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
- Flights observed
- 245
- Distinct callsigns
- 20
- Country
- TW
- Last broadcast
- Jul 26, 21:25 UTC
Last known position
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 | China Airlines | 25 | 2026-07-26 |
| CAL053 | China Airlines | 23 | 2026-07-26 |
| CAL761 | - | 19 | 2026-07-12 |
| CAL062 | China Airlines | 17 | 2026-07-24 |
| CAL762 | - | 16 | 2026-07-12 |
| CAL061 | China Airlines | 13 | 2026-07-23 |
| CAL052 | - | 8 | 2026-07-15 |
| CAL074 | - | 7 | 2026-07-13 |
| CAL073 | - | 7 | 2026-07-12 |
| CAL051 | - | 7 | 2026-07-14 |
| CAL504 | - | 6 | 2026-07-14 |
| CAL152 | China Airlines | 6 | 2026-07-18 |
| CAL024 | China Airlines | 6 | 2026-07-21 |
| CAL831 | - | 5 | 2026-06-17 |
| CAL502 | - | 5 | 2026-07-09 |
| CAL501 | China Airlines | 5 | 2026-07-23 |
| CAL153 | - | 5 | 2026-07-18 |
| CAL082 | - | 5 | 2026-07-04 |
| CAL081 | - | 5 | 2026-07-04 |
| CAL064 | - | 5 | 2026-04-13 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | CAL054 | BNE → TPE | Jul 26, 13:00 UTC | Jul 26, 21:20 UTC | 8h 20m |
| 2026-07-26 | CAL054 | BNE → TPE | Jul 26, 10:05 UTC | Jul 26, 11:05 UTC | 1h 0m |
| 2026-07-26 | CAL054 | BNE → TPE | Jul 26, 07:40 UTC | Jul 26, 08:05 UTC | 25m |
| 2026-07-26 | CAL053 | TPE → BNE | Jul 26, 03:15 UTC | Jul 26, 05:45 UTC | 2h 30m |
| 2026-07-25 | CAL053 | TPE → BNE | Jul 25, 16:20 UTC | Jul 26, 00:25 UTC | 8h 5m |
| 2026-07-25 | CAL783 | TPE → SGN | Jul 25, 05:55 UTC | Jul 25, 14:00 UTC | 8h 5m |
| 2026-07-24 | CAL062 | FRA → TPE | Jul 24, 09:35 UTC | Jul 24, 21:30 UTC | 11h 55m |
| 2026-07-23 | CAL061 | TPE → FRA | Jul 23, 15:20 UTC | Jul 24, 04:40 UTC | 13h 20m |
| 2026-07-23 | CAL501 | TPE → PVG | Jul 23, 01:05 UTC | Jul 23, 07:10 UTC | 6h 5m |
| 2026-07-22 | CAL023 | - | Jul 22, 19:15 UTC | Jul 22, 20:20 UTC | 1h 5m |
| 2026-07-21 | CAL024 | TPE → ONT | Jul 21, 15:05 UTC | Jul 22, 01:50 UTC | 10h 45m |
| 2026-07-21 | CAL024 | TPE → ONT | Jul 21, 13:35 UTC | Jul 21, 13:50 UTC | 15m |
| 2026-07-21 | CAL522 | CAN → TPE | Jul 21, 09:55 UTC | Jul 21, 11:30 UTC | 1h 35m |
| 2026-07-21 | CAL521 | TPE → CAN | Jul 21, 06:40 UTC | Jul 21, 07:25 UTC | 45m |
| 2026-07-20 | CAL062 | - | Jul 20, 09:25 UTC | Jul 20, 21:25 UTC | 12h 0m |
| 2026-07-19 | CAL061 | - | Jul 19, 15:05 UTC | Jul 19, 19:45 UTC | 4h 40m |
| 2026-07-19 | CAL528 | - | Jul 19, 10:20 UTC | Jul 19, 11:50 UTC | 1h 30m |
| 2026-07-19 | CAL527 | - | Jul 19, 07:15 UTC | Jul 19, 08:35 UTC | 1h 20m |
| 2026-07-18 | CAL153 | - | Jul 18, 07:10 UTC | Jul 18, 07:25 UTC | 15m |
