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 12h ago
Flights observed
173
Distinct callsigns
20
Country
CN
Last broadcast
12h ago

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
CSN3040 - 15 2026-07-04
CSN5015 - 13 2026-07-13
CSN352 - 13 2026-07-08
CSN363 - 12 2026-07-12
CSN3039 - 11 2026-07-04
CSN362 - 9 2026-07-14
CSN361 - 9 2026-07-13
CSN5016 - 8 2026-07-13
CSN8099 - 6 2026-06-26
CSN364 - 6 2026-07-12
CSN351 - 6 2026-07-07
CSN8100 - 5 2026-06-26
CSN3062 - 5 2026-06-29
CSN8484 China Southern Airlines 4 2026-05-31
CSN358 China Southern Airlines 4 2026-05-29
CSN357 China Southern Airlines 4 2026-05-29
CSN354 China Southern Airlines 4 2026-04-29
CSN340 - 4 2026-06-13
CSN3061 - 4 2026-06-29
CSN8483 China Southern Airlines 3 2026-05-31

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-08 CSN352 - Jul 8, 00:30 UTCJul 8, 01:00 UTC30m
2026-07-07 CSN351 - Jul 7, 02:15 UTCJul 7, 15:25 UTC13h 10m
2026-07-06 CSN6377 - Jul 6, 16:05 UTCJul 7, 15:00 UTC22h 55m
2026-07-06 CSN6377 - Jul 6, 09:05 UTCJul 7, 07:10 UTC22h 5m
2026-07-06 CSN6377 - Jul 6, 08:55 UTCJul 7, 07:00 UTC22h 5m
2026-07-06 CSN352 - Jul 6, 03:45 UTCJul 6, 04:00 UTC15m
2026-07-06 CSN352 - Jul 6, 00:35 UTCJul 6, 01:00 UTC25m
2026-07-05 CSN351 - Jul 5, 14:30 UTCJul 5, 15:00 UTC30m
2026-07-05 CSN351 - Jul 5, 11:50 UTCJul 5, 12:00 UTC10m
2026-07-05 CSN8987 - Jul 5, 02:20 UTCJul 5, 07:10 UTC4h 50m
2026-07-04 CSN3040 - Jul 4, 18:25 UTCJul 4, 18:45 UTC20m
2026-07-04 CSN3040 - Jul 4, 15:25 UTCJul 4, 15:45 UTC20m
2026-07-04 CSN3039 - Jul 4, 13:20 UTCJul 4, 13:50 UTC30m
2026-07-03 CSN6378 - Jul 3, 03:05 UTCJul 3, 07:30 UTC4h 25m
2026-07-02 CSN6378 - Jul 2, 12:45 UTCJul 3, 07:30 UTC18h 45m
2026-07-02 CSN6342 - Jul 2, 08:10 UTCJul 3, 03:25 UTC19h 15m
2026-07-02 CSN6342 - Jul 2, 01:15 UTCJul 2, 13:00 UTC11h 45m
2026-07-01 CSN6342 - Jul 1, 15:25 UTCJul 2, 13:00 UTC21h 35m
2026-06-30 CSN362 BKK → CAN Jun 30, 01:30 UTCJun 30, 08:00 UTC6h 30m
2026-06-29 CSN361 CAN → BKK Jun 29, 12:45 UTCJun 29, 14:44 UTC2h 0m
2026-06-29 CSN3062 - Jun 29, 07:50 UTCJun 29, 08:35 UTC45m
2026-06-29 CSN3061 - Jun 29, 05:09 UTCJun 29, 05:50 UTC40m
2026-06-28 CSN5016 - Jun 28, 08:19 UTCJun 28, 09:34 UTC1h 15m
2026-06-28 CSN5015 - Jun 28, 04:05 UTCJun 28, 06:44 UTC2h 40m
2026-06-27 CSN362 BKK → CAN Jun 27, 01:44 UTCJun 27, 03:20 UTC1h 35m
2026-06-26 CSN361 CAN → BKK Jun 26, 14:39 UTCJun 26, 16:39 UTC2h 0m
2026-06-26 CSN8100 - Jun 26, 06:45 UTCJun 26, 08:20 UTC1h 35m
2026-06-26 CSN8099 - Jun 26, 03:29 UTCJun 26, 05:05 UTC1h 35m
2026-06-24 CSN362 BKK → CAN Jun 24, 01:34 UTCJun 24, 03:10 UTC1h 35m
2026-06-23 CSN361 CAN → BKK Jun 23, 12:29 UTCJun 23, 14:44 UTC2h 15m
2026-06-23 CSN5016 - Jun 23, 07:25 UTCJun 23, 08:00 UTC35m
2026-06-23 CSN5015 - Jun 23, 02:09 UTCJun 23, 05:24 UTC3h 15m
2026-06-22 CSN5016 - Jun 22, 07:34 UTCJun 22, 08:04 UTC30m

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 12h ago.
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 CSN3040, CSN5015, CSN352, CSN363, CSN3039.