sensors Mode-S transponder
78135B
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-1237 · BOEING 737-800
- Hex
- 78135B
- Octal
- 36011533
- Decimal
- 7,869,275
- Country
- CN
- Tail
- B-1237
- Type
- B738
- Flights observed
- 42
- Distinct callsigns
- 18
- Country
- CN
- Last broadcast
- 2d ago
Last known position
Country allocation
The ICAO 24-bit address 78135B 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 18 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CSN604 | - | 7 | 2026-06-23 |
| CSN603 | - | 7 | 2026-06-23 |
| CSN3021 | - | 4 | 2026-06-19 |
| CSN3022 | China Southern Airlines | 3 | 2026-06-20 |
| CSN6912 | - | 2 | 2026-07-03 |
| CSN6906 | - | 2 | 2026-07-07 |
| CSN6905 | - | 2 | 2026-07-07 |
| CSN6894 | China Southern Airlines | 2 | 2026-06-11 |
| CSN6893 | China Southern Airlines | 2 | 2026-06-10 |
| CSN5603 | - | 2 | 2026-06-13 |
| CSN8894 | - | 1 | 2026-07-06 |
| CSN8199 | China Southern Airlines | 1 | 2026-04-28 |
| CSN6916 | China Southern Airlines | 1 | 2026-04-18 |
| CSN6911 | China Southern Airlines | 1 | 2026-04-28 |
| CSN6100 | - | 1 | 2026-07-16 |
| CSN6099 | - | 1 | 2026-07-16 |
| CSN6040 | China Southern Airlines | 1 | 2026-06-01 |
| CSN6039 | China Southern Airlines | 1 | 2026-06-01 |
Recent flights last 42
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-16 | CSN6100 | - | Jul 16, 09:10 UTC | Jul 16, 09:35 UTC | 25m |
| 2026-07-16 | CSN6099 | - | Jul 16, 07:30 UTC | Jul 16, 07:50 UTC | 20m |
| 2026-07-07 | CSN6906 | - | Jul 7, 14:20 UTC | Jul 7, 14:40 UTC | 20m |
| 2026-07-07 | CSN6905 | - | Jul 7, 10:30 UTC | Jul 7, 10:40 UTC | 10m |
| 2026-07-06 | CSN8894 | - | Jul 6, 07:50 UTC | Jul 6, 08:05 UTC | 15m |
| 2026-07-03 | CSN6912 | - | Jul 3, 07:00 UTC | Jul 3, 07:10 UTC | 10m |
| 2026-07-01 | - | - | Jul 1, 06:05 UTC | Jul 1, 06:15 UTC | 10m |
| 2026-06-26 | CSN6906 | PKX → URC | Jun 26, 12:50 UTC | Jun 26, 13:15 UTC | 25m |
| 2026-06-26 | CSN6905 | - | Jun 26, 10:39 UTC | Jun 26, 10:55 UTC | 15m |
| 2026-06-23 | CSN604 | - | Jun 23, 08:59 UTC | Jun 23, 09:20 UTC | 20m |
| 2026-06-23 | CSN603 | - | Jun 23, 06:55 UTC | Jun 23, 07:29 UTC | 35m |
| 2026-06-20 | CSN3022 | HKG → URC | Jun 20, 00:29 UTC | Jun 20, 00:44 UTC | 15m |
| 2026-06-19 | CSN3021 | - | Jun 19, 21:19 UTC | Jun 19, 21:54 UTC | 35m |
| 2026-06-18 | CSN3022 | HKG → URC | Jun 18, 00:35 UTC | Jun 18, 00:50 UTC | 15m |
| 2026-06-17 | CSN3021 | URC → HKG | Jun 17, 21:45 UTC | Jun 17, 22:20 UTC | 35m |
| 2026-06-13 | CSN5603 | - | Jun 13, 03:30 UTC | Jun 13, 03:40 UTC | 10m |
| 2026-06-11 | CSN6894 | TSN → URC | Jun 11, 00:35 UTC | Jun 11, 00:55 UTC | 20m |
| 2026-06-10 | CSN6893 | URC → TSN | Jun 10, 13:20 UTC | Jun 10, 13:45 UTC | 25m |
| 2026-06-07 | CSN604 | HKG → URC | Jun 7, 09:20 UTC | Jun 7, 09:35 UTC | 15m |
| 2026-06-07 | CSN603 | URC → HKG | Jun 7, 06:50 UTC | Jun 7, 07:35 UTC | 45m |
| 2026-06-06 | CSN604 | HKG → URC | Jun 6, 09:24 UTC | Jun 6, 09:45 UTC | 20m |
| 2026-06-06 | CSN603 | URC → HKG | Jun 6, 06:55 UTC | Jun 6, 07:25 UTC | 30m |
| 2026-06-04 | CSN604 | HKG → URC | Jun 4, 09:05 UTC | Jun 4, 09:20 UTC | 15m |
| 2026-06-04 | CSN603 | URC → HKG | Jun 4, 06:35 UTC | Jun 4, 07:15 UTC | 40m |
| 2026-06-01 | CSN6040 | TBS → URC | Jun 1, 18:40 UTC | Jun 1, 22:10 UTC | 3h 30m |
| 2026-06-01 | CSN6039 | URC → TBS | Jun 1, 12:55 UTC | Jun 1, 17:00 UTC | 4h 5m |
| 2026-05-30 | CSN3021 | URC → HKG | May 30, 21:20 UTC | May 30, 21:50 UTC | 30m |
| 2026-05-21 | CSN3022 | HKG → URC | May 21, 01:15 UTC | May 21, 01:35 UTC | 20m |
| 2026-05-20 | CSN3021 | URC → HKG | May 20, 21:35 UTC | May 20, 22:10 UTC | 35m |
| 2026-05-19 | CSN6894 | TSN → URC | May 19, 00:35 UTC | May 19, 00:50 UTC | 15m |
| 2026-05-18 | CSN6893 | URC → TSN | May 18, 13:05 UTC | May 18, 13:25 UTC | 20m |
| 2026-05-15 | CSN604 | HKG → URC | May 15, 10:00 UTC | May 15, 10:15 UTC | 15m |
| 2026-05-15 | CSN603 | URC → HKG | May 15, 07:15 UTC | May 15, 07:45 UTC | 30m |
| 2026-05-06 | CSN604 | HKG → URC | May 6, 08:55 UTC | May 6, 09:15 UTC | 20m |
| 2026-05-06 | CSN603 | URC → HKG | May 6, 06:40 UTC | May 6, 07:01 UTC | 20m |
| 2026-05-05 | CSN5603 | - | May 5, 03:20 UTC | May 5, 03:35 UTC | 15m |
| 2026-04-30 | CSN604 | HKG → URC | Apr 30, 09:05 UTC | Apr 30, 09:20 UTC | 15m |
| 2026-04-30 | CSN603 | URC → HKG | Apr 30, 06:25 UTC | Apr 30, 07:10 UTC | 45m |
| 2026-04-29 | CSN6912 | PKX → URC | Apr 29, 06:29 UTC | Apr 29, 06:45 UTC | 15m |
| 2026-04-28 | CSN8199 | PKX → URC | Apr 28, 06:25 UTC | Apr 28, 06:40 UTC | 15m |
| 2026-04-28 | CSN6911 | URC → PKX | Apr 28, 04:10 UTC | Apr 28, 04:20 UTC | 10m |
| 2026-04-18 | CSN6916 | PKX → URC | Apr 18, 09:55 UTC | Apr 18, 10:15 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-1237 page for operator, model, and routing details .