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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
Broadcasting now · callsign CAL5234 · 33,000 ft
Flights observed
330
Distinct callsigns
20
Country
TW
Last broadcast
Jul 26, 20:55 UTC

Current position

899103 is currently broadcasting. Map zoomed to live position.

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 China Airlines 31 2026-07-22
CAL5233 China Airlines 31 2026-07-23
CAL5265 - 20 2026-07-18
CAL5266 - 18 2026-07-17
CAL5640 China Airlines 15 2026-07-06
CAL5637 - 14 2026-07-06
CAL6842 - 13 2026-07-02
CAL6888 China Airlines 12 2026-07-26
CAL5240 - 10 2026-06-26
CAL5231 China Airlines 10 2026-04-24
CAL5239 - 9 2026-06-27
CAL6887 China Airlines 8 2026-07-26
CAL5928 China Airlines 8 2026-07-23
CAL5927 China Airlines 8 2026-07-23
CAL5895 China Airlines 7 2026-07-20
CAL5232 - 7 2026-04-13
CAL6841 - 6 2026-07-02
CAL5898 China Airlines 6 2026-07-25
CAL5705 - 6 2026-07-19
CAL5226 - 6 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CAL5827 TPE → TPE Jul 26, 19:20 UTCJul 26, 20:40 UTC1h 20m
2026-07-26 CAL6888 TPE → TPE Jul 26, 13:05 UTCJul 26, 14:35 UTC1h 30m
2026-07-26 CAL6888 TPE → TPE Jul 26, 12:10 UTCJul 26, 12:20 UTC10m
2026-07-26 CAL6887 TPE → HAN Jul 26, 06:40 UTCJul 26, 07:40 UTC1h 0m
2026-07-25 CAL5898 PVG → TPE Jul 25, 22:15 UTCJul 25, 22:45 UTC30m
2026-07-25 CAL5897 TPE → PVG Jul 25, 15:25 UTCJul 25, 16:05 UTC40m
2026-07-25 CAL6866 SIN → PEN Jul 25, 11:05 UTCJul 25, 12:30 UTC1h 25m
2026-07-25 CAL6866 SIN → PEN Jul 25, 08:20 UTCJul 25, 08:30 UTC10m
2026-07-25 CAL6865 SIN → PEN Jul 25, 04:45 UTCJul 25, 05:45 UTC1h 0m
2026-07-24 CAL6865 SIN → PEN Jul 24, 22:30 UTCJul 25, 02:30 UTC4h 0m
2026-07-24 CAL6852 PEN → TPE Jul 24, 18:15 UTCJul 24, 19:30 UTC1h 15m
2026-07-24 CAL6852 PEN → TPE Jul 24, 10:15 UTCJul 24, 15:10 UTC4h 55m
2026-07-24 CAL6851 TPE → PEN Jul 24, 05:30 UTCJul 24, 05:40 UTC10m
2026-07-24 CAL6851 TPE → PEN Jul 24, 02:00 UTCJul 24, 04:55 UTC2h 55m
2026-07-23 CAL5928 SZX → TPE Jul 23, 20:50 UTCJul 23, 22:05 UTC1h 15m
2026-07-23 CAL5927 TPE → SZX Jul 23, 16:10 UTCJul 23, 17:35 UTC1h 25m
2026-07-23 CAL5233 ANC → TPE Jul 23, 13:10 UTCJul 23, 13:30 UTC20m
2026-07-23 CAL5233 ANC → TPE Jul 23, 04:10 UTCJul 23, 11:50 UTC7h 40m
2026-07-22 CAL5233 ANC → TPE Jul 22, 20:10 UTCJul 23, 02:30 UTC6h 20m
2026-07-22 CAL5234 TPE → ANC Jul 22, 12:30 UTCJul 22, 17:35 UTC5h 5m
2026-07-22 CAL5234 TPE → ANC Jul 22, 04:05 UTCJul 22, 05:20 UTC1h 15m
2026-07-22 CAL5234 TPE → ANC Jul 22, 02:30 UTCJul 22, 02:50 UTC20m
2026-07-21 CAL5586 - Jul 21, 13:10 UTCJul 21, 14:45 UTC1h 35m
2026-07-21 CAL5871 TPE → SIN Jul 21, 03:50 UTCJul 21, 07:45 UTC3h 55m
2026-07-20 CAL5896 CAN → TPE Jul 20, 21:45 UTCJul 20, 23:20 UTC1h 35m
2026-07-20 CAL5895 TPE → CAN Jul 20, 17:35 UTCJul 20, 18:50 UTC1h 15m
2026-07-20 CAL6596 PEN → HAN Jul 20, 11:05 UTCJul 20, 13:25 UTC2h 20m
2026-07-19 CAL6595 - Jul 19, 23:55 UTCJul 20, 07:30 UTC7h 35m
2026-07-19 CAL6888 - Jul 19, 18:35 UTCJul 19, 20:25 UTC1h 50m
2026-07-19 CAL6887 - Jul 19, 12:15 UTCJul 19, 13:25 UTC1h 10m
2026-07-19 CAL5705 - Jul 19, 07:35 UTCJul 19, 08:00 UTC25m
2026-07-19 CAL5705 - Jul 19, 05:15 UTCJul 19, 06:30 UTC1h 15m
2026-07-18 CAL5706 TPE → NRT Jul 18, 23:25 UTCJul 19, 02:20 UTC2h 55m
2026-07-18 CAL5265 - Jul 18, 15:50 UTCJul 18, 16:05 UTC15m
2026-07-18 CAL5265 - Jul 18, 07:05 UTCJul 18, 14:40 UTC7h 35m
2026-07-18 CAL5265 DFW → ANC Jul 18, 00:10 UTCJul 18, 05:50 UTC5h 41m
2026-07-17 CAL5266 ANC → DFW Jul 17, 15:05 UTCJul 17, 20:55 UTC5h 50m
2026-07-17 CAL5266 TPE → ANC Jul 17, 05:04 UTCJul 17, 13:45 UTC8h 40m
2026-07-16 CAL5896 CAN → TPE Jul 16, 22:25 UTCJul 17, 00:10 UTC1h 45m
2026-07-16 CAL5895 - Jul 16, 18:05 UTCJul 16, 18:59 UTC55m
2026-07-16 CAL5233 - Jul 16, 16:00 UTCJul 16, 16:15 UTC15m
2026-07-16 CAL5233 - Jul 16, 07:30 UTCJul 16, 14:50 UTC7h 20m
2026-07-16 CAL5233 ORD → ANC Jul 16, 00:20 UTCJul 16, 06:05 UTC5h 45m
2026-07-15 CAL5234 ANC → ORD Jul 15, 15:45 UTCJul 15, 21:05 UTC5h 20m
2026-07-15 CAL5234 - Jul 15, 07:30 UTCJul 15, 14:30 UTC7h 0m
2026-07-15 CAL5234 - Jul 15, 06:00 UTCJul 15, 06:15 UTC15m
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

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?
Yes. Mode-S 899103 is currently airborne.
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.