Apparatus

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sensors Mode-S transponder

781872

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20E6 · BOEING 737-800

Hex
781872
Octal
36014162
Decimal
7,870,578
Country
CN
Tail
B-20E6
Type
B738
No current signal · last broadcast 22h ago
Flights observed
103
Distinct callsigns
20
Country
CN
Last broadcast
22h ago

Last known position

Most recent position reported by Mode-S 781872.

Country allocation

The ICAO 24-bit address 781872 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
CHH7312 Hainan Airlines 13 2026-06-13
CHH7743 Hainan Airlines 9 2026-06-13
CHH7750 Hainan Airlines 8 2026-06-12
CHH7075 - 8 2026-07-15
CHH7045 - 7 2026-07-16
CHH7749 Hainan Airlines 5 2026-06-06
CHH7653 - 5 2026-06-26
CHH7744 Hainan Airlines 4 2026-06-07
CHH7374 Hainan Airlines 4 2026-05-11
CHH6034 Hainan Airlines 3 2026-06-05
CHH6033 Hainan Airlines 3 2026-06-05
CHH7765 Hainan Airlines 2 2026-05-17
CHH7668 Hainan Airlines 2 2026-05-03
CHH7654 - 2 2026-06-26
CHH7370 - 2 2026-07-06
CHH7369 - 2 2026-07-17
CHH7311 Hainan Airlines 2 2026-06-06
CHH7076 - 2 2026-07-13
CHH7026 Hainan Airlines 2 2026-05-18
CHH7764 Hainan Airlines 1 2026-04-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CHH7369 - Jul 17, 00:45 UTCJul 17, 04:04 UTC3h 20m
2026-07-16 CHH7045 - Jul 16, 07:05 UTCJul 16, 07:20 UTC15m
2026-07-15 CHH7075 - Jul 15, 00:45 UTCJul 15, 05:05 UTC4h 20m
2026-07-14 CHH7045 - Jul 14, 05:25 UTCJul 14, 05:40 UTC15m
2026-07-13 CHH7076 - Jul 13, 04:00 UTCJul 13, 04:15 UTC15m
2026-07-13 CHH7075 - Jul 13, 00:30 UTCJul 13, 00:45 UTC15m
2026-07-10 CHH7369 - Jul 10, 00:35 UTCJul 10, 04:20 UTC3h 45m
2026-07-09 CHH7045 - Jul 9, 06:25 UTCJul 9, 06:35 UTC10m
2026-07-08 CHH7094 - Jul 8, 12:15 UTCJul 8, 12:25 UTC10m
2026-07-08 CHH7076 - Jul 8, 05:20 UTCJul 8, 06:00 UTC40m
2026-07-08 CHH7075 - Jul 8, 01:00 UTCJul 8, 01:20 UTC20m
2026-07-07 - - Jul 7, 14:35 UTCJul 7, 14:40 UTC5m
2026-07-06 CHH7370 - Jul 6, 04:15 UTCJul 6, 04:25 UTC10m
2026-07-05 CHH7045 - Jul 5, 05:35 UTCJul 5, 05:45 UTC10m
2026-07-04 CHH7075 - Jul 4, 00:25 UTCJul 4, 12:20 UTC11h 55m
2026-07-03 CHH7075 - Jul 3, 09:45 UTCJul 4, 04:30 UTC18h 45m
2026-07-03 CHH7075 - Jul 3, 04:35 UTCJul 4, 04:30 UTC23h 55m
2026-07-03 CHH7075 - Jul 3, 04:25 UTCJul 4, 00:45 UTC20h 20m
2026-07-01 CHH7022 CAN → SYX Jul 1, 01:00 UTCJul 1, 01:10 UTC10m
2026-06-30 CHH7021 - Jun 30, 23:15 UTCJun 30, 23:30 UTC15m
2026-06-29 CHH7370 - Jun 29, 00:29 UTCJun 29, 10:34 UTC10h 5m
2026-06-26 CHH7654 - Jun 26, 15:20 UTCJun 27, 10:29 UTC19h 10m
