Apparatus

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sensors Mode-S transponder

780657

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-5520 · BOEING 737-800

Hex
780657
Octal
36003127
Decimal
7,865,943
Country
CN
Tail
B-5520
Type
B738
No current signal · last broadcast 9d ago
Flights observed
47
Distinct callsigns
20
Country
CN
Last broadcast
9d ago

Last known position

Most recent position reported by Mode-S 780657.

Country allocation

The ICAO 24-bit address 780657 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
CHH7320 Hainan Airlines 4 2026-05-13
CHH7512 Hainan Airlines 3 2026-05-05
CHH7987 Hainan Airlines 2 2026-04-20
CHH7759 Hainan Airlines 2 2026-05-09
CHH7688 Hainan Airlines 2 2026-05-15
CHH7134 - 2 2026-04-23
CHH7988 Hainan Airlines 1 2026-04-20
CHH7883 - 1 2026-04-19
CHH7834 Hainan Airlines 1 2026-05-25
CHH7751 Hainan Airlines 1 2026-05-07
CHH7735 Hainan Airlines 1 2026-05-08
CHH7730 Hainan Airlines 1 2026-05-08
CHH7726 Hainan Airlines 1 2026-05-07
CHH7674 - 1 2026-04-21
CHH7654 Hainan Airlines 1 2026-05-13
CHH7638 Hainan Airlines 1 2026-04-16
CHH7613 Hainan Airlines 1 2026-04-23
CHH7582 Hainan Airlines 1 2026-05-21
CHH7580 Hainan Airlines 1 2026-05-20
CHH7447 Hainan Airlines 1 2026-05-19

