Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 8h ago
Flights observed
69
Distinct callsigns
20
Country
CN
Last broadcast
8h 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
CSS239 SF Airlines 5 2026-05-24
CSS161 SF Airlines 5 2026-04-27
CSS159 SF Airlines 5 2026-05-22
CSS240 - 4 2026-05-23
CSS128 - 4 2026-05-26
CSS205 - 3 2026-04-16
CSS168 SF Airlines 3 2026-05-27
CSS127 - 3 2026-05-24
CSS7223 SF Airlines 2 2026-05-29
CSS6835 SF Airlines 2 2026-05-29
CSS6801 SF Airlines 2 2026-05-20
CSS358 SF Airlines 2 2026-05-20
CSS357 SF Airlines 2 2026-05-20
CSS258 - 2 2026-05-02
CSS257 - 2 2026-05-02
CSS206 - 2 2026-04-15
CSS167 - 2 2026-05-26
CSS162 SF Airlines 2 2026-04-26
CSS160 SF Airlines 2 2026-04-17
CSS155 SF Airlines 2 2026-05-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 CSS6835 SZX → HGH May 29, 21:00 UTCMay 29, 21:15 UTC15m
2026-05-29 CSS7223 HGH → SZX May 29, 18:30 UTCMay 29, 19:15 UTC45m
2026-05-28 CSS6835 SZX → HGH May 28, 20:50 UTCMay 28, 21:05 UTC15m
2026-05-28 CSS7223 HGH → SZX May 28, 18:45 UTCMay 28, 19:05 UTC20m
2026-05-27 CSS168 HAN → EHU May 27, 11:55 UTCMay 27, 12:15 UTC20m
2026-05-27 CSS168 HAN → EHU May 27, 06:29 UTCMay 27, 09:30 UTC3h 0m
2026-05-26 CSS167 - May 26, 09:45 UTCMay 27, 03:50 UTC18h 5m
2026-05-26 CSS128 - May 26, 04:24 UTCMay 26, 10:34 UTC6h 10m
2026-05-24 CSS127 - May 24, 12:50 UTCMay 25, 07:30 UTC18h 40m
2026-05-24 CSS158 DEL → EHU May 24, 11:10 UTCMay 25, 07:30 UTC20h 20m
2026-05-24 CSS239 ZUH → DEL May 24, 06:10 UTCMay 24, 09:00 UTC2h 50m
2026-05-23 CSS240 - May 23, 21:10 UTCMay 23, 23:35 UTC2h 25m
2026-05-22 CSS159 EHU → DEL May 22, 23:40 UTCMay 23, 18:20 UTC18h 40m
2026-05-22 CSS159 EHU → DEL May 22, 18:50 UTCMay 23, 18:20 UTC23h 30m
2026-05-22 CSS122 OSL → DAC May 22, 17:25 UTCMay 23, 16:45 UTC23h 20m
2026-05-22 CSS121 KGF → KGF May 22, 07:45 UTCMay 22, 15:15 UTC7h 29m
2026-05-20 CSS6801 SZX → EHU May 20, 18:30 UTCMay 20, 18:40 UTC10m
2026-05-20 CSS358 TPE → SZX May 20, 05:10 UTCMay 20, 05:20 UTC10m
2026-05-20 CSS358 TPE → SZX May 20, 04:00 UTCMay 20, 04:25 UTC25m
2026-05-20 CSS357 SZX → TPE May 20, 01:30 UTCMay 20, 02:10 UTC40m
2026-05-20 CSS357 SZX → TPE May 20, 00:45 UTCMay 20, 00:55 UTC10m
2026-05-19 CSS6804 EHU → SZX May 19, 21:00 UTCMay 19, 21:05 UTC5m
2026-05-12 CSS156 LHE → EHU May 12, 12:55 UTCMay 12, 15:25 UTC2h 30m
2026-05-12 CSS155 EHU → LHE May 12, 08:10 UTCMay 12, 11:15 UTC3h 5m
2026-05-11 CSS155 EHU → LHE May 11, 12:50 UTCMay 12, 11:15 UTC22h 26m
2026-05-11 CSS148 - May 11, 11:35 UTCMay 12, 10:45 UTC23h 11m
2026-05-11 CSS239 ZUH → DEL May 11, 06:45 UTCMay 11, 09:30 UTC2h 45m
2026-05-10 CSS240 - May 10, 20:35 UTCMay 10, 22:30 UTC1h 55m
2026-05-10 CSS159 EHU → DEL May 10, 15:55 UTCMay 10, 18:55 UTC3h 0m
2026-05-06 CSS7635 SHE → EHU May 6, 21:55 UTCMay 7, 16:10 UTC18h 15m
2026-05-02 CSS258 - May 2, 06:45 UTCMay 2, 07:25 UTC40m
2026-05-02 CSS257 - May 2, 04:20 UTCMay 2, 05:25 UTC1h 5m
2026-04-29 CSS168 HAN → EHU Apr 29, 06:25 UTCApr 29, 09:30 UTC3h 6m
2026-04-28 CSS167 - Apr 28, 15:00 UTCApr 29, 03:45 UTC12h 45m
2026-04-28 CSS239 ZUH → DEL Apr 28, 10:45 UTCApr 28, 13:05 UTC2h 20m
2026-04-28 CSS240 - Apr 28, 00:40 UTCApr 28, 02:45 UTC2h 5m
2026-04-27 CSS161 EHU → DEL Apr 27, 20:25 UTCApr 27, 22:45 UTC2h 20m
2026-04-26 CSS161 EHU → DEL Apr 26, 22:50 UTCApr 27, 22:45 UTC23h 55m
2026-04-26 CSS174 - Apr 26, 21:15 UTCApr 27, 20:45 UTC23h 30m
2026-04-26 CSS162 DEL → EHU Apr 26, 01:10 UTCApr 26, 19:10 UTC18h 0m
2026-04-25 CSS161 EHU → DEL Apr 25, 19:30 UTCApr 25, 22:25 UTC2h 55m
2026-04-24 CSS161 EHU → DEL Apr 24, 20:50 UTCApr 25, 20:45 UTC23h 55m
2026-04-24 CSS122 OSL → DAC Apr 24, 19:45 UTCApr 24, 21:10 UTC1h 25m
2026-04-24 CSS121 KGF → KGF Apr 24, 09:50 UTCApr 24, 17:25 UTC7h 35m
2026-04-22 CSS258 - Apr 22, 08:20 UTCApr 22, 09:00 UTC40m
2026-04-22 CSS257 - Apr 22, 04:45 UTCApr 22, 05:55 UTC1h 10m
2026-04-21 CSS6863 CAN → EHU Apr 21, 17:35 UTCApr 21, 17:45 UTC10m
2026-04-20 CSS148 - Apr 20, 11:25 UTCApr 20, 13:25 UTC2h 0m
2026-04-20 CSS239 ZUH → DEL Apr 20, 06:40 UTCApr 20, 09:05 UTC2h 25m
2026-04-20 CSS239 ZUH → DEL Apr 20, 03:50 UTCApr 20, 04:00 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-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 8h 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 CSS239, CSS161, CSS159, CSS240, CSS128.