Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781CD4

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-327H · AIRBUS A-321neo

Hex
781CD4
Octal
36016324
Decimal
7,871,700
Country
CN
Tail
B-327H
Type
A21N
No current signal · last broadcast 10h ago
Flights observed
58
Distinct callsigns
15
Country
CN
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S 781CD4.

Country allocation

The ICAO 24-bit address 781CD4 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 15 distinct

Callsign Airline Flights Last seen
CSN5098 China Southern Airlines 9 2026-05-30
CSN5097 China Southern Airlines 9 2026-05-30
CSN355 China Southern Airlines 8 2026-06-01
CSN356 China Southern Airlines 7 2026-06-01
CSN318 China Southern Airlines 6 2026-06-04
CSN317 China Southern Airlines 6 2026-06-04
CSN8010 China Southern Airlines 2 2026-06-03
CSN8009 China Southern Airlines 2 2026-06-03
CSN6028 China Southern Airlines 2 2026-04-28
CSN3193 China Southern Airlines 2 2026-05-14
CSN5068 China Southern Airlines 1 2026-05-21
CSN5067 China Southern Airlines 1 2026-05-21
CSN5004 China Southern Airlines 1 2026-05-05
CSN5003 China Southern Airlines 1 2026-05-04
CSN3194 China Southern Airlines 1 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-04 CSN318 GMP → PKX Jun 4, 05:00 UTCJun 4, 05:30 UTC30m
2026-06-04 CSN317 PKX → GMP Jun 4, 02:30 UTCJun 4, 02:50 UTC20m
2026-06-03 CSN8010 DAC → PKX Jun 3, 16:40 UTCJun 3, 17:35 UTC55m
2026-06-03 CSN8009 PKX → DAC Jun 3, 10:25 UTCJun 3, 15:05 UTC4h 40m
2026-06-01 CSN356 HKG → PKX Jun 1, 05:50 UTCJun 1, 06:05 UTC15m
2026-06-01 CSN355 PKX → HKG Jun 1, 03:20 UTCJun 1, 03:55 UTC35m
2026-05-30 CSN5098 ALA → PKX May 30, 21:40 UTCMay 30, 21:50 UTC10m
2026-05-30 CSN5097 PKX → ALA May 30, 11:00 UTCMay 30, 11:20 UTC20m
2026-05-28 CSN5098 ALA → PKX May 28, 22:50 UTCMay 28, 23:00 UTC10m
2026-05-28 CSN5097 PKX → ALA May 28, 12:20 UTCMay 28, 12:40 UTC20m
2026-05-26 CSN5098 ALA → PKX May 26, 21:29 UTCMay 26, 21:40 UTC10m
2026-05-26 CSN5097 PKX → ALA May 26, 10:54 UTCMay 26, 11:09 UTC15m
2026-05-26 CSN356 HKG → PKX May 26, 05:54 UTCMay 26, 06:14 UTC20m
2026-05-26 CSN355 PKX → HKG May 26, 03:19 UTCMay 26, 04:00 UTC40m
2026-05-22 CSN356 HKG → PKX May 22, 06:00 UTCMay 22, 06:20 UTC20m
2026-05-22 CSN355 PKX → HKG May 22, 03:25 UTCMay 22, 04:05 UTC40m
2026-05-21 CSN5068 FRU → PKX May 21, 21:55 UTCMay 21, 22:10 UTC15m
2026-05-21 CSN5067 PKX → FRU May 21, 10:55 UTCMay 21, 11:20 UTC25m
2026-05-21 CSN356 HKG → PKX May 21, 06:25 UTCMay 21, 06:40 UTC15m
2026-05-21 CSN355 PKX → HKG May 21, 03:20 UTCMay 21, 04:05 UTC45m
2026-05-20 CSN355 PKX → HKG May 20, 08:55 UTCMay 21, 04:05 UTC19h 10m
