Apparatus

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sensors Mode-S transponder

780DD2

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-1799 · BOEING 737-800

Hex
780DD2
Octal
36006722
Decimal
7,867,858
Country
CN
Tail
B-1799
Type
B738
No current signal · last broadcast Jul 24, 02:40 UTC
Flights observed
155
Distinct callsigns
20
Country
CN
Last broadcast
Jul 24, 02:40 UTC

Last known position

Most recent position reported by Mode-S 780DD2.

Country allocation

The ICAO 24-bit address 780DD2 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
CHH7322 Hainan Airlines 6 2026-04-30
CHH720 - 5 2026-07-06
CHH719 - 5 2026-07-06
CHH7760 Hainan Airlines 4 2026-06-17
CHH706 - 4 2026-07-06
CHH705 - 4 2026-07-06
CHH7809 Hainan Airlines 3 2026-07-23
CHH7774 Hainan Airlines 3 2026-06-18
CHH7759 - 3 2026-06-17
CHH7731 - 3 2026-06-18
CHH7157 Hainan Airlines 3 2026-06-11
CHH7811 - 2 2026-07-08
CHH7773 Hainan Airlines 2 2026-06-18
CHH7752 - 2 2026-06-17
CHH7749 - 2 2026-07-16
CHH7748 Hainan Airlines 2 2026-05-31
CHH7747 Hainan Airlines 2 2026-05-31
CHH7741 - 2 2026-06-27
CHH7736 - 2 2026-07-17
CHH7730 Hainan Airlines 2 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 CHH6383 PEK → XIY Jul 24, 02:25 UTCJul 24, 02:40 UTC15m
2026-07-23 CHH7809 PEK → CAN Jul 23, 07:05 UTCJul 23, 07:25 UTC20m
2026-07-21 CHH7105 - Jul 21, 23:05 UTCJul 21, 23:15 UTC10m
2026-07-21 CHH7809 PEK → CAN Jul 21, 06:50 UTCJul 21, 07:10 UTC20m
2026-07-20 CHH7185 PEK → YIH Jul 20, 23:20 UTCJul 20, 23:40 UTC20m
2026-07-20 CHH7238 XIY → PEK Jul 20, 09:05 UTCJul 20, 09:40 UTC35m
2026-07-20 CHH7237 PEK → XIY Jul 20, 04:05 UTCJul 20, 04:25 UTC20m
2026-07-19 CHH7488 CGQ → HGH Jul 19, 13:00 UTCJul 19, 13:50 UTC50m
2026-07-19 CHH7261 CAN → HGH Jul 19, 04:50 UTCJul 19, 05:00 UTC10m
2026-07-18 CHH7177 - Jul 18, 13:30 UTCJul 18, 13:40 UTC10m
2026-07-17 CHH7557 - Jul 17, 14:30 UTCJul 17, 14:39 UTC10m
2026-07-17 CHH7275 - Jul 17, 06:35 UTCJul 17, 06:45 UTC10m
2026-07-17 CHH7736 - Jul 17, 05:10 UTCJul 17, 05:20 UTC10m
2026-07-16 CHH7735 - Jul 16, 22:30 UTCJul 16, 22:40 UTC10m
2026-07-16 CHH7749 - Jul 16, 16:19 UTCJul 16, 16:30 UTC10m
2026-07-15 CHH7135 - Jul 15, 23:25 UTCJul 15, 23:45 UTC20m
2026-07-14 CHH7235 - Jul 14, 03:15 UTCJul 14, 03:35 UTC20m
2026-07-13 CHH7477 - Jul 13, 04:20 UTCJul 13, 04:30 UTC10m
2026-07-12 CHH7015 - Jul 12, 11:35 UTCJul 12, 11:50 UTC15m
2026-07-12 CHH7016 - Jul 12, 08:30 UTCJul 12, 08:50 UTC20m
