Apparatus

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sensors Mode-S transponder

781871

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20E5 · BOEING 737-800

Hex
781871
Octal
36014161
Decimal
7,870,577
Country
CN
Tail
B-20E5
Type
B738
No current signal · last broadcast 18h ago
Flights observed
66
Distinct callsigns
20
Country
CN
Last broadcast
18h ago

Last known position

Most recent position reported by Mode-S 781871.

Country allocation

The ICAO 24-bit address 781871 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
CHH7045 - 12 2026-07-17
CHH7744 - 7 2026-06-28
CHH7374 Hainan Airlines 4 2026-06-19
CHH7765 - 3 2026-06-30
CHH7750 Hainan Airlines 3 2026-06-14
CHH7312 - 3 2026-06-25
CHH7075 - 3 2026-07-14
CHH7370 - 2 2026-07-03
CHH7027 - 2 2026-06-30
CHH7026 - 2 2026-07-01
CHH7022 - 2 2026-07-13
CHH7021 - 2 2026-07-12
CHH7751 Hainan Airlines 1 2026-04-16
CHH7749 - 1 2026-06-23
CHH7743 Hainan Airlines 1 2026-04-18
CHH7668 Hainan Airlines 1 2026-04-28
CHH7563 Hainan Airlines 1 2026-06-27
CHH7562 Hainan Airlines 1 2026-06-22
CHH7388 Hainan Airlines 1 2026-06-21
CHH7316 - 1 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CHH7045 - Jul 17, 05:35 UTCJul 17, 05:45 UTC10m
2026-07-17 CHH7004 - Jul 17, 00:40 UTCJul 17, 00:50 UTC10m
2026-07-15 CHH7045 - Jul 15, 09:30 UTCJul 15, 09:40 UTC10m
2026-07-14 CHH7076 - Jul 14, 03:45 UTCJul 14, 04:20 UTC35m
2026-07-14 CHH7075 - Jul 14, 00:15 UTCJul 14, 00:35 UTC20m
2026-07-13 CHH7022 - Jul 13, 01:01 UTCJul 13, 01:10 UTC10m
2026-07-12 CHH7021 - Jul 12, 23:10 UTCJul 12, 23:25 UTC15m
2026-07-12 CHH7022 - Jul 12, 01:05 UTCJul 12, 01:20 UTC15m
2026-07-11 CHH7021 - Jul 11, 23:10 UTCJul 11, 23:30 UTC20m
2026-07-11 CHH7045 - Jul 11, 05:35 UTCJul 11, 05:45 UTC10m
2026-07-10 CHH7045 - Jul 10, 05:30 UTCJul 10, 05:40 UTC10m
2026-07-06 CHH7045 - Jul 6, 05:35 UTCJul 6, 05:45 UTC10m
2026-07-03 CHH7370 - Jul 3, 00:20 UTCJul 3, 03:55 UTC3h 35m
2026-07-01 CHH7026 - Jul 1, 13:35 UTCJul 1, 13:45 UTC10m
2026-06-30 CHH7765 - Jun 30, 23:15 UTCJun 30, 23:25 UTC10m
2026-06-30 CHH7027 - Jun 30, 14:35 UTCJun 30, 14:50 UTC15m
2026-06-29 CHH7026 - Jun 29, 14:54 UTCJun 29, 15:09 UTC15m
2026-06-28 CHH7765 - Jun 28, 23:04 UTCJun 28, 23:14 UTC10m
2026-06-28 CHH7744 - Jun 28, 04:20 UTCJun 28, 12:50 UTC8h 30m
2026-06-27 CHH7563 SYX → CGO Jun 27, 06:44 UTCJun 27, 13:04 UTC6h 20m
2026-06-27 CHH7316 - Jun 27, 00:25 UTCJun 27, 04:34 UTC4h 10m
2026-06-26 CHH6034 - Jun 26, 14:39 UTCJun 26, 14:55 UTC15m
