Apparatus

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sensors Mode-S transponder

7813B4

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-1089 · AIRBUS A-321neo

Hex
7813B4
Octal
36011664
Decimal
7,869,364
Country
CN
Tail
B-1089
Type
A21N
No current signal · last broadcast Jul 26, 15:35 UTC
Flights observed
206
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 15:35 UTC

Last known position

Most recent position reported by Mode-S 7813B4.

Country allocation

The ICAO 24-bit address 7813B4 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
CSN352 China Southern Airlines 15 2026-07-26
CSN3040 - 15 2026-07-04
CSN5015 - 13 2026-07-13
CSN363 - 12 2026-07-12
CSN3039 - 11 2026-07-04
CSN362 China Southern Airlines 10 2026-07-23
CSN361 China Southern Airlines 10 2026-07-22
CSN351 China Southern Airlines 9 2026-07-25
CSN5016 - 8 2026-07-13
CSN3044 - 8 2026-07-21
CSN8099 China Southern Airlines 7 2026-07-24
CSN364 - 6 2026-07-12
CSN357 - 6 2026-07-16
CSN340 China Southern Airlines 6 2026-07-17
CSN339 - 6 2026-07-16
CSN3043 - 6 2026-07-21
CSN8100 - 5 2026-06-26
CSN358 - 5 2026-07-16
CSN3062 - 5 2026-06-29
CSN8484 China Southern Airlines 4 2026-05-31

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN352 SIN → CAN Jul 26, 00:10 UTCJul 26, 15:35 UTC15h 26m
2026-07-25 CSN351 CAN → SIN Jul 25, 15:55 UTCJul 25, 16:20 UTC25m
2026-07-25 CSN351 CAN → SIN Jul 25, 12:55 UTCJul 25, 13:15 UTC20m
2026-07-25 CSN6316 CAN → SHE Jul 25, 02:10 UTCJul 25, 06:20 UTC4h 10m
2026-07-24 CSN3635 CAN → YIW Jul 24, 07:05 UTCJul 24, 15:25 UTC8h 20m
2026-07-24 CSN8099 CAN → BKK Jul 24, 03:10 UTCJul 24, 05:20 UTC2h 10m
2026-07-23 CSN3822 NKG → CAN Jul 23, 13:20 UTCJul 23, 13:30 UTC10m
2026-07-23 CSN362 BKK → CAN Jul 23, 01:30 UTCJul 23, 01:55 UTC25m
2026-07-22 CSN361 CAN → BKK Jul 22, 12:20 UTCJul 22, 14:40 UTC2h 20m
2026-07-21 CSN3044 - Jul 21, 15:35 UTCJul 21, 15:50 UTC15m
2026-07-21 CSN3044 - Jul 21, 12:25 UTCJul 21, 12:55 UTC30m
2026-07-21 CSN3043 - Jul 21, 10:20 UTCJul 21, 10:50 UTC30m
2026-07-21 CSN3043 - Jul 21, 07:30 UTCJul 21, 07:40 UTC10m
2026-07-20 CSN3822 NKG → CAN Jul 20, 12:50 UTCJul 20, 13:00 UTC10m
2026-07-20 CSN352 SIN → CAN Jul 20, 00:25 UTCJul 20, 00:50 UTC25m
2026-07-19 CSN351 - Jul 19, 14:35 UTCJul 19, 14:55 UTC20m
2026-07-18 CSN8988 - Jul 18, 14:30 UTCJul 19, 07:15 UTC16h 45m
2026-07-18 CSN5048 - Jul 18, 11:50 UTCJul 18, 12:00 UTC10m
2026-07-18 CSN5047 - Jul 18, 10:00 UTCJul 18, 10:15 UTC15m
2026-07-17 CSN3044 - Jul 17, 14:20 UTCJul 17, 14:35 UTC15m
2026-07-17 CSN3044 - Jul 17, 11:15 UTCJul 17, 11:39 UTC25m
2026-07-17 CSN3043 - Jul 17, 06:15 UTCJul 17, 09:50 UTC3h 35m
2026-07-17 CSN340 ICN → CAN Jul 17, 01:05 UTCJul 17, 01:49 UTC45m
2026-07-16 CSN339 - Jul 16, 11:50 UTCJul 16, 12:25 UTC35m
2026-07-16 CSN339 - Jul 16, 09:30 UTCJul 16, 09:40 UTC10m
2026-07-16 CSN358 - Jul 16, 05:00 UTCJul 16, 05:15 UTC15m
2026-07-16 CSN357 - Jul 16, 03:20 UTCJul 16, 03:35 UTC15m
2026-07-16 CSN357 - Jul 16, 01:05 UTCJul 16, 01:30 UTC25m
2026-07-15 CSN3044 - Jul 15, 15:50 UTCJul 15, 16:05 UTC15m
2026-07-15 CSN3044 - Jul 15, 12:40 UTCJul 15, 13:05 UTC25m
2026-07-15 CSN3043 - Jul 15, 10:40 UTCJul 15, 11:15 UTC35m
2026-07-15 CSN340 - Jul 15, 01:05 UTCJul 15, 01:50 UTC45m
2026-07-14 CSN339 - Jul 14, 16:05 UTCJul 14, 16:50 UTC45m
2026-07-14 CSN362 - Jul 14, 01:25 UTCJul 14, 03:00 UTC1h 35m
2026-07-13 CSN361 - Jul 13, 14:30 UTCJul 13, 14:40 UTC10m
2026-07-13 CSN5016 - Jul 13, 07:25 UTCJul 13, 08:40 UTC1h 15m
2026-07-13 CSN5015 - Jul 13, 02:40 UTCJul 13, 05:25 UTC2h 45m
2026-07-12 CSN364 - Jul 12, 12:15 UTCJul 12, 12:30 UTC15m
2026-07-12 CSN363 - Jul 12, 10:35 UTCJul 12, 10:55 UTC20m
2026-07-12 CSN363 - Jul 12, 08:35 UTCJul 12, 08:50 UTC15m
2026-07-11 CSN363 - Jul 11, 10:15 UTCJul 11, 10:30 UTC15m
2026-07-11 CSN363 - Jul 11, 08:15 UTCJul 11, 08:30 UTC15m
2026-07-11 - - Jul 11, 06:15 UTCJul 11, 06:25 UTC10m
2026-07-10 CSN5016 - Jul 10, 01:30 UTCJul 10, 13:45 UTC12h 15m
2026-07-09 CSN5015 ZGN → DAC Jul 9, 02:10 UTCJul 9, 05:25 UTC3h 15m
2026-07-08 CSN3044 - Jul 8, 16:25 UTCJul 8, 16:45 UTC20m
2026-07-08 CSN3044 - Jul 8, 13:15 UTCJul 8, 13:45 UTC30m
2026-07-08 CSN3043 - Jul 8, 10:20 UTCJul 8, 11:05 UTC45m
2026-07-08 CSN3043 - Jul 8, 07:25 UTCJul 8, 07:45 UTC20m
2026-07-08 CSN352 - Jul 8, 03:40 UTCJul 8, 04:00 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-1089 page for operator, model, and routing details .

Mode-S 7813B4 frequently asked

What is Mode-S code 7813B4?
7813B4 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-1089.
Where is Mode-S 7813B4 registered?
Mode-S code 7813B4 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7813B4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 15:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7813B4, octal 36011664, decimal 7,869,364.
What flights does 7813B4 operate?
Mode-S 7813B4 has broadcast 20 distinct callsigns, including CSN352, CSN3040, CSN5015, CSN363, CSN3039.