Apparatus

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sensors Mode-S transponder

7813B3

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-1087 · AIRBUS A-321neo

Hex
7813B3
Octal
36011663
Decimal
7,869,363
Country
CN
Tail
B-1087
Type
A21N
No current signal · last broadcast Jul 26, 15:20 UTC
Flights observed
180
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 15:20 UTC

Last known position

Most recent position reported by Mode-S 7813B3.

Country allocation

The ICAO 24-bit address 7813B3 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
CSN339 - 14 2026-07-08
CSN357 - 13 2026-07-11
CSN351 China Southern Airlines 12 2026-07-26
CSN340 - 12 2026-07-09
CSN358 - 10 2026-07-11
CSN352 China Southern Airlines 10 2026-07-25
CSN8484 - 9 2026-07-15
CSN3040 China Southern Airlines 9 2026-07-21
CSN8100 - 7 2026-07-05
CSN361 - 7 2026-07-14
CSN8483 - 6 2026-07-15
CSN8099 - 6 2026-07-05
CSN5015 - 6 2026-07-14
CSN363 China Southern Airlines 6 2026-07-18
CSN362 - 6 2026-07-15
CSN3061 China Southern Airlines 6 2026-07-22
CSN3039 China Southern Airlines 6 2026-07-21
CSN8988 China Southern Airlines 5 2026-07-26
CSN3062 China Southern Airlines 5 2026-07-20
CSN5016 - 4 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN351 CAN → SIN Jul 26, 15:00 UTCJul 26, 15:20 UTC20m
2026-07-26 CSN8988 HLD → CAN Jul 26, 02:30 UTCJul 26, 07:10 UTC4h 41m
2026-07-25 CSN3044 SIN → CAN Jul 25, 14:40 UTCJul 25, 15:10 UTC30m
2026-07-25 CSN3044 SIN → CAN Jul 25, 11:30 UTCJul 25, 12:00 UTC30m
2026-07-25 CSN3043 CAN → SIN Jul 25, 06:35 UTCJul 25, 10:10 UTC3h 35m
2026-07-25 CSN352 SIN → CAN Jul 25, 03:30 UTCJul 25, 03:45 UTC15m
2026-07-25 CSN352 SIN → CAN Jul 25, 00:25 UTCJul 25, 00:50 UTC25m
2026-07-24 CSN351 CAN → SIN Jul 24, 17:00 UTCJul 24, 17:25 UTC25m
2026-07-24 CSN351 CAN → SIN Jul 24, 14:10 UTCJul 24, 14:20 UTC10m
2026-07-24 CSN8988 HLD → CAN Jul 24, 02:40 UTCJul 24, 07:25 UTC4h 45m
2026-07-22 CSN3061 CAN → ICN Jul 22, 03:05 UTCJul 22, 03:15 UTC10m
2026-07-21 CSN3040 SIN → CAN Jul 21, 14:45 UTCJul 21, 15:00 UTC15m
2026-07-21 CSN3040 SIN → CAN Jul 21, 11:35 UTCJul 21, 12:05 UTC30m
2026-07-21 CSN3039 CAN → SIN Jul 21, 09:40 UTCJul 21, 10:15 UTC35m
2026-07-21 CSN3039 CAN → SIN Jul 21, 06:45 UTCJul 21, 07:00 UTC15m
2026-07-20 CSN3062 ICN → CAN Jul 20, 07:55 UTCJul 20, 08:40 UTC45m
2026-07-20 CSN3061 CAN → ICN Jul 20, 05:35 UTCJul 20, 06:15 UTC40m
2026-07-18 CSN364 - Jul 18, 12:40 UTCJul 18, 12:50 UTC10m
2026-07-18 CSN363 CAN → BKK Jul 18, 11:00 UTCJul 18, 11:25 UTC25m
