sensors Mode-S transponder
78135C
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-1238 · BOEING 737 MAX 8
- Hex
- 78135C
- Octal
- 36011534
- Decimal
- 7,869,276
- Country
- CN
- Tail
- B-1238
- Type
- B38M
- Flights observed
- 46
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 1d ago
Last known position
Country allocation
The ICAO 24-bit address 78135C 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 |
|---|---|---|---|
| CSN6858 | - | 5 | 2026-06-21 |
| CSN6913 | - | 4 | 2026-07-17 |
| CSN6052 | - | 4 | 2026-07-11 |
| CSN6051 | - | 4 | 2026-07-08 |
| CSN6890 | - | 3 | 2026-07-01 |
| CSN5092 | China Southern Airlines | 3 | 2026-05-06 |
| CSN5091 | China Southern Airlines | 3 | 2026-05-06 |
| CSN6915 | - | 2 | 2026-07-13 |
| CSN6914 | - | 2 | 2026-07-12 |
| CSN6040 | - | 2 | 2026-07-15 |
| CSN6039 | - | 2 | 2026-07-15 |
| CSN8896 | China Southern Airlines | 1 | 2026-07-07 |
| CSN8895 | China Southern Airlines | 1 | 2026-07-07 |
| CSN8144 | China Southern Airlines | 1 | 2026-06-08 |
| CSN8143 | China Southern Airlines | 1 | 2026-06-08 |
| CSN6931 | - | 1 | 2026-06-12 |
| CSN6916 | China Southern Airlines | 1 | 2026-05-19 |
| CSN6910 | - | 1 | 2026-07-13 |
| CSN6909 | China Southern Airlines | 1 | 2026-06-23 |
| CSN6908 | - | 1 | 2026-06-28 |
Recent flights last 46
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-17 | CSN6913 | - | Jul 17, 15:40 UTC | Jul 17, 15:55 UTC | 15m |
| 2026-07-15 | CSN6040 | - | Jul 15, 18:55 UTC | Jul 15, 19:25 UTC | 30m |
| 2026-07-15 | CSN6039 | - | Jul 15, 17:00 UTC | Jul 15, 17:30 UTC | 30m |
| 2026-07-13 | CSN6910 | - | Jul 13, 11:50 UTC | Jul 13, 12:10 UTC | 20m |
| 2026-07-13 | CSN6915 | - | Jul 13, 07:20 UTC | Jul 13, 07:35 UTC | 15m |
| 2026-07-12 | CSN6914 | - | Jul 12, 02:40 UTC | Jul 12, 02:55 UTC | 15m |
| 2026-07-11 | CSN6052 | - | Jul 11, 23:50 UTC | Jul 12, 00:05 UTC | 15m |
| 2026-07-10 | CSN6913 | - | Jul 10, 16:40 UTC | Jul 10, 16:55 UTC | 15m |
| 2026-07-09 | CSN6914 | - | Jul 9, 00:20 UTC | Jul 9, 00:35 UTC | 15m |
| 2026-07-08 | CSN6052 | - | Jul 8, 22:00 UTC | Jul 8, 22:10 UTC | 10m |
| 2026-07-08 | CSN6051 | - | Jul 8, 09:45 UTC | Jul 8, 10:05 UTC | 20m |
| 2026-07-07 | CSN8895 | URC → PKX | Jul 7, 14:25 UTC | Jul 7, 14:40 UTC | 15m |
| 2026-07-07 | CSN8896 | URC → YTW | Jul 7, 00:10 UTC | Jul 7, 00:25 UTC | 15m |
| 2026-07-06 | CSN6913 | - | Jul 6, 16:20 UTC | Jul 6, 16:30 UTC | 10m |
| 2026-07-01 | CSN6890 | - | Jul 1, 10:10 UTC | Jul 1, 10:25 UTC | 15m |
| 2026-06-28 | CSN6908 | - | Jun 28, 04:29 UTC | Jun 28, 04:44 UTC | 15m |
