sensors Mode-S transponder
8990A6
ICAO 24-bit transponder address · allocated to Taiwan
Currently assigned to B-18781 · BOEING 777-200LR
- Hex
- 8990A6
- Octal
- 42310246
- Decimal
- 9,015,462
- Country
- TW
- Tail
- B-18781
- Type
- B77L
- Flights observed
- 300
- Distinct callsigns
- 20
- Country
- TW
- Last broadcast
- 4h ago
Last known position
Country allocation
The ICAO 24-bit address 8990A6 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 |
|---|---|---|---|
| CAL5686 | - | 20 | 2026-06-25 |
| CAL5314 | - | 19 | 2026-06-20 |
| CAL5685 | - | 18 | 2026-06-24 |
| CAL5313 | China Airlines | 18 | 2026-06-21 |
| CAL5310 | - | 15 | 2026-06-22 |
| CAL5141 | - | 12 | 2026-07-12 |
| CAL5137 | - | 12 | 2026-07-08 |
| CAL5142 | - | 10 | 2026-07-10 |
| CAL5138 | - | 10 | 2026-07-07 |
| CAL5825 | - | 9 | 2026-06-27 |
| CAL5309 | - | 9 | 2026-06-23 |
| CAL5153 | China Airlines | 9 | 2026-06-16 |
| CAL5837 | - | 8 | 2026-06-30 |
| CAL5835 | - | 8 | 2026-07-06 |
| CAL5831 | China Airlines | 7 | 2026-06-07 |
| CAL5162 | - | 7 | 2026-06-18 |
| CAL5161 | - | 7 | 2026-06-19 |
| CAL5154 | China Airlines | 7 | 2026-06-15 |
| CAL5116 | - | 6 | 2026-06-11 |
| CAL5836 | - | 5 | 2026-07-06 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-14 | CAL5235 | ORD → SEA | Jul 14, 02:20 UTC | Jul 14, 06:10 UTC | 3h 50m |
| 2026-07-13 | CAL5236 | - | Jul 13, 18:10 UTC | Jul 13, 23:30 UTC | 5h 20m |
| 2026-07-13 | CAL5236 | TPE → ANC | Jul 13, 07:50 UTC | Jul 13, 16:30 UTC | 8h 40m |
| 2026-07-12 | CAL5828 | HKG → TPE | Jul 12, 23:20 UTC | Jul 13, 00:50 UTC | 1h 30m |
| 2026-07-12 | CAL5827 | TPE → HKG | Jul 12, 19:20 UTC | Jul 12, 21:00 UTC | 1h 40m |
| 2026-07-12 | CAL5141 | - | Jul 12, 12:20 UTC | Jul 12, 12:45 UTC | 25m |
| 2026-07-12 | CAL5141 | - | Jul 12, 10:35 UTC | Jul 12, 11:10 UTC | 35m |
| 2026-07-10 | CAL5141 | - | Jul 10, 23:50 UTC | Jul 11, 13:10 UTC | 13h 20m |
| 2026-07-10 | CAL5142 | KIX → ORD | Jul 10, 08:30 UTC | Jul 10, 20:20 UTC | 11h 50m |
| 2026-07-10 | CAL5142 | TPE → KIX | Jul 10, 04:20 UTC | Jul 10, 06:30 UTC | 2h 10m |
| 2026-07-09 | CAL5345 | - | Jul 9, 12:05 UTC | Jul 10, 00:35 UTC | 12h 30m |
| 2026-07-09 | CAL5345 | - | Jul 9, 04:55 UTC | Jul 9, 09:15 UTC | 4h 20m |
| 2026-07-08 | CAL5346 | - | Jul 8, 22:25 UTC | Jul 9, 02:25 UTC | 4h 0m |
| 2026-07-08 | CAL5346 | TPE → SFO | Jul 8, 09:10 UTC | Jul 8, 20:25 UTC | 11h 15m |
| 2026-07-08 | CAL5137 | - | Jul 8, 06:20 UTC | Jul 8, 06:40 UTC | 20m |
| 2026-07-07 | CAL5137 | - | Jul 7, 17:35 UTC | Jul 8, 05:10 UTC | 11h 35m |
| 2026-07-07 | CAL5138 | - | Jul 7, 03:55 UTC | Jul 7, 14:20 UTC | 10h 25m |
| 2026-07-07 | CAL5138 | - | Jul 7, 02:25 UTC | Jul 7, 02:45 UTC | 20m |
