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 9h ago
Flights observed
100
Distinct callsigns
20
Country
CN
Last broadcast
9h 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
CHH7987 - 4 2026-07-03
CHH7320 Hainan Airlines 4 2026-05-13
CHH7528 - 3 2026-06-22
CHH7512 Hainan Airlines 3 2026-05-05
CHH7134 - 3 2026-06-25
CHH7988 - 2 2026-07-03
CHH7759 Hainan Airlines 2 2026-05-09
CHH7750 - 2 2026-07-09
CHH7688 Hainan Airlines 2 2026-05-15
CHH7210 - 2 2026-06-21
CHH7164 Hainan Airlines 2 2026-06-09
CHH7133 - 2 2026-06-25
CHH7119 Hainan Airlines 2 2026-06-07
CHH7890 - 1 2026-07-03
CHH7889 - 1 2026-07-03
CHH7883 - 1 2026-04-19
CHH7874 - 1 2026-07-11
CHH7834 Hainan Airlines 1 2026-05-25
CHH7805 - 1 2026-07-15
CHH7777 - 1 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-19 CHH7308 - Jul 19, 00:05 UTCJul 19, 00:20 UTC15m
2026-07-18 CHH7132 SHA → CAN Jul 18, 08:20 UTCJul 18, 08:30 UTC10m
2026-07-15 CHH7805 - Jul 15, 02:45 UTCJul 15, 03:00 UTC15m
2026-07-13 CHH6246 - Jul 13, 06:15 UTCJul 13, 10:25 UTC4h 10m
2026-07-12 CHH7777 - Jul 12, 06:05 UTCJul 12, 06:25 UTC20m
2026-07-12 CHH7138 - Jul 12, 03:40 UTCJul 12, 04:10 UTC30m
2026-07-11 CHH7874 - Jul 11, 09:20 UTCJul 11, 09:35 UTC15m
2026-07-11 CHH7394 - Jul 11, 05:55 UTCJul 11, 06:05 UTC10m
2026-07-11 CHH7393 - Jul 11, 00:00 UTCJul 11, 00:10 UTC10m
2026-07-10 CHH7312 - Jul 10, 03:10 UTCJul 10, 13:05 UTC9h 55m
2026-07-09 CHH7750 - Jul 9, 16:50 UTCJul 10, 13:05 UTC20h 15m
2026-07-09 CHH7744 - Jul 9, 14:10 UTCJul 9, 14:55 UTC45m
2026-07-04 CHH7129 - Jul 4, 14:15 UTCJul 4, 14:25 UTC10m
2026-07-04 CHH7179 - Jul 4, 01:50 UTCJul 4, 02:10 UTC20m
2026-07-03 CHH7890 - Jul 3, 17:05 UTCJul 3, 17:15 UTC10m
2026-07-03 CHH7889 - Jul 3, 11:10 UTCJul 3, 11:25 UTC15m
2026-07-03 CHH7988 - Jul 3, 05:15 UTCJul 3, 05:40 UTC25m
2026-07-03 CHH7987 - Jul 3, 02:45 UTCJul 3, 03:25 UTC40m
2026-07-03 CHH7987 - Jul 3, 00:35 UTCJul 3, 00:45 UTC10m
2026-07-02 CHH440 - Jul 2, 06:15 UTCJul 2, 08:25 UTC2h 10m
2026-07-02 CHH439 - Jul 2, 01:10 UTCJul 2, 03:00 UTC1h 50m
2026-06-26 CHH7185 - Jun 26, 23:09 UTCJun 26, 23:30 UTC20m
2026-06-26 CHH7644 - Jun 26, 09:05 UTCJun 26, 09:14 UTC10m
2026-06-25 CHH7105 PEK → DLC Jun 25, 23:05 UTCJun 25, 23:14 UTC10m
2026-06-25 CHH7134 - Jun 25, 15:29 UTCJun 25, 15:44 UTC15m
2026-06-25 CHH7133 - Jun 25, 12:35 UTCJun 25, 12:54 UTC20m
2026-06-25 CHH7080 SYX → PEK Jun 25, 06:44 UTCJun 25, 07:09 UTC25m
2026-06-24 CHH7305 - Jun 24, 00:59 UTCJun 24, 06:59 UTC6h 0m
2026-06-22 CHH7528 - Jun 22, 02:54 UTCJun 22, 12:59 UTC10h 5m
2026-06-21 CHH7528 - Jun 21, 15:49 UTCJun 22, 12:59 UTC21h 10m
2026-06-21 CHH7527 - Jun 21, 09:49 UTCJun 22, 09:45 UTC23h 55m
2026-06-21 CHH7210 - Jun 21, 09:40 UTCJun 22, 05:40 UTC20h 0m
2026-06-21 CHH7210 - Jun 21, 04:04 UTCJun 22, 02:54 UTC22h 50m
2026-06-20 CHH7528 - Jun 20, 02:54 UTCJun 20, 13:09 UTC10h 15m
2026-06-19 CHH7750 - Jun 19, 15:24 UTCJun 19, 15:34 UTC10m
2026-06-19 CHH7732 - Jun 19, 12:09 UTCJun 19, 12:25 UTC15m
2026-06-19 CHH7731 - Jun 19, 01:24 UTCJun 19, 01:34 UTC10m
2026-06-18 CHH7746 - Jun 18, 18:55 UTCJun 18, 19:10 UTC15m
2026-06-17 CHH6394 - Jun 17, 15:15 UTCJun 17, 15:30 UTC15m
2026-06-17 CHH7264 - Jun 17, 08:20 UTCJun 17, 08:30 UTC10m
2026-06-16 CHH7026 SZX → HAK Jun 16, 15:24 UTCJun 16, 15:40 UTC15m
2026-06-16 CHH7375 - Jun 16, 08:10 UTCJun 16, 08:25 UTC15m
2026-06-16 CHH7738 NNY → SZX Jun 16, 03:20 UTCJun 16, 03:30 UTC10m
2026-06-15 CHH7737 SZX → NNY Jun 15, 22:49 UTCJun 15, 22:59 UTC10m
2026-06-15 CHH7749 SYX → SZX Jun 15, 18:40 UTCJun 15, 18:50 UTC10m
2026-06-15 CHH7388 KHN → SYX Jun 15, 15:19 UTCJun 15, 15:45 UTC25m
2026-06-09 CHH7535 PEK → CSX Jun 9, 15:20 UTCJun 9, 15:35 UTC15m
2026-06-09 CHH7164 NKG → SZX Jun 9, 05:05 UTCJun 9, 08:25 UTC3h 20m
2026-06-09 CHH7291 - Jun 9, 00:10 UTCJun 9, 00:20 UTC10m
2026-06-07 CHH7011 HAK → CAN Jun 7, 15:25 UTCJun 7, 15:55 UTC30m

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 9h 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 CHH7987, CHH7320, CHH7528, CHH7512, CHH7134.