Apparatus

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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
Broadcasting now · callsign CSS155 · 30,025 ft
Flights observed
193
Distinct callsigns
20
Country
CN
Last broadcast
1d ago

Current position

7821EE is currently broadcasting. Map zoomed to live 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 31 2026-06-24
CSS364 - 26 2026-06-25
CSS301 - 21 2026-06-23
CSS302 SF Airlines 13 2026-05-09
CSS398 - 7 2026-06-24
CSS335 SF Airlines 7 2026-05-07
CSS253 - 5 2026-06-19
CSS174 - 5 2026-07-09
CSS242 - 4 2026-06-10
CSS173 - 4 2026-07-09
CSS164 - 4 2026-07-09
CSS241 SF Airlines 3 2026-06-10
CSS239 SF Airlines 3 2026-07-07
CSS232 - 3 2026-06-29
CSS231 - 3 2026-06-29
CSS184 SF Airlines 3 2026-05-21
CSS167 - 3 2026-07-01
CSS163 - 3 2026-06-20
CSS161 - 3 2026-07-06
CSS6835 - 2 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 CSS6835 - Jul 12, 20:45 UTCJul 12, 21:05 UTC20m
2026-07-12 CSS7223 - Jul 12, 18:10 UTCJul 12, 19:05 UTC55m
2026-07-10 CSS158 - Jul 10, 13:00 UTCJul 10, 15:55 UTC2h 55m
2026-07-09 CSS174 - Jul 9, 20:45 UTCJul 10, 11:00 UTC14h 15m
2026-07-09 CSS173 - Jul 9, 18:05 UTCJul 9, 18:30 UTC25m
2026-07-09 CSS164 - Jul 9, 06:00 UTCJul 9, 17:30 UTC11h 30m
2026-07-08 CSS174 - Jul 8, 13:40 UTCJul 9, 03:25 UTC13h 45m
2026-07-08 CSS173 - Jul 8, 11:10 UTCJul 8, 11:30 UTC20m
2026-07-07 CSS160 - Jul 7, 18:20 UTCJul 8, 10:30 UTC16h 10m
2026-07-07 CSS239 ZUH → DEL Jul 7, 13:20 UTCJul 7, 16:20 UTC3h 0m
2026-07-07 CSS240 - Jul 7, 00:00 UTCJul 7, 03:00 UTC3h 0m
2026-07-06 CSS161 - Jul 6, 19:30 UTCJul 6, 22:10 UTC2h 40m
2026-07-05 CSS161 - Jul 5, 23:35 UTCJul 6, 22:10 UTC22h 35m
2026-07-05 CSS174 - Jul 5, 22:15 UTCJul 6, 21:00 UTC22h 45m
2026-07-05 CSS174 - Jul 5, 21:00 UTCJul 6, 19:30 UTC22h 30m
2026-07-05 CSS173 - Jul 5, 18:05 UTCJul 5, 18:25 UTC20m
2026-07-05 CSS173 - Jul 5, 15:25 UTCJul 5, 17:00 UTC1h 35m
2026-07-03 CSS158 - Jul 3, 13:15 UTCJul 3, 16:10 UTC2h 55m
2026-07-02 CSS148 - Jul 2, 15:40 UTCJul 3, 11:05 UTC19h 25m
2026-07-02 CSS239 ZUH → DEL Jul 2, 10:00 UTCJul 2, 14:05 UTC4h 5m
2026-07-02 CSS240 - Jul 2, 00:15 UTCJul 2, 04:00 UTC3h 45m
2026-07-01 CSS161 - Jul 1, 12:20 UTCJul 1, 22:15 UTC9h 55m
2026-07-01 CSS168 - Jul 1, 05:25 UTCJul 1, 08:35 UTC3h 10m
2026-07-01 CSS167 - Jul 1, 00:45 UTCJul 1, 03:45 UTC3h 0m
2026-06-29 CSS232 - Jun 29, 09:25 UTCJun 29, 11:14 UTC1h 50m
2026-06-29 CSS232 - Jun 29, 07:55 UTCJun 29, 08:09 UTC15m
2026-06-29 CSS231 - Jun 29, 05:00 UTCJun 29, 05:15 UTC15m
2026-06-29 CSS231 - Jun 29, 02:05 UTCJun 29, 03:39 UTC1h 35m
2026-06-27 CSS264 - Jun 27, 10:25 UTCJun 27, 10:45 UTC20m
2026-06-27 CSS263 - Jun 27, 08:20 UTCJun 27, 08:55 UTC35m
2026-06-26 CSS6835 - Jun 26, 21:10 UTCJun 26, 21:20 UTC10m
2026-06-26 CSS6834 - Jun 26, 18:49 UTCJun 26, 19:09 UTC20m
2026-06-25 CSS6809 - Jun 25, 18:45 UTCJun 25, 18:59 UTC15m
2026-06-25 CSS364 - Jun 25, 05:39 UTCJun 25, 05:55 UTC15m
2026-06-25 CSS364 - Jun 25, 01:40 UTCJun 25, 03:15 UTC1h 35m
2026-06-24 CSS363 SZX → NRT Jun 24, 21:34 UTCJun 24, 23:14 UTC1h 40m
2026-06-24 CSS363 SZX → NRT Jun 24, 19:20 UTCJun 24, 19:29 UTC10m
2026-06-24 CSS398 - Jun 24, 01:34 UTCJun 24, 01:49 UTC15m
2026-06-23 CSS398 - Jun 23, 19:44 UTCJun 23, 20:10 UTC25m
2026-06-23 CSS301 - Jun 23, 17:09 UTCJun 23, 17:30 UTC20m
2026-06-23 CSS301 - Jun 23, 14:25 UTCJun 23, 14:39 UTC15m
2026-06-22 CSS148 - Jun 22, 10:44 UTCJun 22, 12:44 UTC2h 0m
2026-06-21 CSS239 ZUH → DEL Jun 21, 20:00 UTCJun 22, 08:29 UTC12h 30m
2026-06-21 CSS159 - Jun 21, 03:30 UTCJun 21, 18:14 UTC14h 45m
2026-06-20 CSS163 - Jun 20, 23:39 UTCJun 21, 01:49 UTC2h 10m
2026-06-19 CSS254 - Jun 19, 07:29 UTCJun 19, 10:19 UTC2h 50m
2026-06-19 CSS253 - Jun 19, 05:40 UTCJun 19, 05:54 UTC15m
2026-06-19 CSS253 - Jun 19, 03:15 UTCJun 19, 05:05 UTC1h 50m
2026-06-17 CSS254 - Jun 17, 07:30 UTCJun 17, 10:20 UTC2h 50m
2026-06-17 CSS253 - Jun 17, 05:10 UTCJun 17, 05:20 UTC10m

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 .

Mode-S 7821EE frequently asked

What is Mode-S code 7821EE?
7821EE is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-227E.
Where is Mode-S 7821EE registered?
Mode-S code 7821EE is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7821EE broadcasting right now?
Yes. Mode-S 7821EE is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7821EE, octal 36020756, decimal 7,873,006.
What flights does 7821EE operate?
Mode-S 7821EE has broadcast 20 distinct callsigns, including CSS363, CSS364, CSS301, CSS302, CSS398.