sensors Mode-S transponder
781BDB
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-220Y · BOEING 737-800
- Hex
- 781BDB
- Octal
- 36015733
- Decimal
- 7,871,451
- Country
- CN
- Tail
- B-220Y
- Type
- B738
- Flights observed
- 68
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 18h ago
Last known position
Country allocation
The ICAO 24-bit address 781BDB 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 |
|---|---|---|---|
| JYH1211 | - | 11 | 2026-06-19 |
| JYH1207 | - | 10 | 2026-06-19 |
| JYH1212 | - | 7 | 2026-06-19 |
| JYH1041 | - | 7 | 2026-06-25 |
| JYH1208 | 9 Air | 5 | 2026-05-14 |
| JYH1217 | 9 Air | 4 | 2026-06-12 |
| JYH1278 | - | 3 | 2026-07-08 |
| JYH1233 | 9 Air | 3 | 2026-05-13 |
| JYH1231 | 9 Air | 3 | 2026-05-04 |
| JYH1234 | 9 Air | 2 | 2026-05-06 |
| JYH1218 | 9 Air | 2 | 2026-06-13 |
| JYH1574 | - | 1 | 2026-07-17 |
| JYH1343 | - | 1 | 2026-04-14 |
| JYH1298 | 9 Air | 1 | 2026-05-22 |
| JYH1277 | 9 Air | 1 | 2026-04-17 |
| JYH1266 | - | 1 | 2026-07-05 |
| JYH1265 | - | 1 | 2026-07-05 |
| JYH1232 | 9 Air | 1 | 2026-05-18 |
| JYH1216 | 9 Air | 1 | 2026-06-20 |
| JYH1138 | - | 1 | 2026-07-13 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-17 | JYH1574 | - | Jul 17, 11:45 UTC | Jul 17, 11:55 UTC | 10m |
| 2026-07-13 | JYH1138 | - | Jul 13, 04:15 UTC | Jul 13, 08:55 UTC | 4h 40m |
| 2026-07-08 | JYH1278 | - | Jul 8, 15:40 UTC | Jul 8, 23:50 UTC | 8h 10m |
| 2026-07-05 | JYH1266 | - | Jul 5, 17:45 UTC | Jul 6, 09:40 UTC | 15h 55m |
| 2026-07-05 | JYH1265 | - | Jul 5, 14:15 UTC | Jul 5, 16:30 UTC | 2h 15m |
| 2026-07-03 | JYH1278 | - | Jul 3, 15:00 UTC | Jul 3, 19:10 UTC | 4h 10m |
| 2026-07-02 | JYH1026 | - | Jul 2, 02:20 UTC | Jul 2, 02:45 UTC | 25m |
| 2026-06-25 | JYH1041 | - | Jun 25, 23:30 UTC | Jun 25, 23:55 UTC | 25m |
| 2026-06-25 | JYH1041 | - | Jun 25, 00:49 UTC | Jun 25, 23:55 UTC | 23h 5m |
| 2026-06-25 | JYH1041 | - | Jun 25, 00:14 UTC | Jun 25, 01:19 UTC | 1h 5m |
| 2026-06-22 | JYH1041 | - | Jun 22, 23:35 UTC | Jun 23, 15:40 UTC | 16h 5m |
| 2026-06-21 | - | - | Jun 21, 07:09 UTC | Jun 21, 07:25 UTC | 15m |
| 2026-06-20 | JYH1216 | KCH → KWE | Jun 20, 11:44 UTC | Jun 21, 02:04 UTC | 14h 20m |
| 2026-06-19 | JYH1207 | - | Jun 19, 14:49 UTC | Jun 20, 09:59 UTC | 19h 10m |
| 2026-06-19 | JYH1212 | - | Jun 19, 14:15 UTC | Jun 20, 09:59 UTC | 19h 45m |
| 2026-06-19 | JYH1212 | - | Jun 19, 11:45 UTC | Jun 19, 14:49 UTC | 3h 5m |
| 2026-06-19 | JYH1211 | - | Jun 19, 09:49 UTC | Jun 19, 10:14 UTC | 25m |
| 2026-06-18 | JYH1211 | - | Jun 18, 12:50 UTC | Jun 19, 07:49 UTC | 18h 59m |
| 2026-06-18 | JYH1211 | - | Jun 18, 12:25 UTC | Jun 19, 07:49 UTC | 19h 24m |
