Apparatus

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sensors Mode-S transponder

8990F4

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18907 · AIRBUS A-350-900

Hex
8990F4
Octal
42310364
Decimal
9,015,540
Country
TW
Tail
B-18907
Type
A359
No current signal · last broadcast 4h ago
Flights observed
218
Distinct callsigns
20
Country
TW
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 8990F4.

Country allocation

The ICAO 24-bit address 8990F4 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
CAL054 - 22 2026-07-02
CAL053 - 21 2026-07-02
CAL761 - 19 2026-07-12
CAL762 - 16 2026-07-12
CAL062 - 14 2026-07-11
CAL061 - 10 2026-07-09
CAL074 - 7 2026-07-13
CAL073 - 7 2026-07-12
CAL052 China Airlines 7 2026-06-08
CAL051 China Airlines 6 2026-06-07
CAL831 - 5 2026-06-17
CAL504 China Airlines 5 2026-06-05
CAL502 - 5 2026-07-09
CAL082 - 5 2026-07-04
CAL081 - 5 2026-07-04
CAL064 - 5 2026-04-13
CAL832 - 4 2026-06-17
CAL501 China Airlines 4 2026-06-11
CAL152 - 4 2026-06-13
CAL100 China Airlines 4 2026-06-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CAL074 - Jul 13, 09:25 UTCJul 13, 22:00 UTC12h 35m
2026-07-12 CAL073 - Jul 12, 15:55 UTCJul 13, 05:35 UTC13h 40m
2026-07-12 CAL762 - Jul 12, 10:10 UTCJul 12, 13:30 UTC3h 20m
2026-07-12 CAL761 - Jul 12, 06:30 UTCJul 12, 06:45 UTC15m
2026-07-12 CAL761 - Jul 12, 02:01 UTCJul 12, 05:01 UTC3h 0m
2026-07-11 CAL062 FRA → TPE Jul 11, 09:40 UTCJul 11, 22:10 UTC12h 30m
2026-07-09 CAL061 - Jul 9, 15:40 UTCJul 10, 05:10 UTC13h 30m
2026-07-09 CAL502 - Jul 9, 01:05 UTCJul 9, 07:25 UTC6h 20m
2026-07-08 CAL076 - Jul 8, 09:30 UTCJul 8, 21:35 UTC12h 5m
2026-07-07 CAL075 TPE → FCO Jul 7, 16:30 UTCJul 8, 05:25 UTC12h 55m
2026-07-07 CAL762 - Jul 7, 10:05 UTCJul 7, 13:15 UTC3h 10m
2026-07-07 CAL761 - Jul 7, 01:35 UTCJul 7, 04:45 UTC3h 10m
2026-07-06 CAL074 AMS → TPE Jul 6, 09:25 UTCJul 6, 22:05 UTC12h 40m
2026-07-05 CAL073 TPE → AMS Jul 5, 15:30 UTCJul 6, 05:20 UTC13h 50m
2026-07-04 CAL082 - Jul 4, 20:55 UTCJul 5, 09:55 UTC13h 0m
2026-07-04 CAL081 - Jul 4, 02:00 UTCJul 4, 16:15 UTC14h 15m
2026-07-03 CAL754 - Jul 3, 10:00 UTCJul 3, 11:00 UTC1h 0m
2026-07-03 CAL753 - Jul 3, 00:55 UTCJul 3, 05:00 UTC4h 5m
2026-07-02 CAL054 - Jul 2, 21:00 UTCJul 2, 21:20 UTC20m
2026-07-02 CAL054 - Jul 2, 13:10 UTCJul 2, 14:40 UTC1h 30m
2026-07-02 CAL054 - Jul 2, 07:40 UTCJul 2, 11:10 UTC3h 30m
2026-07-02 CAL053 BNE → AKL Jul 2, 03:00 UTCJul 2, 05:35 UTC2h 35m
2026-07-01 CAL053 TPE → BNE Jul 1, 16:15 UTCJul 2, 00:10 UTC7h 55m
2026-07-01 CAL762 - Jul 1, 09:50 UTCJul 1, 13:10 UTC3h 20m
2026-07-01 CAL762 - Jul 1, 08:10 UTCJul 1, 08:20 UTC10m
2026-07-01 CAL761 - Jul 1, 06:10 UTCJul 1, 06:35 UTC25m
2026-07-01 CAL761 - Jul 1, 01:45 UTCJul 1, 04:45 UTC3h 0m
2026-06-30 CAL062 FRA → TPE Jun 30, 09:40 UTCJun 30, 21:50 UTC12h 10m
2026-06-29 CAL061 TPE → FRA Jun 29, 14:54 UTCJun 30, 04:30 UTC13h 36m
2026-06-27 CAL062 FRA → TPE Jun 27, 09:40 UTCJun 27, 21:50 UTC12h 10m
2026-06-26 CAL061 TPE → FRA Jun 26, 14:44 UTCJun 27, 04:05 UTC13h 20m
2026-06-25 CAL762 - Jun 25, 09:45 UTCJun 25, 13:45 UTC4h 0m
2026-06-25 CAL762 - Jun 25, 08:04 UTCJun 25, 08:14 UTC10m
2026-06-25 CAL761 - Jun 25, 05:50 UTCJun 25, 06:05 UTC15m
2026-06-25 CAL761 - Jun 25, 01:30 UTCJun 25, 04:29 UTC3h 0m
2026-06-24 CAL062 FRA → TPE Jun 24, 09:45 UTCJun 24, 22:10 UTC12h 25m
2026-06-23 CAL061 TPE → FRA Jun 23, 14:59 UTCJun 24, 04:30 UTC13h 30m
2026-06-22 CAL082 - Jun 22, 20:39 UTCJun 23, 10:04 UTC13h 25m
2026-06-22 CAL081 TPE → LHR Jun 22, 01:05 UTCJun 22, 15:14 UTC14h 10m
2026-06-21 CAL076 - Jun 21, 09:29 UTCJun 21, 21:24 UTC11h 55m
2026-06-20 CAL075 TPE → FCO Jun 20, 15:54 UTCJun 21, 05:20 UTC13h 25m
2026-06-20 CAL784 TPE → TPE Jun 20, 06:14 UTCJun 20, 13:49 UTC7h 35m
2026-06-19 CAL062 FRA → TPE Jun 19, 09:44 UTCJun 19, 21:54 UTC12h 10m
2026-06-18 CAL061 TPE → FRA Jun 18, 15:00 UTCJun 19, 04:29 UTC13h 29m
2026-06-18 CAL762 - Jun 18, 09:50 UTCJun 18, 13:05 UTC3h 15m
2026-06-18 CAL761 - Jun 18, 06:05 UTCJun 18, 06:20 UTC15m
2026-06-18 CAL761 - Jun 18, 01:45 UTCJun 18, 04:40 UTC2h 55m
2026-06-17 CAL832 - Jun 17, 07:10 UTCJun 17, 10:40 UTC3h 30m
2026-06-17 CAL831 - Jun 17, 02:35 UTCJun 17, 05:35 UTC3h 0m
2026-06-16 CAL058 MEL → TPE Jun 16, 12:14 UTCJun 16, 21:20 UTC9h 6m

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-18907 page for operator, model, and routing details .

Mode-S 8990F4 frequently asked

What is Mode-S code 8990F4?
8990F4 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18907.
Where is Mode-S 8990F4 registered?
Mode-S code 8990F4 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8990F4 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 8990F4, octal 42310364, decimal 9,015,540.
What flights does 8990F4 operate?
Mode-S 8990F4 has broadcast 20 distinct callsigns, including CAL054, CAL053, CAL761, CAL762, CAL062.