Apparatus

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sensors Mode-S transponder

780B21

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-5775 · BOEING 737-800

Hex
780B21
Octal
36005441
Decimal
7,867,169
Country
CN
Tail
B-5775
Type
B738
No current signal · last broadcast Jul 24, 07:15 UTC
Flights observed
178
Distinct callsigns
20
Country
CN
Last broadcast
Jul 24, 07:15 UTC

Last known position

Most recent position reported by Mode-S 780B21.

Country allocation

The ICAO 24-bit address 780B21 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
CSZ673 - 8 2026-06-15
CSZ9097 Shenzhen Airlines 6 2026-06-01
CSZ674 - 6 2026-06-15
CSZ8662 - 5 2026-07-13
CSZ9463 Shenzhen Airlines 4 2026-07-23
CSZ9451 - 4 2026-06-25
CSZ9098 Shenzhen Airlines 4 2026-06-01
CSZ9095 - 4 2026-07-18
CSZ8862 - 4 2026-06-27
CSZ633 - 4 2026-07-10
CSZ9816 Shenzhen Airlines 3 2026-06-13
CSZ9815 - 3 2026-07-16
CSZ9526 - 3 2026-07-06
CSZ8861 - 3 2026-06-26
CSZ8665 - 3 2026-07-12
CSZ8538 - 3 2026-07-02
CSZ634 - 3 2026-07-10
CSZ206 Shenzhen Airlines 3 2026-06-07
CSZ9922 Shenzhen Airlines 2 2026-06-18
CSZ9919 - 2 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 CSZ9699 SHE → NKG Jul 24, 06:50 UTCJul 24, 07:15 UTC25m
2026-07-23 CSZ9463 CKG → NKG Jul 23, 03:25 UTCJul 23, 03:40 UTC15m
2026-07-23 CSZ9814 SHA → SZX Jul 23, 00:45 UTCJul 23, 01:20 UTC35m
2026-07-22 CSZ9161 PEK → TFU Jul 22, 15:45 UTCJul 22, 15:55 UTC10m
2026-07-22 CSZ9151 - Jul 22, 01:40 UTCJul 22, 02:00 UTC20m
2026-07-19 CSZ9161 - Jul 19, 14:05 UTCJul 19, 14:15 UTC10m
2026-07-19 CSZ9152 - Jul 19, 05:40 UTCJul 19, 05:55 UTC15m
2026-07-19 CSZ9151 - Jul 19, 01:35 UTCJul 19, 02:00 UTC25m
2026-07-18 CSZ9096 - Jul 18, 05:25 UTCJul 18, 06:35 UTC1h 10m
2026-07-18 CSZ9095 - Jul 18, 03:05 UTCJul 18, 03:55 UTC50m
2026-07-17 CSZ9095 - Jul 17, 06:20 UTCJul 18, 03:55 UTC21h 36m
2026-07-17 CSZ9095 - Jul 17, 05:55 UTCJul 18, 03:55 UTC22h 1m
2026-07-17 CSZ627 WUX → ICN Jul 17, 03:10 UTCJul 17, 03:55 UTC45m
2026-07-16 CSZ9815 - Jul 16, 22:55 UTCJul 16, 23:05 UTC10m
2026-07-16 CSZ9233 - Jul 16, 10:00 UTCJul 16, 10:10 UTC10m
2026-07-16 CSZ9329 - Jul 16, 01:35 UTCJul 16, 01:50 UTC15m
2026-07-15 CSZ9146 - Jul 15, 19:50 UTCJul 15, 20:10 UTC20m
2026-07-15 CSZ9145 - Jul 15, 14:10 UTCJul 15, 14:30 UTC20m
2026-07-15 CSZ9304 - Jul 15, 12:30 UTCJul 15, 12:40 UTC10m
2026-07-15 CSZ9303 - Jul 15, 07:00 UTCJul 15, 07:10 UTC10m
