sensors Mode-S transponder
78921A
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-LXH · AIRBUS A-350-1000
- Hex
- 78921A
- Octal
- 36111032
- Decimal
- 7,901,722
- Country
- CN
- Tail
- B-LXH
- Type
- A35K
- Flights observed
- 100
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 33m ago
Last known position
Country allocation
The ICAO 24-bit address 78921A falls within the block assigned to China (CN) by ICAO Annex 10, Volume III. Every aircraft registered in China 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 |
|---|---|---|---|
| CPA826 | Cathay Pacific | 15 | 2026-04-18 |
| CPA257 | Cathay Pacific | 10 | 2026-05-21 |
| CPA238 | Cathay Pacific | 9 | 2026-05-22 |
| CPA875 | Cathay Pacific | 8 | 2026-05-17 |
| CPA261 | Cathay Pacific | 8 | 2026-05-24 |
| CPA595 | Cathay Pacific | 7 | 2026-05-24 |
| CPA876 | Cathay Pacific | 5 | 2026-05-16 |
| CPA843 | Cathay Pacific | 4 | 2026-05-23 |
| CPA840 | Cathay Pacific | 4 | 2026-05-22 |
| CPA828 | Cathay Pacific | 4 | 2026-05-09 |
| CPA596 | Cathay Pacific | 4 | 2026-05-24 |
| CPA260 | Cathay Pacific | 4 | 2026-05-25 |
| CPA829 | Cathay Pacific | 3 | 2026-04-18 |
| CPA806 | Cathay Pacific | 3 | 2026-05-04 |
| CPA812 | Cathay Pacific | 2 | 2026-05-12 |
| CPA811 | Cathay Pacific | 2 | 2026-05-13 |
| CPA805 | Cathay Pacific | 2 | 2026-05-09 |
| CPA801 | Cathay Pacific | 2 | 2026-05-04 |
| CPA271 | Cathay Pacific | 2 | 2026-05-18 |
| CPA368 | Cathay Pacific | 1 | 2026-05-30 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | CPA368 | HKG → PVG | May 30, 02:00 UTC | May 30, 02:15 UTC | 15m |
| 2026-05-25 | CPA260 | CDG → HKG | May 25, 10:50 UTC | May 25, 22:40 UTC | 11h 50m |
| 2026-05-24 | CPA261 | HKG → CDG | May 24, 21:40 UTC | May 25, 05:25 UTC | 7h 45m |
| 2026-05-24 | CPA261 | HKG → CDG | May 24, 16:35 UTC | May 24, 16:55 UTC | 20m |
| 2026-05-24 | CPA595 | KIX → HKG | May 24, 09:50 UTC | May 24, 13:00 UTC | 3h 10m |
| 2026-05-24 | CPA596 | HKG → KIX | May 24, 00:30 UTC | May 24, 03:35 UTC | 3h 5m |
| 2026-05-23 | CPA843 | JFK → HKG | May 23, 10:05 UTC | May 23, 21:15 UTC | 11h 10m |
| 2026-05-23 | CPA843 | JFK → HKG | May 23, 06:10 UTC | May 23, 07:30 UTC | 1h 20m |
| 2026-05-22 | CPA840 | HKG → JFK | May 22, 10:05 UTC | May 23, 00:55 UTC | 14h 50m |
| 2026-05-22 | CPA238 | LHR → HKG | May 22, 04:05 UTC | May 22, 04:40 UTC | 35m |
| 2026-05-21 | CPA238 | LHR → HKG | May 21, 16:40 UTC | May 21, 21:15 UTC | 4h 35m |
| 2026-05-21 | CPA257 | HKG → LHR | May 21, 09:30 UTC | May 21, 14:25 UTC | 4h 55m |
| 2026-05-21 | CPA257 | HKG → LHR | May 21, 01:00 UTC | May 21, 01:20 UTC | 20m |
| 2026-05-20 | CPA843 | JFK → HKG | May 20, 06:15 UTC | May 20, 21:30 UTC | 15h 15m |
| 2026-05-19 | CPA840 | HKG → JFK | May 19, 09:00 UTC | May 19, 23:55 UTC | 14h 55m |
| 2026-05-18 | CPA270 | AMS → HKG | May 18, 14:05 UTC | May 19, 01:40 UTC | 11h 34m |
| 2026-05-18 | CPA271 | HKG → AMS | May 18, 07:15 UTC | May 18, 12:00 UTC | 4h 45m |
