Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

7804A1

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-5403 · BOEING 737-800

Hex
7804A1
Octal
36002241
Decimal
7,865,505
Country
CN
Tail
B-5403
Type
B738
No current signal · last broadcast 8h ago
Flights observed
121
Distinct callsigns
20
Country
CN
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S 7804A1.

Country allocation

The ICAO 24-bit address 7804A1 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
YZR7579 - 19 2026-07-17
YZR7537 - 12 2026-07-16
YZR7566 - 11 2026-07-15
YZR7526 - 7 2026-06-13
YZR7525 Yangtze River Express 7 2026-06-12
YZR7580 Yangtze River Express 5 2026-06-06
YZR7574 - 5 2026-07-15
YZR7573 - 5 2026-07-15
YZR7538 - 5 2026-07-17
YZR7535 - 5 2026-06-27
YZR7565 - 4 2026-06-27
YZR7532 - 4 2026-06-22
YZR7596 - 3 2026-07-08
YZR7578 Yangtze River Express 3 2026-05-18
YZR7536 Yangtze River Express 3 2026-06-02
YZR7531 - 3 2026-06-22
YZR7527 - 3 2026-06-22
YZR7502 - 3 2026-06-25
YZR7501 - 3 2026-06-25
YZR7595 Yangtze River Express 2 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 YZR7538 - Jul 17, 18:05 UTCJul 17, 18:15 UTC10m
2026-07-17 YZR7579 - Jul 17, 06:25 UTCJul 17, 11:10 UTC4h 45m
2026-07-16 YZR7537 - Jul 16, 22:55 UTCJul 16, 23:05 UTC10m
2026-07-16 YZR7538 - Jul 16, 17:25 UTCJul 16, 17:35 UTC10m
2026-07-16 YZR7579 - Jul 16, 07:10 UTCJul 16, 10:29 UTC3h 20m
2026-07-15 YZR7537 - Jul 15, 23:05 UTCJul 15, 23:20 UTC15m
2026-07-15 YZR7574 - Jul 15, 13:35 UTCJul 15, 13:45 UTC10m
2026-07-15 YZR7573 - Jul 15, 09:35 UTCJul 15, 09:45 UTC10m
2026-07-15 YZR7566 - Jul 15, 07:55 UTCJul 15, 08:05 UTC10m
2026-07-15 YZR7566 - Jul 15, 06:15 UTCJul 15, 06:40 UTC25m
2026-07-08 YZR7596 - Jul 8, 15:40 UTCJul 8, 16:40 UTC1h 0m
2026-07-08 YZR7544 - Jul 8, 04:25 UTCJul 8, 04:35 UTC10m
2026-07-03 YZR7596 - Jul 3, 13:00 UTCJul 3, 13:10 UTC10m
2026-07-01 YZR7596 - Jul 1, 12:05 UTCJul 1, 12:15 UTC10m
2026-07-01 YZR7544 - Jul 1, 04:15 UTCJul 1, 04:25 UTC10m
2026-06-27 YZR7565 - Jun 27, 23:00 UTCJun 27, 23:10 UTC10m
2026-06-27 YZR7535 - Jun 27, 08:44 UTCJun 27, 09:00 UTC15m
2026-06-27 YZR7566 - Jun 27, 07:10 UTCJun 27, 07:19 UTC10m
2026-06-25 YZR7502 - Jun 25, 13:20 UTCJun 26, 04:39 UTC15h 20m
2026-06-25 YZR7501 - Jun 25, 04:25 UTCJun 25, 10:04 UTC5h 40m
2026-06-22 YZR7527 - Jun 22, 23:50 UTCJun 23, 00:00 UTC10m
2026-06-22 YZR7532 - Jun 22, 10:15 UTCJun 22, 11:04 UTC50m
2026-06-22 YZR7531 - Jun 22, 01:44 UTCJun 22, 01:55 UTC10m
2026-06-21 YZR7532 - Jun 21, 14:34 UTCJun 21, 14:59 UTC25m
2026-06-21 YZR7531 - Jun 21, 01:35 UTCJun 21, 01:49 UTC15m
2026-06-20 YZR7532 - Jun 20, 14:35 UTCJun 20, 14:54 UTC20m
2026-06-20 YZR7532 - Jun 20, 09:29 UTCJun 20, 10:15 UTC45m
2026-06-20 YZR7531 - Jun 20, 00:59 UTCJun 20, 01:09 UTC10m
2026-06-19 YZR7527 - Jun 19, 07:09 UTCJun 19, 07:25 UTC15m
2026-06-18 YZR7538 KWE → SZX Jun 18, 22:25 UTCJun 18, 22:50 UTC25m
2026-06-18 YZR7579 - Jun 18, 07:30 UTCJun 18, 10:35 UTC3h 5m
2026-06-17 YZR7574 DYG → SZX Jun 17, 15:05 UTCJun 17, 15:20 UTC15m
2026-06-17 YZR7573 - Jun 17, 10:25 UTCJun 17, 10:35 UTC10m
2026-06-17 YZR7566 - Jun 17, 08:45 UTCJun 17, 08:55 UTC10m
2026-06-13 YZR7526 - Jun 13, 17:40 UTCJun 13, 17:55 UTC15m
2026-06-12 YZR7525 SZX → TNA Jun 12, 22:20 UTCJun 12, 22:30 UTC10m
2026-06-11 YZR7525 SZX → TNA Jun 11, 22:20 UTCJun 11, 22:30 UTC10m
2026-06-11 YZR7566 PVG → SZX Jun 11, 07:00 UTCJun 11, 07:25 UTC25m
2026-06-08 YZR7579 PVG → ZUH Jun 8, 08:00 UTCJun 8, 08:15 UTC15m
2026-06-08 YZR7579 PVG → ZUH Jun 8, 07:00 UTCJun 8, 07:25 UTC25m
2026-06-07 YZR7537 SZX → KWE Jun 7, 23:00 UTCJun 7, 23:10 UTC10m
2026-06-07 YZR7563 SZX → LNL Jun 7, 03:50 UTCJun 7, 04:00 UTC10m
2026-06-06 YZR7591 SZX → ACX Jun 6, 22:30 UTCJun 6, 22:44 UTC15m
2026-06-06 YZR7580 ZUH → PVG Jun 6, 08:55 UTCJun 6, 09:15 UTC20m
2026-06-06 YZR7579 PVG → ZUH Jun 6, 05:30 UTCJun 6, 06:15 UTC45m
2026-06-05 YZR7537 SZX → KWE Jun 5, 23:00 UTCJun 5, 23:15 UTC15m
2026-06-05 YZR7579 PVG → ZUH Jun 5, 07:50 UTCJun 5, 10:55 UTC3h 5m
2026-06-04 YZR7537 SZX → KWE Jun 4, 23:05 UTCJun 4, 23:15 UTC10m
2026-06-04 YZR7538 KWE → SZX Jun 4, 18:10 UTCJun 4, 18:20 UTC10m
2026-06-04 YZR7580 ZUH → PVG Jun 4, 10:40 UTCJun 4, 10:50 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-5403 page for operator, model, and routing details .

Mode-S 7804A1 frequently asked

What is Mode-S code 7804A1?
7804A1 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-5403.
Where is Mode-S 7804A1 registered?
Mode-S code 7804A1 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7804A1 broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7804A1, octal 36002241, decimal 7,865,505.
What flights does 7804A1 operate?
Mode-S 7804A1 has broadcast 20 distinct callsigns, including YZR7579, YZR7537, YZR7566, YZR7526, YZR7525.