-07-10
CAL104 - 4 2026-06-30
CAL024 China Airlines 4 2026-07-24
CAL023 China Airlines 4 2026-07-25
CAL105 - 3 2026-06-30
CAL832 China Airlines 2 2026-07-26
CAL831 China Airlines 2 2026-07-26
CAL504 - 2 2026-07-15
CAL501 - 2 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CAL004 - Jul 26, 16:15 UTCJul 26, 19:15 UTC3h 0m
2026-07-26 CAL832 BKK → TPE Jul 26, 06:45 UTCJul 26, 10:05 UTC3h 20m
2026-07-26 CAL831 TPE → BKK Jul 26, 01:50 UTCJul 26, 04:50 UTC3h 0m
2026-07-25 CAL023 ONT → TPE Jul 25, 20:15 UTCJul 25, 20:30 UTC15m
2026-07-25 CAL023 ONT → TPE Jul 25, 07:50 UTCJul 25, 19:00 UTC11h 10m
2026-07-24 CAL024 TPE → ONT Jul 24, 15:40 UTCJul 25, 02:20 UTC10h 40m
2026-07-24 CAL024 TPE → ONT Jul 24, 14:10 UTCJul 24, 14:20 UTC10m
2026-07-24 CAL832 BKK → TPE Jul 24, 06:55 UTCJul 24, 10:20 UTC3h 25m
2026-07-24 CAL831 TPE → BKK Jul 24, 02:00 UTCJul 24, 05:10 UTC3h 10m
2026-07-23 CAL023 ONT → TPE Jul 23, 20:15 UTCJul 23, 20:35 UTC20m
2026-07-23 CAL023 ONT → TPE Jul 23, 07:50 UTCJul 23, 18:55 UTC11h 5m
2026-07-22 CAL024 TPE → ONT Jul 22, 15:30 UTCJul 23, 02:25 UTC10h 55m
2026-07-22 CAL024 TPE → ONT Jul 22, 13:40 UTCJul 22, 13:55 UTC15m
2026-07-22 CAL100 TPE → NRT Jul 22, 01:30 UTCJul 22, 04:25 UTC2h 55m
2026-07-21 CAL007 - Jul 21, 20:40 UTCJul 21, 21:00 UTC20m
2026-07-21 CAL007 - Jul 21, 08:25 UTCJul 21, 19:30 UTC11h 5m
2026-07-20 CAL008 - Jul 20, 16:20 UTCJul 21, 04:40 UTC12h 19m
2026-07-20 CAL784 SGN → TPE Jul 20, 12:50 UTCJul 20, 14:05 UTC1h 15m
2026-07-20 CAL783 TPE → SGN Jul 20, 06:05 UTCJul 20, 06:55 UTC50m
2026-07-19 CAL003 - Jul 19, 19:55 UTCJul 19, 20:20 UTC25m
2026-07-19 CAL003 - Jul 19, 08:15 UTCJul 19, 18:45 UTC10h 30m
2026-07-18 CAL004 - Jul 18, 17:50 UTCJul 19, 03:45 UTC9h 55m
2026-07-18 CAL004 - Jul 18, 16:15 UTCJul 18, 16:25 UTC10m
2026-07-18 CAL772 - Jul 18, 02:00 UTCJul 18, 13:15 UTC11h 16m
2026-07-17 CAL784 TPE → TPE Jul 17, 06:05 UTCJul 17, 14:35 UTC8h 30m
2026-07-16 CAL031 - Jul 16, 20:00 UTCJul 16, 20:15 UTC15m
2026-07-16 CAL031 - Jul 16, 09:10 UTCJul 16, 18:50 UTC9h 40m
2026-07-15 CAL032 - Jul 15, 16:20 UTCJul 16, 03:10 UTC10h 50m
2026-07-15 CAL504 - Jul 15, 13:10 UTCJul 15, 13:35 UTC25m
2026-07-15 CAL503 - Jul 15, 08:50 UTCJul 15, 09:00 UTC10m
2026-07-15 CAL502 - Jul 15, 05:50 UTCJul 15, 06:10 UTC20m
2026-07-15 CAL501 - Jul 15, 01:05 UTCJul 15, 01:15 UTC10m
2026-07-14 CAL003 - Jul 14, 19:55 UTCJul 14, 20:20 UTC25m
2026-07-14 CAL003 - Jul 14, 08:15 UTCJul 14, 18:50 UTC10h 35m
2026-07-13 CAL004 TPE → SFO Jul 13, 16:15 UTCJul 14, 03:55 UTC11h 40m
2026-07-13 CAL501 TPE → TPE Jul 13, 01:05 UTCJul 13, 05:55 UTC4h 50m
2026-07-11 CAL772D - Jul 11, 17:35 UTCJul 11, 20:55 UTC3h 20m
2026-07-10 CAL771 - Jul 10, 01:35 UTCJul 10, 04:45 UTC3h 10m
2026-07-09 CAL031 - Jul 9, 09:00 UTCJul 9, 20:25 UTC11h 25m
2026-07-08 CAL032 TPE → YVR Jul 8, 15:55 UTCJul 9, 02:05 UTC10h 10m
2026-07-08 CAL784 TPE → TPE Jul 8, 05:55 UTCJul 8, 13:40 UTC7h 45m
2026-07-08 CAL121 - Jul 8, 03:10 UTCJul 8, 04:10 UTC1h 0m
2026-07-08 CAL120 - Jul 8, 00:25 UTCJul 8, 00:45 UTC20m
2026-07-07 CAL722 - Jul 7, 07:20 UTCJul 7, 11:40 UTC4h 20m
2026-07-07 CAL721 - Jul 7, 01:15 UTCJul 7, 05:25 UTC4h 10m
2026-07-06 CAL722 - Jul 6, 09:05 UTCJul 6, 13:20 UTC4h 15m
2026-07-06 CAL721 - Jul 6, 03:05 UTCJul 6, 07:10 UTC4h 5m
2026-07-05 CAL007 - Jul 5, 08:05 UTCJul 5, 21:15 UTC13h 10m
2026-07-04 CAL008 - Jul 4, 18:15 UTCJul 5, 04:15 UTC10h 0m
2026-07-04 CAL008 - Jul 4, 16:25 UTCJul 4, 16:40 UTC15m

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-18055 page for operator, model, and routing details .

Mode-S 89901A frequently asked

What is Mode-S code 89901A?
89901A is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18055.
Where is Mode-S 89901A registered?
Mode-S code 89901A is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 89901A broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 89901A, octal 42310032, decimal 9,015,322.
What flights does 89901A operate?
Mode-S 89901A has broadcast 20 distinct callsigns, including CAL007, CAL008, CAL722, CAL721, CAL784.