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 Jul 24, 22:50 UTC
Flights observed
106
Distinct callsigns
20
Country
CN
Last broadcast
Jul 24, 22:50 UTC

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 - 6 2026-06-26
CHH7179 - 3 2026-07-16
CHH7109 - 3 2026-07-15
CHH7987 - 2 2026-06-29
CHH7805 Hainan Airlines 2 2026-06-10
CHH7801 - 2 2026-07-11
CHH7775 Hainan Airlines 2 2026-07-24
CHH7746 - 2 2026-07-23
CHH7741 Hainan Airlines 2 2026-05-11
CHH7722 Hainan Airlines 2 2026-04-16
CHH7644 - 2 2026-07-06
CHH7638 - 2 2026-07-14
CHH7582 - 2 2026-07-21
CHH7528 - 2 2026-07-18
CHH7374 Hainan Airlines 2 2026-05-12
CHH7256 - 2 2026-04-16
CHH7255 Hainan Airlines 2 2026-04-16
CHH7015 Hainan Airlines 2 2026-05-29
CHH7988 - 1 2026-06-29
CHH7889 Hainan Airlines 1 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 CHH7739 SZX → TYN Jul 24, 22:40 UTCJul 24, 22:50 UTC10m
2026-07-24 - - Jul 24, 18:30 UTCJul 24, 18:45 UTC15m
2026-07-24 CHH7776 TYN → SZX Jul 24, 14:35 UTCJul 24, 14:55 UTC20m
2026-07-24 CHH7775 SZX → TYN Jul 24, 10:55 UTCJul 24, 11:15 UTC20m
2026-07-24 CHH7775 SZX → TYN Jul 24, 07:15 UTCJul 24, 07:25 UTC10m
2026-07-24 CHH7752 CTU → SZX Jul 24, 05:15 UTCJul 24, 05:25 UTC10m
2026-07-23 CHH7746 - Jul 23, 06:30 UTCJul 23, 09:35 UTC3h 5m
2026-07-22 CHH7567 - Jul 22, 11:35 UTCJul 22, 12:00 UTC25m
2026-07-21 CHH7582 - Jul 21, 08:20 UTCJul 21, 08:35 UTC15m
2026-07-21 CHH6355 - Jul 21, 01:25 UTCJul 21, 01:40 UTC15m
2026-07-19 CHH7120 PVG → HAK Jul 19, 06:25 UTCJul 19, 12:20 UTC5h 55m
2026-07-18 CHH7528 - Jul 18, 10:05 UTCJul 19, 06:35 UTC20h 30m
2026-07-18 CHH7528 - Jul 18, 05:40 UTCJul 18, 10:25 UTC4h 45m
2026-07-17 CHH7210 - Jul 17, 04:10 UTCJul 17, 09:45 UTC5h 35m
2026-07-16 CHH7815 - Jul 16, 12:40 UTCJul 17, 09:45 UTC21h 5m
2026-07-16 CHH7179 - Jul 16, 01:55 UTCJul 16, 02:10 UTC15m
2026-07-15 CHH7109 - Jul 15, 09:25 UTCJul 15, 09:40 UTC15m
2026-07-15 CHH6384 - Jul 15, 07:20 UTCJul 15, 07:45 UTC25m
2026-07-14 CHH7638 - Jul 14, 07:30 UTCJul 14, 07:40 UTC10m
2026-07-13 CHH7179 - Jul 13, 01:35 UTCJul 13, 01:55 UTC20m
2026-07-12 CHH7125 - Jul 12, 12:15 UTCJul 12, 12:25 UTC10m
2026-07-12 CHH713V - Jul 12, 01:00 UTCJul 12, 01:20 UTC20m
2026-07-11 CHH7801 - Jul 11, 00:40 UTCJul 11, 01:00 UTC20m
2026-07-10 - - Jul 10, 15:55 UTCJul 10, 16:05 UTC10m
2026-07-09 CHH7101 - Jul 9, 09:55 UTCJul 9, 10:05 UTC10m
2026-07-06 CHH7644 - Jul 6, 11:10 UTCJul 6, 11:20 UTC10m
2026-07-02 CHH6246 - Jul 2, 09:55 UTCJul 2, 10:20 UTC25m
2026-06-30 CHH7103 - Jun 30, 17:00 UTCJun 30, 17:10 UTC10m
2026-06-30 CHH7163 - Jun 30, 08:25 UTCJun 30, 08:35 UTC10m
2026-06-29 CHH7082 - Jun 29, 11:20 UTCJun 30, 08:35 UTC21h 16m
2026-06-29 CHH7988 - Jun 29, 05:20 UTCJun 29, 05:40 UTC20m
2026-06-29 CHH7987 - Jun 29, 02:25 UTCJun 29, 02:54 UTC30m
2026-06-29 CHH7987 - Jun 29, 00:00 UTCJun 29, 00:14 UTC15m
2026-06-28 CHH7188 - Jun 28, 12:35 UTCJun 28, 12:44 UTC10m
2026-06-28 CHH7187 - Jun 28, 00:39 UTCJun 28, 08:34 UTC7h 55m
2026-06-27 CHH7235 - Jun 27, 03:09 UTCJun 27, 03:25 UTC15m
2026-06-26 CHH7016 - Jun 26, 10:05 UTCJun 26, 12:50 UTC2h 45m
2026-06-24 CHH7322 - Jun 24, 23:50 UTCJun 25, 04:40 UTC4h 50m
2026-06-21 CHH7137 - Jun 21, 23:05 UTCJun 21, 23:24 UTC20m
2026-06-21 CHH7191 - Jun 21, 00:19 UTCJun 21, 00:34 UTC15m
2026-06-20 CHH7179 - Jun 20, 01:44 UTCJun 20, 07:59 UTC6h 15m
2026-06-19 CHH7710 - Jun 19, 11:09 UTCJun 19, 11:20 UTC10m
2026-06-19 CHH7705 - Jun 19, 09:04 UTCJun 19, 09:14 UTC10m
2026-06-16 CHH7303 SYX → TFU Jun 16, 01:35 UTCJun 16, 05:50 UTC4h 15m
2026-06-14 CHH7388 KHN → SYX Jun 14, 14:45 UTCJun 14, 15:00 UTC15m
2026-06-12 CHH7052 HGH → HAK Jun 12, 01:15 UTCJun 12, 13:25 UTC12h 10m
2026-06-11 CHH7807 PEK → CAN Jun 11, 04:40 UTCJun 11, 05:00 UTC20m
2026-06-10 CHH7805 PEK → CAN Jun 10, 02:45 UTCJun 10, 03:05 UTC20m
2026-06-09 CHH7801 PEK → CAN Jun 9, 00:45 UTCJun 9, 01:05 UTC20m
2026-06-07 CHH7644 ZUH → HFE Jun 7, 10:00 UTCJun 7, 10:15 UTC15m

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 Jul 24, 22:50 UTC.
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, CHH7179, CHH7109, CHH7987, CHH7805.