2026-06-26 CHH7653 - Jun 26, 12:44 UTCJun 27, 10:29 UTC21h 45m
2026-06-26 CHH7653 - Jun 26, 09:39 UTCJun 27, 06:44 UTC21h 5m
2026-06-26 CHH7653 - Jun 26, 04:45 UTCJun 27, 03:44 UTC23h 0m
2026-06-25 CHH7653 - Jun 25, 15:10 UTCJun 26, 13:04 UTC21h 55m
2026-06-25 CHH6223 URC → PEK Jun 25, 05:00 UTCJun 25, 05:20 UTC20m
2026-06-13 CHH7743 NGB → CGQ Jun 13, 23:45 UTCJun 13, 23:55 UTC10m
2026-06-13 CHH7312 KHN → SYX Jun 13, 01:10 UTCJun 13, 12:35 UTC11h 24m
2026-06-12 CHH7750 SZX → SYX Jun 12, 15:10 UTCJun 12, 15:20 UTC10m
2026-06-11 CHH7743 NGB → CGQ Jun 11, 23:50 UTCJun 12, 00:00 UTC10m
2026-06-11 CHH7312 KHN → SYX Jun 11, 01:40 UTCJun 11, 13:20 UTC11h 40m
2026-06-10 CHH7312 KHN → SYX Jun 10, 16:05 UTCJun 11, 13:20 UTC21h 15m
2026-06-09 CHH7306 TFU → SYX Jun 9, 01:50 UTCJun 9, 08:00 UTC6h 10m
2026-06-07 CHH7750 SZX → SYX Jun 7, 16:10 UTCJun 8, 01:30 UTC9h 20m
2026-06-07 CHH7744 SZX → LIY Jun 7, 14:20 UTCJun 7, 14:50 UTC30m
2026-06-06 CHH7743 NGB → CGQ Jun 6, 23:50 UTCJun 7, 00:00 UTC10m
2026-06-06 CHH7749 SYX → SZX Jun 6, 18:45 UTCJun 6, 19:04 UTC20m
2026-06-06 CHH7311 SYX → KHN Jun 6, 01:55 UTCJun 6, 12:10 UTC10h 15m
2026-06-05 CHH6034 FOC → ZUH Jun 5, 14:50 UTCJun 5, 15:05 UTC15m
2026-06-05 CHH6033 ZUH → FOC Jun 5, 11:25 UTCJun 5, 11:35 UTC10m
2026-06-03 CHH7326 WMT → SYX Jun 3, 05:55 UTCJun 4, 01:10 UTC19h 15m
2026-06-02 CHH7750 SZX → SYX Jun 2, 15:15 UTCJun 2, 15:25 UTC10m
2026-06-01 CHH7743 NGB → CGQ Jun 1, 23:05 UTCJun 1, 23:15 UTC10m
2026-06-01 CHH7749 SYX → SZX Jun 1, 16:10 UTCJun 1, 16:25 UTC15m
2026-06-01 CHH7312 KHN → SYX Jun 1, 01:25 UTCJun 1, 12:20 UTC10h 55m
2026-05-31 CHH6034 FOC → ZUH May 31, 13:20 UTCMay 31, 13:45 UTC25m
2026-05-31 CHH6033 ZUH → FOC May 31, 10:10 UTCMay 31, 10:45 UTC35m
2026-05-30 CHH7325 SYX → WMT May 30, 00:45 UTCMay 30, 05:55 UTC5h 10m
2026-05-29 CHH6032 ZUH → SYX May 29, 15:20 UTCMay 29, 15:25 UTC5m

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-20E6 page for operator, model, and routing details .

Mode-S 781872 frequently asked

What is Mode-S code 781872?
781872 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20E6.
Where is Mode-S 781872 registered?
Mode-S code 781872 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781872 broadcasting right now?
No active broadcast right now. Last signal was 22h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781872, octal 36014162, decimal 7,870,578.
What flights does 781872 operate?
Mode-S 781872 has broadcast 20 distinct callsigns, including CHH7312, CHH7743, CHH7750, CHH7075, CHH7045.