Apparatus

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sensors Mode-S transponder

7817B4

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20DM · BOEING 777-300ER

Hex
7817B4
Octal
36013664
Decimal
7,870,388
Country
CN
Tail
B-20DM
Type
B77W
No current signal · last broadcast 2d ago
Flights observed
122
Distinct callsigns
20
Country
CN
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 7817B4.

Country allocation

The ICAO 24-bit address 7817B4 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
CSN3098 - 13 2026-07-06
CSN3097 - 10 2026-07-06
CSN328 - 9 2026-06-15
CSN327 - 9 2026-06-14
CSN330 - 8 2026-07-11
CSN660 - 6 2026-07-07
CSN659 - 6 2026-07-06
CSN386 - 6 2026-07-10
CSN385 - 6 2026-07-04
CSN348 - 6 2026-07-09
CSN329 - 6 2026-07-10
CSN312 - 6 2026-07-03
CSN303 China Southern Airlines 6 2026-04-18
CSN657 - 5 2026-07-04
CSN304 China Southern Airlines 5 2026-04-18
CSN311 - 4 2026-07-02
CSN347 - 3 2026-07-08
CSN6890 - 2 2026-06-29
CSN658 - 2 2026-07-05
CSN699 China Southern Airlines 1 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 CSN330 - Jul 11, 07:55 UTCJul 11, 17:50 UTC9h 55m
2026-07-10 CSN329 - Jul 10, 19:15 UTCJul 11, 04:50 UTC9h 36m
2026-07-10 CSN386 - Jul 10, 07:05 UTCJul 10, 08:30 UTC1h 25m
2026-07-09 CSN348 - Jul 9, 10:30 UTCJul 10, 05:00 UTC18h 30m
2026-07-08 CSN347 - Jul 8, 22:20 UTCJul 9, 05:05 UTC6h 45m
2026-07-07 CSN660 - Jul 7, 08:00 UTCJul 7, 19:10 UTC11h 10m
2026-07-06 CSN659 - Jul 6, 18:20 UTCJul 7, 04:45 UTC10h 25m
2026-07-06 CSN3098 - Jul 6, 07:15 UTCJul 6, 08:25 UTC1h 10m
2026-07-06 CSN3097 - Jul 6, 03:55 UTCJul 6, 05:30 UTC1h 35m
2026-07-05 CSN658 - Jul 5, 07:30 UTCJul 5, 18:35 UTC11h 5m
2026-07-04 CSN657 - Jul 4, 17:40 UTCJul 5, 03:40 UTC10h 0m
2026-07-04 CSN657 - Jul 4, 07:05 UTCJul 5, 03:40 UTC20h 35m
2026-07-04 CSN657 - Jul 4, 06:55 UTCJul 5, 03:40 UTC20h 45m
2026-07-04 CSN385 - Jul 4, 03:25 UTCJul 4, 04:55 UTC1h 30m
2026-07-03 CSN312 - Jul 3, 05:45 UTCJul 3, 18:20 UTC12h 35m
2026-07-02 CSN311 - Jul 2, 13:35 UTCJul 3, 01:55 UTC12h 20m
2026-07-01 CSN330 - Jul 1, 07:40 UTCJul 1, 18:10 UTC10h 30m
2026-06-30 CSN329 - Jun 30, 19:15 UTCJul 1, 04:15 UTC9h 0m
2026-06-29 CSN6890 - Jun 29, 10:00 UTCJun 29, 10:10 UTC10m
2026-06-28 CSN6890 - Jun 28, 10:10 UTCJun 28, 10:24 UTC15m
2026-06-27 CSN3098 - Jun 27, 07:19 UTCJun 27, 07:49 UTC30m
2026-06-27 CSN3097 - Jun 27, 03:49 UTCJun 27, 05:29 UTC1h 40m
