Apparatus

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sensors Mode-S transponder

781F23

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-223L · BOEING 767-300

Hex
781F23
Octal
36017443
Decimal
7,872,291
Country
CN
Tail
B-223L
Type
B763
No current signal · last broadcast 1d ago
Flights observed
146
Distinct callsigns
20
Country
CN
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 781F23.

Country allocation

The ICAO 24-bit address 781F23 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
CSS127 - 12 2026-07-01
CSS161 - 9 2026-07-02
CSS128 - 9 2026-07-01
CSS358 - 6 2026-06-23
CSS357 - 6 2026-06-23
CSS240 - 6 2026-06-30
CSS239 SF Airlines 6 2026-06-21
CSS206 - 6 2026-06-27
CSS159 - 6 2026-06-19
CSS168 - 5 2026-06-22
CSS155 - 5 2026-07-03
CSS6804 - 4 2026-06-22
CSS363 SF Airlines 4 2026-06-07
CSS257 - 4 2026-07-12
CSS7223 SF Airlines 3 2026-06-10
CSS6835 SF Airlines 3 2026-06-10
CSS6801 SF Airlines 3 2026-06-23
CSS364 SF Airlines 3 2026-06-08
CSS205 - 3 2026-04-16
CSS167 - 3 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 CSS256 - Jul 12, 12:35 UTCJul 12, 13:40 UTC1h 5m
2026-07-12 CSS257 DAC → DAC Jul 12, 02:40 UTCJul 12, 10:55 UTC8h 15m
2026-07-11 CSS257 - Jul 11, 10:20 UTCJul 11, 18:15 UTC7h 55m
2026-07-11 CSS255 - Jul 11, 04:40 UTCJul 11, 08:01 UTC3h 20m
2026-07-10 CSS6864 - Jul 10, 21:25 UTCJul 10, 21:35 UTC10m
2026-07-09 CSS250 - Jul 9, 02:15 UTCJul 9, 10:45 UTC8h 30m
2026-07-07 CSS7103 - Jul 7, 17:05 UTCJul 7, 17:20 UTC15m
2026-07-05 CSS6839 - Jul 5, 00:50 UTCJul 5, 01:00 UTC10m
2026-07-04 CSS6802 - Jul 4, 21:00 UTCJul 4, 21:30 UTC30m
2026-07-04 CSS156 - Jul 4, 11:55 UTCJul 4, 15:15 UTC3h 20m
2026-07-03 CSS155 - Jul 3, 16:50 UTCJul 4, 10:20 UTC17h 30m
2026-07-03 CSS155 - Jul 3, 12:50 UTCJul 4, 10:20 UTC21h 30m
2026-07-03 CSS155 - Jul 3, 10:50 UTCJul 4, 10:20 UTC23h 30m
2026-07-02 CSS162 - Jul 2, 23:55 UTCJul 3, 18:35 UTC18h 40m
2026-07-02 CSS161 - Jul 2, 19:20 UTCJul 2, 22:05 UTC2h 45m
2026-07-01 CSS161 - Jul 1, 22:50 UTCJul 2, 22:05 UTC23h 15m
2026-07-01 CSS161 - Jul 1, 22:10 UTCJul 2, 20:45 UTC22h 35m
2026-07-01 CSS128 - Jul 1, 16:55 UTCJul 1, 22:55 UTC6h 0m
2026-07-01 CSS127 - Jul 1, 05:40 UTCJul 1, 14:55 UTC9h 15m
2026-06-30 CSS127 - Jun 30, 16:50 UTCJul 1, 14:55 UTC22h 5m
2026-06-30 CSS160 - Jun 30, 15:00 UTCJul 1, 14:45 UTC23h 45m
2026-06-30 CSS240 - Jun 30, 00:25 UTCJun 30, 12:50 UTC12h 26m
2026-06-29 CSS161 - Jun 29, 19:39 UTCJun 29, 22:30 UTC2h 50m
2026-06-28 CSS128 - Jun 28, 14:25 UTCJun 28, 20:19 UTC5h 55m
2026-06-27 CSS206 BUD → BUD Jun 27, 16:59 UTCJun 28, 11:19 UTC18h 20m
2026-06-27 CSS127 - Jun 27, 06:15 UTCJun 27, 13:49 UTC7h 35m
2026-06-26 CSS127 - Jun 26, 16:49 UTCJun 27, 13:49 UTC21h 0m
2026-06-26 CSS127 - Jun 26, 16:44 UTCJun 27, 13:49 UTC21h 5m
2026-06-23 CSS6801 SZX → EHU Jun 23, 17:50 UTCJun 23, 18:04 UTC15m
2026-06-23 CSS358 - Jun 23, 03:45 UTCJun 23, 04:05 UTC20m
2026-06-23 CSS358 - Jun 23, 02:49 UTCJun 23, 03:09 UTC20m
2026-06-23 CSS357 - Jun 23, 00:04 UTCJun 23, 00:50 UTC45m
2026-06-22 CSS357 - Jun 22, 23:20 UTCJun 22, 23:29 UTC10m
2026-06-22 CSS6804 - Jun 22, 20:55 UTCJun 22, 21:14 UTC20m
2026-06-22 CSS168 - Jun 22, 07:40 UTCJun 22, 08:04 UTC25m
2026-06-22 CSS168 - Jun 22, 02:25 UTCJun 22, 04:34 UTC2h 10m
2026-06-21 CSS167 - Jun 21, 10:44 UTCJun 22, 00:40 UTC13h 55m
2026-06-21 CSS239 ZUH → DEL Jun 21, 04:30 UTCJun 21, 08:44 UTC4h 15m
2026-06-20 CSS240 - Jun 20, 20:45 UTCJun 21, 00:34 UTC3h 50m
2026-06-19 CSS159 - Jun 19, 23:25 UTCJun 20, 18:45 UTC19h 20m
2026-06-19 CSS128 BUD → IXA Jun 19, 17:55 UTCJun 20, 16:44 UTC22h 50m
2026-06-19 CSS127 - Jun 19, 07:04 UTCJun 19, 15:09 UTC8h 5m
2026-06-16 CSS358 - Jun 16, 04:39 UTCJun 16, 04:50 UTC10m
2026-06-16 CSS358 - Jun 16, 03:30 UTCJun 16, 03:50 UTC20m
2026-06-16 CSS357 - Jun 16, 00:24 UTCJun 16, 00:55 UTC30m
2026-06-15 CSS357 - Jun 15, 23:35 UTCJun 15, 23:45 UTC10m
2026-06-15 CSS6804 - Jun 15, 21:04 UTCJun 15, 21:25 UTC20m
2026-06-14 CSS128 - Jun 14, 14:40 UTCJun 14, 21:00 UTC6h 20m
2026-06-13 CSS206 BUD → BUD Jun 13, 17:00 UTCJun 14, 12:05 UTC19h 5m
2026-06-13 CSS127 - Jun 13, 05:55 UTCJun 13, 13:45 UTC7h 50m

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-223L page for operator, model, and routing details .

Mode-S 781F23 frequently asked

What is Mode-S code 781F23?
781F23 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-223L.
Where is Mode-S 781F23 registered?
Mode-S code 781F23 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781F23 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781F23, octal 36017443, decimal 7,872,291.
What flights does 781F23 operate?
Mode-S 781F23 has broadcast 20 distinct callsigns, including CSS127, CSS161, CSS128, CSS358, CSS357.