sensors Mode-S transponder
7819CD
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-1962 · BOEING 737-800
- Hex
- 7819CD
- Octal
- 36014715
- Decimal
- 7,870,925
- Country
- CN
- Tail
- B-1962
- Type
- B738
- Flights observed
- 36
- Distinct callsigns
- 10
- Country
- CN
- Last broadcast
- Jul 26, 07:35 UTC
Last known position
Country allocation
The ICAO 24-bit address 7819CD 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 10 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| OKA2755 | - | 16 | 2026-07-24 |
| OKA3112 | - | 5 | 2026-07-26 |
| OKA2756 | Okay Airways | 5 | 2026-07-24 |
| OKA3189 | - | 2 | 2026-05-22 |
| OKA3111 | - | 2 | 2026-07-25 |
| OKA3036 | Okay Airways | 2 | 2026-06-15 |
| OKA3153 | - | 1 | 2026-07-19 |
| OKA2994 | - | 1 | 2026-06-30 |
| OKA2951 | - | 1 | 2026-07-08 |
| OKA2930 | Okay Airways | 1 | 2026-05-21 |
Recent flights last 36
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | OKA3112 | - | Jul 26, 07:15 UTC | Jul 26, 07:35 UTC | 20m |
| 2026-07-25 | OKA3111 | - | Jul 25, 08:25 UTC | Jul 25, 08:45 UTC | 20m |
| 2026-07-24 | OKA2756 | TSN → TFU | Jul 24, 08:35 UTC | Jul 24, 14:10 UTC | 5h 35m |
| 2026-07-24 | OKA2755 | - | Jul 24, 06:25 UTC | Jul 24, 06:40 UTC | 15m |
| 2026-07-23 | OKA2755 | - | Jul 23, 14:05 UTC | Jul 24, 01:40 UTC | 11h 35m |
| 2026-07-23 | OKA2755 | - | Jul 23, 01:20 UTC | Jul 23, 14:10 UTC | 12h 50m |
| 2026-07-21 | OKA2756 | TSN → TFU | Jul 21, 09:15 UTC | Jul 21, 14:45 UTC | 5h 30m |
| 2026-07-21 | OKA3112 | - | Jul 21, 06:45 UTC | Jul 21, 07:05 UTC | 20m |
| 2026-07-19 | OKA3153 | - | Jul 19, 06:00 UTC | Jul 19, 06:25 UTC | 25m |
| 2026-07-12 | OKA3112 | - | Jul 12, 07:15 UTC | Jul 12, 07:31 UTC | 15m |
| 2026-07-11 | OKA3111 | - | Jul 11, 10:25 UTC | Jul 11, 10:50 UTC | 25m |
| 2026-07-10 | OKA2756 | - | Jul 10, 10:25 UTC | Jul 11, 01:50 UTC | 15h 25m |
| 2026-07-10 | OKA2755 | - | Jul 10, 01:35 UTC | Jul 10, 01:45 UTC | 10m |
| 2026-07-09 | OKA2755 | - | Jul 9, 01:35 UTC | Jul 9, 14:25 UTC | 12h 50m |
| 2026-07-08 | OKA2951 | - | Jul 8, 07:40 UTC | Jul 9, 01:45 UTC | 18h 5m |
| 2026-07-04 | OKA2755 | - | Jul 4, 14:10 UTC | Jul 5, 02:00 UTC | 11h 50m |
| 2026-07-04 | OKA3112 | - | Jul 4, 06:00 UTC | Jul 4, 06:20 UTC | 20m |
| 2026-06-30 | OKA2994 | - | Jun 30, 06:25 UTC | Jun 30, 06:35 UTC | 10m |
| 2026-06-15 | OKA3036 | NNG → SYX | Jun 15, 15:15 UTC | Jun 15, 15:35 UTC | 20m |
| 2026-06-14 | OKA3036 | NNG → SYX | Jun 14, 15:15 UTC | Jun 14, 15:25 UTC | 10m |
| 2026-06-12 | OKA3112 | - | Jun 12, 07:35 UTC | Jun 12, 07:55 UTC | 20m |
| 2026-06-07 | OKA2755 | - | Jun 7, 01:04 UTC | Jun 7, 14:25 UTC | 13h 20m |
| 2026-06-05 | OKA2755 | - | Jun 5, 01:20 UTC | Jun 5, 14:15 UTC | 12h 55m |
| 2026-06-01 | OKA2755 | - | Jun 1, 01:15 UTC | Jun 1, 14:15 UTC | 13h 0m |
| 2026-05-30 | OKA2755 | - | May 30, 01:05 UTC | May 30, 14:30 UTC | 13h 25m |
| 2026-05-28 | OKA2755 | - | May 28, 01:30 UTC | May 28, 14:25 UTC | 12h 55m |
| 2026-05-27 | OKA2755 | - | May 27, 14:05 UTC | May 28, 01:40 UTC | 11h 35m |
| 2026-05-27 | OKA2755 | - | May 27, 01:09 UTC | May 27, 14:10 UTC | 13h 1m |
| 2026-05-22 | OKA3189 | - | May 22, 12:30 UTC | May 22, 12:40 UTC | 10m |
| 2026-05-21 | OKA2930 | ZUH → KHN | May 21, 08:15 UTC | May 21, 08:30 UTC | 15m |
| 2026-05-19 | OKA3189 | - | May 19, 01:55 UTC | May 19, 02:10 UTC | 15m |
| 2026-05-04 | OKA2755 | - | May 4, 01:15 UTC | May 4, 14:05 UTC | 12h 50m |
| 2026-05-02 | OKA2755 | - | May 2, 01:10 UTC | May 2, 14:10 UTC | 13h 0m |
| 2026-04-30 | OKA2756 | TSN → TFU | Apr 30, 01:20 UTC | Apr 30, 14:15 UTC | 12h 55m |
| 2026-04-28 | OKA2755 | - | Apr 28, 01:20 UTC | Apr 28, 14:20 UTC | 13h 0m |
| 2026-04-19 | OKA2756 | TSN → TFU | Apr 19, 14:50 UTC | Apr 19, 15:00 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-1962 page for operator, model, and routing details .