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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 CAL004 · 13,175 ft
Flights observed
196
Distinct callsigns
20
Country
TW
Last broadcast
8h 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 20 distinct

Callsign Airline Flights Last seen
CAL007 - 42 2026-07-05
CAL008 - 40 2026-07-04
CAL722 - 26 2026-07-07
CAL721 - 25 2026-07-07
CAL784 - 8 2026-07-08
CAL772 - 7 2026-07-04
CAL783 - 6 2026-06-26
CAL771 - 6 2026-07-10
CAL032 - 6 2026-07-08
CAL031 - 6 2026-07-09
CAL004 - 6 2026-07-13
CAL104 - 4 2026-06-30
CAL105 - 3 2026-06-30
CAL003 - 3 2026-07-01
CAL781 - 1 2026-06-21
CAL772D - 1 2026-07-11
CAL504 - 1 2026-06-24
CAL501 - 1 2026-07-13
CAL121 - 1 2026-07-08
CAL120 - 1 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CAL004 - Jul 13, 16:15 UTCJul 13, 19:15 UTC3h 0m
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
2026-07-04 CAL772 TPE → TPE Jul 4, 02:05 UTCJul 4, 13:15 UTC11h 10m
2026-07-03 CAL031 YVR → TPE Jul 3, 21:20 UTCJul 3, 21:40 UTC20m
2026-07-03 CAL031 YVR → TPE Jul 3, 09:20 UTCJul 3, 19:55 UTC10h 35m
2026-07-02 CAL032 TPE → YVR Jul 2, 16:30 UTCJul 3, 02:25 UTC9h 55m
2026-07-01 CAL003 - Jul 1, 08:20 UTCJul 1, 20:45 UTC12h 25m
2026-06-30 CAL004 - Jun 30, 18:15 UTCJul 1, 03:15 UTC9h 0m
2026-06-30 CAL004 - Jun 30, 16:25 UTCJun 30, 16:35 UTC10m
2026-06-30 CAL105 - Jun 30, 12:00 UTCJun 30, 12:30 UTC30m
2026-06-30 CAL105 - Jun 30, 09:25 UTCJun 30, 10:40 UTC1h 15m
2026-06-30 CAL104 - Jun 30, 04:35 UTCJun 30, 07:15 UTC2h 40m
2026-06-29 CAL003 - Jun 29, 08:29 UTCJun 29, 21:05 UTC12h 35m
2026-06-28 CAL004 - Jun 28, 17:44 UTCJun 29, 03:05 UTC9h 20m
2026-06-28 CAL004 - Jun 28, 16:19 UTCJun 28, 16:29 UTC10m
2026-06-28 CAL784 - Jun 28, 06:10 UTCJun 28, 13:55 UTC7h 45m
2026-06-27 CAL007 - Jun 27, 07:34 UTCJun 27, 20:59 UTC13h 25m
2026-06-26 CAL008 - Jun 26, 18:09 UTCJun 27, 03:55 UTC9h 45m
2026-06-26 CAL008 - Jun 26, 16:44 UTCJun 26, 17:00 UTC15m
2026-06-26 CAL783 - Jun 26, 06:25 UTCJun 26, 14:44 UTC8h 20m
2026-06-25 CAL031 YVR → TPE Jun 25, 09:10 UTCJun 25, 20:39 UTC11h 30m
2026-06-24 CAL032 TPE → YVR Jun 24, 18:15 UTCJun 25, 02:10 UTC7h 55m
2026-06-24 CAL032 TPE → YVR Jun 24, 16:19 UTCJun 24, 16:29 UTC10m
2026-06-24 CAL504 - Jun 24, 09:15 UTCJun 24, 13:50 UTC4h 35m
2026-06-23 CAL722 - Jun 23, 07:35 UTCJun 23, 11:54 UTC4h 20m
2026-06-23 CAL721 - Jun 23, 01:40 UTCJun 23, 05:39 UTC4h 0m
2026-06-21 CAL781 TPE → TPE Jun 21, 23:30 UTCJun 22, 07:04 UTC7h 35m
2026-06-21 CAL031 YVR → TPE Jun 21, 20:09 UTCJun 21, 20:34 UTC25m
2026-06-21 CAL031 YVR → TPE Jun 21, 09:15 UTCJun 21, 18:50 UTC9h 35m
2026-06-20 CAL032 TPE → YVR Jun 20, 17:59 UTCJun 21, 02:35 UTC8h 35m
2026-06-20 CAL032 TPE → YVR Jun 20, 16:00 UTCJun 20, 16:14 UTC15m
2026-06-20 CAL722 - Jun 20, 07:09 UTCJun 20, 11:34 UTC4h 25m
2026-06-20 CAL721 - Jun 20, 01:24 UTCJun 20, 05:29 UTC4h 5m
2026-06-19 CAL003 - Jun 19, 08:40 UTCJun 19, 18:59 UTC10h 20m
2026-06-18 CAL004 TPE → SFO Jun 18, 16:55 UTCJun 19, 04:10 UTC11h 14m
2026-06-15 CAL722 - Jun 15, 07:05 UTCJun 15, 11:24 UTC4h 20m

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 20 distinct callsigns, including CAL007, CAL008, CAL722, CAL721, CAL784.