2026-07-11 CHH7054 - Jul 11, 03:05 UTCJul 11, 06:15 UTC3h 10m
2026-07-10 CHH7177 - Jul 10, 14:25 UTCJul 10, 14:35 UTC10m
2026-07-10 CHH7053 - Jul 10, 05:45 UTCJul 10, 05:55 UTC10m
2026-07-09 CHH7801 - Jul 9, 00:45 UTCJul 9, 01:05 UTC20m
2026-07-08 CHH7811 - Jul 8, 09:25 UTCJul 8, 09:40 UTC15m
2026-07-08 CHH7883 - Jul 8, 00:05 UTCJul 8, 00:20 UTC15m
2026-07-07 CHH7714 - Jul 7, 16:55 UTCJul 7, 17:05 UTC10m
2026-07-07 CHH7722 - Jul 7, 10:20 UTCJul 7, 10:35 UTC15m
2026-07-07 CHH7722 - Jul 7, 08:35 UTCJul 7, 09:25 UTC50m
2026-07-07 CHH7721 - Jul 7, 02:30 UTCJul 7, 02:40 UTC10m
2026-07-07 CHH7023 - Jul 7, 00:00 UTCJul 7, 00:10 UTC10m
2026-07-06 CHH7654 - Jul 6, 15:00 UTCJul 6, 15:40 UTC40m
2026-07-06 CHH7653 - Jul 6, 12:15 UTCJul 6, 12:30 UTC15m
2026-07-06 CHH720 - Jul 6, 08:40 UTCJul 6, 08:55 UTC15m
2026-07-06 CHH719 - Jul 6, 06:10 UTCJul 6, 06:30 UTC20m
2026-07-06 CHH706 - Jul 6, 02:20 UTCJul 6, 02:35 UTC15m
2026-07-06 CHH705 - Jul 6, 00:30 UTCJul 6, 00:45 UTC15m
2026-07-05 CHH7654 - Jul 5, 02:25 UTCJul 5, 15:40 UTC13h 15m
2026-07-01 CHH7137 - Jul 1, 23:05 UTCJul 1, 23:20 UTC15m
2026-07-01 CHH7809 - Jul 1, 06:45 UTCJul 1, 07:05 UTC20m
2026-06-29 CHH7668 NGB → SZX Jun 29, 14:34 UTCJun 30, 09:15 UTC18h 41m
2026-06-29 CHH7374 HFE → SYX Jun 29, 14:19 UTCJun 30, 09:15 UTC18h 56m
2026-06-29 CHH7374 HFE → SYX Jun 29, 02:00 UTCJun 29, 15:00 UTC13h 0m
2026-06-28 CHH7210 - Jun 28, 10:24 UTCJun 29, 02:09 UTC15h 45m
2026-06-28 CHH7209 - Jun 28, 05:49 UTCJun 29, 02:09 UTC20h 20m
2026-06-27 CHH7741 - Jun 27, 06:59 UTCJun 27, 07:10 UTC10m
2026-06-26 CHH7697 - Jun 26, 08:20 UTCJun 26, 09:20 UTC1h 0m
2026-06-25 CHH7741 - Jun 25, 03:40 UTCJun 25, 03:50 UTC10m
2026-06-25 CHH7742 - Jun 25, 01:40 UTCJun 25, 01:50 UTC10m
2026-06-23 CHH461 HAK → VTE Jun 23, 12:49 UTCJun 23, 15:34 UTC2h 45m

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-1799 page for operator, model, and routing details .

Mode-S 780DD2 frequently asked

What is Mode-S code 780DD2?
780DD2 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-1799.
Where is Mode-S 780DD2 registered?
Mode-S code 780DD2 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 780DD2 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 02:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 780DD2, octal 36006722, decimal 7,867,858.
What flights does 780DD2 operate?
Mode-S 780DD2 has broadcast 20 distinct callsigns, including CHH7322, CHH720, CHH719, CHH7760, CHH706.