2026-06-26 CSN660 - Jun 26, 08:40 UTCJun 26, 20:34 UTC11h 55m
2026-06-25 CSN659 - Jun 25, 20:14 UTCJun 26, 05:55 UTC9h 40m
2026-06-21 CSN312 - Jun 21, 17:39 UTCJun 22, 14:49 UTC21h 10m
2026-06-21 CSN312 - Jun 21, 05:35 UTCJun 21, 08:30 UTC2h 55m
2026-06-20 CSN311 - Jun 20, 13:29 UTCJun 21, 01:55 UTC12h 25m
2026-06-15 CSN328 - Jun 15, 07:05 UTCJun 15, 18:50 UTC11h 45m
2026-06-14 CSN327 - Jun 14, 17:00 UTCJun 15, 03:45 UTC10h 45m
2026-06-12 CSN386 HND → CAN Jun 12, 07:00 UTCJun 12, 08:35 UTC1h 35m
2026-06-12 CSN385 CAN → HND Jun 12, 03:30 UTCJun 12, 05:05 UTC1h 35m
2026-06-11 CSN328 LAX → CAN Jun 11, 07:05 UTCJun 11, 19:10 UTC12h 5m
2026-06-10 CSN327 CAN → LAX Jun 10, 16:15 UTCJun 11, 01:55 UTC9h 40m
2026-06-10 CSN3098 TPE → CAN Jun 10, 07:15 UTCJun 10, 08:35 UTC1h 20m
2026-06-10 CSN3097 CAN → TPE Jun 10, 03:50 UTCJun 10, 05:15 UTC1h 25m
2026-06-08 CSN386 HND → CAN Jun 8, 07:05 UTCJun 8, 08:25 UTC1h 20m
2026-06-08 CSN385 CAN → HND Jun 8, 03:20 UTCJun 8, 04:25 UTC1h 5m
2026-06-06 CSN330 YVR → CAN Jun 6, 07:55 UTCJun 6, 17:49 UTC9h 55m
2026-06-05 CSN329 CAN → YVR Jun 5, 19:30 UTCJun 6, 04:25 UTC8h 55m
2026-06-05 CSN386 HND → CAN Jun 5, 07:00 UTCJun 5, 08:25 UTC1h 25m
2026-06-05 CSN385 CAN → HND Jun 5, 04:20 UTCJun 5, 05:25 UTC1h 5m
2026-06-04 CSN328 LAX → CAN Jun 4, 07:20 UTCJun 4, 18:55 UTC11h 35m
2026-06-03 CSN327 CAN → LAX Jun 3, 16:15 UTCJun 4, 02:10 UTC9h 55m
2026-05-30 CSN600 JFK → CAN May 30, 05:10 UTCMay 30, 18:20 UTC13h 10m
2026-05-28 CSN699 CAN → JFK May 28, 13:00 UTCMay 29, 01:45 UTC12h 45m
2026-05-27 CSN330 YVR → CAN May 27, 20:30 UTCMay 27, 20:40 UTC10m
2026-05-27 CSN330 YVR → CAN May 27, 07:40 UTCMay 27, 18:05 UTC10h 25m
2026-05-26 CSN329 CAN → YVR May 26, 19:30 UTCMay 27, 04:39 UTC9h 10m
2026-05-25 CSN386 HND → CAN May 25, 07:15 UTCMay 25, 08:25 UTC1h 10m
2026-05-25 CSN385 CAN → HND May 25, 04:00 UTCMay 25, 05:20 UTC1h 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-20DM page for operator, model, and routing details .

Mode-S 7817B4 frequently asked

What is Mode-S code 7817B4?
7817B4 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20DM.
Where is Mode-S 7817B4 registered?
Mode-S code 7817B4 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7817B4 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7817B4, octal 36013664, decimal 7,870,388.
What flights does 7817B4 operate?
Mode-S 7817B4 has broadcast 20 distinct callsigns, including CSN3098, CSN3097, CSN328, CSN327, CSN330.