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sensors Mode-S transponder

781C1F

ICAO 24-bit transponder address · allocated to China

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

Hex
781C1F
Octal
36016037
Decimal
7,871,519
Country
CN
Tail
B-220Z
Type
B752
No current signal · last broadcast 6h ago
Flights observed
123
Distinct callsigns
20
Country
CN
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 781C1F.

Country allocation

The ICAO 24-bit address 781C1F 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
YZR7912 Yangtze River Express 15 2026-04-24
YZR7911 Yangtze River Express 13 2026-04-24
CSS326 - 10 2026-07-08
CSS7410 SF Airlines 6 2026-05-26
CSS314 - 6 2026-06-03
CSS7277 - 5 2026-06-18
CSS325 - 5 2026-07-08
CSS313 SF Airlines 4 2026-06-03
CSS7409 - 3 2026-05-27
CSS7224 - 3 2026-07-10
CSS6839 SF Airlines 3 2026-05-12
CSS6836 - 3 2026-07-11
CSS7125 SF Airlines 2 2026-06-20
CSS6846 - 2 2026-06-29
CSS6845 - 2 2026-06-29
CSS6840 SF Airlines 2 2026-05-08
CSS6828 SF Airlines 2 2026-07-09
CSS6827 - 2 2026-07-09
CSS6816 - 2 2026-06-18
CSS6813 - 2 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CSS302 - Jul 13, 23:05 UTCJul 13, 23:20 UTC15m
2026-07-13 CSS302 - Jul 13, 19:45 UTCJul 13, 20:10 UTC25m
2026-07-13 CSS301 - Jul 13, 17:10 UTCJul 13, 17:40 UTC30m
2026-07-13 CSS301 - Jul 13, 14:25 UTCJul 13, 14:35 UTC10m
2026-07-11 CSS7307 - Jul 11, 22:30 UTCJul 11, 22:50 UTC20m
2026-07-11 CSS7308 - Jul 11, 17:00 UTCJul 11, 17:15 UTC15m
2026-07-11 CSS6836 - Jul 11, 00:10 UTCJul 11, 01:00 UTC50m
2026-07-10 CSS7224 - Jul 10, 19:50 UTCJul 10, 20:00 UTC10m
2026-07-09 CSS6828 PVG → SZX Jul 9, 23:15 UTCJul 10, 00:10 UTC55m
2026-07-09 CSS6827 - Jul 9, 18:25 UTCJul 9, 18:35 UTC10m
2026-07-08 CSS326 - Jul 8, 21:40 UTCJul 8, 21:55 UTC15m
2026-07-08 CSS326 - Jul 8, 20:00 UTCJul 8, 20:30 UTC30m
2026-07-08 CSS325 - Jul 8, 16:20 UTCJul 8, 18:20 UTC2h 0m
2026-07-06 CSS6804 - Jul 6, 21:55 UTCJul 6, 22:15 UTC20m
2026-07-06 CSS6805 - Jul 6, 17:00 UTCJul 6, 17:10 UTC10m
2026-07-05 CSS6802 - Jul 5, 21:50 UTCJul 5, 22:10 UTC20m
2026-06-30 CSS6803 - Jun 30, 17:15 UTCJun 30, 17:25 UTC10m
2026-06-29 CSS6846 - Jun 29, 23:29 UTCJun 29, 23:49 UTC20m
2026-06-29 CSS6845 - Jun 29, 18:49 UTCJun 29, 19:05 UTC15m
2026-06-28 CSS6836 - Jun 28, 21:50 UTCJun 28, 22:29 UTC40m
2026-06-28 CSS7224 - Jun 28, 17:55 UTCJun 28, 18:10 UTC15m
2026-06-27 CSS326 - Jun 27, 22:35 UTCJun 27, 23:04 UTC30m
2026-06-27 CSS326 - Jun 27, 20:39 UTCJun 27, 21:10 UTC30m
2026-06-27 CSS325 - Jun 27, 17:29 UTCJun 27, 19:24 UTC1h 55m
2026-06-26 CSS6836 - Jun 26, 22:29 UTCJun 26, 22:49 UTC20m
2026-06-26 CSS7224 - Jun 26, 17:54 UTCJun 26, 18:04 UTC10m
2026-06-22 CSS6828 PVG → SZX Jun 22, 21:49 UTCJun 22, 22:59 UTC1h 10m
2026-06-22 CSS6827 - Jun 22, 17:20 UTCJun 22, 17:29 UTC10m
2026-06-22 CSS6812 - Jun 22, 00:14 UTCJun 22, 00:40 UTC25m
2026-06-21 CSS6812 - Jun 21, 21:49 UTCJun 21, 22:10 UTC20m
2026-06-20 CSS7125 PEK → WUX Jun 20, 16:05 UTCJun 20, 16:14 UTC10m
2026-06-18 CSS7277 - Jun 18, 20:20 UTCJun 18, 20:35 UTC15m
2026-06-18 CSS7277 - Jun 18, 19:10 UTCJun 18, 19:40 UTC30m
2026-06-18 CSS7274 - Jun 18, 16:40 UTCJun 18, 16:50 UTC10m
2026-06-18 CSS6816 - Jun 18, 06:40 UTCJun 18, 06:55 UTC15m
2026-06-18 CSS6816 - Jun 18, 01:55 UTCJun 18, 02:35 UTC40m
2026-06-16 CSS6813 - Jun 16, 18:55 UTCJun 16, 19:05 UTC10m
2026-06-15 CSS6810 - Jun 15, 20:54 UTCJun 15, 21:14 UTC20m
2026-06-11 CSS142 ICN → EHU Jun 11, 14:55 UTCJun 11, 15:15 UTC20m
2026-06-11 CSS279 YNT → ICN Jun 11, 05:50 UTCJun 11, 06:15 UTC25m
2026-06-11 CSS280 ICN → YNT Jun 11, 02:55 UTCJun 11, 03:10 UTC15m
2026-06-10 CSS141 EHU → ICN Jun 10, 23:00 UTCJun 10, 23:20 UTC20m
2026-06-05 CSS6805 SZX → EHU Jun 5, 17:00 UTCJun 5, 17:15 UTC15m
2026-06-04 CSS326 MNL → SZX Jun 4, 23:25 UTCJun 4, 23:45 UTC20m
2026-06-04 CSS326 MNL → SZX Jun 4, 21:45 UTCJun 4, 22:20 UTC35m
2026-06-04 CSS325 SZX → MNL Jun 4, 17:55 UTCJun 4, 20:00 UTC2h 5m
2026-06-03 CSS6846 NTG → SZX Jun 3, 23:25 UTCJun 3, 23:50 UTC25m
2026-06-03 CSS6845 SZX → NTG Jun 3, 18:45 UTCJun 3, 18:55 UTC10m
2026-06-03 CSS314 - Jun 3, 13:30 UTCJun 3, 13:45 UTC15m
2026-06-03 CSS314 - Jun 3, 11:25 UTCJun 3, 12:55 UTC1h 30m

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-220Z page for operator, model, and routing details .

Mode-S 781C1F frequently asked

What is Mode-S code 781C1F?
781C1F is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-220Z.
Where is Mode-S 781C1F registered?
Mode-S code 781C1F is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781C1F broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781C1F, octal 36016037, decimal 7,871,519.
What flights does 781C1F operate?
Mode-S 781C1F has broadcast 20 distinct callsigns, including YZR7912, YZR7911, CSS326, CSS7410, CSS314.