sensors Mode-S transponder
7821B7
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-32K2 · AIRBUS A-321neo
- Hex
- 7821B7
- Octal
- 36020667
- Decimal
- 7,872,951
- Country
- CN
- Tail
- B-32K2
- Type
- A21N
- Flights observed
- 89
- Distinct callsigns
- 18
- Country
- CN
- Last broadcast
- 8h ago
Last known position
Country allocation
The ICAO 24-bit address 7821B7 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 18 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CSN627 | China Southern Airlines | 24 | 2026-05-26 |
| CSN628 | China Southern Airlines | 12 | 2026-05-27 |
| CSN6367 | China Southern Airlines | 11 | 2026-05-19 |
| CSN6309 | China Southern Airlines | 7 | 2026-05-20 |
| CSN681 | China Southern Airlines | 5 | 2026-05-30 |
| CSN682 | China Southern Airlines | 4 | 2026-05-30 |
| CSN6312 | China Southern Airlines | 4 | 2026-05-01 |
| CSN6310 | China Southern Airlines | 4 | 2026-05-05 |
| CSN6507 | China Southern Airlines | 3 | 2026-05-15 |
| CSN6503 | China Southern Airlines | 3 | 2026-05-20 |
| CSN6311 | China Southern Airlines | 3 | 2026-04-30 |
| CSN6368 | China Southern Airlines | 2 | 2026-05-04 |
| CSN6519 | China Southern Airlines | 1 | 2026-05-22 |
| CSN6501 | China Southern Airlines | 1 | 2026-05-28 |
| CSN6347 | China Southern Airlines | 1 | 2026-05-08 |
| CSN3602 | China Southern Airlines | 1 | 2026-05-29 |
| CSN3576 | China Southern Airlines | 1 | 2026-05-18 |
| CSN3568 | China Southern Airlines | 1 | 2026-05-17 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | CSN682 | ICN → SHE | May 30, 04:05 UTC | May 30, 08:10 UTC | 4h 5m |
| 2026-05-30 | CSN681 | SHE → ICN | May 30, 02:06 UTC | May 30, 02:30 UTC | 24m |
| 2026-05-29 | CSN3602 | SHE → CAN | May 29, 01:10 UTC | May 29, 17:10 UTC | 16h 1m |
| 2026-05-28 | CSN6501 | SHE → PVG | May 28, 07:30 UTC | May 29, 01:20 UTC | 17h 50m |
| 2026-05-28 | CSN682 | ICN → SHE | May 28, 04:05 UTC | May 29, 01:20 UTC | 21h 15m |
| 2026-05-28 | CSN681 | SHE → ICN | May 28, 01:50 UTC | May 28, 02:15 UTC | 25m |
| 2026-05-27 | CSN628 | NRT → SHE | May 27, 04:59 UTC | May 27, 10:10 UTC | 5h 11m |
| 2026-05-26 | CSN627 | SHE → NRT | May 26, 08:10 UTC | May 27, 03:04 UTC | 18h 55m |
| 2026-05-26 | CSN682 | ICN → SHE | May 26, 04:24 UTC | May 26, 08:10 UTC | 3h 45m |
| 2026-05-26 | CSN681 | SHE → ICN | May 26, 01:55 UTC | May 26, 02:19 UTC | 25m |
| 2026-05-25 | CSN628 | NRT → SHE | May 25, 05:05 UTC | May 25, 10:10 UTC | 5h 5m |
| 2026-05-24 | CSN627 | SHE → NRT | May 24, 13:00 UTC | May 25, 03:00 UTC | 14h 0m |
| 2026-05-24 | CSN627 | SHE → NRT | May 24, 05:10 UTC | May 25, 03:00 UTC | 21h 50m |
| 2026-05-24 | CSN627 | SHE → NRT | May 24, 02:30 UTC | May 24, 03:30 UTC | 1h 0m |
| 2026-05-22 | CSN6519 | SHE → PVG | May 22, 09:30 UTC | May 23, 01:05 UTC | 15h 35m |
| 2026-05-22 | CSN628 | NRT → SHE | May 22, 05:10 UTC | May 23, 01:05 UTC | 19h 55m |
| 2026-05-22 | CSN627 | SHE → NRT | May 22, 02:20 UTC | May 22, 03:10 UTC | 50m |
