Apparatus

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sensors Mode-S transponder

7817B7

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-30AL · AIRBUS A-350-900

Hex
7817B7
Octal
36013667
Decimal
7,870,391
Country
CN
Tail
B-30AL
Type
A359
No current signal · last broadcast Jul 26, 14:50 UTC
Flights observed
123
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 14:50 UTC

Last known position

Most recent position reported by Mode-S 7817B7.

Country allocation

The ICAO 24-bit address 7817B7 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
CSN326 China Southern Airlines 17 2026-07-23
CSN308 China Southern Airlines 11 2026-07-26
CSN306 - 11 2026-07-20
CSN307 China Southern Airlines 9 2026-07-25
CSN354 China Southern Airlines 8 2026-07-18
CSN325 China Southern Airlines 8 2026-07-22
CSN305 China Southern Airlines 8 2026-07-20
CSN382 China Southern Airlines 6 2026-05-01
CSN381 China Southern Airlines 6 2026-04-30
CSN353 China Southern Airlines 6 2026-07-25
CSN8028 - 5 2026-07-17
CSN8032 China Southern Airlines 4 2026-06-28
CSN8031 - 4 2026-06-27
CSN8027 - 4 2026-07-17
CSN8004 China Southern Airlines 2 2026-07-21
CSN8003 China Southern Airlines 2 2026-07-21
CSN382D China Southern Airlines 2 2026-04-18
CSN338 - 2 2026-06-19
CSN337 - 2 2026-06-19
CSN3523 China Southern Airlines 1 2026-06-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN308 AMS → CAN Jul 26, 11:45 UTCJul 26, 14:50 UTC3h 5m
2026-07-25 CSN307 CAN → AMS Jul 25, 21:25 UTCJul 26, 04:05 UTC6h 40m
2026-07-25 CSN307 CAN → AMS Jul 25, 06:15 UTCJul 26, 04:05 UTC21h 50m
2026-07-25 CSN353 CAN → SIN Jul 25, 01:20 UTCJul 25, 04:20 UTC3h 0m
2026-07-24 CSN308 AMS → CAN Jul 24, 12:00 UTCJul 24, 20:35 UTC8h 35m
2026-07-23 CSN307 CAN → AMS Jul 23, 21:30 UTCJul 24, 04:05 UTC6h 35m
2026-07-23 CSN326 SYD → CAN Jul 23, 09:00 UTCJul 23, 09:20 UTC20m
2026-07-23 CSN326 SYD → CAN Jul 23, 00:20 UTCJul 23, 08:15 UTC7h 55m
2026-07-22 CSN325 CAN → SYD Jul 22, 13:15 UTCJul 22, 21:30 UTC8h 15m
2026-07-21 CSN8004 SVO → WUH Jul 21, 19:15 UTCJul 21, 23:10 UTC3h 55m
2026-07-21 CSN8003 WUH → SVO Jul 21, 12:25 UTCJul 21, 16:55 UTC4h 30m
2026-07-20 CSN306 - Jul 20, 20:10 UTCJul 20, 20:40 UTC30m
2026-07-20 CSN306 - Jul 20, 12:20 UTCJul 20, 19:25 UTC7h 5m
2026-07-20 CSN306 - Jul 20, 09:45 UTCJul 20, 09:55 UTC10m
2026-07-20 CSN305 CAN → AKL Jul 20, 03:20 UTCJul 20, 03:35 UTC15m
2026-07-19 CSN305 CAN → AKL Jul 19, 17:25 UTCJul 20, 01:15 UTC7h 50m
2026-07-19 CSN326 SYD → CAN Jul 19, 08:35 UTCJul 19, 08:55 UTC20m
2026-07-19 CSN326 SYD → CAN Jul 19, 00:20 UTCJul 19, 07:50 UTC7h 30m
