Apparatus

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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 Jul 26, 07:55 UTC
Flights observed
117
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 07:55 UTC

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 20 distinct

Callsign Airline Flights Last seen
CSN355 China Southern Airlines 14 2026-07-18
CSN5097 - 13 2026-07-18
CSN356 - 13 2026-07-18
CSN5098 - 12 2026-07-18
CSN318 China Southern Airlines 11 2026-07-21
CSN317 China Southern Airlines 11 2026-07-21
CSN6714 China Southern Airlines 4 2026-06-29
CSN6028 China Southern Airlines 4 2026-06-27
CSN8844 China Southern Airlines 3 2026-07-25
CSN8010 - 3 2026-07-15
CSN8009 - 3 2026-07-15
CSN8996 China Southern Airlines 2 2026-07-26
CSN8995 China Southern Airlines 2 2026-07-25
CSN5389 China Southern Airlines 2 2026-07-22
CSN3193 China Southern Airlines 2 2026-05-14
CSN8930 - 1 2026-07-19
CSN8917 China Southern Airlines 1 2026-06-23
CSN8909 China Southern Airlines 1 2026-06-25
CSN8871 China Southern Airlines 1 2026-06-07
CSN8852 - 1 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN8996 AAT → PKX Jul 26, 07:35 UTCJul 26, 07:55 UTC20m
2026-07-25 CSN8995 PKX → AAT Jul 25, 23:20 UTCJul 25, 23:35 UTC15m
2026-07-25 CSN8844 KHG → PKX Jul 25, 12:10 UTCJul 25, 12:25 UTC15m
2026-07-25 CSN8843 PKX → KHG Jul 25, 02:00 UTCJul 25, 02:30 UTC30m
2026-07-24 CSN8996 AAT → PKX Jul 24, 07:40 UTCJul 24, 08:05 UTC25m
2026-07-23 CSN8995 PKX → AAT Jul 23, 23:25 UTCJul 23, 23:50 UTC25m
2026-07-23 CSN8844 KHG → PKX Jul 23, 13:15 UTCJul 23, 13:30 UTC15m
2026-07-22 CSN5389 HTN → PKX Jul 22, 15:15 UTCJul 22, 15:25 UTC10m
2026-07-21 CSN318 GMP → PKX Jul 21, 05:15 UTCJul 21, 05:50 UTC35m
2026-07-21 CSN317 PKX → GMP Jul 21, 02:20 UTCJul 21, 03:00 UTC40m
2026-07-19 CSN8930 - Jul 19, 04:55 UTCJul 19, 05:10 UTC15m
2026-07-18 CSN5098 - Jul 18, 21:40 UTCJul 18, 21:55 UTC15m
2026-07-18 CSN5097 - Jul 18, 10:55 UTCJul 18, 11:15 UTC20m
2026-07-18 CSN356 - Jul 18, 06:10 UTCJul 18, 06:30 UTC20m
2026-07-18 CSN355 PKX → HKG Jul 18, 03:15 UTCJul 18, 04:05 UTC50m
2026-07-17 CSN5389 HTN → PKX Jul 17, 12:35 UTCJul 17, 12:50 UTC15m
2026-07-16 CSN318 - Jul 16, 05:00 UTCJul 16, 05:25 UTC25m
2026-07-16 CSN317 - Jul 16, 02:30 UTCJul 16, 02:50 UTC20m
2026-07-15 CSN8010 - Jul 15, 15:45 UTCJul 15, 16:45 UTC1h 0m
2026-07-15 CSN8009 - Jul 15, 12:50 UTCJul 15, 13:50 UTC1h 0m
2026-07-15 CSN5010 - Jul 15, 00:55 UTCJul 15, 01:10 UTC15m
2026-07-14 CSN5009 - Jul 14, 13:25 UTCJul 14, 14:05 UTC40m
2026-07-14 CSN8852 - Jul 14, 03:00 UTCJul 14, 03:10 UTC10m
2026-07-13 CSN6202 - Jul 13, 14:55 UTCJul 13, 15:05 UTC10m
2026-07-13 CSN6218 - Jul 13, 08:15 UTCJul 13, 08:25 UTC10m
2026-07-13 CSN6204 - Jul 13, 00:50 UTCJul 13, 01:05 UTC15m
2026-07-11 CSN8844 - Jul 11, 12:15 UTCJul 11, 12:30 UTC15m
2026-07-09 CSN5098 - Jul 9, 22:00 UTCJul 9, 22:15 UTC15m
2026-07-09 CSN5097 - Jul 9, 10:55 UTCJul 9, 11:20 UTC25m
2026-07-08 CSN318 - Jul 8, 05:10 UTCJul 8, 05:35 UTC25m
2026-07-08 CSN317 - Jul 8, 02:30 UTCJul 8, 02:55 UTC25m
2026-07-07 CSN5098 ALA → PKX Jul 7, 21:20 UTCJul 7, 21:30 UTC10m
2026-07-07 CSN5097 - Jul 7, 11:25 UTCJul 7, 11:50 UTC25m
2026-07-07 CSN356 - Jul 7, 06:35 UTCJul 7, 06:55 UTC20m
2026-07-07 CSN355 - Jul 7, 04:00 UTCJul 7, 04:35 UTC35m
2026-07-05 CSN5311 - Jul 5, 12:20 UTCJul 5, 12:35 UTC15m
2026-07-05 CSN356 - Jul 5, 06:15 UTCJul 5, 06:35 UTC20m
2026-07-05 CSN355 - Jul 5, 03:40 UTCJul 5, 04:20 UTC40m
2026-07-01 CSN356 - Jul 1, 05:45 UTCJul 1, 06:05 UTC20m
2026-07-01 CSN355 - Jul 1, 03:25 UTCJul 1, 03:55 UTC30m
2026-06-30 CSN5097 - Jun 30, 11:30 UTCJun 30, 21:55 UTC10h 25m
2026-06-30 CSN356 - Jun 30, 05:45 UTCJun 30, 06:05 UTC20m
2026-06-30 CSN355 - Jun 30, 03:20 UTCJun 30, 03:50 UTC30m
2026-06-29 CSN6714 PKX → SYX Jun 29, 10:04 UTCJun 29, 10:15 UTC10m
2026-06-27 CSN6028 TAS → PKX Jun 27, 21:59 UTCJun 27, 22:20 UTC20m
2026-06-27 CSN6027 - Jun 27, 09:34 UTCJun 27, 09:44 UTC10m
2026-06-25 CSN8909 PKX → SYX Jun 25, 04:40 UTCJun 25, 07:54 UTC3h 15m
2026-06-23 CSN8917 PKX → CKG Jun 23, 00:50 UTCJun 23, 01:00 UTC10m
2026-06-21 CSN356 - Jun 21, 05:54 UTCJun 21, 06:10 UTC15m
2026-06-21 CSN355 - Jun 21, 03:34 UTCJun 21, 04:14 UTC40m

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 Jul 26, 07:55 UTC.
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 20 distinct callsigns, including CSN355, CSN5097, CSN356, CSN5098, CSN318.