2026-07-15 CSZ9960 - Jul 15, 03:40 UTCJul 15, 03:50 UTC10m
2026-07-14 CSZ9959 - Jul 14, 23:25 UTCJul 14, 23:35 UTC10m
2026-07-14 CSZ9890 - Jul 14, 13:15 UTCJul 14, 13:55 UTC40m
2026-07-14 CSZ9889 - Jul 14, 08:35 UTCJul 14, 08:45 UTC10m
2026-07-14 CSZ9310 - Jul 14, 04:50 UTCJul 14, 05:05 UTC15m
2026-07-13 CSZ8662 - Jul 13, 15:45 UTCJul 13, 16:20 UTC35m
2026-07-12 CSZ8665 - Jul 12, 13:05 UTCJul 12, 13:15 UTC10m
2026-07-12 CSZ9406 - Jul 12, 10:15 UTCJul 12, 10:25 UTC10m
2026-07-12 CSZ9405 - Jul 12, 04:15 UTCJul 12, 04:30 UTC15m
2026-07-11 CSZ9457 - Jul 11, 08:40 UTCJul 11, 08:50 UTC10m
2026-07-11 CSZ9462 - Jul 11, 07:05 UTCJul 11, 07:15 UTC10m
2026-07-11 CSZ9461 - Jul 11, 01:05 UTCJul 11, 01:20 UTC15m
2026-07-10 CSZ9207 - Jul 10, 12:35 UTCJul 10, 12:45 UTC10m
2026-07-10 CSZ634 - Jul 10, 07:45 UTCJul 10, 08:25 UTC40m
2026-07-10 CSZ633 - Jul 10, 05:45 UTCJul 10, 06:30 UTC45m
2026-07-10 CSZ633 - Jul 10, 03:20 UTCJul 10, 03:35 UTC15m
2026-07-09 CSZ8662 - Jul 9, 17:55 UTCJul 9, 18:20 UTC25m
2026-07-08 CSZ8665 - Jul 8, 17:05 UTCJul 8, 17:15 UTC10m
2026-07-07 CSZ9458 - Jul 7, 20:25 UTCJul 7, 20:55 UTC30m
2026-07-07 CSZ9457 - Jul 7, 15:15 UTCJul 7, 15:30 UTC15m
2026-07-07 CSZ9514 - Jul 7, 02:10 UTCJul 7, 08:40 UTC6h 30m
2026-07-06 CSZ9526 - Jul 6, 17:25 UTCJul 6, 17:35 UTC10m
2026-07-06 CSZ8966 - Jul 6, 08:20 UTCJul 6, 08:30 UTC10m
2026-07-06 CSZ8965 - Jul 6, 02:25 UTCJul 6, 07:45 UTC5h 20m
2026-07-06 CSZ8965 - Jul 6, 01:05 UTCJul 6, 01:15 UTC10m
2026-07-05 CSZ9948 - Jul 5, 16:00 UTCJul 5, 16:20 UTC20m
2026-07-05 CSZ9132 - Jul 5, 08:30 UTCJul 5, 08:50 UTC20m
2026-07-05 CSZ9131 - Jul 5, 01:15 UTCJul 5, 01:30 UTC15m
2026-07-04 CSZ9958 - Jul 4, 18:30 UTCJul 4, 18:40 UTC10m
2026-07-04 CSZ9957 - Jul 4, 10:15 UTCJul 4, 10:25 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-5775 page for operator, model, and routing details .

Mode-S 780B21 frequently asked

What is Mode-S code 780B21?
780B21 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-5775.
Where is Mode-S 780B21 registered?
Mode-S code 780B21 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 780B21 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 07:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 780B21, octal 36005441, decimal 7,867,169.
What flights does 780B21 operate?
Mode-S 780B21 has broadcast 20 distinct callsigns, including CSZ673, CSZ9097, CSZ674, CSZ8662, CSZ9463.