| 2026-07-06 | CAL5836 | HKG → TPE | Jul 6, 22:25 UTC | Jul 6, 23:50 UTC | 1h 25m |
| 2026-07-06 | CAL5835 | - | Jul 6, 19:20 UTC | Jul 6, 19:30 UTC | 10m |
| 2026-07-06 | CAL5835 | - | Jul 6, 18:20 UTC | Jul 6, 18:50 UTC | 30m |
| 2026-07-06 | CAL5335 | ORD → SEA | Jul 6, 15:40 UTC | Jul 6, 16:05 UTC | 25m |
| 2026-07-06 | CAL5335 | ORD → SEA | Jul 6, 04:20 UTC | Jul 6, 14:30 UTC | 10h 10m |
| 2026-07-05 | CAL5335 | ORD → SEA | Jul 5, 21:30 UTC | Jul 6, 01:20 UTC | 3h 50m |
| 2026-07-05 | CAL5336 | ANC → ORD | Jul 5, 13:10 UTC | Jul 5, 18:30 UTC | 5h 20m |
| 2026-07-05 | CAL5336 | ANC → ORD | Jul 5, 03:15 UTC | Jul 5, 11:55 UTC | 8h 40m |
| 2026-07-04 | CAL5345 | SFO → TPE | Jul 4, 11:20 UTC | Jul 4, 23:45 UTC | 12h 25m |
| 2026-07-04 | CAL5345 | SFO → TPE | Jul 4, 03:20 UTC | Jul 4, 07:35 UTC | 4h 15m |
| 2026-07-03 | CAL5346 | SFO → ATL | Jul 3, 21:00 UTC | Jul 4, 01:10 UTC | 4h 10m |
| 2026-07-03 | CAL5346 | - | Jul 3, 09:20 UTC | Jul 3, 19:15 UTC | 9h 55m |
| 2026-07-03 | CAL5346 | - | Jul 3, 07:45 UTC | Jul 3, 08:00 UTC | 15m |
| 2026-07-02 | CAL5522 | FRA → TPE | Jul 2, 14:05 UTC | Jul 3, 03:15 UTC | 13h 10m |
| 2026-07-02 | CAL5663 | - | Jul 2, 02:15 UTC | Jul 2, 10:00 UTC | 7h 45m |
| 2026-07-01 | CAL5663 | TPE → DEL | Jul 1, 17:50 UTC | Jul 1, 23:55 UTC | 6h 5m |
| 2026-07-01 | CAL5834 | - | Jul 1, 12:45 UTC | Jul 1, 14:20 UTC | 1h 35m |
| 2026-07-01 | CAL5833 | - | Jul 1, 10:25 UTC | Jul 1, 10:45 UTC | 20m |
| 2026-07-01 | CAL5833 | - | Jul 1, 09:25 UTC | Jul 1, 09:50 UTC | 25m |
| 2026-06-30 | CAL5838 | - | Jun 30, 14:40 UTC | Jun 30, 15:55 UTC | 1h 15m |
| 2026-06-30 | CAL5837 | - | Jun 30, 11:45 UTC | Jun 30, 12:05 UTC | 20m |
| 2026-06-30 | CAL5837 | - | Jun 30, 10:45 UTC | Jun 30, 11:10 UTC | 25m |
| 2026-06-30 | CAL6658 | - | Jun 30, 05:20 UTC | Jun 30, 08:40 UTC | 3h 20m |
| 2026-06-29 | CAL6657 | - | Jun 29, 23:29 UTC | Jun 30, 02:30 UTC | 3h 1m |
| 2026-06-29 | CAL5141 | KIX → TPE | Jun 29, 12:49 UTC | Jun 29, 15:09 UTC | 2h 20m |
| 2026-06-28 | CAL5141 | - | Jun 28, 22:15 UTC | Jun 29, 11:10 UTC | 12h 55m |
| 2026-06-28 | CAL5142 | KIX → ORD | Jun 28, 07:14 UTC | Jun 28, 19:04 UTC | 11h 50m |
| 2026-06-28 | CAL5142 | TPE → KIX | Jun 28, 02:05 UTC | Jun 28, 04:10 UTC | 2h 5m |
| 2026-06-27 | CAL5826 | HKG → TPE | Jun 27, 18:45 UTC | Jun 27, 20:09 UTC | 1h 25m |
| 2026-06-27 | CAL5825 | - | Jun 27, 16:20 UTC | Jun 27, 16:39 UTC | 20m |
| 2026-06-27 | CAL5825 | - | Jun 27, 15:24 UTC | Jun 27, 15:49 UTC | 25m |
| 2026-06-27 | CAL5838 | HKG → TPE | Jun 27, 11:59 UTC | Jun 27, 13:24 UTC | 1h 25m |
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-18781 page for operator, model, and routing details .