sensors Mode-S transponder

78239B

ICAO 24-bit transponder address · allocated to China

Hex
78239B
Octal
36021633
Decimal
7,873,435
Country
CN
No current signal · last broadcast 25d ago
Flights observed
36
Distinct callsigns
13
Country
CN
Last broadcast
25d ago

Last known position

Most recent position reported by Mode-S 78239B.

Country allocation

The ICAO 24-bit address 78239B 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 13 distinct

Callsign Airline Flights Last seen
CHH7384 - 8 2026-07-07
CHH7383 - 6 2026-07-08
CHH7306 - 3 2026-07-17
CHH7305 Hainan Airlines 3 2026-07-18
CHH7304 - 3 2026-07-05
CHH7579 - 2 2026-07-16
CHH7390 - 2 2026-07-13
CHH7364 - 2 2026-07-21
CHH6054 - 2 2026-07-13
CHH7360 Hainan Airlines 1 2026-07-21
CHH7310 - 1 2026-06-29
CHH7280 - 1 2026-07-12
CHH2996 - 1 2026-06-15

Recent flights last 36

DateFlightRouteTakeoffLandingDuration
2026-07-21 CHH7364 - Jul 21, 17:25 UTCJul 21, 17:40 UTC15m
2026-07-21 CHH7360 KWE → SYX Jul 21, 09:20 UTCJul 21, 09:40 UTC20m
2026-07-19 - - Jul 19, 12:15 UTCJul 19, 12:25 UTC10m
2026-07-18 CHH7305 SYX → TNA Jul 18, 01:05 UTCJul 18, 07:45 UTC6h 41m
2026-07-17 CHH7306 - Jul 17, 07:00 UTCJul 18, 01:15 UTC18h 15m
2026-07-16 CHH7579 - Jul 16, 13:25 UTCJul 17, 07:14 UTC17h 50m
2026-07-15 CHH7306 - Jul 15, 07:20 UTCJul 16, 01:10 UTC17h 50m
2026-07-15 CHH7305 - Jul 15, 01:00 UTCJul 15, 14:45 UTC13h 45m
2026-07-13 CHH7390 - Jul 13, 14:30 UTCJul 14, 07:20 UTC16h 50m
2026-07-13 CHH7390 - Jul 13, 10:05 UTCJul 14, 07:20 UTC21h 15m
2026-07-13 CHH6054 - Jul 13, 01:01 UTCJul 13, 14:35 UTC13h 35m
2026-07-12 CHH6054 - Jul 12, 16:15 UTCJul 13, 14:35 UTC22h 20m
2026-07-12 CHH7579 - Jul 12, 13:25 UTCJul 13, 10:05 UTC20h 40m
2026-07-12 CHH7280 - Jul 12, 08:35 UTCJul 12, 08:50 UTC15m
2026-07-11 CHH7306 - Jul 11, 01:10 UTCJul 11, 07:10 UTC6h 0m
2026-07-10 CHH7305 - Jul 10, 01:15 UTCJul 10, 01:25 UTC10m
2026-07-08 CHH7383 - Jul 8, 10:15 UTCJul 8, 15:45 UTC5h 30m
2026-07-07 CHH7384 - Jul 7, 14:35 UTCJul 8, 07:10 UTC16h 35m
2026-07-07 CHH7384 - Jul 7, 11:00 UTCJul 8, 07:10 UTC20h 10m
2026-07-07 CHH7383 - Jul 7, 10:00 UTCJul 8, 07:10 UTC21h 10m
2026-07-06 CHH7383 - Jul 6, 15:30 UTCJul 7, 11:00 UTC19h 30m
2026-07-06 CHH7383 - Jul 6, 10:20 UTCJul 6, 15:40 UTC5h 20m
2026-07-05 CHH7383 - Jul 5, 16:50 UTCJul 6, 15:40 UTC22h 50m
2026-07-05 CHH7304 - Jul 5, 07:05 UTCJul 5, 07:30 UTC25m
2026-07-02 CHH7384 - Jul 2, 15:40 UTCJul 3, 07:10 UTC15h 30m
2026-07-02 CHH7384 - Jul 2, 10:55 UTCJul 3, 07:10 UTC20h 15m
2026-07-02 CHH7384 - Jul 2, 10:10 UTCJul 3, 07:10 UTC21h 0m
2026-07-02 CHH7384 - Jul 2, 00:45 UTCJul 2, 16:10 UTC15h 25m
2026-07-01 CHH7383 - Jul 1, 15:05 UTCJul 2, 11:10 UTC20h 5m
2026-07-01 CHH7384 - Jul 1, 14:30 UTCJul 2, 11:10 UTC20h 40m
2026-07-01 CHH7384 - Jul 1, 10:00 UTCJul 2, 00:50 UTC14h 50m
2026-07-01 CHH7304 - Jul 1, 06:15 UTCJul 2, 00:50 UTC18h 35m
2026-07-01 CHH7304 - Jul 1, 01:30 UTCJul 2, 00:45 UTC23h 15m
2026-06-30 CHH7364 - Jun 30, 15:00 UTCJun 30, 15:20 UTC20m
2026-06-29 CHH7310 - Jun 29, 15:34 UTCJun 30, 09:35 UTC18h 0m
2026-06-15 CHH2996 - Jun 15, 10:24 UTCJun 15, 14:30 UTC4h 5m

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.

Mode-S 78239B frequently asked

What is Mode-S code 78239B?
78239B is an ICAO 24-bit transponder address. Allocated to China.
Where is Mode-S 78239B registered?
Mode-S code 78239B is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 78239B broadcasting right now?
No active broadcast right now. Last signal was 25d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 78239B, octal 36021633, decimal 7,873,435.
What flights does 78239B operate?
Mode-S 78239B has broadcast 13 distinct callsigns, including CHH7384, CHH7383, CHH7306, CHH7305, CHH7304.