Apparatus

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sensors Mode-S transponder

899021

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18051 · BOEING 777-300ER

Hex
899021
Octal
42310041
Decimal
9,015,329
Country
TW
Tail
B-18051
Type
B77W
No current signal · last broadcast 3h ago
Flights observed
210
Distinct callsigns
20
Country
TW
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 899021.

Country allocation

The ICAO 24-bit address 899021 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
CAL012 China Airlines 19 2026-06-07
CAL003 - 19 2026-07-11
CAL004 - 18 2026-07-09
CAL032 - 17 2026-07-13
CAL031 - 17 2026-07-14
CAL011 China Airlines 16 2026-06-08
CAL008 - 10 2026-06-03
CAL781 China Airlines 9 2026-05-30
CAL157 - 7 2026-06-27
CAL024 China Airlines 7 2026-05-29
CAL023 China Airlines 7 2026-05-30
CAL007 - 6 2026-06-03
CAL784 - 5 2026-07-09
CAL772 China Airlines 5 2026-06-02
CAL101 China Airlines 5 2026-06-12
CAL831 China Airlines 3 2026-04-15
CAL156 - 3 2026-06-27
CAL105 - 3 2026-06-25
CAL832 China Airlines 2 2026-04-15
CAL783 China Airlines 2 2026-06-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CAL031 - Jul 14, 09:20 UTCJul 14, 09:50 UTC30m
2026-07-13 CAL032 TPE → YVR Jul 13, 16:15 UTCJul 14, 03:10 UTC10h 55m
2026-07-13 CAL503 - Jul 13, 09:10 UTCJul 13, 13:50 UTC4h 40m
2026-07-12 CAL722 - Jul 12, 07:25 UTCJul 12, 11:30 UTC4h 5m
2026-07-12 CAL721 - Jul 12, 01:30 UTCJul 12, 05:30 UTC4h 0m
2026-07-11 CAL003 - Jul 11, 20:20 UTCJul 11, 20:40 UTC20m
2026-07-11 CAL003 - Jul 11, 08:25 UTCJul 11, 19:00 UTC10h 35m
2026-07-09 CAL004 - Jul 9, 17:05 UTCJul 10, 04:25 UTC11h 20m
2026-07-09 CAL784 - Jul 9, 06:10 UTCJul 9, 14:15 UTC8h 5m
2026-07-08 CAL031 YVR → TPE Jul 8, 08:55 UTCJul 8, 20:25 UTC11h 30m
2026-07-07 CAL032 TPE → YVR Jul 7, 17:45 UTCJul 8, 02:30 UTC8h 45m
2026-07-07 CAL032 TPE → YVR Jul 7, 16:15 UTCJul 7, 16:30 UTC15m
2026-07-07 CAL784 TPE → TPE Jul 7, 05:55 UTCJul 7, 13:55 UTC8h 0m
2026-07-06 CAL003 - Jul 6, 20:25 UTCJul 6, 20:50 UTC25m
2026-07-06 CAL003 - Jul 6, 08:30 UTCJul 6, 19:15 UTC10h 45m
2026-07-05 CAL004 TPE → SFO Jul 5, 15:55 UTCJul 6, 03:00 UTC11h 5m
2026-07-05 CAL163 - Jul 5, 11:50 UTCJul 5, 13:50 UTC2h 0m
2026-07-05 CAL162 TPE → ICN Jul 5, 07:55 UTCJul 5, 10:00 UTC2h 5m
2026-07-05 CAL161 ICN → TPE Jul 5, 04:15 UTCJul 5, 06:15 UTC2h 0m
2026-07-05 CAL160 TPE → ICN Jul 5, 00:40 UTCJul 5, 02:45 UTC2h 5m
2026-07-03 CAL003 - Jul 3, 20:30 UTCJul 3, 20:45 UTC15m
2026-07-03 CAL003 - Jul 3, 08:25 UTCJul 3, 08:55 UTC30m
2026-07-02 CAL004 - Jul 2, 17:30 UTCJul 3, 02:50 UTC9h 20m
2026-07-02 CAL004 - Jul 2, 16:05 UTCJul 2, 16:15 UTC10m
2026-07-01 CAL784 - Jul 1, 06:10 UTCJul 1, 13:55 UTC7h 45m
2026-07-01 CAL121 - Jul 1, 00:25 UTCJul 1, 04:30 UTC4h 5m
2026-06-30 CAL003 - Jun 30, 09:05 UTCJun 30, 21:40 UTC12h 35m
2026-06-29 CAL004 - Jun 29, 18:05 UTCJun 30, 03:00 UTC8h 56m
2026-06-29 CAL004 - Jun 29, 16:10 UTCJun 29, 16:25 UTC15m
2026-06-29 CAL722 - Jun 29, 07:05 UTCJun 29, 11:25 UTC4h 20m
2026-06-29 CAL721 - Jun 29, 01:10 UTCJun 29, 05:09 UTC4h 0m
2026-06-28 CAL003 - Jun 28, 08:29 UTCJun 28, 21:10 UTC12h 40m
2026-06-27 CAL004 - Jun 27, 18:09 UTCJun 28, 03:40 UTC9h 30m
2026-06-27 CAL004 - Jun 27, 16:35 UTCJun 27, 16:49 UTC15m
2026-06-27 CAL157 - Jun 27, 04:44 UTCJun 27, 07:10 UTC2h 25m
2026-06-27 CAL156 - Jun 27, 00:44 UTCJun 27, 02:55 UTC2h 10m
2026-06-26 CAL031 YVR → TPE Jun 26, 21:04 UTCJun 26, 21:30 UTC25m
2026-06-26 CAL031 YVR → TPE Jun 26, 09:24 UTCJun 26, 19:55 UTC10h 30m
2026-06-25 CAL032 TPE → YVR Jun 25, 18:59 UTCJun 26, 03:10 UTC8h 10m
2026-06-25 CAL032 TPE → YVR Jun 25, 17:14 UTCJun 25, 17:30 UTC15m
2026-06-25 CAL105 - Jun 25, 12:25 UTCJun 25, 13:20 UTC55m
2026-06-25 CAL105 - Jun 25, 09:34 UTCJun 25, 11:19 UTC1h 45m
2026-06-25 CAL104 - Jun 25, 04:40 UTCJun 25, 07:19 UTC2h 40m
2026-06-24 CAL003 - Jun 24, 08:20 UTCJun 24, 21:00 UTC12h 40m
2026-06-23 CAL004 - Jun 23, 17:54 UTCJun 24, 02:30 UTC8h 35m
2026-06-23 CAL004 - Jun 23, 15:55 UTCJun 23, 16:09 UTC15m
2026-06-21 CAL003 - Jun 21, 20:24 UTCJun 21, 20:50 UTC25m
2026-06-21 CAL003 - Jun 21, 08:25 UTCJun 21, 19:05 UTC10h 40m
2026-06-20 CAL004 - Jun 20, 18:04 UTCJun 21, 03:14 UTC9h 10m
2026-06-20 CAL004 - Jun 20, 16:00 UTCJun 20, 16:19 UTC20m

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-18051 page for operator, model, and routing details .

Mode-S 899021 frequently asked

What is Mode-S code 899021?
899021 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18051.
Where is Mode-S 899021 registered?
Mode-S code 899021 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 899021 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 899021, octal 42310041, decimal 9,015,329.
What flights does 899021 operate?
Mode-S 899021 has broadcast 20 distinct callsigns, including CAL012, CAL003, CAL004, CAL032, CAL031.