sensors Mode-S transponder
780B21
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-5775 · BOEING 737-800
- Hex
- 780B21
- Octal
- 36005441
- Decimal
- 7,867,169
- Country
- CN
- Tail
- B-5775
- Type
- B738
- Flights observed
- 64
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 21h ago
Last known position
Country allocation
The ICAO 24-bit address 780B21 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 |
|---|---|---|---|
| CSZ673 | Shenzhen Airlines | 5 | 2026-05-10 |
| CSZ9463 | Shenzhen Airlines | 3 | 2026-05-16 |
| CSZ9097 | Shenzhen Airlines | 3 | 2026-05-09 |
| CSZ674 | Shenzhen Airlines | 3 | 2026-05-10 |
| CSZ9851 | Shenzhen Airlines | 2 | 2026-04-25 |
| CSZ9816 | Shenzhen Airlines | 2 | 2026-05-29 |
| CSZ9521 | Shenzhen Airlines | 2 | 2026-05-22 |
| CSZ9098 | Shenzhen Airlines | 2 | 2026-05-03 |
| CSZ121 | Shenzhen Airlines | 2 | 2026-05-11 |
| CSZ9946 | Shenzhen Airlines | 1 | 2026-04-18 |
| CSZ9919 | Shenzhen Airlines | 1 | 2026-04-27 |
| CSZ9900 | Shenzhen Airlines | 1 | 2026-05-22 |
| CSZ9899 | Shenzhen Airlines | 1 | 2026-05-22 |
| CSZ9895 | Shenzhen Airlines | 1 | 2026-04-28 |
| CSZ9891 | Shenzhen Airlines | 1 | 2026-05-20 |
| CSZ9884 | Shenzhen Airlines | 1 | 2026-05-21 |
| CSZ9858 | Shenzhen Airlines | 1 | 2026-04-19 |
| CSZ9855 | Shenzhen Airlines | 1 | 2026-05-15 |
| CSZ9853 | Shenzhen Airlines | 1 | 2026-04-14 |
| CSZ9846 | Shenzhen Airlines | 1 | 2026-04-14 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | CSZ9807 | SZX → CGO | May 29, 04:45 UTC | May 29, 05:10 UTC | 25m |
| 2026-05-29 | CSZ9816 | SHA → SZX | May 29, 02:50 UTC | May 29, 03:10 UTC | 20m |
| 2026-05-27 | CSZ8538 | ZUH → WUX | May 27, 03:29 UTC | May 27, 03:45 UTC | 15m |
| 2026-05-22 | CSZ9521 | SZX → PVG | May 22, 08:20 UTC | May 22, 08:30 UTC | 10m |
| 2026-05-22 | CSZ9900 | HFE → SZX | May 22, 06:50 UTC | May 22, 07:10 UTC | 20m |
| 2026-05-22 | CSZ9899 | SZX → HFE | May 22, 00:45 UTC | May 22, 00:55 UTC | 10m |
| 2026-05-21 | CSZ9884 | HGH → SZX | May 21, 13:01 UTC | May 21, 13:20 UTC | 20m |
| 2026-05-20 | CSZ9891 | SZX → PVG | May 20, 09:45 UTC | May 20, 09:55 UTC | 10m |
| 2026-05-20 | CSZ9451 | SZX → KMG | May 20, 01:50 UTC | May 20, 02:05 UTC | 15m |
| 2026-05-19 | CSZ8862 | KHN → SZX | May 19, 15:10 UTC | May 19, 15:20 UTC | 10m |
| 2026-05-16 | CSZ9463 | CKG → NKG | May 16, 03:30 UTC | May 16, 03:40 UTC | 10m |
| 2026-05-15 | CSZ9855 | SZX → CKG | May 15, 16:15 UTC | May 15, 16:25 UTC | 10m |
| 2026-05-15 | CSZ9522 | PVG → SZX | May 15, 14:15 UTC | May 15, 14:40 UTC | 25m |
| 2026-05-15 | CSZ9521 | SZX → PVG | May 15, 07:55 UTC | May 15, 08:05 UTC | 10m |
| 2026-05-14 | CSZ8925 | - | May 14, 23:40 UTC | May 14, 23:55 UTC | 15m |
| 2026-05-14 | CSZ9808 | CGO → SZX | May 14, 17:25 UTC | May 14, 18:10 UTC | 45m |
| 2026-05-13 | CSZ9096 | HKG → WUX | May 13, 04:40 UTC | May 13, 05:00 UTC | 20m |
