Apparatus

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sensors Mode-S transponder

780840

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-5638 · BOEING 737-800

Hex
780840
Octal
36004100
Decimal
7,866,432
Country
CN
Tail
B-5638
Type
B738
No current signal · last broadcast 15h ago
Flights observed
49
Distinct callsigns
20
Country
CN
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S 780840.

Country allocation

The ICAO 24-bit address 780840 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
CHH7016 Hainan Airlines 4 2026-05-29
CHH7741 Hainan Airlines 2 2026-05-11
CHH7722 Hainan Airlines 2 2026-04-16
CHH7374 Hainan Airlines 2 2026-05-12
CHH7256 - 2 2026-04-16
CHH7255 Hainan Airlines 2 2026-04-16
CHH7109 Hainan Airlines 2 2026-05-08
CHH7015 Hainan Airlines 2 2026-05-29
CHH7889 Hainan Airlines 1 2026-05-06
CHH7884 - 1 2026-05-08
CHH7883 - 1 2026-05-08
CHH7770 - 1 2026-04-15
CHH7769 - 1 2026-04-15
CHH7736 Hainan Airlines 1 2026-04-17
CHH7721 Hainan Airlines 1 2026-04-16
CHH7698 Hainan Airlines 1 2026-04-20
CHH7688 Hainan Airlines 1 2026-04-22
CHH7674 - 1 2026-04-25
CHH7673 - 1 2026-04-25
CHH7654 - 1 2026-04-13

