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sensors Mode-S transponder

781FF2

ICAO 24-bit transponder address · allocated to China

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

Hex
781FF2
Octal
36017762
Decimal
7,872,498
Country
CN
Tail
B-223Z
Type
B763
No current signal · last broadcast 13h ago
Flights observed
116
Distinct callsigns
20
Country
CN
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S 781FF2.

Country allocation

The ICAO 24-bit address 781FF2 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
CSS253 - 7 2026-07-01
CSS173 - 7 2026-07-12
CSS168 - 7 2026-07-20
CSS7223 - 6 2026-06-16
CSS159 - 6 2026-07-04
CSS364 - 4 2026-06-19
CSS363 SF Airlines 4 2026-06-18
CSS254 - 4 2026-07-01
CSS240 - 4 2026-07-21
CSS167 - 4 2026-07-19
CSS158 - 4 2026-07-05
CSS7635 - 3 2026-07-15
CSS6835 SF Airlines 3 2026-06-16
CSS239 SF Airlines 3 2026-07-21
CSS7672 - 2 2026-06-21
CSS7636 - 2 2026-07-08
CSS6864 - 2 2026-07-15
CSS6844 - 2 2026-06-21
CSS6806 - 2 2026-07-17
CSS6801 SF Airlines 2 2026-06-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-21 CSS160 - Jul 21, 14:25 UTCJul 21, 17:15 UTC2h 50m
2026-07-21 CSS239 ZUH → DEL Jul 21, 08:35 UTCJul 21, 12:40 UTC4h 5m
2026-07-21 CSS240 - Jul 21, 00:30 UTCJul 21, 03:10 UTC2h 40m
2026-07-20 CSS161 - Jul 20, 07:35 UTCJul 20, 22:45 UTC15h 10m
2026-07-20 CSS168 - Jul 20, 00:10 UTCJul 20, 03:25 UTC3h 15m
2026-07-19 CSS167 DEL → DEL Jul 19, 09:20 UTCJul 19, 22:40 UTC13h 20m
2026-07-19 CSS165 NQZ → NQZ Jul 19, 04:35 UTCJul 19, 07:10 UTC2h 35m
2026-07-18 CSS6803 - Jul 18, 17:25 UTCJul 18, 17:35 UTC10m
2026-07-17 CSS6806 - Jul 17, 20:50 UTCJul 17, 21:05 UTC15m
2026-07-15 CSS6864 - Jul 15, 21:35 UTCJul 15, 21:45 UTC10m
2026-07-15 CSS7635 - Jul 15, 16:40 UTCJul 15, 16:50 UTC10m
2026-07-14 CSS7635 - Jul 14, 22:05 UTCJul 15, 16:50 UTC18h 44m
2026-07-12 CSS174 - Jul 12, 20:35 UTCJul 12, 23:50 UTC3h 15m
2026-07-12 CSS173 - Jul 12, 17:50 UTCJul 12, 18:05 UTC15m
2026-07-12 CSS173 - Jul 12, 15:10 UTCJul 12, 17:05 UTC1h 55m
2026-07-10 CSS7635 - Jul 10, 21:50 UTCJul 11, 16:20 UTC18h 30m
2026-07-10 CSS248 - Jul 10, 12:10 UTCJul 10, 22:10 UTC10h 1m
2026-07-10 CSS248 - Jul 10, 09:10 UTCJul 10, 09:20 UTC10m
2026-07-10 CSS247 - Jul 10, 06:30 UTCJul 10, 06:40 UTC10m
2026-07-09 CSS247 - Jul 9, 15:55 UTCJul 10, 03:55 UTC12h 0m
2026-07-08 CSS7636 - Jul 8, 22:00 UTCJul 9, 16:10 UTC18h 10m
2026-07-07 CSS237 - Jul 7, 01:30 UTCJul 7, 08:55 UTC7h 25m
2026-07-05 CSS158 - Jul 5, 10:20 UTCJul 5, 13:10 UTC2h 50m
2026-07-04 CSS240 DEL → DEL Jul 4, 20:30 UTCJul 5, 08:35 UTC12h 5m
2026-07-04 CSS159 - Jul 4, 07:10 UTCJul 4, 18:30 UTC11h 20m
2026-07-04 CSS168 - Jul 4, 03:55 UTCJul 4, 04:20 UTC25m
2026-07-04 CSS168 - Jul 4, 00:15 UTCJul 4, 03:25 UTC3h 10m
2026-07-03 CSS167 - Jul 3, 19:45 UTCJul 3, 22:40 UTC2h 55m
2026-07-01 CSS254 - Jul 1, 07:05 UTCJul 1, 10:10 UTC3h 5m
2026-07-01 CSS253 - Jul 1, 04:50 UTCJul 1, 05:15 UTC25m
2026-07-01 CSS253 - Jul 1, 02:05 UTCJul 1, 04:15 UTC2h 10m
2026-06-29 CSS168 - Jun 29, 06:59 UTCJun 29, 07:25 UTC25m
2026-06-29 CSS168 - Jun 29, 00:20 UTCJun 29, 02:54 UTC2h 35m
2026-06-28 CSS167 - Jun 28, 19:44 UTCJun 28, 22:29 UTC2h 45m
2026-06-27 CSS7103 - Jun 27, 16:44 UTCJun 27, 16:59 UTC15m
2026-06-26 CSS254 - Jun 26, 07:24 UTCJun 26, 10:35 UTC3h 10m
2026-06-26 CSS253 - Jun 26, 02:24 UTCJun 26, 05:10 UTC2h 45m
2026-06-21 CSS7672 - Jun 21, 11:10 UTCJun 21, 11:20 UTC10m
2026-06-21 CSS6844 - Jun 21, 00:40 UTCJun 21, 00:59 UTC20m
2026-06-20 CSS7672 - Jun 20, 12:24 UTCJun 20, 12:34 UTC10m
2026-06-20 CSS358 - Jun 20, 01:34 UTCJun 20, 02:49 UTC1h 15m
2026-06-19 CSS357 - Jun 19, 22:39 UTCJun 20, 00:04 UTC1h 25m
2026-06-19 CSS364 - Jun 19, 06:14 UTCJun 19, 06:24 UTC10m
2026-06-19 CSS364 - Jun 19, 02:19 UTCJun 19, 03:55 UTC1h 35m
2026-06-18 CSS363 SZX → NRT Jun 18, 22:35 UTCJun 19, 00:20 UTC1h 44m
2026-06-18 CSS363 SZX → NRT Jun 18, 20:25 UTCJun 18, 20:35 UTC10m
2026-06-18 CSS6844 - Jun 18, 01:35 UTCJun 18, 01:45 UTC10m
2026-06-17 CSS6852 HGH → SZX Jun 17, 01:20 UTCJun 17, 01:35 UTC15m
2026-06-16 CSS6835 SZX → HGH Jun 16, 20:50 UTCJun 16, 21:00 UTC10m
2026-06-16 CSS7223 - Jun 16, 18:50 UTCJun 16, 19:00 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-223Z page for operator, model, and routing details .

Mode-S 781FF2 frequently asked

What is Mode-S code 781FF2?
781FF2 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-223Z.
Where is Mode-S 781FF2 registered?
Mode-S code 781FF2 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781FF2 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781FF2, octal 36017762, decimal 7,872,498.
What flights does 781FF2 operate?
Mode-S 781FF2 has broadcast 20 distinct callsigns, including CSS253, CSS173, CSS168, CSS7223, CSS159.