sensors Mode-S transponder
781398
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-1267 · BOEING 737-800
- Hex
- 781398
- Octal
- 36011630
- Decimal
- 7,869,336
- Country
- CN
- Tail
- B-1267
- Type
- B738
- Flights observed
- 55
- Distinct callsigns
- 16
- Country
- CN
- Last broadcast
- 16h ago
Last known position
Country allocation
The ICAO 24-bit address 781398 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 16 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| OKA2764 | - | 11 | 2026-06-29 |
| OKA3100 | - | 10 | 2026-07-06 |
| OKA3064 | - | 6 | 2026-06-22 |
| OKA3063 | - | 5 | 2026-06-22 |
| OKA2763 | - | 4 | 2026-06-24 |
| OKA2755 | - | 4 | 2026-07-17 |
| OKA3022 | - | 3 | 2026-06-27 |
| OKA3021 | - | 2 | 2026-06-27 |
| OKA2994 | Okay Airways | 2 | 2026-05-02 |
| OKA2756 | - | 2 | 2026-07-12 |
| OKA3153 | - | 1 | 2026-07-10 |
| OKA3112 | - | 1 | 2026-07-11 |
| OKA2993 | Okay Airways | 1 | 2026-05-05 |
| OKA2931 | - | 1 | 2026-07-07 |
| OKA2887 | Okay Airways | 1 | 2026-06-20 |
| OKA2703 | Okay Airways | 1 | 2026-04-15 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-17 | OKA2755 | - | Jul 17, 05:35 UTC | Jul 17, 17:40 UTC | 12h 5m |
| 2026-07-16 | OKA2755 | - | Jul 16, 15:30 UTC | Jul 17, 05:39 UTC | 14h 10m |
| 2026-07-15 | OKA2755 | - | Jul 15, 01:10 UTC | Jul 15, 14:30 UTC | 13h 20m |
| 2026-07-14 | OKA2755 | - | Jul 14, 01:15 UTC | Jul 14, 14:25 UTC | 13h 10m |
| 2026-07-12 | OKA2756 | - | Jul 12, 14:01 UTC | Jul 12, 14:10 UTC | 10m |
| 2026-07-11 | OKA2756 | - | Jul 11, 10:10 UTC | Jul 11, 10:20 UTC | 10m |
| 2026-07-11 | OKA3112 | - | Jul 11, 06:10 UTC | Jul 11, 06:35 UTC | 25m |
| 2026-07-10 | OKA3153 | - | Jul 10, 07:25 UTC | Jul 10, 10:50 UTC | 3h 25m |
| 2026-07-07 | OKA2931 | - | Jul 7, 06:05 UTC | Jul 7, 06:25 UTC | 20m |
| 2026-07-06 | OKA3100 | - | Jul 6, 15:00 UTC | Jul 6, 15:25 UTC | 25m |
| 2026-06-30 | OKA3100 | - | Jun 30, 15:05 UTC | Jun 30, 15:25 UTC | 20m |
| 2026-06-29 | OKA2764 | - | Jun 29, 05:50 UTC | Jun 29, 05:59 UTC | 10m |
| 2026-06-28 | OKA2764 | - | Jun 28, 07:14 UTC | Jun 28, 07:25 UTC | 10m |
| 2026-06-27 | OKA3022 | - | Jun 27, 07:59 UTC | Jun 27, 08:10 UTC | 10m |
| 2026-06-27 | OKA3021 | - | Jun 27, 05:04 UTC | Jun 27, 05:15 UTC | 10m |
| 2026-06-25 | OKA3100 | - | Jun 25, 15:20 UTC | Jun 25, 15:44 UTC | 25m |
| 2026-06-24 | OKA2764 | - | Jun 24, 04:50 UTC | Jun 24, 04:59 UTC | 10m |
| 2026-06-24 | OKA2763 | - | Jun 24, 03:15 UTC | Jun 24, 03:24 UTC | 10m |
| 2026-06-23 | OKA2764 | - | Jun 23, 06:49 UTC | Jun 23, 06:59 UTC | 10m |