| 2026-06-18 | JYH1207 | - | Jun 18, 09:50 UTC | Jun 18, 11:00 UTC | 1h 10m |
| 2026-06-17 | JYH1207 | - | Jun 17, 13:50 UTC | Jun 18, 11:00 UTC | 21h 10m |
| 2026-06-17 | JYH1212 | - | Jun 17, 11:30 UTC | Jun 18, 10:45 UTC | 23h 15m |
| 2026-06-17 | JYH1211 | - | Jun 17, 09:45 UTC | Jun 17, 10:00 UTC | 15m |
| 2026-06-17 | JYH1211 | - | Jun 17, 07:10 UTC | Jun 17, 07:40 UTC | 30m |
| 2026-06-16 | JYH1211 | - | Jun 16, 11:40 UTC | Jun 17, 07:40 UTC | 20h 1m |
| 2026-06-16 | JYH1207 | - | Jun 16, 09:30 UTC | Jun 16, 10:04 UTC | 35m |
| 2026-06-13 | JYH1218 | BKI → KWE | Jun 13, 11:10 UTC | Jun 13, 13:40 UTC | 2h 30m |
| 2026-06-12 | JYH1217 | KWE → BKI | Jun 12, 14:50 UTC | Jun 13, 09:55 UTC | 19h 4m |
| 2026-06-12 | JYH1217 | KWE → BKI | Jun 12, 14:35 UTC | Jun 13, 09:55 UTC | 19h 19m |
| 2026-06-12 | JYH1217 | KWE → BKI | Jun 12, 12:05 UTC | Jun 13, 09:55 UTC | 21h 49m |
| 2026-06-12 | JYH1211 | KWE → KUL | Jun 12, 07:20 UTC | Jun 12, 10:20 UTC | 3h 0m |
| 2026-06-07 | JYH1041 | CAN → JHG | Jun 7, 23:30 UTC | Jun 7, 23:40 UTC | 10m |
| 2026-06-03 | JYH1041 | CAN → JHG | Jun 3, 23:45 UTC | Jun 4, 00:25 UTC | 40m |
| 2026-06-02 | JYH1041 | CAN → JHG | Jun 2, 23:05 UTC | Jun 2, 23:45 UTC | 40m |
| 2026-05-22 | JYH1298 | PEN → HAK | May 22, 19:55 UTC | May 23, 00:40 UTC | 4h 45m |
| 2026-05-20 | JYH1212 | KUL → KWE | May 20, 11:45 UTC | May 20, 12:00 UTC | 15m |
| 2026-05-18 | JYH1232 | VTE → NGB | May 18, 10:25 UTC | May 18, 10:35 UTC | 10m |
| 2026-05-17 | JYH1212 | KUL → KWE | May 17, 11:35 UTC | May 17, 11:45 UTC | 10m |
| 2026-05-17 | JYH1211 | KWE → KUL | May 17, 09:45 UTC | May 17, 10:05 UTC | 20m |
| 2026-05-16 | JYH1218 | BKI → KWE | May 16, 11:25 UTC | May 16, 14:01 UTC | 2h 35m |
| 2026-05-16 | JYH1217 | KWE → BKI | May 16, 07:20 UTC | May 16, 10:16 UTC | 2h 55m |
| 2026-05-14 | JYH1208 | BKK → KWE | May 14, 12:05 UTC | May 14, 12:55 UTC | 50m |
| 2026-05-14 | JYH1207 | KWE → BKK | May 14, 09:55 UTC | May 14, 10:55 UTC | 1h 0m |
| 2026-05-13 | JYH1233 | WUX → VTE | May 13, 05:15 UTC | May 13, 10:25 UTC | 5h 10m |
| 2026-05-12 | JYH1208 | BKK → KWE | May 12, 11:50 UTC | May 13, 10:25 UTC | 22h 35m |
| 2026-05-12 | JYH1207 | KWE → BKK | May 12, 09:45 UTC | May 12, 10:40 UTC | 55m |
| 2026-05-10 | JYH1212 | KUL → KWE | May 10, 11:50 UTC | May 10, 12:05 UTC | 15m |
| 2026-05-10 | JYH1211 | KWE → KUL | May 10, 10:05 UTC | May 10, 10:24 UTC | 20m |
| 2026-05-06 | JYH1234 | VTE → WUX | May 6, 09:40 UTC | May 6, 10:05 UTC | 25m |
| 2026-05-06 | JYH1233 | WUX → VTE | May 6, 05:00 UTC | May 6, 05:20 UTC | 19m |
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-220Y page for operator, model, and routing details .