| 2026-05-17 | CPA271 | HKG → AMS | May 17, 22:40 UTC | May 17, 23:00 UTC | 20m |
| 2026-05-17 | CPA875 | DFW → HKG | May 17, 05:00 UTC | May 17, 20:25 UTC | 15h 25m |
| 2026-05-16 | CPA876 | HKG → DFW | May 16, 08:41 UTC | May 16, 22:40 UTC | 14h 0m |
| 2026-05-15 | CPA238 | LHR → HKG | May 15, 16:40 UTC | May 16, 04:20 UTC | 11h 40m |
| 2026-05-15 | CPA257 | HKG → LHR | May 15, 09:50 UTC | May 15, 14:40 UTC | 4h 50m |
| 2026-05-15 | CPA257 | HKG → LHR | May 15, 01:40 UTC | May 15, 02:00 UTC | 20m |
| 2026-05-14 | CPA595 | KIX → HKG | May 14, 13:05 UTC | May 14, 13:25 UTC | 20m |
| 2026-05-14 | CPA595 | KIX → HKG | May 14, 09:55 UTC | May 14, 12:30 UTC | 2h 35m |
| 2026-05-14 | CPA596 | HKG → KIX | May 14, 00:50 UTC | May 14, 03:55 UTC | 3h 5m |
| 2026-05-13 | CPA811 | BOS → HKG | May 13, 05:55 UTC | May 13, 20:40 UTC | 14h 45m |
| 2026-05-12 | CPA812 | HKG → BOS | May 12, 11:45 UTC | May 13, 02:45 UTC | 15h 0m |
| 2026-05-11 | CPA260 | CDG → HKG | May 11, 10:50 UTC | May 11, 22:35 UTC | 11h 45m |
| 2026-05-11 | CPA261 | HKG → CDG | May 11, 00:25 UTC | May 11, 05:40 UTC | 5h 15m |
| 2026-05-10 | CPA261 | HKG → CDG | May 10, 16:25 UTC | May 10, 16:44 UTC | 20m |
| 2026-05-09 | CPA805 | YYZ → HKG | May 9, 20:15 UTC | May 10, 10:55 UTC | 14h 40m |
| 2026-05-09 | CPA828 | HKG → YYZ | May 9, 04:50 UTC | May 9, 17:55 UTC | 13h 5m |
| 2026-05-09 | CPA828 | HKG → YYZ | May 9, 04:05 UTC | May 9, 04:15 UTC | 10m |
| 2026-05-08 | CPA595 | KIX → HKG | May 8, 13:10 UTC | May 8, 13:30 UTC | 20m |
| 2026-05-08 | CPA595 | KIX → HKG | May 8, 09:59 UTC | May 8, 12:39 UTC | 2h 40m |
| 2026-05-08 | CPA596 | HKG → KIX | May 8, 00:40 UTC | May 8, 03:44 UTC | 3h 5m |
| 2026-05-06 | CPA260 | CDG → HKG | May 6, 10:50 UTC | May 6, 22:25 UTC | 11h 34m |
| 2026-05-06 | CPA261 | HKG → CDG | May 6, 01:05 UTC | May 6, 05:50 UTC | 4h 45m |
| 2026-05-05 | CPA261 | HKG → CDG | May 5, 16:40 UTC | May 5, 17:00 UTC | 20m |
| 2026-05-04 | CPA801 | ORD → HKG | May 4, 21:55 UTC | May 5, 12:20 UTC | 14h 25m |
| 2026-05-04 | CPA806 | HKG → ORD | May 4, 04:50 UTC | May 4, 18:20 UTC | 13h 30m |
| 2026-05-03 | CPA875 | DFW → HKG | May 3, 04:25 UTC | May 3, 21:00 UTC | 16h 35m |
| 2026-05-02 | CPA876 | HKG → DFW | May 2, 09:15 UTC | May 2, 22:35 UTC | 13h 20m |
| 2026-05-02 | CPA876 | HKG → DFW | May 2, 08:25 UTC | May 2, 08:40 UTC | 15m |
| 2026-05-01 | CPA260 | CDG → HKG | May 1, 10:40 UTC | May 1, 22:15 UTC | 11h 35m |
| 2026-05-01 | CPA261 | HKG → CDG | May 1, 00:55 UTC | May 1, 05:45 UTC | 4h 50m |
| 2026-04-30 | CPA261 | HKG → CDG | Apr 30, 16:35 UTC | Apr 30, 16:50 UTC | 15m |
| 2026-04-29 | CPA805 | YYZ → HKG | Apr 29, 22:25 UTC | Apr 30, 12:50 UTC | 14h 24m |
| 2026-04-29 | CPA828 | HKG → YYZ | Apr 29, 04:49 UTC | Apr 29, 18:10 UTC | 13h 21m |
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-LXH page for operator, model, and routing details .