| 2026-05-13 | CSZ9095 | WUX → HKG | May 13, 02:40 UTC | May 13, 02:55 UTC | 15m |
| 2026-05-11 | CSZ121 | CAN → HAN | May 11, 04:10 UTC | May 11, 04:20 UTC | 10m |
| 2026-05-10 | CSZ674 | KIX → WUX | May 10, 04:25 UTC | May 10, 05:14 UTC | 50m |
| 2026-05-10 | CSZ673 | WUX → KIX | May 10, 02:20 UTC | May 10, 03:04 UTC | 45m |
| 2026-05-09 | CSZ673 | WUX → KIX | May 9, 06:25 UTC | May 10, 03:04 UTC | 20h 40m |
| 2026-05-09 | CSZ673 | WUX → KIX | May 9, 05:25 UTC | May 10, 03:04 UTC | 21h 40m |
| 2026-05-09 | CSZ9097 | SZX → KIX | May 9, 03:25 UTC | May 9, 03:45 UTC | 20m |
| 2026-05-08 | CSZ674 | KIX → WUX | May 8, 04:19 UTC | May 9, 03:45 UTC | 23h 25m |
| 2026-05-08 | CSZ673 | WUX → KIX | May 8, 01:59 UTC | May 8, 02:44 UTC | 45m |
| 2026-05-07 | CSZ9155 | PEK → WUX | May 7, 08:45 UTC | May 7, 08:55 UTC | 10m |
| 2026-05-06 | CSZ674 | KIX → WUX | May 6, 04:25 UTC | May 6, 05:10 UTC | 45m |
| 2026-05-06 | CSZ673 | WUX → KIX | May 6, 02:05 UTC | May 6, 02:30 UTC | 25m |
| 2026-05-05 | CSZ9157 | PEK → WUX | May 5, 03:10 UTC | May 5, 03:20 UTC | 10m |
| 2026-05-04 | CSZ9816 | SHA → SZX | May 4, 02:15 UTC | May 4, 02:35 UTC | 20m |
| 2026-05-03 | CSZ9098 | KIX → SZX | May 3, 05:25 UTC | May 3, 06:30 UTC | 1h 5m |
| 2026-05-03 | CSZ9097 | SZX → KIX | May 3, 03:40 UTC | May 3, 04:05 UTC | 25m |
| 2026-05-01 | CSZ121 | CAN → HAN | May 1, 03:50 UTC | May 1, 04:10 UTC | 20m |
| 2026-04-30 | CSZ9098 | KIX → SZX | Apr 30, 05:25 UTC | Apr 30, 05:45 UTC | 20m |
| 2026-04-30 | CSZ9097 | SZX → KIX | Apr 30, 03:35 UTC | Apr 30, 03:50 UTC | 15m |
| 2026-04-29 | CSZ9815 | SZX → SHA | Apr 29, 16:45 UTC | Apr 29, 16:55 UTC | 10m |
| 2026-04-28 | CSZ9895 | SZX → KWE | Apr 28, 15:40 UTC | Apr 28, 15:50 UTC | 10m |
| 2026-04-28 | CSZ9526 | PVG → SZX | Apr 28, 13:55 UTC | Apr 28, 14:05 UTC | 10m |
| 2026-04-28 | CSZ9329 | CGO → SZX | Apr 28, 01:10 UTC | Apr 28, 01:20 UTC | 10m |
| 2026-04-27 | CSZ9919 | SZX → TAO | Apr 27, 07:45 UTC | Apr 27, 07:55 UTC | 10m |
| 2026-04-27 | CSZ8926 | - | Apr 27, 06:15 UTC | Apr 27, 06:25 UTC | 10m |
| 2026-04-25 | CSZ9851 | SZX → PEK | Apr 25, 10:55 UTC | Apr 25, 11:05 UTC | 10m |
| 2026-04-25 | CSZ9806 | WUX → SZX | Apr 25, 09:10 UTC | Apr 25, 09:30 UTC | 20m |
| 2026-04-24 | CSZ9366 | FOC → NNG | Apr 24, 04:00 UTC | Apr 24, 04:25 UTC | 25m |
| 2026-04-24 | CSZ9365 | NNG → FOC | Apr 24, 00:15 UTC | Apr 24, 00:30 UTC | 15m |
| 2026-04-22 | CSZ9463 | CKG → NKG | Apr 22, 03:30 UTC | Apr 22, 03:45 UTC | 15m |
| 2026-04-21 | CSZ9130 | HET → SZX | Apr 21, 10:40 UTC | Apr 21, 10:50 UTC | 10m |
| 2026-04-21 | CSZ9129 | SZX → HET | Apr 21, 03:25 UTC | Apr 21, 03:35 UTC | 10m |
| 2026-04-20 | CSZ8662 | NTG → SZX | Apr 20, 15:40 UTC | Apr 20, 16:00 UTC | 20m |
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-5775 page for operator, model, and routing details .