sensors Mode-S transponder
7821BC
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-32K5 · AIRBUS A-320neo
- Hex
- 7821BC
- Octal
- 36020674
- Decimal
- 7,872,956
- Country
- CN
- Tail
- B-32K5
- Type
- A20N
- Flights observed
- 38
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 9h ago
Last known position
Country allocation
The ICAO 24-bit address 7821BC 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 |
|---|---|---|---|
| CHH7038 | Hainan Airlines | 7 | 2026-05-17 |
| CHH7090 | Hainan Airlines | 3 | 2026-05-08 |
| CHH7008 | Hainan Airlines | 3 | 2026-06-03 |
| CHH7688 | Hainan Airlines | 2 | 2026-05-31 |
| CHH7037 | Hainan Airlines | 2 | 2026-05-27 |
| CHH7034 | Hainan Airlines | 2 | 2026-05-12 |
| CHH7018 | Hainan Airlines | 2 | 2026-05-28 |
| CHH7004 | Hainan Airlines | 2 | 2026-06-04 |
| CHH7940 | Hainan Airlines | 1 | 2026-05-05 |
| CHH7939 | Hainan Airlines | 1 | 2026-05-04 |
| CHH7285 | Hainan Airlines | 1 | 2026-06-05 |
| CHH722 | Hainan Airlines | 1 | 2026-05-11 |
| CHH7214 | Hainan Airlines | 1 | 2026-04-30 |
| CHH721 | Hainan Airlines | 1 | 2026-05-11 |
| CHH7205 | Hainan Airlines | 1 | 2026-04-21 |
| CHH7120 | Hainan Airlines | 1 | 2026-05-24 |
| CHH7116 | Hainan Airlines | 1 | 2026-05-30 |
| CHH7115 | Hainan Airlines | 1 | 2026-05-29 |
| CHH7050 | - | 1 | 2026-05-28 |
| CHH7049 | Hainan Airlines | 1 | 2026-05-28 |
Recent flights last 38
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-05 | CHH7285 | CAN → CGO | Jun 5, 09:25 UTC | Jun 5, 09:35 UTC | 10m |
| 2026-06-04 | CHH7004 | CAN → HAK | Jun 4, 00:00 UTC | Jun 4, 00:15 UTC | 15m |
| 2026-06-03 | CHH7008 | CAN → HAK | Jun 3, 05:25 UTC | Jun 3, 05:50 UTC | 25m |
| 2026-06-03 | CHH7004 | CAN → HAK | Jun 3, 00:00 UTC | Jun 3, 00:15 UTC | 15m |
| 2026-05-31 | CHH7688 | NGB → HAK | May 31, 09:40 UTC | May 31, 09:55 UTC | 15m |
| 2026-05-30 | CHH7010 | CAN → HAK | May 30, 12:50 UTC | May 30, 13:10 UTC | 20m |
| 2026-05-30 | CHH7009 | HAK → CAN | May 30, 10:35 UTC | May 30, 11:05 UTC | 30m |
| 2026-05-30 | CHH7116 | NKG → HAK | May 30, 01:45 UTC | May 30, 07:15 UTC | 5h 30m |
| 2026-05-29 | CHH7115 | HAK → NKG | May 29, 01:35 UTC | May 29, 06:55 UTC | 5h 20m |
| 2026-05-28 | CHH7050 | - | May 28, 14:55 UTC | May 28, 15:05 UTC | 10m |
| 2026-05-28 | CHH7049 | HAK → KWE | May 28, 04:35 UTC | May 28, 04:50 UTC | 15m |
| 2026-05-28 | CHH7018 | ZUH → HAK | May 28, 02:05 UTC | May 28, 02:15 UTC | 10m |
| 2026-05-27 | CHH7037 | HAK → HFE | May 27, 10:10 UTC | May 27, 14:15 UTC | 4h 5m |
| 2026-05-24 | CHH7120 | PVG → HAK | May 24, 06:05 UTC | May 24, 11:50 UTC | 5h 45m |
| 2026-05-22 | CHH7007 | HAK → CAN | May 22, 08:30 UTC | May 22, 08:45 UTC | 15m |
| 2026-05-22 | CHH7008 | CAN → HAK | May 22, 05:45 UTC | May 22, 06:00 UTC | 15m |
| 2026-05-19 | CHH7688 | NGB → HAK | May 19, 09:55 UTC | May 19, 10:15 UTC | 20m |
| 2026-05-17 | CHH7038 | HFE → HAK | May 17, 10:25 UTC | May 17, 14:30 UTC | 4h 5m |
| 2026-05-15 | CHH7038 | HFE → HAK | May 15, 14:45 UTC | May 15, 15:05 UTC | 19m |
| 2026-05-13 | CHH7038 | HFE → HAK | May 13, 10:10 UTC | May 13, 14:51 UTC | 4h 40m |
| 2026-05-12 | CHH7038 | HFE → HAK | May 12, 10:05 UTC | May 12, 14:40 UTC | 4h 35m |
| 2026-05-12 | CHH7034 | CGO → HAK | May 12, 07:00 UTC | May 12, 07:25 UTC | 25m |
| 2026-05-11 | CHH722 | BKK → HAK | May 11, 12:20 UTC | May 12, 07:25 UTC | 19h 6m |
| 2026-05-11 | CHH721 | HAK → BKK | May 11, 10:00 UTC | May 11, 10:50 UTC | 50m |
| 2026-05-09 | CHH7018 | ZUH → HAK | May 9, 02:30 UTC | May 9, 02:45 UTC | 15m |
| 2026-05-08 | CHH7090 | NKG → HAK | May 8, 02:14 UTC | May 8, 15:15 UTC | 13h 0m |
| 2026-05-06 | CHH7038 | HFE → HAK | May 6, 09:55 UTC | May 6, 14:40 UTC | 4h 45m |
| 2026-05-05 | CHH7940 | BKK → HAK | May 5, 04:20 UTC | May 5, 04:50 UTC | 30m |
| 2026-05-04 | CHH7939 | HAK → BKK | May 4, 09:05 UTC | May 5, 02:25 UTC | 17h 21m |
| 2026-04-30 | CHH7214 | NKG → CAN | Apr 30, 14:55 UTC | Apr 30, 15:15 UTC | 20m |
| 2026-04-29 | CHH7008 | CAN → HAK | Apr 29, 08:55 UTC | Apr 29, 09:10 UTC | 16m |
| 2026-04-26 | CHH7090 | NKG → HAK | Apr 26, 11:00 UTC | Apr 26, 15:05 UTC | 4h 5m |
| 2026-04-24 | CHH7038 | HFE → HAK | Apr 24, 16:30 UTC | Apr 24, 16:55 UTC | 25m |
| 2026-04-22 | CHH7090 | NKG → HAK | Apr 22, 11:00 UTC | Apr 22, 15:10 UTC | 4h 10m |
| 2026-04-21 | CHH7205 | CAN → TNA | Apr 21, 11:00 UTC | Apr 21, 11:10 UTC | 10m |
| 2026-04-16 | CHH7037 | HAK → HFE | Apr 16, 10:40 UTC | Apr 16, 10:49 UTC | 10m |
| 2026-04-14 | CHH7038 | - | Apr 14, 14:25 UTC | Apr 14, 14:45 UTC | 20m |
| 2026-04-14 | CHH7034 | - | Apr 14, 07:10 UTC | Apr 14, 07:30 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-32K5 page for operator, model, and routing details .