| 2026-06-22 | OKA3064 | - | Jun 22, 08:00 UTC | Jun 22, 08:15 UTC | 15m |
| 2026-06-22 | OKA3063 | - | Jun 22, 05:10 UTC | Jun 22, 05:20 UTC | 10m |
| 2026-06-20 | OKA2887 | CSX → SYX | Jun 20, 07:04 UTC | Jun 20, 07:29 UTC | 25m |
| 2026-06-14 | OKA2764 | - | Jun 14, 06:00 UTC | Jun 14, 06:15 UTC | 15m |
| 2026-06-13 | OKA3022 | XAI → TSN | Jun 13, 08:15 UTC | Jun 13, 08:25 UTC | 10m |
| 2026-06-12 | OKA3100 | - | Jun 12, 15:15 UTC | Jun 12, 15:40 UTC | 25m |
| 2026-06-11 | OKA3022 | XAI → TSN | Jun 11, 08:00 UTC | Jun 11, 08:10 UTC | 10m |
| 2026-06-10 | OKA3100 | - | Jun 10, 14:55 UTC | Jun 10, 15:15 UTC | 20m |
| 2026-06-08 | OKA3064 | SZX → EHU | Jun 8, 10:45 UTC | Jun 8, 10:55 UTC | 10m |
| 2026-06-08 | OKA3063 | EHU → SZX | Jun 8, 09:05 UTC | Jun 8, 09:15 UTC | 10m |
| 2026-06-07 | OKA3100 | - | Jun 7, 14:40 UTC | Jun 7, 15:00 UTC | 20m |
| 2026-06-06 | OKA2764 | - | Jun 6, 08:25 UTC | Jun 6, 08:35 UTC | 10m |
| 2026-06-05 | OKA3064 | SZX → EHU | Jun 5, 09:30 UTC | Jun 5, 09:40 UTC | 10m |
| 2026-06-05 | OKA3063 | EHU → SZX | Jun 5, 06:45 UTC | Jun 5, 06:55 UTC | 10m |
| 2026-06-04 | OKA3100 | - | Jun 4, 14:55 UTC | Jun 4, 15:15 UTC | 20m |
| 2026-06-03 | OKA3064 | SZX → EHU | Jun 3, 07:55 UTC | Jun 3, 08:05 UTC | 10m |
| 2026-06-02 | OKA3100 | - | Jun 2, 14:55 UTC | Jun 2, 15:15 UTC | 20m |
| 2026-05-30 | OKA2764 | - | May 30, 04:45 UTC | May 30, 04:55 UTC | 10m |
| 2026-05-29 | OKA3063 | EHU → SZX | May 29, 06:00 UTC | May 29, 06:10 UTC | 10m |
| 2026-05-28 | OKA3100 | - | May 28, 15:20 UTC | May 28, 15:40 UTC | 20m |
| 2026-05-27 | OKA2764 | - | May 27, 04:45 UTC | May 27, 04:55 UTC | 10m |
| 2026-05-27 | OKA2763 | - | May 27, 03:14 UTC | May 27, 03:24 UTC | 10m |
| 2026-05-26 | OKA2764 | - | May 26, 04:54 UTC | May 26, 05:05 UTC | 10m |
| 2026-05-25 | OKA2764 | - | May 25, 05:20 UTC | May 25, 05:30 UTC | 10m |
| 2026-05-25 | OKA2763 | - | May 25, 03:30 UTC | May 25, 03:50 UTC | 20m |
| 2026-05-24 | OKA2764 | - | May 24, 04:45 UTC | May 24, 04:55 UTC | 10m |
| 2026-05-24 | OKA2763 | - | May 24, 03:15 UTC | May 24, 03:25 UTC | 10m |
| 2026-05-22 | OKA3064 | SZX → EHU | May 22, 08:55 UTC | May 22, 09:05 UTC | 10m |
| 2026-05-21 | OKA3100 | - | May 21, 15:15 UTC | May 21, 15:35 UTC | 20m |
| 2026-05-05 | OKA2993 | TYN → SHE | May 5, 02:50 UTC | May 5, 03:00 UTC | 10m |
| 2026-05-02 | OKA2994 | SHE → TYN | May 2, 06:10 UTC | May 2, 06:20 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-1267 page for operator, model, and routing details .