Apparatus

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sensors Mode-S transponder

78129D

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-1346 · BOEING 737-800

Hex
78129D
Octal
36011235
Decimal
7,869,085
Country
CN
Tail
B-1346
Type
B738
No current signal · last broadcast 1d ago
Flights observed
133
Distinct callsigns
20
Country
CN
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 78129D.

Country allocation

The ICAO 24-bit address 78129D 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
CHH7384 - 4 2026-06-28
CHH7319 - 4 2026-07-16
CHH439 - 4 2026-06-13
CHH7987 Hainan Airlines 3 2026-06-09
CHH7698 Hainan Airlines 3 2026-05-30
CHH7390 - 3 2026-06-28
CHH7334 Hainan Airlines 3 2026-04-30
CHH7320 - 3 2026-07-16
CHH7306 - 3 2026-06-29
CHH720 - 3 2026-07-17
CHH719 - 3 2026-07-17
CHH7115 - 3 2026-07-10
CHH7996 Hainan Airlines 2 2026-06-10
CHH7988 Hainan Airlines 2 2026-06-10
CHH7777 Hainan Airlines 2 2026-06-12
CHH7750 - 2 2026-06-22
CHH7741 Hainan Airlines 2 2026-05-27
CHH7730 Hainan Airlines 2 2026-05-26
CHH7668 Hainan Airlines 2 2026-05-02
CHH7654 - 2 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CHH720 - Jul 17, 08:40 UTCJul 17, 08:49 UTC10m
2026-07-17 CHH719 - Jul 17, 06:20 UTCJul 17, 06:35 UTC15m
2026-07-16 CHH7320 - Jul 16, 12:49 UTCJul 17, 02:34 UTC13h 45m
2026-07-16 CHH7319 - Jul 16, 02:25 UTCJul 16, 12:55 UTC10h 30m
2026-07-15 CHH7319 - Jul 15, 13:20 UTCJul 16, 12:55 UTC23h 35m
2026-07-15 CHH7319 - Jul 15, 10:00 UTCJul 16, 02:25 UTC16h 25m
2026-07-14 CHH7687 - Jul 14, 00:50 UTCJul 14, 10:05 UTC9h 15m
2026-07-13 CHH7654 - Jul 13, 14:40 UTCJul 13, 15:35 UTC55m
2026-07-13 CHH7653 - Jul 13, 05:10 UTCJul 13, 12:40 UTC7h 30m
2026-07-10 CHH7654 - Jul 10, 15:00 UTCJul 10, 15:40 UTC40m
2026-07-10 CHH7115 - Jul 10, 03:05 UTCJul 10, 13:00 UTC9h 55m
2026-07-09 CHH7115 - Jul 9, 11:20 UTCJul 10, 08:10 UTC20h 50m
2026-07-09 CHH7115 - Jul 9, 11:10 UTCJul 10, 08:10 UTC21h 0m
2026-07-09 CHH7120 - Jul 9, 05:10 UTCJul 10, 03:15 UTC22h 5m
2026-07-08 CHH7247 - Jul 8, 05:20 UTCJul 8, 05:40 UTC20m
2026-07-07 CHH7247 - Jul 7, 05:05 UTCJul 7, 05:25 UTC20m
2026-07-06 CHH7054 - Jul 6, 02:55 UTCJul 6, 12:30 UTC9h 35m
2026-07-05 CHH7468 - Jul 5, 09:20 UTCJul 5, 09:35 UTC15m
2026-07-05 CHH7467 - Jul 5, 07:55 UTCJul 5, 08:05 UTC10m
2026-07-04 CHH7488 - Jul 4, 12:55 UTCJul 4, 13:05 UTC10m
2026-07-03 CHH7468 - Jul 3, 09:40 UTCJul 3, 09:50 UTC10m
2026-07-02 CHH7488 - Jul 2, 12:40 UTCJul 2, 13:25 UTC45m
2026-06-29 CHH7327 - Jun 29, 09:54 UTCJun 30, 04:40 UTC18h 46m
2026-06-29 CHH7306 - Jun 29, 06:59 UTCJun 30, 04:40 UTC21h 41m
2026-06-29 CHH7305 - Jun 29, 01:00 UTCJun 29, 15:54 UTC14h 55m
2026-06-28 CHH7384 - Jun 28, 16:00 UTCJun 29, 10:10 UTC18h 10m
2026-06-28 CHH7384 - Jun 28, 11:39 UTCJun 29, 10:10 UTC22h 30m
2026-06-28 CHH7383 - Jun 28, 10:50 UTCJun 29, 07:15 UTC20h 25m
2026-06-28 CHH7390 - Jun 28, 00:50 UTCJun 28, 07:44 UTC6h 55m
2026-06-27 CHH7390 - Jun 27, 09:40 UTCJun 28, 07:44 UTC22h 5m
2026-06-27 CHH7209 - Jun 27, 05:19 UTCJun 28, 00:50 UTC19h 30m
2026-06-26 CHH7328 CTU → SZX Jun 26, 15:34 UTCJun 27, 09:50 UTC18h 15m
2026-06-26 CHH7327 - Jun 26, 09:50 UTCJun 27, 05:29 UTC19h 40m
2026-06-26 CHH7390 HGH → SZX Jun 26, 06:29 UTCJun 27, 05:15 UTC22h 45m
2026-06-25 CHH7388 KHN → SYX Jun 25, 14:50 UTCJun 25, 15:15 UTC25m
2026-06-24 CHH7386 - Jun 24, 05:05 UTCJun 24, 10:35 UTC5h 30m
2026-06-23 CHH7210 - Jun 23, 09:45 UTCJun 24, 05:15 UTC19h 30m
2026-06-23 CHH7209 - Jun 23, 04:29 UTCJun 23, 09:59 UTC5h 30m
2026-06-22 CHH7750 - Jun 22, 15:24 UTCJun 22, 15:35 UTC10m
2026-06-21 CHH7767 - Jun 21, 23:50 UTCJun 22, 00:55 UTC1h 5m
2026-06-21 CHH7734 CGO → SZX Jun 21, 17:50 UTCJun 21, 18:00 UTC10m
2026-06-21 CHH7770 - Jun 21, 10:54 UTCJun 21, 11:10 UTC15m
2026-06-21 CHH7630 - Jun 21, 07:00 UTCJun 21, 07:14 UTC15m
2026-06-17 CHH7638 - Jun 17, 07:25 UTCJun 17, 07:35 UTC10m
2026-06-17 CHH7637 CGO → ZUH Jun 17, 04:30 UTCJun 17, 04:40 UTC10m
2026-06-16 CHH7644 - Jun 16, 09:25 UTCJun 16, 09:40 UTC15m
2026-06-14 CHH7339 SYX → CKG Jun 14, 04:15 UTCJun 14, 04:35 UTC20m
2026-06-13 CHH7340 CKG → SYX Jun 13, 07:20 UTCJun 14, 02:05 UTC18h 45m
2026-06-13 CHH440 NRT → PEK Jun 13, 05:20 UTCJun 14, 02:05 UTC20h 45m
2026-06-13 CHH439 - Jun 13, 00:30 UTCJun 13, 02:35 UTC2h 5m

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-1346 page for operator, model, and routing details .

Mode-S 78129D frequently asked

What is Mode-S code 78129D?
78129D is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-1346.
Where is Mode-S 78129D registered?
Mode-S code 78129D is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 78129D broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 78129D, octal 36011235, decimal 7,869,085.
What flights does 78129D operate?
Mode-S 78129D has broadcast 20 distinct callsigns, including CHH7384, CHH7319, CHH439, CHH7987, CHH7698.