sensors Mode-S transponder

780421

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-5479 · BOEING 737-800

Hex
780421
Octal
36002041
Decimal
7,865,377
Country
CN
Tail
B-5479
Type
B738
No current signal · last broadcast 1h ago
Flights observed
37
Distinct callsigns
20
Country
CN
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 780421.

Country allocation

The ICAO 24-bit address 780421 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

Recent flights last 37

DateFlightRouteTakeoffLandingDuration
2026-05-30 CHH7777 PEK → BAR May 30, 06:05 UTCMay 30, 06:15 UTC10m
2026-05-30 CHH7138 XIY → PEK May 30, 03:55 UTCMay 30, 04:15 UTC20m
2026-05-27 CHH7137 PEK → XIY May 27, 23:00 UTCMay 27, 23:15 UTC15m
2026-05-27 CHH7247 PEK → TFU May 27, 05:09 UTCMay 27, 05:29 UTC20m
2026-05-26 CHH7547 PEK → TFU May 26, 12:10 UTCMay 26, 12:24 UTC15m
2026-05-19 CHH7137 PEK → XIY May 19, 23:20 UTCMay 19, 23:30 UTC10m
2026-05-16 CHH7078 KHN → HAK May 16, 09:45 UTCMay 17, 03:50 UTC18h 5m
2026-05-16 CHH7077 HAK → KHN May 16, 06:31 UTCMay 17, 03:50 UTC21h 19m
2026-05-12 CHH7741 SZX → KWE May 12, 03:55 UTCMay 12, 04:05 UTC10m
2026-05-09 CHH7289 PEK → KWE May 9, 23:35 UTCMay 10, 00:00 UTC25m
2026-05-09 CHH7801 PEK → CAN May 9, 01:00 UTCMay 9, 01:15 UTC15m
2026-05-08 CHH6012 XIY → PEK May 8, 13:50 UTCMay 8, 14:05 UTC15m
2026-05-06 CHH7688 NGB → HAK May 6, 23:45 UTCMay 7, 10:05 UTC10h 20m
2026-05-06 CHH7282 PEK → HAK May 6, 13:10 UTCMay 7, 10:05 UTC20h 55m
2026-05-06 CHH7081 HAK → PEK May 6, 11:10 UTCMay 6, 11:20 UTC10m
2026-05-06 CHH7164 NKG → SZX May 6, 00:01 UTCMay 6, 05:25 UTC5h 25m
2026-05-05 CHH7123 PEK → JXA May 5, 12:05 UTCMay 5, 12:15 UTC10m
2026-05-05 CHH6009 YNT → HAK May 5, 00:30 UTCMay 5, 00:40 UTC10m
2026-05-04 CHH7134 - May 4, 16:20 UTCMay 4, 16:40 UTC20m
2026-05-04 CHH7133 - May 4, 12:20 UTCMay 4, 12:40 UTC20m
2026-05-04 CHH7238 XIY → PEK May 4, 08:10 UTCMay 4, 08:30 UTC20m
2026-05-04 CHH7237 PEK → XIY May 4, 03:35 UTCMay 4, 03:54 UTC20m
2026-05-03 CHH7567 PEK → CKG May 3, 11:10 UTCMay 3, 11:30 UTC20m
2026-04-29 CHH7078 KHN → HAK Apr 29, 00:40 UTCApr 29, 11:45 UTC11h 6m
2026-04-21 CHH7320 PVG → HAK Apr 21, 09:55 UTCApr 22, 02:30 UTC16h 35m
2026-04-21 CHH7687 NGB → TAO Apr 21, 00:00 UTCApr 21, 12:45 UTC12h 45m
2026-04-20 CHH7654 JUH → TYN Apr 20, 02:30 UTCApr 20, 15:50 UTC13h 20m
2026-04-19 CHH7320 PVG → HAK Apr 19, 12:40 UTCApr 20, 12:15 UTC23h 35m
2026-04-19 CHH7320 PVG → HAK Apr 19, 02:15 UTCApr 19, 12:45 UTC10h 30m
2026-04-18 CHH7320 PVG → HAK Apr 18, 12:30 UTCApr 19, 02:30 UTC14h 0m
2026-04-18 CHH7320 PVG → HAK Apr 18, 02:45 UTCApr 18, 03:05 UTC20m
2026-04-17 CHH7216 NKG → HAK Apr 17, 09:55 UTCApr 17, 10:20 UTC25m
2026-04-17 CHH7215 HAK → NKG Apr 17, 05:20 UTCApr 17, 05:30 UTC10m
2026-04-15 CHH7120 PVG → HAK Apr 15, 09:30 UTCApr 15, 10:55 UTC1h 25m
2026-04-15 CHH7119 HAK → PVG Apr 15, 05:05 UTCApr 15, 05:20 UTC15m
2026-04-14 CHH7386 HGH → SYX Apr 14, 09:50 UTCApr 14, 10:10 UTC20m
2026-04-14 CHH7385 SYX → HGH Apr 14, 05:35 UTCApr 14, 05:55 UTC20m

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-5479 page for operator, model, and routing details .

Mode-S 780421 frequently asked

What is Mode-S code 780421?
780421 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-5479.
Where is Mode-S 780421 registered?
Mode-S code 780421 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 780421 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 780421, octal 36002041, decimal 7,865,377.
What flights does 780421 operate?
Mode-S 780421 has broadcast 20 distinct callsigns, including CHH7320, CHH7137, CHH7078, CHH7801, CHH7777.