Apparatus

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sensors Mode-S transponder

899103

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18717 · BOEING 747-400

Hex
899103
Octal
42310403
Decimal
9,015,555
Country
TW
Tail
B-18717
Type
B744
No current signal · last broadcast 4h ago
Flights observed
284
Distinct callsigns
20
Country
TW
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 899103.

Country allocation

The ICAO 24-bit address 899103 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
CAL5234 - 25 2026-07-01
CAL5233 - 25 2026-07-01
CAL5265 - 17 2026-06-30
CAL5266 - 16 2026-06-29
CAL5640 China Airlines 15 2026-07-06
CAL5637 - 14 2026-07-06
CAL6842 - 13 2026-07-02
CAL5240 - 10 2026-06-26
CAL5231 China Airlines 10 2026-04-24
CAL6888 - 9 2026-07-14
CAL5239 - 9 2026-06-27
CAL5928 China Airlines 7 2026-06-02
CAL5927 China Airlines 7 2026-06-02
CAL5232 - 7 2026-04-13
CAL6887 - 6 2026-07-14
CAL6841 - 6 2026-07-02
CAL5226 - 6 2026-07-09
CAL5898 - 5 2026-06-17
CAL5895 China Airlines 5 2026-06-08
CAL5706 - 4 2026-06-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CAL5894 - Jul 14, 23:00 UTCJul 15, 00:20 UTC1h 20m
2026-07-14 CAL5893 - Jul 14, 18:20 UTCJul 14, 19:05 UTC45m
2026-07-14 CAL6888 - Jul 14, 14:35 UTCJul 14, 16:05 UTC1h 30m
2026-07-14 CAL6887 - Jul 14, 08:25 UTCJul 14, 09:35 UTC1h 10m
2026-07-13 CAL5897 TPE → TPE Jul 13, 19:30 UTCJul 14, 01:55 UTC6h 25m
2026-07-13 CAL6705 NRT → TPE Jul 13, 13:20 UTCJul 13, 16:05 UTC2h 45m
2026-07-13 CAL6706 TPE → NRT Jul 13, 07:45 UTCJul 13, 10:40 UTC2h 55m
2026-07-13 CAL6888 - Jul 13, 01:50 UTCJul 13, 03:25 UTC1h 35m
2026-07-13 CAL6888 - Jul 13, 01:01 UTCJul 13, 01:10 UTC10m
2026-07-12 CAL6887 - Jul 12, 19:05 UTCJul 12, 20:15 UTC1h 10m
2026-07-12 CAL5225 ANC → TPE Jul 12, 05:10 UTCJul 12, 14:15 UTC9h 5m
2026-07-10 CAL5225 - Jul 10, 23:35 UTCJul 11, 05:15 UTC5h 40m
2026-07-09 CAL5226 - Jul 9, 14:45 UTCJul 9, 20:00 UTC5h 15m
2026-07-09 CAL5226 - Jul 9, 06:05 UTCJul 9, 13:15 UTC7h 10m
2026-07-09 CAL5226 - Jul 9, 04:40 UTCJul 9, 04:55 UTC15m
2026-07-07 CAL5894 CAN → TPE Jul 7, 22:05 UTCJul 7, 23:30 UTC1h 25m
2026-07-07 CAL5893 TPE → CAN Jul 7, 17:00 UTCJul 7, 18:00 UTC1h 0m
2026-07-07 CAL5838 HKG → TPE Jul 7, 13:15 UTCJul 7, 14:55 UTC1h 40m
2026-07-07 CAL5837 TPE → HKG Jul 7, 08:15 UTCJul 7, 09:45 UTC1h 30m
2026-07-06 CAL5640 LUX → TPE Jul 6, 23:45 UTCJul 7, 05:55 UTC6h 10m
2026-07-06 CAL5640 LUX → TPE Jul 6, 15:00 UTCJul 6, 22:00 UTC7h 0m
