Apparatus

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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 1d ago
Flights observed
100
Distinct callsigns
20
Country
CN
Last broadcast
1d 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

Callsign Airline Flights Last seen
CHH7322 - 5 2026-07-09
CHH7320 Hainan Airlines 5 2026-04-21
CHH7054 - 4 2026-06-15
CHH7775 - 3 2026-06-24
CHH7987 Hainan Airlines 2 2026-06-08
CHH7776 Hainan Airlines 2 2026-06-22
CHH7759 - 2 2026-06-23
CHH7741 - 2 2026-07-11
CHH7654 - 2 2026-07-12
CHH7547 Hainan Airlines 2 2026-06-08
CHH747 - 2 2026-06-28
CHH7468 - 2 2026-06-18
CHH720 Hainan Airlines 2 2026-06-11
CHH719 Hainan Airlines 2 2026-06-11
CHH7137 Hainan Airlines 2 2026-05-27
CHH7078 Hainan Airlines 2 2026-05-16
CHH7988 Hainan Airlines 1 2026-06-08
CHH7982 Hainan Airlines 1 2026-06-02
CHH7981 Hainan Airlines 1 2026-06-02
CHH784 Hainan Airlines 1 2026-06-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 CHH7654 - Jul 12, 14:50 UTCJul 12, 15:30 UTC40m
2026-07-12 CHH7653 - Jul 12, 12:15 UTCJul 12, 12:25 UTC10m
2026-07-11 CHH7741 - Jul 11, 04:01 UTCJul 11, 04:10 UTC10m
2026-07-09 CHH7322 - Jul 9, 23:50 UTCJul 10, 04:40 UTC4h 50m
2026-07-09 CHH7322 - Jul 9, 04:35 UTCJul 10, 01:00 UTC20h 25m
2026-07-09 CHH7322 - Jul 9, 00:20 UTCJul 10, 00:15 UTC23h 55m
2026-07-08 CHH7322 - Jul 8, 23:50 UTCJul 9, 05:50 UTC6h 0m
2026-07-05 CHH7512 - Jul 5, 03:55 UTCJul 5, 04:10 UTC15m
2026-07-03 CHH7322 - Jul 3, 01:25 UTCJul 3, 04:50 UTC3h 25m
2026-07-02 CHH7321 - Jul 2, 04:45 UTCJul 3, 01:30 UTC20h 45m
2026-07-01 CHH7354 - Jul 1, 15:15 UTCJul 2, 04:55 UTC13h 40m
2026-07-01 CHH7163 - Jul 1, 08:10 UTCJul 1, 08:20 UTC10m
2026-06-29 CHH7045 - Jun 29, 05:24 UTCJun 29, 05:34 UTC10m
2026-06-28 CHH780 HKG → HAK Jun 28, 13:10 UTCJun 28, 13:19 UTC10m
2026-06-28 CHH779 - Jun 28, 11:00 UTCJun 28, 11:09 UTC10m
2026-06-28 CHH748 - Jun 28, 04:05 UTCJun 28, 04:29 UTC25m
2026-06-28 CHH747 - Jun 28, 02:25 UTCJun 28, 02:44 UTC20m
2026-06-27 CHH7272 - Jun 27, 14:35 UTCJun 27, 14:49 UTC15m
2026-06-27 - - Jun 27, 04:39 UTCJun 27, 04:54 UTC15m
2026-06-27 CHH7022 CAN → SYX Jun 27, 01:09 UTCJun 27, 01:19 UTC10m
2026-06-25 CHH7731 - Jun 25, 23:59 UTCJun 26, 00:10 UTC10m
2026-06-25 CHH7722 - Jun 25, 09:29 UTCJun 25, 09:40 UTC10m
2026-06-25 CHH7721 - Jun 25, 02:30 UTCJun 25, 02:39 UTC10m
2026-06-24 CHH7775 - Jun 24, 05:40 UTCJun 24, 05:49 UTC10m
2026-06-23 CHH7759 - Jun 23, 08:54 UTCJun 23, 13:29 UTC4h 35m
2026-06-23 CHH7759 - Jun 23, 06:34 UTCJun 23, 06:44 UTC10m
2026-06-23 CHH7740 - Jun 23, 04:55 UTCJun 23, 05:04 UTC10m
2026-06-22 CHH7776 TYN → SZX Jun 22, 16:45 UTCJun 22, 17:10 UTC25m
2026-06-22 CHH7775 - Jun 22, 05:40 UTCJun 22, 05:49 UTC10m
2026-06-21 CHH7776 TYN → SZX Jun 21, 17:54 UTCJun 21, 18:04 UTC10m
2026-06-21 CHH7775 - Jun 21, 07:04 UTCJun 21, 07:20 UTC15m
2026-06-21 CHH7752 - Jun 21, 04:49 UTCJun 21, 05:00 UTC10m
2026-06-20 CHH7751 SZX → CTU Jun 20, 23:10 UTCJun 20, 23:19 UTC10m
2026-06-20 CHH7276 TFU → SZX Jun 20, 12:30 UTCJun 20, 12:39 UTC10m
2026-06-20 CHH7275 - Jun 20, 06:24 UTCJun 20, 06:35 UTC10m
2026-06-19 CHH7735 - Jun 19, 22:24 UTCJun 19, 22:34 UTC10m
2026-06-19 CHH7746 - Jun 19, 17:04 UTCJun 19, 17:14 UTC10m
2026-06-18 CHH7468 - Jun 18, 09:20 UTCJun 18, 09:35 UTC15m
2026-06-18 CHH7467 - Jun 18, 07:30 UTCJun 18, 07:40 UTC10m
2026-06-17 CHH7468 - Jun 17, 09:05 UTCJun 17, 09:15 UTC10m
2026-06-16 CHH7053 HAK → HGH Jun 16, 03:30 UTCJun 16, 06:40 UTC3h 10m
2026-06-15 CHH7054 - Jun 15, 07:00 UTCJun 16, 06:15 UTC23h 15m
2026-06-15 CHH7054 - Jun 15, 02:55 UTCJun 15, 07:00 UTC4h 5m
2026-06-14 CHH7054 - Jun 14, 06:25 UTCJun 15, 03:10 UTC20h 45m
2026-06-14 CHH7054 - Jun 14, 02:30 UTCJun 14, 06:25 UTC3h 55m
2026-06-12 CHH722 BKK → HAK Jun 12, 12:25 UTCJun 12, 13:50 UTC1h 25m
2026-06-12 CHH721 HAK → BKK Jun 12, 04:30 UTCJun 12, 11:15 UTC6h 45m
2026-06-12 CHH747 - Jun 12, 02:00 UTCJun 12, 02:35 UTC35m
2026-06-11 CHH784 HAN → HAK Jun 11, 14:15 UTCJun 11, 14:50 UTC35m
2026-06-11 CHH783 HAK → HAN Jun 11, 11:45 UTCJun 11, 12:20 UTC35m

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 1d 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 CHH7322, CHH7320, CHH7054, CHH7775, CHH7987.