Apparatus

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sensors Mode-S transponder

7815A4

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-207Z · BOEING 737-800

Hex
7815A4
Octal
36012644
Decimal
7,869,860
Country
CN
Tail
B-207Z
Type
B738
No current signal · last broadcast 4h ago
Flights observed
53
Distinct callsigns
20
Country
CN
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 7815A4.

Country allocation

The ICAO 24-bit address 7815A4 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
CUA869 - 4 2026-07-11
CUA5630 - 4 2026-07-20
CUA5396 China United Airlines 4 2026-04-28
CUA2819 - 4 2026-07-11
CUA5595 - 3 2026-07-09
CUA880 China United Airlines 2 2026-06-25
CUA879 China United Airlines 2 2026-06-24
CUA870 - 2 2026-07-11
CUA5652 - 2 2026-06-28
CUA5651 - 2 2026-06-28
CUA5602 - 2 2026-07-19
CUA5395 China United Airlines 2 2026-04-22
CUA5330 China United Airlines 2 2026-04-25
CUA2128 - 2 2026-07-18
CUA5737 China United Airlines 1 2026-06-04
CUA5685 - 1 2026-06-22
CUA5626 - 1 2026-07-10
CUA5625 - 1 2026-07-10
CUA5597 China United Airlines 1 2026-04-29
CUA5596 - 1 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-20 CUA5630 - Jul 20, 17:10 UTCJul 20, 17:20 UTC10m
2026-07-19 CUA5602 - Jul 19, 14:55 UTCJul 19, 15:15 UTC20m
2026-07-18 CUA2128 - Jul 18, 00:50 UTCJul 18, 01:00 UTC10m
2026-07-17 CUA2817 - Jul 17, 00:30 UTCJul 17, 03:45 UTC3h 15m
2026-07-15 CUA5630 - Jul 15, 13:45 UTCJul 15, 14:00 UTC15m
2026-07-13 CUA2128 - Jul 13, 00:50 UTCJul 13, 01:05 UTC15m
2026-07-11 CUA2819 - Jul 11, 23:40 UTCJul 11, 23:55 UTC15m
2026-07-11 CUA870 - Jul 11, 13:15 UTCJul 11, 13:35 UTC20m
2026-07-11 CUA869 - Jul 11, 11:15 UTCJul 11, 11:40 UTC25m
2026-07-11 CUA2818 - Jul 11, 03:25 UTCJul 11, 03:35 UTC10m
2026-07-10 CUA5626 - Jul 10, 12:50 UTCJul 10, 13:05 UTC15m
2026-07-10 CUA5625 - Jul 10, 05:45 UTCJul 10, 05:55 UTC10m
2026-07-10 CUA5596 - Jul 10, 03:05 UTCJul 10, 03:15 UTC10m
2026-07-09 CUA5595 - Jul 9, 23:40 UTCJul 9, 23:55 UTC15m
2026-07-09 CUA5630 - Jul 9, 13:45 UTCJul 9, 13:55 UTC10m
2026-07-08 CUA2126 - Jul 8, 02:25 UTCJul 8, 02:40 UTC15m
2026-07-04 CUA2819 - Jul 4, 23:40 UTCJul 4, 23:55 UTC15m
2026-06-28 CUA5652 - Jun 28, 14:59 UTCJun 28, 15:14 UTC15m
2026-06-28 CUA5651 - Jun 28, 07:29 UTCJun 28, 07:50 UTC20m
2026-06-25 CUA2819 - Jun 25, 05:05 UTCJun 26, 00:05 UTC19h 0m
2026-06-25 CUA880 TAE → DSN Jun 25, 04:35 UTCJun 26, 00:05 UTC19h 30m
2026-06-24 CUA879 DSN → TAE Jun 24, 13:24 UTCJun 25, 03:10 UTC13h 45m
2026-06-24 CUA869 DSN → ICN Jun 24, 11:34 UTCJun 24, 11:54 UTC20m
2026-06-22 CUA5595 PKX → DBC Jun 22, 23:39 UTCJun 22, 23:50 UTC10m
2026-06-22 CUA5685 - Jun 22, 07:54 UTCJun 22, 08:29 UTC35m
2026-06-20 CUA2320 - Jun 20, 10:44 UTCJun 20, 11:05 UTC20m
2026-06-20 CUA2319 - Jun 20, 06:54 UTCJun 20, 07:09 UTC15m
2026-06-14 CUA880 TAE → DSN Jun 14, 05:00 UTCJun 14, 05:35 UTC35m
2026-06-13 CUA879 DSN → TAE Jun 13, 13:10 UTCJun 14, 03:35 UTC14h 25m
2026-06-13 CUA869 DSN → ICN Jun 13, 11:25 UTCJun 13, 11:45 UTC20m
2026-06-11 CUA5595 PKX → DBC Jun 11, 23:45 UTCJun 12, 00:00 UTC15m
2026-06-10 CUA870 ICN → DSN Jun 10, 13:15 UTCJun 10, 14:45 UTC1h 30m
2026-06-10 CUA869 DSN → ICN Jun 10, 10:55 UTCJun 10, 11:20 UTC25m
2026-06-08 CUA2819 DSN → NKG Jun 8, 23:45 UTCJun 9, 00:05 UTC20m
2026-06-04 CUA5737 FUO → SHA Jun 4, 23:40 UTCJun 5, 00:45 UTC1h 5m
2026-05-28 CUA5529 - May 28, 10:30 UTCMay 28, 10:45 UTC15m
2026-05-18 CUA5290 - May 18, 23:20 UTCMay 19, 04:30 UTC5h 10m
2026-05-17 CUA5630 XNN → PKX May 17, 13:45 UTCMay 17, 14:01 UTC15m
2026-05-07 CUA5602 YZY → PKX May 7, 14:05 UTCMay 7, 14:25 UTC20m
2026-04-29 CUA5597 PKX → JMU Apr 29, 09:50 UTCApr 29, 10:05 UTC15m
2026-04-28 CUA5396 DSN → PKX Apr 28, 14:50 UTCApr 28, 15:00 UTC10m
2026-04-28 CUA5396 DSN → PKX Apr 28, 10:20 UTCApr 28, 10:35 UTC15m
2026-04-25 CUA5330 DSN → PKX Apr 25, 05:40 UTCApr 25, 05:55 UTC15m
2026-04-24 CUA5330 DSN → PKX Apr 24, 05:35 UTCApr 24, 05:55 UTC20m
2026-04-22 CUA5396 DSN → PKX Apr 22, 15:45 UTCApr 22, 16:00 UTC15m
2026-04-22 CUA5396 DSN → PKX Apr 22, 11:20 UTCApr 22, 11:30 UTC10m
2026-04-22 CUA5395 DSN → ZUH Apr 22, 09:45 UTCApr 22, 09:55 UTC10m
2026-04-22 CUA5395 DSN → ZUH Apr 22, 03:25 UTCApr 22, 03:45 UTC20m
2026-04-21 CUA5006 - Apr 21, 13:05 UTCApr 21, 13:20 UTC15m
2026-04-21 CUA5005 - Apr 21, 11:10 UTCApr 21, 11:30 UTC20m

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-207Z page for operator, model, and routing details .

Mode-S 7815A4 frequently asked

What is Mode-S code 7815A4?
7815A4 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-207Z.
Where is Mode-S 7815A4 registered?
Mode-S code 7815A4 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7815A4 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7815A4, octal 36012644, decimal 7,869,860.
What flights does 7815A4 operate?
Mode-S 7815A4 has broadcast 20 distinct callsigns, including CUA869, CUA5630, CUA5396, CUA2819, CUA5595.