sensors Mode-S transponder
7821EE
ICAO 24-bit transponder address · allocated to China
Currently assigned to B-227E · BOEING 767-300
- Hex
- 7821EE
- Octal
- 36020756
- Decimal
- 7,873,006
- Country
- CN
- Tail
- B-227E
- Type
- B763
- Flights observed
- 124
- Distinct callsigns
- 20
- Country
- CN
- Last broadcast
- 19h ago
Last known position
Country allocation
The ICAO 24-bit address 7821EE 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 |
|---|---|---|---|
| CSS363 | SF Airlines | 29 | 2026-05-13 |
| CSS364 | SF Airlines | 24 | 2026-05-14 |
| CSS301 | SF Airlines | 19 | 2026-05-09 |
| CSS302 | SF Airlines | 13 | 2026-05-09 |
| CSS335 | SF Airlines | 7 | 2026-05-07 |
| CSS398 | - | 5 | 2026-04-25 |
| CSS184 | SF Airlines | 3 | 2026-05-21 |
| CSS164 | SF Airlines | 3 | 2026-05-24 |
| CSS358 | SF Airlines | 2 | 2026-05-02 |
| CSS172 | - | 2 | 2026-05-29 |
| CSS167 | - | 2 | 2026-05-24 |
| CSS163 | SF Airlines | 2 | 2026-05-24 |
| CSS7635 | SF Airlines | 1 | 2026-05-19 |
| CSS6846 | SF Airlines | 1 | 2026-04-16 |
| CSS6803 | SF Airlines | 1 | 2026-05-14 |
| CSS6801 | SF Airlines | 1 | 2026-05-01 |
| CSS357 | SF Airlines | 1 | 2026-05-01 |
| CSS336 | - | 1 | 2026-04-17 |
| CSS183 | SF Airlines | 1 | 2026-05-20 |
| CSS174 | - | 1 | 2026-05-17 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | CSS172 | - | May 29, 07:55 UTC | May 29, 09:30 UTC | 1h 35m |
| 2026-05-29 | CSS172 | - | May 29, 00:50 UTC | May 29, 04:35 UTC | 3h 45m |
| 2026-05-28 | CSS171 | - | May 28, 19:40 UTC | May 28, 22:25 UTC | 2h 45m |
| 2026-05-24 | CSS167 | - | May 24, 20:05 UTC | May 25, 04:00 UTC | 7h 55m |
| 2026-05-24 | CSS167 | - | May 24, 07:35 UTC | May 25, 04:00 UTC | 20h 25m |
| 2026-05-24 | CSS164 | DEL → EHU | May 24, 05:35 UTC | May 25, 04:00 UTC | 22h 25m |
| 2026-05-24 | CSS164 | DEL → EHU | May 24, 05:25 UTC | May 25, 03:30 UTC | 22h 5m |
| 2026-05-24 | CSS163 | EHU → DEL | May 24, 00:30 UTC | May 24, 03:15 UTC | 2h 45m |
| 2026-05-22 | CSS170 | - | May 22, 17:55 UTC | May 22, 18:50 UTC | 55m |
| 2026-05-21 | CSS184 | ORD → YHZ | May 21, 12:55 UTC | May 21, 13:15 UTC | 20m |
| 2026-05-21 | CSS184 | ORD → YHZ | May 21, 10:00 UTC | May 21, 10:10 UTC | 10m |
| 2026-05-21 | CSS184 | ORD → YHZ | May 21, 06:20 UTC | May 21, 08:20 UTC | 2h 0m |
| 2026-05-20 | CSS183 | ANC → LAX | May 20, 15:55 UTC | May 21, 03:35 UTC | 11h 40m |
| 2026-05-19 | CSS7635 | SHE → EHU | May 19, 21:55 UTC | May 20, 16:05 UTC | 18h 11m |
| 2026-05-19 | CSS156 | LHE → EHU | May 19, 12:50 UTC | May 19, 22:00 UTC | 9h 10m |
| 2026-05-18 | CSS160 | DEL → EHU | May 18, 16:35 UTC | May 19, 10:15 UTC | 17h 39m |
| 2026-05-17 | CSS159 | EHU → DEL | May 17, 23:00 UTC | May 18, 14:20 UTC | 15h 20m |
| 2026-05-17 | CSS174 | - | May 17, 21:05 UTC | May 17, 21:20 UTC | 15m |