2026-07-18 CSN325 CAN → SYD Jul 18, 13:40 UTCJul 18, 22:10 UTC8h 30m
2026-07-18 CSN354 SIN → CAN Jul 18, 10:25 UTCJul 18, 10:50 UTC25m
2026-07-18 CSN354 SIN → CAN Jul 18, 07:30 UTCJul 18, 07:55 UTC25m
2026-07-18 CSN353 CAN → SIN Jul 18, 03:30 UTCJul 18, 03:55 UTC25m
2026-07-17 CSN8028 - Jul 17, 13:29 UTCJul 17, 14:50 UTC1h 20m
2026-07-17 CSN8027 - Jul 17, 06:20 UTCJul 17, 10:40 UTC4h 20m
2026-07-16 CSN354 - Jul 16, 09:25 UTCJul 16, 09:45 UTC20m
2026-07-16 CSN354 - Jul 16, 06:20 UTCJul 16, 06:45 UTC25m
2026-07-16 CSN353 - Jul 16, 01:25 UTCJul 16, 04:40 UTC3h 15m
2026-07-15 CSN308 - Jul 15, 11:40 UTCJul 15, 17:50 UTC6h 10m
2026-07-14 CSN307 - Jul 14, 21:30 UTCJul 15, 03:55 UTC6h 24m
2026-07-14 CSN354 - Jul 14, 10:00 UTCJul 14, 10:10 UTC10m
2026-07-14 CSN354 - Jul 14, 06:50 UTCJul 14, 07:15 UTC25m
2026-07-14 CSN353 - Jul 14, 01:40 UTCJul 14, 04:55 UTC3h 15m
2026-07-13 CSN306 - Jul 13, 20:50 UTCJul 13, 21:05 UTC15m
2026-07-13 CSN306 - Jul 13, 09:25 UTCJul 13, 20:00 UTC10h 35m
2026-07-13 CSN305 - Jul 13, 02:55 UTCJul 13, 03:15 UTC20m
2026-07-12 CSN305 - Jul 12, 17:15 UTCJul 13, 01:05 UTC7h 50m
2026-07-11 CSN308 - Jul 11, 11:55 UTCJul 11, 18:05 UTC6h 10m
2026-07-10 CSN307 - Jul 10, 22:20 UTCJul 11, 04:35 UTC6h 15m
2026-07-06 CSN354 - Jul 6, 09:05 UTCJul 6, 09:30 UTC25m
2026-07-06 CSN354 - Jul 6, 06:00 UTCJul 6, 06:20 UTC20m
2026-07-06 CSN353 - Jul 6, 03:40 UTCJul 6, 04:10 UTC30m
2026-07-06 CSN353 - Jul 6, 00:55 UTCJul 6, 01:10 UTC15m
2026-07-05 CSN306 AKL → CAN Jul 5, 20:40 UTCJul 5, 20:55 UTC15m
2026-07-05 CSN306 AKL → CAN Jul 5, 09:35 UTCJul 5, 19:55 UTC10h 20m
2026-07-04 CSN305 - Jul 4, 17:35 UTCJul 5, 03:25 UTC9h 50m
2026-07-04 CSN326 - Jul 4, 09:05 UTCJul 4, 09:25 UTC20m
2026-07-04 CSN326 - Jul 4, 00:30 UTCJul 4, 08:10 UTC7h 40m
2026-07-03 CSN325 - Jul 3, 13:35 UTCJul 3, 21:55 UTC8h 20m
2026-07-03 CSN326 - Jul 3, 00:15 UTCJul 3, 07:45 UTC7h 30m
2026-07-02 CSN325 - Jul 2, 13:15 UTCJul 2, 21:35 UTC8h 20m

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-30AL page for operator, model, and routing details .

Mode-S 7817B7 frequently asked

What is Mode-S code 7817B7?
7817B7 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-30AL.
Where is Mode-S 7817B7 registered?
Mode-S code 7817B7 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7817B7 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 14:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7817B7, octal 36013667, decimal 7,870,391.
What flights does 7817B7 operate?
Mode-S 7817B7 has broadcast 20 distinct callsigns, including CSN326, CSN308, CSN306, CSN307, CSN354.