2026-05-19 CSN5098 ALA → PKX May 19, 21:05 UTCMay 19, 21:20 UTC15m
2026-05-19 CSN5097 PKX → ALA May 19, 10:45 UTCMay 19, 11:05 UTC20m
2026-05-19 CSN356 HKG → PKX May 19, 06:00 UTCMay 19, 06:20 UTC20m
2026-05-19 CSN355 PKX → HKG May 19, 03:20 UTCMay 19, 03:50 UTC30m
2026-05-14 CSN3193 SZX → PKX May 14, 04:50 UTCMay 14, 05:10 UTC20m
2026-05-14 CSN3194 PKX → SZX May 14, 02:40 UTCMay 14, 02:55 UTC15m
2026-05-12 CSN3193 SZX → PKX May 12, 04:55 UTCMay 12, 05:15 UTC20m
2026-05-09 CSN318 GMP → PKX May 9, 05:00 UTCMay 9, 05:20 UTC20m
2026-05-09 CSN317 PKX → GMP May 9, 02:40 UTCMay 9, 03:00 UTC20m
2026-05-08 CSN5098 ALA → PKX May 8, 21:25 UTCMay 8, 21:40 UTC15m
2026-05-08 CSN5097 PKX → ALA May 8, 10:49 UTCMay 8, 11:14 UTC25m
2026-05-08 CSN356 HKG → PKX May 8, 06:14 UTCMay 8, 06:39 UTC25m
2026-05-08 CSN355 PKX → HKG May 8, 03:19 UTCMay 8, 03:44 UTC25m
2026-05-05 CSN5004 VCV → MHV May 5, 03:00 UTCMay 5, 03:15 UTC15m
2026-05-04 CSN5003 PKX → FRU May 4, 15:45 UTCMay 4, 16:05 UTC20m
2026-05-02 CSN5098 ALA → PKX May 2, 21:35 UTCMay 2, 21:45 UTC10m
2026-05-02 CSN5097 PKX → ALA May 2, 10:55 UTCMay 2, 11:20 UTC25m
2026-05-01 CSN318 GMP → PKX May 1, 04:40 UTCMay 1, 05:00 UTC20m
2026-05-01 CSN317 PKX → GMP May 1, 02:25 UTCMay 1, 02:50 UTC25m
2026-04-30 CSN5098 ALA → PKX Apr 30, 21:25 UTCApr 30, 21:40 UTC15m
2026-04-30 CSN5097 PKX → ALA Apr 30, 10:50 UTCApr 30, 11:05 UTC15m
2026-04-30 CSN356 HKG → PKX Apr 30, 05:55 UTCApr 30, 06:15 UTC20m
2026-04-30 CSN355 PKX → HKG Apr 30, 03:15 UTCApr 30, 03:45 UTC30m
2026-04-29 CSN318 GMP → PKX Apr 29, 05:05 UTCApr 29, 05:30 UTC25m
2026-04-29 CSN317 PKX → GMP Apr 29, 02:55 UTCApr 29, 03:19 UTC25m
2026-04-28 CSN6028 TAS → PKX Apr 28, 23:35 UTCApr 28, 23:50 UTC15m
2026-04-28 CSN318 GMP → PKX Apr 28, 05:00 UTCApr 28, 05:25 UTC25m
2026-04-28 CSN317 PKX → GMP Apr 28, 02:35 UTCApr 28, 03:00 UTC25m
2026-04-25 CSN318 GMP → PKX Apr 25, 04:40 UTCApr 25, 05:00 UTC20m

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-327H page for operator, model, and routing details .

Mode-S 781CD4 frequently asked

What is Mode-S code 781CD4?
781CD4 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-327H.
Where is Mode-S 781CD4 registered?
Mode-S code 781CD4 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781CD4 broadcasting right now?
No active broadcast right now. Last signal was 10h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781CD4, octal 36016324, decimal 7,871,700.
What flights does 781CD4 operate?
Mode-S 781CD4 has broadcast 15 distinct callsigns, including CSN5098, CSN5097, CSN355, CSN356, CSN318.