| 2026-05-17 | CSS164 | DEL → EHU | May 17, 06:25 UTC | May 17, 18:55 UTC | 12h 30m |
| 2026-05-17 | CSS163 | EHU → DEL | May 17, 01:35 UTC | May 17, 03:50 UTC | 2h 15m |
| 2026-05-14 | CSS6803 | SZX → EHU | May 14, 17:35 UTC | May 14, 17:45 UTC | 10m |
| 2026-05-14 | CSS364 | NRT → SZX | May 14, 03:20 UTC | May 14, 04:40 UTC | 1h 20m |
| 2026-05-13 | CSS363 | SZX → NRT | May 13, 20:30 UTC | May 13, 23:20 UTC | 2h 50m |
| 2026-05-13 | CSS363 | SZX → NRT | May 13, 19:30 UTC | May 13, 19:40 UTC | 10m |
| 2026-05-13 | CSS364 | NRT → SZX | May 13, 06:00 UTC | May 13, 06:15 UTC | 15m |
| 2026-05-13 | CSS364 | NRT → SZX | May 13, 01:55 UTC | May 13, 03:15 UTC | 1h 20m |
| 2026-05-12 | CSS363 | SZX → NRT | May 12, 21:55 UTC | May 12, 23:15 UTC | 1h 20m |
| 2026-05-12 | CSS363 | SZX → NRT | May 12, 19:30 UTC | May 12, 19:40 UTC | 10m |
| 2026-05-12 | CSS364 | NRT → SZX | May 12, 05:15 UTC | May 12, 05:30 UTC | 15m |
| 2026-05-11 | CSS363 | SZX → NRT | May 11, 21:50 UTC | May 11, 22:35 UTC | 44m |
| 2026-05-11 | CSS363 | SZX → NRT | May 11, 19:30 UTC | May 11, 19:40 UTC | 10m |
| 2026-05-11 | CSS364 | NRT → SZX | May 11, 01:15 UTC | May 11, 02:45 UTC | 1h 30m |
| 2026-05-10 | CSS363 | SZX → NRT | May 10, 21:40 UTC | May 10, 23:00 UTC | 1h 20m |
| 2026-05-10 | CSS363 | SZX → NRT | May 10, 19:24 UTC | May 10, 19:35 UTC | 10m |
| 2026-05-09 | CSS302 | SIN → SZX | May 9, 22:45 UTC | May 9, 23:00 UTC | 15m |
| 2026-05-09 | CSS302 | SIN → SZX | May 9, 19:35 UTC | May 9, 19:45 UTC | 10m |
| 2026-05-09 | CSS301 | SZX → SIN | May 9, 16:40 UTC | May 9, 16:55 UTC | 15m |
| 2026-05-09 | CSS301 | SZX → SIN | May 9, 13:55 UTC | May 9, 14:05 UTC | 10m |
| 2026-05-08 | CSS302 | SIN → SZX | May 8, 19:55 UTC | May 8, 20:10 UTC | 15m |
| 2026-05-08 | CSS301 | SZX → SIN | May 8, 17:05 UTC | May 8, 17:20 UTC | 15m |
| 2026-05-08 | CSS301 | SZX → SIN | May 8, 14:15 UTC | May 8, 14:30 UTC | 15m |
| 2026-05-08 | CSS364 | NRT → SZX | May 8, 01:24 UTC | May 8, 02:55 UTC | 1h 30m |
| 2026-05-07 | CSS363 | SZX → NRT | May 7, 21:35 UTC | May 7, 22:59 UTC | 1h 24m |
| 2026-05-07 | CSS363 | SZX → NRT | May 7, 19:20 UTC | May 7, 19:30 UTC | 10m |
| 2026-05-07 | CSS335 | SZX → MAA | May 7, 07:10 UTC | May 7, 13:40 UTC | 6h 30m |
| 2026-05-07 | CSS335 | SZX → MAA | May 7, 04:45 UTC | May 7, 05:00 UTC | 15m |
| 2026-05-06 | CSS302 | SIN → SZX | May 6, 22:50 UTC | May 6, 23:10 UTC | 20m |
| 2026-05-06 | CSS302 | SIN → SZX | May 6, 19:55 UTC | May 6, 20:10 UTC | 15m |
| 2026-05-06 | CSS301 | SZX → SIN | May 6, 17:10 UTC | May 6, 17:25 UTC | 15m |
| 2026-05-06 | CSS301 | SZX → SIN | May 6, 14:20 UTC | May 6, 14:30 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-227E page for operator, model, and routing details .