Recent flights last 49

DateFlightRouteTakeoffLandingDuration
2026-05-29 CHH7015 HAK → SZX May 29, 13:30 UTCMay 29, 14:00 UTC30m
2026-05-29 CHH7016 SZX → HAK May 29, 09:05 UTCMay 29, 09:25 UTC20m
2026-05-24 CHH7488 CGQ → HGH May 24, 15:10 UTCMay 24, 15:55 UTC45m
2026-05-23 CHH7016 SZX → HAK May 23, 08:35 UTCMay 23, 11:55 UTC3h 20m
2026-05-22 CHH7016 SZX → HAK May 22, 08:45 UTCMay 22, 12:00 UTC3h 15m
2026-05-21 CHH7377 PEK → HGH May 21, 14:35 UTCMay 21, 14:45 UTC10m
2026-05-21 CHH7348 TFU → PEK May 21, 12:15 UTCMay 21, 12:25 UTC10m
2026-05-21 CHH7247 PEK → TFU May 21, 05:25 UTCMay 21, 05:40 UTC15m
2026-05-17 CHH7638 ZUH → CGO May 17, 05:40 UTCMay 17, 05:50 UTC10m
2026-05-16 CHH7164 NKG → SZX May 16, 05:10 UTCMay 16, 08:41 UTC3h 31m
2026-05-12 CHH7374 HFE → SYX May 12, 13:40 UTCMay 12, 14:00 UTC20m
2026-05-11 CHH7374 HFE → SYX May 11, 15:35 UTCMay 12, 14:00 UTC22h 26m
2026-05-11 CHH7741 SZX → KWE May 11, 04:20 UTCMay 11, 04:30 UTC10m
2026-05-09 CHH7582 PEK → HAK May 9, 08:20 UTCMay 9, 08:40 UTC20m
2026-05-09 CHH7167 PEK → CKG May 9, 00:15 UTCMay 9, 00:30 UTC15m
2026-05-08 CHH7109 PEK → JIQ May 8, 09:25 UTCMay 8, 09:39 UTC15m
2026-05-08 CHH7884 - May 8, 06:25 UTCMay 8, 06:35 UTC10m
2026-05-08 CHH7883 - May 8, 00:05 UTCMay 8, 00:25 UTC20m
2026-05-07 CHH7607 PEK → SHA May 7, 09:05 UTCMay 7, 09:15 UTC10m
2026-05-07 CHH6009 YNT → HAK May 7, 00:45 UTCMay 7, 00:55 UTC10m
2026-05-06 CHH7889 PEK → YZY May 6, 12:10 UTCMay 6, 12:20 UTC10m
2026-05-06 CHH7238 XIY → PEK May 6, 08:05 UTCMay 6, 08:25 UTC20m
2026-05-06 CHH7237 PEK → XIY May 6, 03:35 UTCMay 6, 03:55 UTC20m
2026-05-05 CHH6394 - May 5, 15:05 UTCMay 5, 15:15 UTC10m
2026-05-04 CHH7016 SZX → HAK May 4, 08:55 UTCMay 4, 09:20 UTC25m
2026-04-30 CHH7468 ZUH → HGH Apr 30, 08:25 UTCApr 30, 08:35 UTC10m
2026-04-29 CHH7015 HAK → SZX Apr 29, 12:00 UTCApr 29, 12:15 UTC15m
2026-04-27 CHH7337 PEK → XIY Apr 27, 14:30 UTCApr 27, 14:45 UTC15m
2026-04-26 CHH7185 PEK → YIH Apr 26, 23:05 UTCApr 26, 23:25 UTC20m
2026-04-26 CHH7109 PEK → JIQ Apr 26, 09:15 UTCApr 26, 09:25 UTC10m
2026-04-25 CHH7674 - Apr 25, 14:05 UTCApr 25, 14:15 UTC10m
2026-04-25 CHH7673 - Apr 25, 09:40 UTCApr 25, 09:55 UTC15m
2026-04-25 CHH7189 PEK → KWE Apr 25, 00:40 UTCApr 25, 01:05 UTC25m
2026-04-24 CHH6012 XIY → PEK Apr 24, 14:00 UTCApr 24, 14:20 UTC20m
2026-04-22 CHH7688 NGB → HAK Apr 22, 23:25 UTCApr 23, 10:10 UTC10h 45m
2026-04-22 CHH7648 SHE → HAK Apr 22, 12:35 UTCApr 23, 10:10 UTC21h 35m
2026-04-21 CHH7741 SZX → KWE Apr 21, 04:00 UTCApr 21, 04:10 UTC10m
2026-04-20 CHH7698 NKG → SYX Apr 20, 05:15 UTCApr 20, 09:00 UTC3h 45m
2026-04-17 CHH7736 CGO → SZX Apr 17, 06:45 UTCApr 17, 07:00 UTC15m
2026-04-16 CHH7256 - Apr 16, 16:15 UTCApr 16, 16:55 UTC40m
2026-04-16 CHH7255 SZX → NKG Apr 16, 10:29 UTCApr 16, 10:45 UTC15m
2026-04-16 CHH7722 PVG → SZX Apr 16, 07:45 UTCApr 16, 08:09 UTC25m
2026-04-16 CHH7721 SZX → PVG Apr 16, 01:40 UTCApr 16, 01:50 UTC10m
2026-04-15 CHH7770 - Apr 15, 09:55 UTCApr 15, 10:05 UTC10m
2026-04-15 CHH7769 - Apr 15, 00:00 UTCApr 15, 00:10 UTC10m
2026-04-14 CHH7256 - Apr 14, 16:25 UTCApr 14, 16:45 UTC20m
2026-04-14 CHH7255 SZX → NKG Apr 14, 11:10 UTCApr 14, 11:20 UTC10m
2026-04-14 CHH7722 PVG → SZX Apr 14, 08:40 UTCApr 14, 09:00 UTC20m
2026-04-13 CHH7654 - Apr 13, 12:20 UTCApr 13, 15:40 UTC3h 20m

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-5638 page for operator, model, and routing details .

Mode-S 780840 frequently asked

What is Mode-S code 780840?
780840 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-5638.
Where is Mode-S 780840 registered?
Mode-S code 780840 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 780840 broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 780840, octal 36004100, decimal 7,866,432.
What flights does 780840 operate?
Mode-S 780840 has broadcast 20 distinct callsigns, including CHH7016, CHH7741, CHH7722, CHH7374, CHH7256.