| 2026-05-20 | CSN6503 | SHE → PVG | May 20, 12:35 UTC | May 21, 01:00 UTC | 12h 25m |
| 2026-05-20 | CSN6309 | SHE → SZX | May 20, 07:25 UTC | May 20, 07:50 UTC | 25m |
| 2026-05-19 | CSN6309 | SHE → SZX | May 19, 09:55 UTC | May 20, 05:15 UTC | 19h 21m |
| 2026-05-19 | CSN6367 | SHE → CAN | May 19, 03:10 UTC | May 19, 13:55 UTC | 10h 45m |
| 2026-05-18 | CSN3576 | SHA → SZX | May 18, 04:05 UTC | May 18, 05:05 UTC | 1h 0m |
| 2026-05-17 | CSN3568 | SZX → SHA | May 17, 22:45 UTC | May 17, 22:55 UTC | 10m |
| 2026-05-17 | CSN628 | NRT → SHE | May 17, 05:10 UTC | May 17, 11:45 UTC | 6h 35m |
| 2026-05-16 | CSN627 | SHE → NRT | May 16, 07:55 UTC | May 17, 03:10 UTC | 19h 15m |
| 2026-05-16 | CSN627 | SHE → NRT | May 16, 07:35 UTC | May 17, 03:10 UTC | 19h 35m |
| 2026-05-16 | CSN627 | SHE → NRT | May 16, 04:00 UTC | May 17, 03:10 UTC | 23h 10m |
| 2026-05-16 | CSN681 | SHE → ICN | May 16, 02:00 UTC | May 16, 02:15 UTC | 15m |
| 2026-05-15 | CSN6507 | SHE → PVG | May 15, 11:15 UTC | May 16, 01:15 UTC | 13h 59m |
| 2026-05-15 | CSN628 | NRT → SHE | May 15, 05:00 UTC | May 16, 01:15 UTC | 20h 14m |
| 2026-05-14 | CSN627 | SHE → NRT | May 14, 07:55 UTC | May 15, 03:25 UTC | 19h 30m |
| 2026-05-14 | CSN627 | SHE → NRT | May 14, 07:25 UTC | May 15, 03:25 UTC | 20h 0m |
| 2026-05-14 | CSN627 | SHE → NRT | May 14, 04:05 UTC | May 15, 03:25 UTC | 23h 20m |
| 2026-05-14 | CSN681 | SHE → ICN | May 14, 02:00 UTC | May 14, 02:20 UTC | 20m |
| 2026-05-13 | CSN628 | NRT → SHE | May 13, 05:05 UTC | May 13, 09:50 UTC | 4h 45m |
| 2026-05-13 | CSN627 | SHE → NRT | May 13, 02:35 UTC | May 13, 03:25 UTC | 50m |
| 2026-05-11 | CSN628 | NRT → SHE | May 11, 05:00 UTC | May 11, 10:15 UTC | 5h 15m |
| 2026-05-11 | CSN627 | SHE → NRT | May 11, 02:30 UTC | May 11, 03:20 UTC | 50m |
| 2026-05-10 | CSN627 | SHE → NRT | May 10, 05:04 UTC | May 11, 03:20 UTC | 22h 15m |
| 2026-05-09 | CSN627 | SHE → NRT | May 9, 11:30 UTC | May 10, 03:14 UTC | 15h 45m |
| 2026-05-09 | CSN627 | SHE → NRT | May 9, 04:30 UTC | May 10, 03:14 UTC | 22h 45m |
| 2026-05-08 | CSN6347 | SHE → CAN | May 8, 12:49 UTC | May 9, 11:30 UTC | 22h 40m |
| 2026-05-08 | CSN6367 | SHE → CAN | May 8, 03:04 UTC | May 8, 13:00 UTC | 9h 55m |
| 2026-05-07 | CSN6367 | SHE → CAN | May 7, 07:55 UTC | May 8, 03:30 UTC | 19h 34m |
| 2026-05-07 | CSN6367 | SHE → CAN | May 7, 07:25 UTC | May 8, 03:30 UTC | 20h 5m |
| 2026-05-07 | CSN6367 | SHE → CAN | May 7, 04:20 UTC | May 8, 03:30 UTC | 23h 10m |
| 2026-05-06 | - | - | May 6, 10:01 UTC | May 7, 01:25 UTC | 15h 24m |
| 2026-05-06 | CSN628 | NRT → SHE | May 6, 05:05 UTC | May 7, 01:25 UTC | 20h 19m |
| 2026-05-05 | CSN627 | SHE → NRT | May 5, 12:20 UTC | May 6, 03:10 UTC | 14h 50m |
| 2026-05-05 | CSN6310 | SZX → SHE | May 5, 09:45 UTC | May 5, 09:55 UTC | 10m |
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-32K2 page for operator, model, and routing details .