2026-06-26 CHH6033 - Jun 26, 11:05 UTCJun 26, 11:14 UTC10m
2026-06-26 CHH6031 SYX → ZUH Jun 26, 08:00 UTCJun 26, 08:15 UTC15m
2026-06-25 CHH7312 - Jun 25, 12:44 UTCJun 26, 05:55 UTC17h 10m
2026-06-24 CHH7744 - Jun 24, 12:34 UTCJun 24, 12:54 UTC20m
2026-06-23 CHH7749 - Jun 23, 16:54 UTCJun 23, 17:09 UTC15m
2026-06-23 CHH7312 - Jun 23, 01:30 UTCJun 23, 13:05 UTC11h 35m
2026-06-22 CHH7562 CGO → SYX Jun 22, 02:25 UTCJun 22, 15:05 UTC12h 40m
2026-06-21 CHH7388 KHN → SYX Jun 21, 15:05 UTCJun 22, 02:34 UTC11h 30m
2026-06-20 CHH7312 - Jun 20, 01:34 UTCJun 20, 13:44 UTC12h 10m
2026-06-19 CHH7374 HFE → SYX Jun 19, 13:54 UTCJun 20, 01:39 UTC11h 45m
2026-06-18 CHH7374 HFE → SYX Jun 18, 02:25 UTCJun 18, 14:20 UTC11h 55m
2026-06-17 CHH7374 HFE → SYX Jun 17, 13:40 UTCJun 18, 02:25 UTC12h 45m
2026-06-17 CHH7374 HFE → SYX Jun 17, 02:20 UTCJun 17, 14:15 UTC11h 55m
2026-06-14 CHH7750 SZX → SYX Jun 14, 15:25 UTCJun 14, 15:40 UTC15m
2026-06-14 CHH7744 - Jun 14, 13:00 UTCJun 14, 13:15 UTC15m
2026-06-14 CHH7744 - Jun 14, 12:15 UTCJun 14, 12:30 UTC15m
2026-05-23 CHH7045 ZUH → TYN May 23, 05:40 UTCMay 23, 05:50 UTC10m
2026-05-22 CHH7045 ZUH → TYN May 22, 05:15 UTCMay 22, 05:30 UTC15m
2026-05-21 CHH7075 HAK → KHN May 21, 00:45 UTCMay 21, 04:00 UTC3h 15m
2026-05-17 CHH7045 ZUH → TYN May 17, 05:20 UTCMay 17, 05:30 UTC10m
2026-05-16 CHH7045 ZUH → TYN May 16, 06:25 UTCMay 16, 06:35 UTC10m
2026-05-15 CHH7045 ZUH → TYN May 15, 09:10 UTCMay 15, 09:20 UTC10m
2026-05-06 CHH7045 ZUH → TYN May 6, 05:10 UTCMay 6, 05:20 UTC10m
2026-05-05 CHH7075 HAK → KHN May 5, 00:40 UTCMay 5, 04:15 UTC3h 35m
2026-05-04 CHH7045 ZUH → TYN May 4, 05:20 UTCMay 4, 05:30 UTC10m
2026-05-04 CHH7218 CSX → HAK May 4, 00:50 UTCMay 4, 01:10 UTC20m
2026-04-28 CHH7668 NGB → SZX Apr 28, 04:50 UTCApr 28, 09:30 UTC4h 40m
2026-04-27 CHH7750 SZX → SYX Apr 27, 15:25 UTCApr 27, 15:40 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-20E5 page for operator, model, and routing details .

Mode-S 781871 frequently asked

What is Mode-S code 781871?
781871 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20E5.
Where is Mode-S 781871 registered?
Mode-S code 781871 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781871 broadcasting right now?
No active broadcast right now. Last signal was 18h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781871, octal 36014161, decimal 7,870,577.
What flights does 781871 operate?
Mode-S 781871 has broadcast 20 distinct callsigns, including CHH7045, CHH7744, CHH7374, CHH7765, CHH7750.