Apparatus

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sensors Mode-S transponder

7819D4

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-220A · BOEING 757-200

Hex
7819D4
Octal
36014724
Decimal
7,870,932
Country
CN
Tail
B-220A
Type
B752
No current signal · last broadcast 2d ago
Flights observed
37
Distinct callsigns
20
Country
CN
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 7819D4.

Country allocation

The ICAO 24-bit address 7819D4 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
CSS7240 SF Airlines 6 2026-04-30
CSS7204 SF Airlines 4 2026-05-07
CSS7203 SF Airlines 3 2026-05-06
CSS6836 SF Airlines 2 2026-05-04
CSS6812 SF Airlines 2 2026-05-08
CSS6805 SF Airlines 2 2026-06-04
CSS6802 SF Airlines 2 2026-06-03
CSS326 SF Airlines 2 2026-05-09
CSS325 SF Airlines 2 2026-05-09
CSS7224 SF Airlines 1 2026-05-04
CSS7205 - 1 2026-05-07
CSS7202 SF Airlines 1 2026-04-21
CSS6811 SF Airlines 1 2026-04-21
CSS318 - 1 2026-05-09
CSS317 SF Airlines 1 2026-05-09
CSS314 - 1 2026-05-04
CSS313 SF Airlines 1 2026-05-04
CSS280 SF Airlines 1 2026-05-26
CSS279 SF Airlines 1 2026-05-26
CSS142 SF Airlines 1 2026-05-26

Recent flights last 37

DateFlightRouteTakeoffLandingDuration
2026-06-04 CSS6805 SZX → EHU Jun 4, 16:55 UTCJun 4, 17:05 UTC10m
2026-06-03 CSS6802 EHU → SZX Jun 3, 22:00 UTCJun 3, 22:10 UTC10m
2026-05-26 CSS142 ICN → EHU May 26, 15:00 UTCMay 26, 15:20 UTC20m
2026-05-26 CSS279 YNT → ICN May 26, 08:54 UTCMay 26, 09:15 UTC20m
2026-05-26 CSS280 ICN → YNT May 26, 03:09 UTCMay 26, 03:25 UTC15m
2026-05-25 CSS141 EHU → ICN May 25, 23:14 UTCMay 25, 23:40 UTC25m
2026-05-10 CSS6805 SZX → EHU May 10, 16:50 UTCMay 10, 17:05 UTC15m
2026-05-09 CSS326 MNL → SZX May 9, 21:40 UTCMay 9, 21:55 UTC15m
2026-05-09 CSS326 MNL → SZX May 9, 19:55 UTCMay 9, 20:30 UTC35m
2026-05-09 CSS325 SZX → MNL May 9, 17:55 UTCMay 9, 18:30 UTC35m
2026-05-09 CSS325 SZX → MNL May 9, 16:40 UTCMay 9, 17:10 UTC30m
2026-05-09 CSS318 - May 9, 09:05 UTCMay 9, 09:20 UTC15m
2026-05-09 CSS317 SZX → SGN May 9, 03:05 UTCMay 9, 03:15 UTC10m
2026-05-08 CSS6812 PEK → SZX May 8, 22:55 UTCMay 8, 23:10 UTC15m
2026-05-08 CSS6812 PEK → SZX May 8, 20:30 UTCMay 8, 20:40 UTC10m
2026-05-07 CSS7204 SZX → PVG May 7, 20:10 UTCMay 7, 20:20 UTC10m
2026-05-07 CSS7205 - May 7, 18:10 UTCMay 7, 18:20 UTC10m
2026-05-06 CSS7204 SZX → PVG May 6, 19:45 UTCMay 6, 20:00 UTC15m
2026-05-06 CSS7203 PVG → SZX May 6, 17:55 UTCMay 6, 18:20 UTC25m
2026-05-05 CSS7204 SZX → PVG May 5, 21:45 UTCMay 5, 21:55 UTC10m
2026-05-04 CSS6836 HGH → SZX May 4, 22:00 UTCMay 4, 22:45 UTC45m
2026-05-04 CSS7224 SZX → HGH May 4, 17:50 UTCMay 4, 18:00 UTC10m
2026-05-04 CSS314 - May 4, 10:50 UTCMay 4, 11:20 UTC30m
2026-05-04 CSS313 SZX → BKK May 4, 05:10 UTCMay 4, 07:30 UTC2h 20m
2026-05-03 CSS6836 HGH → SZX May 3, 22:05 UTCMay 3, 22:30 UTC25m
2026-04-30 CSS7240 PEK → HGH Apr 30, 21:10 UTCApr 30, 21:20 UTC10m
2026-04-29 CSS7240 PEK → HGH Apr 29, 21:05 UTCApr 29, 21:15 UTC10m
2026-04-28 CSS7240 PEK → HGH Apr 28, 20:50 UTCApr 28, 21:00 UTC10m
2026-04-27 CSS7240 PEK → HGH Apr 27, 20:50 UTCApr 27, 21:00 UTC10m
2026-04-25 CSS7240 PEK → HGH Apr 25, 20:55 UTCApr 25, 21:05 UTC10m
2026-04-24 CSS7240 PEK → HGH Apr 24, 20:40 UTCApr 24, 20:50 UTC10m
2026-04-22 CSS7204 SZX → PVG Apr 22, 20:30 UTCApr 22, 20:40 UTC10m
2026-04-22 CSS7203 PVG → SZX Apr 22, 18:30 UTCApr 22, 18:40 UTC10m
2026-04-21 CSS7202 PEK → PVG Apr 21, 21:45 UTCApr 21, 21:55 UTC10m
2026-04-21 CSS6811 SZX → PEK Apr 21, 16:50 UTCApr 21, 17:01 UTC10m
2026-04-20 CSS6802 EHU → SZX Apr 20, 21:45 UTCApr 20, 22:05 UTC20m
2026-04-18 CSS7203 PVG → SZX Apr 18, 20:05 UTCApr 18, 20:25 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-220A page for operator, model, and routing details .

Mode-S 7819D4 frequently asked

What is Mode-S code 7819D4?
7819D4 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-220A.
Where is Mode-S 7819D4 registered?
Mode-S code 7819D4 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7819D4 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 7819D4, octal 36014724, decimal 7,870,932.
What flights does 7819D4 operate?
Mode-S 7819D4 has broadcast 20 distinct callsigns, including CSS7240, CSS7204, CSS7203, CSS6836, CSS6812.