Apparatus

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sensors Mode-S transponder

781A7A

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-220H · BOEING 767-300

Hex
781A7A
Octal
36015172
Decimal
7,871,098
Country
CN
Tail
B-220H
Type
B763
No current signal · last broadcast 4h ago
Flights observed
132
Distinct callsigns
20
Country
CN
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 781A7A.

Country allocation

The ICAO 24-bit address 781A7A 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
CSS241 - 8 2026-06-20
CSS237 - 8 2026-07-11
CSS242 - 7 2026-06-21
CSS231 SF Airlines 6 2026-06-04
CSS7223 SF Airlines 5 2026-05-09
CSS6835 SF Airlines 5 2026-05-09
CSS6801 SF Airlines 5 2026-07-02
CSS364 - 5 2026-07-04
CSS363 SF Airlines 5 2026-07-03
CSS173 - 5 2026-06-07
CSS335 - 4 2026-07-03
CSS168 - 4 2026-07-08
CSS6802 - 3 2026-07-02
CSS238 SF Airlines 3 2026-05-26
CSS232 - 3 2026-06-04
CSS161 - 3 2026-07-13
CSS155 SF Airlines 3 2026-06-12
CSS6804 SF Airlines 2 2026-06-01
CSS6803 - 2 2026-07-04
CSS358 SF Airlines 2 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CSS240 - Jul 14, 00:00 UTCJul 14, 02:55 UTC2h 55m
2026-07-13 CSS161 - Jul 13, 19:15 UTCJul 13, 22:00 UTC2h 45m
2026-07-11 CSS237 - Jul 11, 01:30 UTCJul 11, 09:20 UTC7h 50m
2026-07-10 CSS237 - Jul 10, 08:35 UTCJul 11, 08:30 UTC23h 55m
2026-07-10 CSS254 - Jul 10, 06:55 UTCJul 11, 03:30 UTC20h 35m
2026-07-10 CSS253 - Jul 10, 02:10 UTCJul 10, 05:05 UTC2h 55m
2026-07-08 CSS168 - Jul 8, 14:50 UTCJul 8, 15:10 UTC20m
2026-07-08 CSS168 - Jul 8, 08:45 UTCJul 8, 12:10 UTC3h 25m
2026-07-08 CSS167 - Jul 8, 00:40 UTCJul 8, 03:20 UTC2h 40m
2026-07-05 CSS6839 - Jul 5, 22:30 UTCJul 5, 22:40 UTC10m
2026-07-05 CSS332 - Jul 5, 13:55 UTCJul 5, 14:05 UTC10m
2026-07-05 CSS332 - Jul 5, 09:15 UTCJul 5, 12:00 UTC2h 45m
2026-07-05 CSS165 - Jul 5, 04:25 UTCJul 5, 07:10 UTC2h 45m
2026-07-04 CSS6803 - Jul 4, 17:25 UTCJul 4, 17:35 UTC10m
2026-07-04 CSS364 - Jul 4, 05:45 UTCJul 4, 05:55 UTC10m
2026-07-04 CSS364 - Jul 4, 01:30 UTCJul 4, 03:15 UTC1h 45m
2026-07-03 CSS363 SZX → NRT Jul 3, 21:45 UTCJul 3, 23:25 UTC1h 40m
2026-07-03 CSS363 SZX → NRT Jul 3, 19:40 UTCJul 3, 19:50 UTC10m
2026-07-03 CSS335 - Jul 3, 06:25 UTCJul 3, 15:25 UTC9h 0m
2026-07-03 CSS335 - Jul 3, 05:40 UTCJul 3, 05:50 UTC10m
2026-07-02 CSS6802 - Jul 2, 21:50 UTCJul 2, 22:05 UTC15m
2026-07-02 CSS6801 SZX → EHU Jul 2, 17:40 UTCJul 2, 17:50 UTC10m
2026-07-01 CSS6802 - Jul 1, 21:50 UTCJul 1, 22:05 UTC15m
2026-06-29 CSS6801 SZX → EHU Jun 29, 17:34 UTCJun 29, 17:45 UTC10m
2026-06-27 CSS250 - Jun 27, 03:15 UTCJun 27, 10:19 UTC7h 5m
2026-06-22 CSS7103 - Jun 22, 17:20 UTCJun 22, 17:34 UTC15m
2026-06-21 CSS242 - Jun 21, 07:40 UTCJun 21, 09:55 UTC2h 15m
2026-06-20 CSS241 - Jun 20, 15:39 UTCJun 21, 05:54 UTC14h 15m
2026-06-19 CSS7635 - Jun 19, 21:39 UTCJun 20, 16:00 UTC18h 20m
2026-06-19 CSS242 - Jun 19, 07:54 UTCJun 19, 21:44 UTC13h 50m
2026-06-19 CSS241 - Jun 19, 03:34 UTCJun 19, 05:59 UTC2h 25m
2026-06-17 CSS6936 - Jun 17, 17:25 UTCJun 17, 17:35 UTC10m
2026-06-15 CSS148 - Jun 15, 15:50 UTCJun 15, 18:15 UTC2h 25m
2026-06-15 CSS239 ZUH → DEL Jun 15, 12:35 UTCJun 15, 13:15 UTC40m
2026-06-15 CSS239 ZUH → DEL Jun 15, 04:34 UTCJun 15, 10:09 UTC5h 35m
2026-06-14 CSS240 - Jun 14, 20:20 UTCJun 14, 22:50 UTC2h 30m
2026-06-14 CSS159 - Jun 14, 16:15 UTCJun 14, 18:15 UTC2h 0m
2026-06-13 CSS156 LHE → EHU Jun 13, 12:45 UTCJun 13, 15:30 UTC2h 45m
2026-06-12 CSS155 EHU → LHE Jun 12, 16:30 UTCJun 13, 10:15 UTC17h 44m
2026-06-12 CSS155 EHU → LHE Jun 12, 12:35 UTCJun 13, 10:15 UTC21h 39m
2026-06-12 CSS155 EHU → LHE Jun 12, 11:10 UTCJun 13, 10:15 UTC23h 4m
2026-06-12 CSS162 DEL → EHU Jun 12, 00:45 UTCJun 12, 18:05 UTC17h 20m
2026-06-11 CSS161 EHU → DEL Jun 11, 05:40 UTCJun 11, 22:45 UTC17h 5m
2026-06-10 CSS163 EHU → DEL Jun 10, 11:05 UTCJun 11, 03:40 UTC16h 35m
2026-06-10 CSS148 - Jun 10, 00:25 UTCJun 10, 18:00 UTC17h 35m
2026-06-09 CSS161 EHU → DEL Jun 9, 20:00 UTCJun 9, 22:15 UTC2h 15m
2026-06-08 CSS160 DEL → EHU Jun 8, 14:55 UTCJun 8, 17:10 UTC2h 15m
2026-06-07 CSS159 EHU → DEL Jun 7, 20:45 UTCJun 8, 12:45 UTC16h 0m
2026-06-07 CSS173 - Jun 7, 18:30 UTCJun 7, 18:40 UTC10m
2026-06-07 CSS173 - Jun 7, 16:10 UTCJun 7, 17:45 UTC1h 35m

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

Mode-S 781A7A frequently asked

What is Mode-S code 781A7A?
781A7A is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-220H.
Where is Mode-S 781A7A registered?
Mode-S code 781A7A is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781A7A 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 781A7A, octal 36015172, decimal 7,871,098.
What flights does 781A7A operate?
Mode-S 781A7A has broadcast 20 distinct callsigns, including CSS241, CSS237, CSS242, CSS231, CSS7223.