| 2026-07-18 | CAL153 | - | Jul 18, 05:20 UTC | Jul 18, 06:00 UTC | 40m |
| 2026-07-18 | CAL152 | TPE → KIX | Jul 18, 03:05 UTC | Jul 18, 03:50 UTC | 45m |
| 2026-07-18 | CAL152 | TPE → KIX | Jul 18, 01:30 UTC | Jul 18, 01:39 UTC | 10m |
| 2026-07-17 | CAL062 | - | Jul 17, 09:40 UTC | Jul 17, 19:15 UTC | 9h 35m |
| 2026-07-16 | CAL061 | - | Jul 16, 15:30 UTC | Jul 17, 04:20 UTC | 12h 50m |
| 2026-07-15 | CAL052 | SYD → TPE | Jul 15, 12:40 UTC | Jul 15, 21:10 UTC | 8h 30m |
| 2026-07-14 | CAL051 | TPE → SYD | Jul 14, 16:20 UTC | Jul 15, 00:55 UTC | 8h 34m |
| 2026-07-14 | CAL504 | - | Jul 14, 09:20 UTC | Jul 14, 14:15 UTC | 4h 55m |
| 2026-07-13 | CAL074 | - | Jul 13, 09:25 UTC | Jul 13, 22:00 UTC | 12h 35m |
| 2026-07-12 | CAL073 | - | Jul 12, 15:55 UTC | Jul 13, 05:35 UTC | 13h 40m |
| 2026-07-12 | CAL762 | - | Jul 12, 10:10 UTC | Jul 12, 13:30 UTC | 3h 20m |
| 2026-07-12 | CAL761 | - | Jul 12, 06:30 UTC | Jul 12, 06:45 UTC | 15m |
| 2026-07-12 | CAL761 | - | Jul 12, 02:01 UTC | Jul 12, 05:01 UTC | 3h 0m |
| 2026-07-11 | CAL062 | FRA → TPE | Jul 11, 09:40 UTC | Jul 11, 22:10 UTC | 12h 30m |
| 2026-07-09 | CAL061 | - | Jul 9, 15:40 UTC | Jul 10, 05:10 UTC | 13h 30m |
| 2026-07-09 | CAL502 | - | Jul 9, 01:05 UTC | Jul 9, 07:25 UTC | 6h 20m |
| 2026-07-08 | CAL076 | - | Jul 8, 09:30 UTC | Jul 8, 21:35 UTC | 12h 5m |
| 2026-07-07 | CAL075 | TPE → FCO | Jul 7, 16:30 UTC | Jul 8, 05:25 UTC | 12h 55m |
| 2026-07-07 | CAL762 | - | Jul 7, 10:05 UTC | Jul 7, 13:15 UTC | 3h 10m |
| 2026-07-07 | CAL761 | - | Jul 7, 01:35 UTC | Jul 7, 04:45 UTC | 3h 10m |
| 2026-07-06 | CAL074 | AMS → TPE | Jul 6, 09:25 UTC | Jul 6, 22:05 UTC | 12h 40m |
| 2026-07-05 | CAL073 | TPE → AMS | Jul 5, 15:30 UTC | Jul 6, 05:20 UTC | 13h 50m |
| 2026-07-04 | CAL082 | - | Jul 4, 20:55 UTC | Jul 5, 09:55 UTC | 13h 0m |
| 2026-07-04 | CAL081 | - | Jul 4, 02:00 UTC | Jul 4, 16:15 UTC | 14h 15m |
| 2026-07-03 | CAL754 | - | Jul 3, 10:00 UTC | Jul 3, 11:00 UTC | 1h 0m |
| 2026-07-03 | CAL753 | - | Jul 3, 00:55 UTC | Jul 3, 05:00 UTC | 4h 5m |
| 2026-07-02 | CAL054 | - | Jul 2, 21:00 UTC | Jul 2, 21:20 UTC | 20m |
| 2026-07-02 | CAL054 | - | Jul 2, 13:10 UTC | Jul 2, 14:40 UTC | 1h 30m |
| 2026-07-02 | CAL054 | - | Jul 2, 07:40 UTC | Jul 2, 11:10 UTC | 3h 30m |
| 2026-07-02 | CAL053 | BNE → AKL | Jul 2, 03:00 UTC | Jul 2, 05:35 UTC | 2h 35m |
| 2026-07-01 | CAL053 | TPE → BNE | Jul 1, 16:15 UTC | Jul 2, 00:10 UTC | 7h 55m |
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 .