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
Broadcasting now · callsign CAL062 · 35,000 ft
Flights observed
235
Distinct callsigns
20
Country
TW
Last broadcast
Jul 26, 13:45 UTC

Current position

899021 is currently broadcasting. Map zoomed to live position.

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
CAL031 China Airlines 23 2026-07-23
CAL003 - 23 2026-07-25
CAL032 China Airlines 21 2026-07-22
CAL004 - 20 2026-07-24
CAL012 China Airlines 19 2026-06-07
CAL011 China Airlines 16 2026-06-08
CAL008 - 10 2026-06-03
CAL781 China Airlines 9 2026-05-30
CAL784 China Airlines 7 2026-07-21
CAL157 - 7 2026-06-27
CAL024 China Airlines 7 2026-05-29
CAL023 China Airlines 7 2026-05-30
CAL007 - 6 2026-06-03
CAL772 China Airlines 5 2026-06-02
CAL101 China Airlines 5 2026-06-12
CAL721 China Airlines 4 2026-07-22
CAL831 China Airlines 3 2026-04-15
CAL722 China Airlines 3 2026-07-19
CAL501 China Airlines 3 2026-07-26
CAL173 China Airlines 3 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CAL173 KIX → TPE Jul 26, 11:25 UTCJul 26, 13:45 UTC2h 20m
2026-07-26 CAL172 TPE → KIX Jul 26, 07:30 UTCJul 26, 09:45 UTC2h 15m
2026-07-26 CAL501 TPE → PVG Jul 26, 01:00 UTCJul 26, 05:50 UTC4h 50m
2026-07-25 CAL003 - Jul 25, 20:05 UTCJul 25, 20:20 UTC15m
2026-07-25 CAL003 - Jul 25, 08:25 UTCJul 25, 18:50 UTC10h 25m
2026-07-24 CAL004 - Jul 24, 16:30 UTCJul 25, 04:10 UTC11h 40m
2026-07-23 CAL031 YVR → TPE Jul 23, 10:10 UTCJul 23, 21:45 UTC11h 35m
2026-07-22 CAL032 TPE → YVR Jul 22, 16:10 UTCJul 23, 02:50 UTC10h 40m
2026-07-22 CAL721 TPE → KUL Jul 22, 01:45 UTCJul 22, 12:00 UTC10h 15m
2026-07-21 CAL784 SGN → TPE Jul 21, 05:50 UTCJul 21, 13:55 UTC8h 5m
2026-07-20 CAL031 - Jul 20, 20:05 UTCJul 20, 20:35 UTC30m
2026-07-20 CAL031 - Jul 20, 09:10 UTCJul 20, 18:55 UTC9h 45m
2026-07-19 CAL032 TPE → YVR Jul 19, 15:55 UTCJul 20, 02:40 UTC10h 45m
2026-07-19 CAL722 KUL → TPE Jul 19, 07:45 UTCJul 19, 12:05 UTC4h 20m
2026-07-19 CAL721 TPE → KUL Jul 19, 01:25 UTCJul 19, 05:35 UTC4h 10m
2026-07-18 CAL031 - Jul 18, 20:30 UTCJul 18, 20:50 UTC20m
2026-07-18 CAL031 - Jul 18, 09:20 UTCJul 18, 19:20 UTC10h 0m
2026-07-17 CAL032 - Jul 17, 17:30 UTCJul 18, 03:35 UTC10h 6m
2026-07-17 CAL032 - Jul 17, 16:44 UTCJul 17, 16:59 UTC15m
2026-07-17 CAL504 TPE → TPE Jul 17, 08:49 UTCJul 17, 13:25 UTC4h 35m
2026-07-16 CAL003 - Jul 16, 20:29 UTCJul 16, 20:49 UTC20m
2026-07-16 CAL003 - Jul 16, 08:45 UTCJul 16, 19:14 UTC10h 30m
2026-07-15 CAL004 - Jul 15, 17:00 UTCJul 16, 04:45 UTC11h 45m
2026-07-15 CAL784 TPE → TPE Jul 15, 06:15 UTCJul 15, 14:30 UTC8h 15m
2026-07-14 CAL031 - Jul 14, 20:25 UTCJul 14, 20:55 UTC30m
2026-07-14 CAL031 - Jul 14, 09:20 UTCJul 14, 19:20 UTC10h 0m
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

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?
Yes. Mode-S 899021 is currently airborne.
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 CAL031, CAL003, CAL032, CAL004, CAL012.