Apparatus

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sensors Mode-S transponder

7806A1

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-5549 · BOEING 737-800

Hex
7806A1
Octal
36003241
Decimal
7,866,017
Country
CN
Tail
B-5549
Type
B738
No current signal · last broadcast 3d ago
Flights observed
49
Distinct callsigns
12
Country
CN
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S 7806A1.

Country allocation

The ICAO 24-bit address 7806A1 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 12 distinct

Callsign Airline Flights Last seen
CUA5858 China United Airlines 17 2026-05-29
CUA5857 China United Airlines 10 2026-05-29
CUA5876 China United Airlines 3 2026-05-28
CUA5852 China United Airlines 3 2026-05-13
CUA5525 China United Airlines 3 2026-05-06
CUA5519 China United Airlines 3 2026-05-07
CUA5652 - 2 2026-05-02
CUA5651 - 2 2026-05-02
CUA5851 China United Airlines 1 2026-05-01
CUA5811 - 1 2026-05-30
CUA5597 China United Airlines 1 2026-05-20
CUA5526 China United Airlines 1 2026-05-03

Recent flights last 49

DateFlightRouteTakeoffLandingDuration
2026-05-30 CUA5811 - May 30, 08:30 UTCMay 30, 08:45 UTC15m
2026-05-29 CUA5858 SZX → PKX May 29, 03:50 UTCMay 29, 04:05 UTC15m
2026-05-29 CUA5857 PKX → SZX May 29, 02:00 UTCMay 29, 02:20 UTC20m
2026-05-28 CUA5876 ZUH → PKX May 28, 05:15 UTCMay 28, 05:25 UTC10m
2026-05-27 CUA5858 SZX → PKX May 27, 03:50 UTCMay 27, 04:04 UTC15m
2026-05-25 CUA5858 SZX → PKX May 25, 03:45 UTCMay 25, 03:55 UTC10m
2026-05-23 CUA5876 ZUH → PKX May 23, 05:35 UTCMay 23, 05:45 UTC10m
2026-05-22 CUA5858 SZX → PKX May 22, 04:10 UTCMay 22, 04:20 UTC10m
2026-05-22 CUA5857 PKX → SZX May 22, 02:30 UTCMay 22, 02:45 UTC15m
2026-05-21 CUA5858 SZX → PKX May 21, 06:40 UTCMay 21, 06:50 UTC10m
2026-05-21 CUA5857 PKX → SZX May 21, 03:20 UTCMay 21, 04:00 UTC40m
2026-05-20 CUA5597 PKX → JMU May 20, 09:40 UTCMay 20, 09:50 UTC10m
2026-05-18 CUA5858 SZX → PKX May 18, 03:50 UTCMay 18, 04:00 UTC10m
2026-05-18 CUA5857 PKX → SZX May 18, 02:10 UTCMay 18, 02:20 UTC10m
2026-05-16 CUA5858 SZX → PKX May 16, 03:50 UTCMay 16, 04:00 UTC10m
2026-05-13 CUA5852 SZX → PKX May 13, 10:15 UTCMay 13, 10:25 UTC10m
2026-05-11 CUA5858 SZX → PKX May 11, 03:45 UTCMay 11, 03:55 UTC10m
2026-05-10 CUA5876 ZUH → PKX May 10, 05:20 UTCMay 10, 05:30 UTC10m
2026-05-09 CUA5858 SZX → PKX May 9, 03:55 UTCMay 9, 04:05 UTC10m
2026-05-09 CUA5857 PKX → SZX May 9, 02:00 UTCMay 9, 02:10 UTC10m
2026-05-07 CUA5519 PKX → LDS May 7, 23:24 UTCMay 7, 23:34 UTC10m
2026-05-06 CUA5519 PKX → LDS May 6, 23:25 UTCMay 6, 23:40 UTC15m
2026-05-06 CUA5852 SZX → PKX May 6, 10:15 UTCMay 6, 10:25 UTC10m
2026-05-06 CUA5525 PKX → YSQ May 6, 00:20 UTCMay 6, 00:35 UTC15m
2026-05-03 CUA5526 YSQ → PKX May 3, 03:50 UTCMay 3, 04:05 UTC15m
2026-05-03 CUA5525 PKX → YSQ May 3, 00:15 UTCMay 3, 00:30 UTC15m
2026-05-02 CUA5652 - May 2, 13:50 UTCMay 2, 14:05 UTC15m
2026-05-02 CUA5651 - May 2, 06:10 UTCMay 2, 06:35 UTC25m
2026-05-01 CUA5519 PKX → LDS May 1, 23:25 UTCMay 1, 23:35 UTC10m
2026-05-01 CUA5852 SZX → PKX May 1, 10:05 UTCMay 1, 10:15 UTC10m
2026-05-01 CUA5851 PKX → SZX May 1, 08:15 UTCMay 1, 08:25 UTC10m
2026-05-01 CUA5525 PKX → YSQ May 1, 00:20 UTCMay 1, 00:35 UTC15m
2026-04-30 CUA5652 - Apr 30, 13:50 UTCApr 30, 14:05 UTC15m
2026-04-30 CUA5651 - Apr 30, 06:20 UTCApr 30, 06:35 UTC15m
2026-04-27 CUA5858 SZX → PKX Apr 27, 03:55 UTCApr 27, 04:05 UTC10m
2026-04-26 CUA5858 SZX → PKX Apr 26, 03:50 UTCApr 26, 04:00 UTC10m
2026-04-26 CUA5857 PKX → SZX Apr 26, 01:45 UTCApr 26, 02:05 UTC20m
2026-04-25 CUA5857 PKX → SZX Apr 25, 02:00 UTCApr 25, 02:15 UTC15m
2026-04-22 CUA5858 SZX → PKX Apr 22, 03:50 UTCApr 22, 04:00 UTC10m
2026-04-22 CUA5857 PKX → SZX Apr 22, 02:20 UTCApr 22, 02:30 UTC10m
2026-04-20 CUA5858 SZX → PKX Apr 20, 03:55 UTCApr 20, 04:05 UTC10m
2026-04-19 CUA5858 SZX → PKX Apr 19, 04:00 UTCApr 19, 04:10 UTC10m
2026-04-18 CUA5858 SZX → PKX Apr 18, 03:45 UTCApr 18, 03:55 UTC10m
2026-04-18 CUA5857 PKX → SZX Apr 18, 02:10 UTCApr 18, 02:25 UTC15m
2026-04-16 CUA5858 SZX → PKX Apr 16, 03:49 UTCApr 16, 04:00 UTC10m
2026-04-16 CUA5857 PKX → SZX Apr 16, 02:19 UTCApr 16, 02:30 UTC10m
2026-04-15 CUA5858 SZX → PKX Apr 15, 03:55 UTCApr 15, 04:05 UTC10m
2026-04-15 - - Apr 15, 02:10 UTCApr 15, 02:20 UTC10m
2026-04-13 - - Apr 13, 02:20 UTCApr 13, 02:30 UTC10m

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-5549 page for operator, model, and routing details .

Mode-S 7806A1 frequently asked

What is Mode-S code 7806A1?
7806A1 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-5549.
Where is Mode-S 7806A1 registered?
Mode-S code 7806A1 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7806A1 broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7806A1, octal 36003241, decimal 7,866,017.
What flights does 7806A1 operate?
Mode-S 7806A1 has broadcast 12 distinct callsigns, including CUA5858, CUA5857, CUA5876, CUA5852, CUA5525.