Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 1h ago
Flights observed
115
Distinct callsigns
20
Country
TW
Last broadcast
1h 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 14 2026-05-23
CAL011 China Airlines 13 2026-05-24
CAL781 China Airlines 8 2026-05-22
CAL008 - 8 2026-05-21
CAL024 China Airlines 7 2026-05-29
CAL003 - 7 2026-05-28
CAL023 China Airlines 6 2026-05-14
CAL031 China Airlines 5 2026-04-25
CAL007 - 5 2026-05-22
CAL004 - 5 2026-05-27
CAL772 China Airlines 4 2026-05-25
CAL157 China Airlines 4 2026-05-07
CAL101 China Airlines 4 2026-05-29
CAL831 China Airlines 3 2026-04-15
CAL032 China Airlines 3 2026-04-24
CAL832 China Airlines 2 2026-04-15
CAL782 China Airlines 2 2026-04-21
CAL501 China Airlines 2 2026-05-20
CAL173 China Airlines 2 2026-05-15
CAL156 China Airlines 2 2026-05-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 CAL024 TPE → ONT May 29, 15:30 UTCMay 30, 00:15 UTC8h 45m
2026-05-29 CAL024 TPE → ONT May 29, 13:50 UTCMay 29, 14:00 UTC10m
2026-05-29 CAL101 NRT → TPE May 29, 06:20 UTCMay 29, 09:30 UTC3h 10m
2026-05-29 CAL100 TPE → NRT May 29, 01:20 UTCMay 29, 04:10 UTC2h 50m
2026-05-28 CAL003 SFO → TPE May 28, 08:25 UTCMay 28, 21:25 UTC13h 0m
2026-05-27 CAL004 - May 27, 15:50 UTCMay 28, 03:10 UTC11h 20m
2026-05-27 CAL504 PVG → TPE May 27, 08:40 UTCMay 27, 13:35 UTC4h 55m
2026-05-26 CAL003 - May 26, 21:14 UTCMay 26, 21:40 UTC25m
2026-05-26 CAL003 - May 26, 08:34 UTCMay 26, 20:00 UTC11h 25m
2026-05-25 CAL004 - May 25, 16:00 UTCMay 26, 03:19 UTC11h 19m
2026-05-25 CAL772 DPS → TPE May 25, 02:00 UTCMay 25, 12:55 UTC10h 55m
2026-05-24 CAL011 JFK → TPE May 24, 20:40 UTCMay 24, 21:05 UTC25m
2026-05-24 CAL011 JFK → TPE May 24, 05:55 UTCMay 24, 19:25 UTC13h 30m
2026-05-23 CAL012 TPE → JFK May 23, 11:55 UTCMay 24, 00:20 UTC12h 25m
2026-05-23 CAL012 TPE → JFK May 23, 10:05 UTCMay 23, 10:20 UTC15m
2026-05-22 CAL781 TPE → SGN May 22, 23:35 UTCMay 23, 07:05 UTC7h 29m
2026-05-22 CAL007 - May 22, 20:25 UTCMay 22, 20:50 UTC25m
2026-05-22 CAL007 - May 22, 07:20 UTCMay 22, 07:45 UTC25m
2026-05-21 CAL008 - May 21, 18:15 UTCMay 22, 03:30 UTC9h 15m
2026-05-21 CAL008 - May 21, 16:15 UTCMay 21, 16:30 UTC15m
2026-05-21 CAL772 DPS → TPE May 21, 01:50 UTCMay 21, 13:10 UTC11h 20m
2026-05-20 CAL503 TPE → PVG May 20, 09:15 UTCMay 20, 14:10 UTC4h 55m
2026-05-20 CAL501 TPE → PVG May 20, 01:05 UTCMay 20, 06:00 UTC4h 56m
2026-05-19 CAL003 - May 19, 21:20 UTCMay 19, 21:35 UTC15m
2026-05-19 CAL003 - May 19, 08:45 UTCMay 19, 20:45 UTC12h 0m
2026-05-18 CAL004 - May 18, 15:55 UTCMay 19, 02:55 UTC10h 59m
2026-05-17 CAL772 DPS → TPE May 17, 01:20 UTCMay 17, 13:01 UTC11h 40m
2026-05-16 CAL007 - May 16, 20:45 UTCMay 16, 21:10 UTC25m
2026-05-16 CAL007 - May 16, 07:25 UTCMay 16, 19:25 UTC12h 0m
2026-05-15 CAL008 - May 15, 16:30 UTCMay 16, 03:45 UTC11h 15m
2026-05-15 CAL173 KIX → TPE May 15, 12:30 UTCMay 15, 13:00 UTC30m
2026-05-15 CAL173 KIX → TPE May 15, 10:45 UTCMay 15, 11:10 UTC25m
2026-05-15 CAL172 TPE → KIX May 15, 06:45 UTCMay 15, 09:05 UTC2h 20m
2026-05-14 CAL023 ONT → TPE May 14, 07:30 UTCMay 14, 20:40 UTC13h 10m
2026-05-13 CAL024 TPE → ONT May 13, 14:45 UTCMay 14, 02:00 UTC11h 15m
2026-05-12 CAL003 - May 12, 08:30 UTCMay 12, 21:05 UTC12h 35m
2026-05-11 CAL004 - May 11, 15:55 UTCMay 11, 17:55 UTC2h 0m
2026-05-10 CAL781 TPE → SGN May 10, 23:39 UTCMay 11, 07:05 UTC7h 25m
2026-05-10 CAL011 JFK → TPE May 10, 05:34 UTCMay 10, 21:30 UTC15h 55m
2026-05-09 CAL012 TPE → JFK May 9, 12:05 UTCMay 10, 00:15 UTC12h 10m
2026-05-09 CAL012 TPE → JFK May 9, 10:20 UTCMay 9, 10:30 UTC10m
2026-05-08 CAL011 JFK → TPE May 8, 06:20 UTCMay 8, 23:00 UTC16h 40m
2026-05-07 CAL012 TPE → JFK May 7, 12:00 UTCMay 8, 00:44 UTC12h 45m
2026-05-07 CAL012 TPE → JFK May 7, 10:25 UTCMay 7, 10:35 UTC10m
2026-05-07 CAL157 KIX → TPE May 7, 06:40 UTCMay 7, 07:05 UTC25m
2026-05-07 CAL157 KIX → TPE May 7, 02:25 UTCMay 7, 05:10 UTC2h 45m
2026-05-07 CAL156 TPE → KIX May 7, 00:55 UTCMay 7, 01:10 UTC15m
2026-05-06 CAL011 JFK → TPE May 6, 21:10 UTCMay 6, 21:40 UTC30m
2026-05-06 CAL011 JFK → TPE May 6, 05:50 UTCMay 6, 19:50 UTC13h 59m
2026-05-05 CAL012 TPE → JFK May 5, 12:10 UTCMay 6, 00:35 UTC12h 25m

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 1h 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, CAL011, CAL781, CAL008, CAL024.