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sensors Mode-S transponder

781CB2

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-221K · BOEING 767-300

Hex
781CB2
Octal
36016262
Decimal
7,871,666
Country
CN
Tail
B-221K
Type
B763
No current signal · last broadcast 6h ago
Flights observed
131
Distinct callsigns
20
Country
CN
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 781CB2.

Country allocation

The ICAO 24-bit address 781CB2 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
CSS231 - 8 2026-07-02
CSS161 - 7 2026-06-18
CSS7103 - 6 2026-07-17
CSS241 SF Airlines 6 2026-05-27
CSS240 - 6 2026-06-10
CSS239 SF Airlines 6 2026-06-10
CSS232 - 6 2026-07-02
CSS242 - 5 2026-05-27
CSS167 - 5 2026-06-19
CSS121 - 5 2026-07-10
CSS257 - 4 2026-06-09
CSS173 - 4 2026-06-14
CSS169 - 4 2026-07-08
CSS168 - 4 2026-06-20
CSS160 SF Airlines 4 2026-06-15
CSS122 - 4 2026-07-10
CSS7635 - 3 2026-06-28
CSS255 - 3 2026-04-18
CSS254 - 3 2026-05-22
CSS253 - 3 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CSS7103 - Jul 17, 16:55 UTCJul 17, 22:10 UTC5h 15m
2026-07-14 CSS7103 - Jul 14, 16:50 UTCJul 14, 17:10 UTC20m
2026-07-10 CSS122 - Jul 10, 14:55 UTCJul 10, 22:35 UTC7h 40m
2026-07-10 CSS121 - Jul 10, 06:05 UTCJul 10, 13:05 UTC7h 0m
2026-07-09 CSS121 - Jul 9, 16:35 UTCJul 10, 13:05 UTC20h 30m
2026-07-09 CSS170 - Jul 9, 15:40 UTCJul 10, 13:05 UTC21h 25m
2026-07-09 CSS170 - Jul 9, 10:35 UTCJul 10, 06:25 UTC19h 50m
2026-07-09 CSS170 - Jul 9, 10:25 UTCJul 10, 06:25 UTC20h 0m
2026-07-08 CSS169 - Jul 8, 16:35 UTCJul 9, 16:30 UTC23h 55m
2026-07-08 CSS122 - Jul 8, 10:35 UTCJul 9, 10:30 UTC23h 55m
2026-07-08 CSS122 - Jul 8, 09:55 UTCJul 8, 16:50 UTC6h 55m
2026-07-08 CSS121 - Jul 8, 00:25 UTCJul 8, 07:55 UTC7h 30m
2026-07-06 CSS6801 SZX → EHU Jul 6, 17:40 UTCJul 6, 17:55 UTC15m
2026-07-06 CSS6842 - Jul 6, 01:55 UTCJul 6, 02:05 UTC10m
2026-07-05 CSS7103 - Jul 5, 16:55 UTCJul 5, 17:10 UTC15m
2026-07-03 CSS122 - Jul 3, 15:10 UTCJul 3, 22:05 UTC6h 55m
2026-07-03 CSS121 - Jul 3, 05:00 UTCJul 3, 13:20 UTC8h 20m
2026-07-02 CSS121 - Jul 2, 12:35 UTCJul 3, 12:30 UTC23h 55m
2026-07-02 CSS232 - Jul 2, 10:40 UTCJul 3, 10:20 UTC23h 40m
2026-07-02 CSS232 - Jul 2, 09:15 UTCJul 2, 09:25 UTC10m
2026-07-02 CSS231 - Jul 2, 04:40 UTCJul 2, 05:00 UTC20m
2026-07-02 CSS231 - Jul 2, 01:40 UTCJul 2, 03:25 UTC1h 45m
2026-06-30 CSS246 - Jun 30, 08:40 UTCJun 30, 11:45 UTC3h 5m
2026-06-30 CSS245 - Jun 30, 02:50 UTCJun 30, 06:50 UTC4h 0m
2026-06-29 CSS7103 - Jun 29, 17:05 UTCJun 29, 17:30 UTC25m
2026-06-28 CSS7635 - Jun 28, 16:19 UTCJun 28, 16:35 UTC15m
2026-06-27 CSS7635 - Jun 27, 21:55 UTCJun 28, 16:35 UTC18h 40m
2026-06-27 CSS248 - Jun 27, 09:19 UTCJun 27, 22:04 UTC12h 45m
2026-06-27 CSS247 - Jun 27, 03:04 UTCJun 27, 04:05 UTC1h 0m
2026-06-22 CSS6805 - Jun 22, 16:50 UTCJun 22, 17:04 UTC15m
2026-06-22 CSS364 - Jun 22, 05:34 UTCJun 22, 06:00 UTC25m
2026-06-22 CSS364 - Jun 22, 01:29 UTCJun 22, 03:10 UTC1h 40m
2026-06-21 CSS363 SZX → NRT Jun 21, 21:29 UTCJun 21, 23:05 UTC1h 35m
2026-06-21 CSS363 SZX → NRT Jun 21, 19:20 UTCJun 21, 19:29 UTC10m
2026-06-21 CSS332 DEL → SZX Jun 21, 09:15 UTCJun 21, 13:00 UTC3h 45m
2026-06-21 CSS165 NQZ → NQZ Jun 21, 04:54 UTCJun 21, 07:09 UTC2h 15m
2026-06-20 CSS168 - Jun 20, 07:14 UTCJun 20, 07:34 UTC20m
2026-06-20 CSS168 - Jun 20, 03:59 UTCJun 20, 04:09 UTC10m
2026-06-20 CSS168 - Jun 20, 00:14 UTCJun 20, 03:19 UTC3h 5m
2026-06-19 CSS167 - Jun 19, 19:45 UTCJun 19, 22:14 UTC2h 30m
2026-06-19 CSS167 - Jun 19, 00:34 UTCJun 19, 22:14 UTC21h 40m
2026-06-19 CSS167 - Jun 19, 00:29 UTCJun 19, 22:14 UTC21h 45m
2026-06-18 CSS161 - Jun 18, 20:00 UTCJun 18, 22:30 UTC2h 30m
2026-06-17 CSS169 - Jun 17, 00:35 UTCJun 17, 18:35 UTC18h 0m
2026-06-17 CSS148 - Jun 17, 00:05 UTCJun 17, 18:35 UTC18h 30m
2026-06-16 CSS161 - Jun 16, 19:45 UTCJun 16, 22:10 UTC2h 26m
2026-06-15 CSS160 DEL → EHU Jun 15, 15:00 UTCJun 15, 17:25 UTC2h 25m
2026-06-14 CSS159 - Jun 14, 21:00 UTCJun 15, 13:00 UTC15h 59m
2026-06-14 CSS173 - Jun 14, 18:15 UTCJun 14, 18:30 UTC15m
2026-06-14 CSS164 DEL → EHU Jun 14, 03:55 UTCJun 14, 17:35 UTC13h 40m

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-221K page for operator, model, and routing details .

Mode-S 781CB2 frequently asked

What is Mode-S code 781CB2?
781CB2 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-221K.
Where is Mode-S 781CB2 registered?
Mode-S code 781CB2 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781CB2 broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781CB2, octal 36016262, decimal 7,871,666.
What flights does 781CB2 operate?
Mode-S 781CB2 has broadcast 20 distinct callsigns, including CSS231, CSS161, CSS7103, CSS241, CSS240.