| 2026-06-27 | CSN6051 | - | Jun 27, 09:40 UTC | Jun 27, 22:09 UTC | 12h 30m |
| 2026-06-26 | CSN6913 | URC → PKX | Jun 26, 14:50 UTC | Jun 26, 15:05 UTC | 15m |
| 2026-06-24 | CSN6052 | - | Jun 24, 22:19 UTC | Jun 24, 22:35 UTC | 15m |
| 2026-06-24 | CSN6051 | - | Jun 24, 09:45 UTC | Jun 24, 09:59 UTC | 15m |
| 2026-06-23 | CSN6909 | URC → PKX | Jun 23, 15:44 UTC | Jun 23, 15:59 UTC | 15m |
| 2026-06-21 | CSN6858 | - | Jun 21, 07:34 UTC | Jun 21, 07:45 UTC | 10m |
| 2026-06-14 | CSN6040 | - | Jun 14, 18:50 UTC | Jun 14, 19:20 UTC | 30m |
| 2026-06-14 | CSN6039 | - | Jun 14, 17:05 UTC | Jun 14, 17:25 UTC | 20m |
| 2026-06-12 | CSN6931 | - | Jun 12, 07:35 UTC | Jun 12, 07:50 UTC | 15m |
| 2026-06-08 | CSN8144 | TBS → URC | Jun 8, 19:05 UTC | Jun 8, 22:35 UTC | 3h 30m |
| 2026-06-08 | CSN8143 | PKX → URC | Jun 8, 13:25 UTC | Jun 8, 17:35 UTC | 4h 10m |
| 2026-06-04 | CSN6858 | SZX → KHG | Jun 4, 07:15 UTC | Jun 4, 07:25 UTC | 10m |
| 2026-05-30 | CSN6858 | SZX → KHG | May 30, 07:35 UTC | May 30, 07:45 UTC | 10m |
| 2026-05-26 | CSN6858 | SZX → KHG | May 26, 08:50 UTC | May 26, 08:59 UTC | 10m |
| 2026-05-26 | CSN6857 | KHG → SZX | May 26, 06:44 UTC | May 26, 06:54 UTC | 10m |
| 2026-05-22 | CSN6890 | SZX → URC | May 22, 09:55 UTC | May 22, 10:05 UTC | 10m |
| 2026-05-22 | CSN6889 | URC → SZX | May 22, 07:45 UTC | May 22, 07:55 UTC | 10m |
| 2026-05-19 | CSN6916 | PKX → URC | May 19, 09:50 UTC | May 19, 10:05 UTC | 15m |
| 2026-05-18 | CSN6915 | URC → TNA | May 18, 12:25 UTC | May 18, 12:40 UTC | 15m |
| 2026-05-09 | CSN6052 | DYU → PKX | May 9, 22:30 UTC | May 9, 22:45 UTC | 15m |
| 2026-05-09 | CSN6051 | PKX → DYU | May 9, 09:45 UTC | May 9, 10:05 UTC | 20m |
| 2026-05-08 | CSN6903 | URC → PKX | May 8, 09:25 UTC | May 8, 09:39 UTC | 15m |
| 2026-05-06 | CSN5092 | EVN → URC | May 6, 20:00 UTC | May 6, 20:25 UTC | 25m |
| 2026-05-06 | CSN5091 | URC → EVN | May 6, 17:20 UTC | May 6, 17:50 UTC | 29m |
| 2026-05-02 | CSN6890 | SZX → URC | May 2, 09:50 UTC | May 2, 10:00 UTC | 10m |
| 2026-05-01 | CSN5092 | EVN → URC | May 1, 20:05 UTC | May 1, 20:30 UTC | 25m |
| 2026-05-01 | CSN5091 | URC → EVN | May 1, 17:05 UTC | May 1, 17:30 UTC | 25m |
| 2026-04-29 | CSN5092 | EVN → URC | Apr 29, 20:00 UTC | Apr 29, 20:25 UTC | 25m |
| 2026-04-29 | CSN5091 | URC → EVN | Apr 29, 17:25 UTC | Apr 29, 17:55 UTC | 30m |
| 2026-04-18 | CSN6858 | SZX → KHG | Apr 18, 07:25 UTC | Apr 18, 07:35 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-1238 page for operator, model, and routing details .