sensors Mode-S transponder
7811F1
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-1491 · BOEING 737-800
- Hex
- 7811F1
- Octal
- 36010761
- Decimal
- 7,868,913
- Country
- CN
- Tail
- B-1491
- Type
- B738
- Flights observed
- 24
- Distinct callsigns
- 19
- Country
- CN
- Last broadcast
- 5h ago
Last known position
Country allocation
The ICAO 24-bit address 7811F1 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 19 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CHH7056 | Hainan Airlines | 3 | 2026-05-02 |
| CHH7116 | Hainan Airlines | 2 | 2026-04-30 |
| CHH7115 | Hainan Airlines | 2 | 2026-05-03 |
| CHH7051 | Hainan Airlines | 2 | 2026-05-06 |
| CHH7488 | Hainan Airlines | 1 | 2026-04-23 |
| CHH7320 | Hainan Airlines | 1 | 2026-04-30 |
| CHH7248 | Hainan Airlines | 1 | 2026-04-26 |
| CHH7234 | Hainan Airlines | 1 | 2026-04-15 |
| CHH7220 | Hainan Airlines | 1 | 2026-04-27 |
| CHH7219 | Hainan Airlines | 1 | 2026-04-27 |
| CHH7178 | Hainan Airlines | 1 | 2026-04-25 |
| CHH7161 | Hainan Airlines | 1 | 2026-04-19 |
| CHH7147 | Hainan Airlines | 1 | 2026-04-26 |
| CHH7120 | Hainan Airlines | 1 | 2026-04-28 |
| CHH7055 | Hainan Airlines | 1 | 2026-05-02 |
| CHH7052 | Hainan Airlines | 1 | 2026-06-03 |
| CHH7042 | Hainan Airlines | 1 | 2026-05-05 |
| CHH7017 | Hainan Airlines | 1 | 2026-06-01 |
| CHH7015 | Hainan Airlines | 1 | 2026-06-02 |
Recent flights last 24
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-03 | CHH7052 | HGH → HAK | Jun 3, 05:55 UTC | Jun 3, 06:15 UTC | 20m |
| 2026-06-02 | CHH7015 | HAK → SZX | Jun 2, 11:40 UTC | Jun 2, 12:00 UTC | 20m |
| 2026-06-01 | CHH7017 | HAK → ZUH | Jun 1, 00:25 UTC | Jun 1, 00:35 UTC | 10m |
| 2026-05-06 | CHH7051 | HAK → HGH | May 6, 13:30 UTC | May 7, 06:35 UTC | 17h 4m |
| 2026-05-06 | CHH7051 | HAK → HGH | May 6, 08:40 UTC | May 7, 06:35 UTC | 21h 54m |
| 2026-05-05 | CHH7042 | HGH → HAK | May 5, 07:35 UTC | May 5, 13:45 UTC | 6h 10m |
| 2026-05-03 | CHH7115 | HAK → NKG | May 3, 14:00 UTC | May 4, 07:15 UTC | 17h 15m |
| 2026-05-03 | CHH7115 | HAK → NKG | May 3, 09:25 UTC | May 4, 07:15 UTC | 21h 50m |
| 2026-05-02 | CHH7056 | HGH → HAK | May 2, 13:45 UTC | May 3, 09:35 UTC | 19h 49m |
| 2026-05-02 | CHH7055 | HAK → HGH | May 2, 08:50 UTC | May 2, 13:55 UTC | 5h 5m |
| 2026-04-30 | CHH7320 | PVG → HAK | Apr 30, 12:40 UTC | May 1, 02:35 UTC | 13h 55m |
| 2026-04-30 | CHH7116 | NKG → HAK | Apr 30, 06:45 UTC | May 1, 02:35 UTC | 19h 50m |
| 2026-04-30 | CHH7116 | NKG → HAK | Apr 30, 02:05 UTC | Apr 30, 12:40 UTC | 10h 35m |
| 2026-04-29 | CHH7056 | HGH → HAK | Apr 29, 15:05 UTC | Apr 30, 12:40 UTC | 21h 35m |
| 2026-04-29 | CHH7056 | HGH → HAK | Apr 29, 10:20 UTC | Apr 30, 07:00 UTC | 20h 39m |
| 2026-04-28 | CHH7120 | PVG → HAK | Apr 28, 05:15 UTC | Apr 28, 11:50 UTC | 6h 35m |
| 2026-04-27 | CHH7220 | PVG → HAK | Apr 27, 14:25 UTC | Apr 28, 11:50 UTC | 21h 25m |
| 2026-04-27 | CHH7219 | HAK → PVG | Apr 27, 09:30 UTC | Apr 28, 05:25 UTC | 19h 55m |
| 2026-04-26 | CHH7248 | TFU → PEK | Apr 26, 06:40 UTC | Apr 26, 06:50 UTC | 10m |
| 2026-04-26 | CHH7147 | PEK → TFU | Apr 26, 00:15 UTC | Apr 26, 00:25 UTC | 10m |
| 2026-04-25 | CHH7178 | HGH → PEK | Apr 25, 11:25 UTC | Apr 25, 11:50 UTC | 25m |
| 2026-04-23 | CHH7488 | CGQ → HGH | Apr 23, 13:45 UTC | Apr 24, 03:25 UTC | 13h 40m |
| 2026-04-19 | CHH7161 | CAN → HGH | Apr 19, 23:25 UTC | Apr 19, 23:35 UTC | 10m |
| 2026-04-15 | CHH7234 | NGB → CAN | Apr 15, 06:35 UTC | Apr 15, 06:45 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-1491 page for operator, model, and routing details .