Apparatus

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sensors Mode-S transponder

7817FF

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20DV · BOEING 737 MAX 8

Hex
7817FF
Octal
36013777
Decimal
7,870,463
Country
CN
Tail
B-20DV
Type
B38M
No current signal · last broadcast 1d ago
Flights observed
143
Distinct callsigns
20
Country
CN
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 7817FF.

Country allocation

The ICAO 24-bit address 7817FF 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
CXA837 - 15 2026-07-12
CXA824 - 15 2026-06-26
CXA823 - 14 2026-07-07
CXA848 - 10 2026-06-19
CXA838 - 10 2026-07-12
CXA8706 - 7 2026-06-28
CXA847 - 7 2026-06-19
CXA8705 - 6 2026-06-26
CXA892 Xiamen Airlines 5 2026-05-25
CXA8882 Xiamen Airlines 4 2026-06-01
CXA8881 Xiamen Airlines 4 2026-06-01
CXA854 - 4 2026-06-27
CXA853 - 4 2026-06-27
CXA8032 - 4 2026-06-29
CXA898 Xiamen Airlines 3 2026-04-29
CXA8405 - 3 2026-06-23
CXA8371 Xiamen Airlines 3 2026-06-01
CXA897 Xiamen Airlines 2 2026-04-29
CXA8716 - 2 2026-07-09
CXA8380 - 2 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 CXA838 - Jul 12, 16:40 UTCJul 12, 21:05 UTC4h 25m
2026-07-12 CXA837 - Jul 12, 14:50 UTCJul 12, 15:10 UTC20m
2026-07-12 CXA837 - Jul 12, 12:50 UTCJul 12, 13:25 UTC35m
2026-07-12 CXA837 - Jul 12, 10:30 UTCJul 12, 10:40 UTC10m
2026-07-11 CXA838 - Jul 11, 17:55 UTCJul 12, 07:35 UTC13h 40m
2026-07-11 CXA837 - Jul 11, 16:10 UTCJul 11, 16:20 UTC10m
2026-07-11 CXA837 - Jul 11, 05:55 UTCJul 11, 14:45 UTC8h 50m
2026-07-11 CXA8305 - Jul 11, 00:20 UTCJul 11, 00:35 UTC15m
2026-07-10 CXA834 - Jul 10, 10:55 UTCJul 10, 13:10 UTC2h 15m
2026-07-10 CXA833 - Jul 10, 00:05 UTCJul 10, 09:25 UTC9h 20m
2026-07-09 CXA8716 - Jul 9, 02:55 UTCJul 9, 16:50 UTC13h 55m
2026-07-08 CXA8715 - Jul 8, 16:45 UTCJul 8, 17:05 UTC20m
2026-07-08 CXA8716 - Jul 8, 03:10 UTCJul 8, 14:00 UTC10h 50m
2026-07-07 CXA823 - Jul 7, 15:15 UTCJul 7, 15:50 UTC35m
2026-07-05 CXA8484 - Jul 5, 08:20 UTCJul 5, 08:35 UTC15m
2026-07-01 CXA8380 - Jul 1, 04:20 UTCJul 1, 04:30 UTC10m
2026-07-01 CXA8379 - Jul 1, 02:15 UTCJul 1, 02:25 UTC10m
2026-06-29 CXA8032 - Jun 29, 07:55 UTCJun 29, 08:39 UTC45m
2026-06-28 CXA8706 - Jun 28, 14:19 UTCJun 28, 14:30 UTC10m
2026-06-27 CXA838 - Jun 27, 16:59 UTCJun 27, 18:35 UTC1h 35m
2026-06-27 CXA854 - Jun 27, 05:39 UTCJun 27, 07:59 UTC2h 20m
2026-06-27 CXA853 - Jun 27, 01:35 UTCJun 27, 04:05 UTC2h 30m
2026-06-26 CXA8706 - Jun 26, 11:45 UTCJun 26, 11:55 UTC10m
2026-06-26 CXA8705 - Jun 26, 06:45 UTCJun 26, 07:30 UTC45m
2026-06-26 CXA824 - Jun 26, 00:24 UTCJun 26, 00:50 UTC25m
2026-06-25 CXA854 - Jun 25, 05:25 UTCJun 25, 15:20 UTC9h 55m
2026-06-24 CXA853 - Jun 24, 13:54 UTCJun 25, 03:59 UTC14h 5m
2026-06-23 CXA8405 - Jun 23, 13:55 UTCJun 24, 05:59 UTC16h 5m
2026-06-23 CXA8405 - Jun 23, 05:59 UTCJun 24, 01:39 UTC19h 40m
2026-06-23 CXA8405 - Jun 23, 00:35 UTCJun 23, 14:04 UTC13h 30m
2026-06-22 CXA838 - Jun 22, 16:54 UTCJun 22, 18:19 UTC1h 25m
2026-06-22 CXA837 - Jun 22, 14:55 UTCJun 22, 15:05 UTC10m
2026-06-22 CXA854 - Jun 22, 05:29 UTCJun 22, 13:19 UTC7h 50m
2026-06-21 CXA853 - Jun 21, 11:00 UTCJun 22, 03:45 UTC16h 45m
2026-06-21 CXA8705 - Jun 21, 09:20 UTCJun 21, 09:29 UTC10m
2026-06-21 CXA824 - Jun 21, 00:10 UTCJun 21, 00:34 UTC25m
2026-06-20 CXA824 - Jun 20, 00:09 UTCJun 20, 12:19 UTC12h 10m
2026-06-19 CXA848 - Jun 19, 06:54 UTCJun 19, 16:25 UTC9h 30m
2026-06-19 CXA847 - Jun 19, 04:19 UTCJun 19, 04:50 UTC30m
2026-06-18 CXA838 - Jun 18, 16:50 UTCJun 18, 21:20 UTC4h 30m
2026-06-18 CXA837 - Jun 18, 14:55 UTCJun 18, 15:10 UTC15m
2026-06-18 CXA854 - Jun 18, 05:40 UTCJun 18, 13:25 UTC7h 45m
2026-06-18 CXA853 - Jun 18, 03:50 UTCJun 18, 04:20 UTC30m
2026-06-17 CXA8706 - Jun 17, 11:15 UTCJun 17, 11:25 UTC10m
2026-06-17 CXA8705 XMN → PEN Jun 17, 09:35 UTCJun 17, 09:50 UTC15m
2026-06-17 CXA824 - Jun 17, 00:20 UTCJun 17, 06:20 UTC6h 0m
2026-06-16 CXA823 - Jun 16, 15:09 UTCJun 16, 15:35 UTC25m
2026-06-14 CXA8380 SZX → TSN Jun 14, 04:20 UTCJun 14, 04:30 UTC10m
2026-06-13 CXA848 KUL → XMN Jun 13, 07:20 UTCJun 13, 07:50 UTC30m
2026-06-12 CXA838 - Jun 12, 16:55 UTCJun 13, 05:00 UTC12h 5m

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-20DV page for operator, model, and routing details .

Mode-S 7817FF frequently asked

What is Mode-S code 7817FF?
7817FF is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20DV.
Where is Mode-S 7817FF registered?
Mode-S code 7817FF is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7817FF broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7817FF, octal 36013777, decimal 7,870,463.
What flights does 7817FF operate?
Mode-S 7817FF has broadcast 20 distinct callsigns, including CXA837, CXA824, CXA823, CXA848, CXA838.