Recent flights last 47

DateFlightRouteTakeoffLandingDuration
2026-05-25 CHH7834 TSN → URC May 25, 11:15 UTCMay 25, 11:35 UTC20m
2026-05-21 CHH7582 PEK → HAK May 21, 08:20 UTCMay 21, 08:30 UTC10m
2026-05-20 CHH7580 SYX → PEK May 20, 14:15 UTCMay 20, 14:25 UTC10m
2026-05-20 CHH7279 PEK → SYX May 20, 05:20 UTCMay 20, 05:35 UTC15m
2026-05-19 CHH7447 PEK → TFU May 19, 08:10 UTCMay 19, 08:30 UTC20m
2026-05-18 CHH7119 HAK → PVG May 18, 05:50 UTCMay 18, 06:05 UTC15m
2026-05-15 CHH7688 NGB → HAK May 15, 10:05 UTCMay 16, 02:35 UTC16h 29m
2026-05-14 CHH7688 NGB → HAK May 14, 23:55 UTCMay 15, 13:55 UTC14h 0m
2026-05-13 CHH7654 JUH → TYN May 13, 15:25 UTCMay 13, 15:55 UTC30m
2026-05-13 CHH7320 PVG → HAK May 13, 02:30 UTCMay 13, 13:05 UTC10h 35m
2026-05-12 CHH7320 PVG → HAK May 12, 09:40 UTCMay 13, 02:50 UTC17h 10m
2026-05-12 CHH7320 PVG → HAK May 12, 06:35 UTCMay 13, 02:50 UTC20h 15m
2026-05-12 CHH7320 PVG → HAK May 12, 03:50 UTCMay 13, 02:50 UTC23h 0m
2026-05-12 CHH7370 - May 12, 03:35 UTCMay 12, 12:35 UTC9h 0m
2026-05-11 CHH7045 ZUH → TYN May 11, 05:20 UTCMay 11, 05:35 UTC15m
2026-05-10 CHH7163 - May 10, 08:25 UTCMay 10, 08:45 UTC20m
2026-05-10 CHH7164 NKG → SZX May 10, 00:05 UTCMay 10, 05:40 UTC5h 35m
2026-05-09 CHH7759 SZX → TNA May 9, 09:05 UTCMay 9, 09:20 UTC15m
2026-05-09 CHH7759 SZX → TNA May 9, 06:40 UTCMay 9, 06:55 UTC15m
2026-05-08 CHH7735 SZX → CGO May 8, 22:35 UTCMay 8, 22:50 UTC15m
2026-05-08 CHH7730 RIZ → SZX May 8, 17:10 UTCMay 8, 17:20 UTC10m
2026-05-07 CHH7751 SZX → CTU May 7, 23:14 UTCMay 7, 23:24 UTC10m
2026-05-07 CHH7392 HGH → SZX May 7, 15:10 UTCMay 7, 15:20 UTC10m
2026-05-07 CHH7391 SZX → HGH May 7, 10:25 UTCMay 7, 10:35 UTC10m
2026-05-07 CHH7156 NKG → SZX May 7, 08:10 UTCMay 7, 08:30 UTC20m
2026-05-07 CHH7155 SZX → NKG May 7, 03:15 UTCMay 7, 03:25 UTC10m
2026-05-07 CHH7726 PVG → SZX May 7, 01:00 UTCMay 7, 01:15 UTC15m
2026-05-05 CHH7512 ZUH → XIY May 5, 03:50 UTCMay 5, 04:05 UTC15m
2026-05-02 CHH7322 PVG → SYX May 2, 23:55 UTCMay 3, 04:35 UTC4h 39m
2026-05-02 CHH7512 ZUH → XIY May 2, 03:45 UTCMay 2, 04:00 UTC15m
2026-05-01 CHH7512 ZUH → XIY May 1, 03:55 UTCMay 1, 04:05 UTC10m
2026-04-24 CHH6011 PEK → XIY Apr 24, 15:10 UTCApr 24, 15:30 UTC20m
2026-04-24 CHH7143 PEK → KHN Apr 24, 07:10 UTCApr 24, 07:20 UTC10m
2026-04-23 CHH7613 PEK → PVG Apr 23, 23:50 UTCApr 24, 00:00 UTC10m
2026-04-23 CHH7134 - Apr 23, 16:25 UTCApr 23, 16:35 UTC10m
2026-04-23 CHH7248 TFU → PEK Apr 23, 06:55 UTCApr 23, 07:05 UTC10m
2026-04-23 CHH7147 PEK → TFU Apr 23, 00:15 UTCApr 23, 00:35 UTC20m
2026-04-22 CHH7189 PEK → KWE Apr 22, 00:30 UTCApr 22, 09:30 UTC9h 0m
2026-04-21 CHH7674 - Apr 21, 14:10 UTCApr 21, 14:31 UTC20m
2026-04-20 CHH7134 - Apr 20, 16:15 UTCApr 20, 16:30 UTC15m
2026-04-20 CHH7133 - Apr 20, 12:20 UTCApr 20, 12:40 UTC20m
2026-04-20 CHH7988 TPE → PEK Apr 20, 05:20 UTCApr 20, 05:35 UTC15m
2026-04-20 CHH7987 PEK → TPE Apr 20, 02:20 UTCApr 20, 02:45 UTC25m
2026-04-20 CHH7987 PEK → TPE Apr 20, 00:00 UTCApr 20, 00:10 UTC10m
2026-04-19 CHH7109 PEK → JIQ Apr 19, 09:25 UTCApr 19, 09:50 UTC25m
2026-04-19 CHH7883 - Apr 19, 00:05 UTCApr 19, 00:25 UTC20m
2026-04-16 CHH7638 ZUH → CGO Apr 16, 06:00 UTCApr 16, 06:25 UTC25m

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-5520 page for operator, model, and routing details .

Mode-S 780657 frequently asked

What is Mode-S code 780657?
780657 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-5520.
Where is Mode-S 780657 registered?
Mode-S code 780657 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 780657 broadcasting right now?
No active broadcast right now. Last signal was 9d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 780657, octal 36003127, decimal 7,865,943.
What flights does 780657 operate?
Mode-S 780657 has broadcast 20 distinct callsigns, including CHH7320, CHH7512, CHH7987, CHH7759, CHH7688.