2026-07-17 CSN3906 - Jul 17, 01:59 UTCJul 17, 13:50 UTC11h 50m
2026-07-16 CSN3905 - Jul 16, 14:10 UTCJul 17, 09:04 UTC18h 55m
2026-07-16 CSN8988 - Jul 16, 06:55 UTCJul 17, 02:15 UTC19h 20m
2026-07-16 CSN8988 - Jul 16, 02:50 UTCJul 17, 02:15 UTC23h 25m
2026-07-16 CSN8988 - Jul 16, 02:35 UTCJul 16, 14:25 UTC11h 50m
2026-07-15 CSN8484 - Jul 15, 20:30 UTCJul 15, 20:40 UTC10m
2026-07-15 CSN8484 - Jul 15, 18:05 UTCJul 15, 18:30 UTC25m
2026-07-15 CSN8483 - Jul 15, 16:40 UTCJul 15, 17:05 UTC25m
2026-07-15 CSN362 - Jul 15, 01:40 UTCJul 15, 01:55 UTC15m
2026-07-14 CSN361 - Jul 14, 14:40 UTCJul 14, 15:00 UTC20m
2026-07-14 CSN5016 - Jul 14, 07:35 UTCJul 14, 08:45 UTC1h 10m
2026-07-14 CSN5015 - Jul 14, 04:25 UTCJul 14, 05:40 UTC1h 15m
2026-07-14 CSN5015 - Jul 14, 02:30 UTCJul 14, 02:40 UTC10m
2026-07-13 CSN364 - Jul 13, 12:05 UTCJul 13, 12:15 UTC10m
2026-07-13 CSN363 - Jul 13, 10:15 UTCJul 13, 10:30 UTC15m
2026-07-11 CSN358 - Jul 11, 04:30 UTCJul 11, 04:50 UTC20m
2026-07-11 CSN357 - Jul 11, 00:50 UTCJul 11, 03:20 UTC2h 30m
2026-07-10 CSN8484 - Jul 10, 19:55 UTCJul 10, 20:25 UTC30m
2026-07-10 CSN8484 - Jul 10, 17:45 UTCJul 10, 18:15 UTC30m
2026-07-10 CSN8483 - Jul 10, 16:10 UTCJul 10, 16:25 UTC15m
2026-07-10 CSN8483 - Jul 10, 13:50 UTCJul 10, 14:10 UTC20m
2026-07-10 CSN3062 - Jul 10, 07:55 UTCJul 10, 08:35 UTC40m
2026-07-10 CSN3061 - Jul 10, 05:15 UTCJul 10, 06:00 UTC45m
2026-07-09 CSN340 - Jul 9, 01:15 UTCJul 9, 01:50 UTC35m
2026-07-08 CSN339 - Jul 8, 13:30 UTCJul 8, 14:10 UTC40m
2026-07-08 CSN358 - Jul 8, 04:25 UTCJul 8, 05:55 UTC1h 30m
2026-07-08 CSN357 - Jul 8, 00:55 UTCJul 8, 03:05 UTC2h 10m
2026-07-06 CSN3615 - Jul 6, 02:45 UTCJul 6, 07:25 UTC4h 40m
2026-07-05 CSN8100 - Jul 5, 06:55 UTCJul 5, 07:45 UTC50m
2026-07-05 CSN8099 - Jul 5, 04:30 UTCJul 5, 05:25 UTC55m
2026-07-04 CSN362 - Jul 4, 01:40 UTCJul 4, 10:20 UTC8h 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-1087 page for operator, model, and routing details .

Mode-S 7813B3 frequently asked

What is Mode-S code 7813B3?
7813B3 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-1087.
Where is Mode-S 7813B3 registered?
Mode-S code 7813B3 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7813B3 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 15:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7813B3, octal 36011663, decimal 7,869,363.
What flights does 7813B3 operate?
Mode-S 7813B3 has broadcast 20 distinct callsigns, including CSN339, CSN357, CSN351, CSN340, CSN358.