sensors Mode-S transponder
89917B
ICAO 24-bit transponder address · allocated to Taiwan
Currently assigned to B-58901 · BELL 407
- Hex
- 89917B
- Octal
- 42310573
- Decimal
- 9,015,675
- Country
- TW
- Tail
- B-58901
- Type
- B407
- Flights observed
- 12
- Distinct callsigns
- 5
- Country
- TW
- Last broadcast
- 13d ago
Last known position
Country allocation
The ICAO 24-bit address 89917B 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 5 distinct
Recent flights last 12
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-21 | GRA21 | - | May 21, 00:40 UTC | May 21, 01:35 UTC | 55m |
| 2026-05-19 | GRA31 | - | May 19, 22:05 UTC | May 20, 02:15 UTC | 4h 10m |
| 2026-05-19 | GRA21 | - | May 19, 01:05 UTC | May 19, 01:55 UTC | 50m |
| 2026-05-13 | GRA11 | HCN → KHH | May 13, 03:50 UTC | May 13, 04:45 UTC | 55m |
| 2026-05-13 | GRA11 | KHH → HCN | May 13, 02:05 UTC | May 13, 03:05 UTC | 1h 0m |
| 2026-05-11 | GRA21 | - | May 11, 22:00 UTC | May 11, 22:35 UTC | 34m |
| 2026-04-26 | GRA21 | - | Apr 26, 22:45 UTC | Apr 27, 00:45 UTC | 2h 0m |
| 2026-04-25 | GRA21 | - | Apr 25, 23:45 UTC | Apr 26, 02:45 UTC | 3h 0m |
| 2026-04-22 | GRA21 | - | Apr 22, 04:40 UTC | Apr 22, 05:35 UTC | 55m |
| 2026-04-21 | GRA21 | - | Apr 21, 02:45 UTC | Apr 21, 03:40 UTC | 55m |
| 2026-04-16 | GRA12 | KHH → KHH | Apr 16, 03:55 UTC | Apr 16, 05:00 UTC | 1h 5m |
| 2026-04-15 | GRA11I | KHH → KHH | Apr 15, 23:55 UTC | Apr 16, 00:50 UTC | 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-58901 page for operator, model, and routing details .