2026-07-06 CAL5637 DEL → LUX Jul 6, 03:15 UTCJul 6, 11:20 UTC8h 5m
2026-07-05 CAL5637 TPE → DEL Jul 5, 18:50 UTCJul 6, 00:50 UTC6h 0m
2026-07-05 CAL5640 LUX → TPE Jul 5, 01:15 UTCJul 5, 03:45 UTC2h 30m
2026-07-04 CAL5640 LUX → TPE Jul 4, 15:30 UTCJul 4, 22:40 UTC7h 10m
2026-07-04 CAL5637 DEL → LUX Jul 4, 04:00 UTCJul 4, 12:15 UTC8h 15m
2026-07-03 CAL5637 - Jul 3, 19:45 UTCJul 4, 01:30 UTC5h 45m
2026-07-03 CAL6652 - Jul 3, 10:40 UTCJul 3, 16:45 UTC6h 5m
2026-07-03 CAL6651 TPE → BKK Jul 3, 05:25 UTCJul 3, 08:35 UTC3h 10m
2026-07-02 CAL6842 HKG → TPE Jul 2, 23:45 UTCJul 3, 01:05 UTC1h 20m
2026-07-02 CAL6842 - Jul 2, 20:05 UTCJul 2, 21:35 UTC1h 30m
2026-07-02 CAL6841 TPE → MNL Jul 2, 15:25 UTCJul 2, 17:10 UTC1h 45m
2026-07-01 CAL5233 ANC → TPE Jul 1, 23:30 UTCJul 2, 09:00 UTC9h 30m
2026-07-01 CAL5233 - Jul 1, 16:40 UTCJul 1, 22:05 UTC5h 25m
2026-07-01 CAL5234 ANC → ORD Jul 1, 07:20 UTCJul 1, 12:55 UTC5h 35m
2026-06-30 CAL5234 TPE → ANC Jun 30, 21:00 UTCJul 1, 05:15 UTC8h 15m
2026-06-30 CAL5265 ANC → TPE Jun 30, 08:20 UTCJun 30, 17:30 UTC9h 10m
2026-06-30 CAL5265 DFW → ANC Jun 30, 01:14 UTCJun 30, 07:00 UTC5h 45m
2026-06-29 CAL5266 - Jun 29, 16:50 UTCJun 29, 22:30 UTC5h 40m
2026-06-29 CAL5266 - Jun 29, 02:45 UTCJun 29, 11:04 UTC8h 20m
2026-06-28 CAL6888 - Jun 28, 19:04 UTCJun 28, 21:20 UTC2h 15m
2026-06-28 CAL6887 - Jun 28, 12:50 UTCJun 28, 15:44 UTC2h 55m
2026-06-27 CAL5239 - Jun 27, 22:20 UTCJun 27, 22:49 UTC30m
2026-06-27 CAL5239 - Jun 27, 13:20 UTCJun 27, 20:49 UTC7h 30m
2026-06-27 CAL5239 ORD → ANC Jun 27, 06:09 UTCJun 27, 11:39 UTC5h 30m
2026-06-26 CAL5240 ANC → ORD Jun 26, 21:50 UTCJun 27, 03:09 UTC5h 20m
2026-06-26 CAL5240 - Jun 26, 13:19 UTCJun 26, 20:20 UTC7h 0m
2026-06-26 CAL5240 - Jun 26, 11:55 UTCJun 26, 12:10 UTC15m
2026-06-26 CAL5640 LUX → TPE Jun 26, 02:00 UTCJun 26, 04:24 UTC2h 25m
2026-06-25 CAL5640 LUX → TPE Jun 25, 16:24 UTCJun 25, 23:39 UTC7h 15m

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-18717 page for operator, model, and routing details .

Mode-S 899103 frequently asked

What is Mode-S code 899103?
899103 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18717.
Where is Mode-S 899103 registered?
Mode-S code 899103 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 899103 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 899103, octal 42310403, decimal 9,015,555.
What flights does 899103 operate?
Mode-S 899103 has broadcast 20 distinct callsigns, including CAL5234, CAL5233, CAL5265, CAL5266, CAL5640.