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
Broadcasting now · callsign CAL721 · 14,400 ft
Flights observed
109
Distinct callsigns
12
Country
TW
Last broadcast
13h ago

Current position

89901A is currently broadcasting. Map zoomed to live position.

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 12 distinct

Callsign Airline Flights Last seen
CAL007 - 31 2026-05-28
CAL008 - 24 2026-05-27
CAL722 China Airlines 15 2026-05-29
CAL721 China Airlines 14 2026-05-29
CAL784 China Airlines 6 2026-05-25
CAL772 China Airlines 5 2026-05-13
CAL783 China Airlines 4 2026-05-27
CAL771 China Airlines 4 2026-05-20
CAL104 China Airlines 3 2026-04-18
CAL105 China Airlines 1 2026-04-18
CAL062 China Airlines 1 2026-04-23
CAL061 China Airlines 1 2026-04-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 CAL722 KUL → TPE May 29, 07:15 UTCMay 29, 11:35 UTC4h 20m
2026-05-29 CAL721 TPE → KUL May 29, 01:10 UTCMay 29, 05:25 UTC4h 15m
2026-05-28 CAL007 - May 28, 07:40 UTCMay 28, 21:05 UTC13h 25m
2026-05-27 CAL008 - May 27, 18:20 UTCMay 28, 04:00 UTC9h 40m
2026-05-27 CAL008 - May 27, 16:15 UTCMay 27, 16:35 UTC20m
2026-05-27 CAL783 TPE → SGN May 27, 05:55 UTCMay 27, 13:55 UTC8h 1m
2026-05-26 CAL007 - May 26, 07:24 UTCMay 26, 21:00 UTC13h 35m
2026-05-25 CAL008 - May 25, 16:25 UTCMay 26, 04:00 UTC11h 35m
2026-05-25 CAL784 SGN → TPE May 25, 06:00 UTCMay 25, 14:20 UTC8h 20m
2026-05-24 CAL007 - May 24, 07:30 UTCMay 24, 20:50 UTC13h 20m
2026-05-23 CAL008 - May 23, 16:15 UTCMay 24, 03:45 UTC11h 30m
2026-05-23 CAL722 KUL → TPE May 23, 07:55 UTCMay 23, 12:15 UTC4h 20m
2026-05-23 CAL721 TPE → KUL May 23, 01:10 UTCMay 23, 05:15 UTC4h 5m
2026-05-22 CAL722 KUL → TPE May 22, 07:10 UTCMay 22, 11:40 UTC4h 30m
2026-05-22 CAL721 TPE → KUL May 22, 01:05 UTCMay 22, 05:05 UTC4h 0m
2026-05-21 CAL007 - May 21, 20:40 UTCMay 21, 21:00 UTC20m
2026-05-21 CAL007 - May 21, 07:45 UTCMay 21, 08:40 UTC55m
2026-05-20 CAL008 - May 20, 16:20 UTCMay 21, 03:40 UTC11h 20m
2026-05-20 CAL771 TPE → DPS May 20, 02:05 UTCMay 20, 13:05 UTC11h 1m
2026-05-19 CAL007 - May 19, 20:55 UTCMay 19, 21:10 UTC15m
2026-05-19 CAL007 - May 19, 07:40 UTCMay 19, 20:20 UTC12h 40m
2026-05-18 CAL008 - May 18, 16:15 UTCMay 19, 03:45 UTC11h 29m
2026-05-18 CAL784 SGN → TPE May 18, 06:20 UTCMay 18, 13:50 UTC7h 30m
2026-05-17 CAL007 - May 17, 07:25 UTCMay 17, 20:30 UTC13h 5m
2026-05-16 CAL008 - May 16, 16:20 UTCMay 17, 03:45 UTC11h 25m
2026-05-16 CAL722 KUL → TPE May 16, 07:05 UTCMay 16, 11:16 UTC4h 10m
2026-05-16 CAL721 TPE → KUL May 16, 01:30 UTCMay 16, 05:25 UTC3h 55m
2026-05-15 CAL722 KUL → TPE May 15, 07:20 UTCMay 15, 11:40 UTC4h 20m
2026-05-15 CAL721 TPE → KUL May 15, 01:15 UTCMay 15, 05:20 UTC4h 5m
2026-05-13 CAL772 DPS → TPE May 13, 01:40 UTCMay 13, 12:45 UTC11h 5m
2026-05-12 CAL007 LAX → TPE May 12, 07:25 UTCMay 12, 20:35 UTC13h 10m
2026-05-12 CAL008 - May 12, 02:45 UTCMay 12, 03:10 UTC25m
2026-05-11 CAL008 - May 11, 16:05 UTCMay 11, 18:05 UTC2h 1m
2026-05-11 CAL783 TPE → SGN May 11, 06:20 UTCMay 11, 13:45 UTC7h 25m
2026-05-10 CAL007 - May 10, 07:30 UTCMay 10, 20:54 UTC13h 25m
2026-05-09 CAL008 - May 9, 16:20 UTCMay 10, 03:14 UTC10h 55m
2026-05-09 CAL722 KUL → TPE May 9, 08:00 UTCMay 9, 12:20 UTC4h 20m
2026-05-09 CAL721 TPE → KUL May 9, 01:50 UTCMay 9, 05:55 UTC4h 5m
2026-05-08 CAL722 KUL → TPE May 8, 07:14 UTCMay 8, 11:34 UTC4h 20m
2026-05-08 CAL721 TPE → KUL May 8, 01:09 UTCMay 8, 05:20 UTC4h 10m
2026-05-07 CAL007 - May 7, 20:20 UTCMay 7, 20:40 UTC20m
2026-05-07 CAL007 - May 7, 07:25 UTCMay 7, 18:50 UTC11h 25m
2026-05-06 CAL008 - May 6, 16:10 UTCMay 7, 04:05 UTC11h 54m
2026-05-06 CAL772 DPS → TPE May 6, 01:40 UTCMay 6, 12:40 UTC11h 0m
2026-05-05 CAL007 - May 5, 07:20 UTCMay 5, 21:01 UTC13h 40m
2026-05-04 CAL008 - May 4, 16:15 UTCMay 5, 03:30 UTC11h 16m
2026-05-04 CAL784 SGN → TPE May 4, 06:05 UTCMay 4, 13:50 UTC7h 45m
2026-05-03 CAL007 - May 3, 21:05 UTCMay 3, 21:35 UTC30m
2026-05-03 CAL007 - May 3, 07:50 UTCMay 3, 20:35 UTC12h 45m
2026-05-02 CAL008 - May 2, 16:20 UTCMay 3, 04:10 UTC11h 49m

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?
Yes. Mode-S 89901A is currently airborne.
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 12 distinct callsigns, including CAL007, CAL008, CAL722, CAL721, CAL784.