Apparatus

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sensors Mode-S transponder

781579

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-303Z · AIRBUS A-330-300

Hex
781579
Octal
36012571
Decimal
7,869,817
Country
CN
Tail
B-303Z
Type
A333
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
201
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S 781579.

Country allocation

The ICAO 24-bit address 781579 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
CHH752 Hainan Airlines 18 2026-07-25
CHH754 Hainan Airlines 17 2026-07-20
CHH751 Hainan Airlines 15 2026-07-26
CHH753 - 11 2026-07-19
CHH7986 - 9 2026-06-22
CHH7985 - 9 2026-06-21
CHH7966 - 9 2026-07-10
CHH7965 - 8 2026-07-09
CHH7938 - 6 2026-06-19
CHH769 - 6 2026-07-01
CHH7605 Hainan Airlines 6 2026-07-23
CHH7603 - 6 2026-07-21
CHH408 Hainan Airlines 6 2026-06-08
CHH766 - 5 2026-07-18
CHH7937 - 4 2026-06-19
CHH7146 - 4 2026-07-03
CHH407 Hainan Airlines 4 2026-06-07
CHH7801 - 3 2026-07-01
CHH765 - 3 2026-07-14
CHH7279 - 3 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CHH751 PEK → DUB Jul 26, 19:00 UTCJul 26, 22:15 UTC3h 15m
2026-07-26 CHH6213 PEK → KHN Jul 26, 01:10 UTCJul 26, 01:25 UTC15m
2026-07-25 CHH752 DUB → PEK Jul 25, 11:20 UTCJul 25, 20:50 UTC9h 30m
2026-07-24 CHH751 PEK → DUB Jul 24, 19:15 UTCJul 25, 05:50 UTC10h 35m
2026-07-24 CHH7612 PVG → PEK Jul 24, 15:30 UTCJul 24, 15:50 UTC20m
2026-07-24 CHH7607 PEK → SHA Jul 24, 09:35 UTCJul 24, 10:05 UTC30m
2026-07-24 CHH7190 KWE → PEK Jul 24, 00:35 UTCJul 24, 07:45 UTC7h 10m
2026-07-23 CHH7605 PEK → SHA Jul 23, 08:00 UTCJul 23, 08:15 UTC15m
2026-07-23 CHH7277 PEK → HGH Jul 23, 00:20 UTCJul 23, 00:35 UTC15m
2026-07-22 CHH752 DUB → PEK Jul 22, 20:35 UTCJul 22, 20:55 UTC20m
2026-07-22 CHH752 DUB → PEK Jul 22, 11:15 UTCJul 22, 18:10 UTC6h 55m
2026-07-21 CHH751 PEK → DUB Jul 21, 19:00 UTCJul 22, 05:25 UTC10h 25m
2026-07-21 CHH7847 XIY → CAN Jul 21, 08:10 UTCJul 21, 08:30 UTC20m
2026-07-21 CHH7603 - Jul 21, 01:05 UTCJul 21, 01:15 UTC10m
2026-07-20 CHH754 MAN → PEK Jul 20, 20:45 UTCJul 20, 21:00 UTC15m
2026-07-20 CHH754 MAN → PEK Jul 20, 11:35 UTCJul 20, 18:15 UTC6h 40m
2026-07-19 CHH753 - Jul 19, 20:15 UTCJul 20, 06:10 UTC9h 55m
2026-07-19 CHH7714 SZX → PEK Jul 19, 11:35 UTCJul 19, 11:45 UTC10m
2026-07-18 CHH766 - Jul 18, 15:25 UTCJul 18, 15:40 UTC15m
2026-07-15 CHH766 - Jul 15, 15:10 UTCJul 15, 15:30 UTC20m
2026-07-15 CHH766 - Jul 15, 12:15 UTCJul 15, 12:30 UTC15m
2026-07-14 CHH765 - Jul 14, 23:55 UTCJul 15, 03:40 UTC3h 45m
2026-07-14 CHH7010 - Jul 14, 13:15 UTCJul 14, 13:25 UTC10m
2026-07-12 CHH765 - Jul 12, 23:55 UTCJul 13, 15:40 UTC15h 45m
2026-07-12 CHH7182 - Jul 12, 05:25 UTCJul 12, 05:50 UTC25m
2026-07-11 CHH754 - Jul 11, 20:20 UTCJul 11, 20:40 UTC20m
2026-07-11 CHH754 - Jul 11, 11:25 UTCJul 11, 17:50 UTC6h 25m
2026-07-10 CHH753 - Jul 10, 22:45 UTCJul 11, 05:50 UTC7h 5m
2026-07-10 CHH7708 - Jul 10, 08:30 UTCJul 10, 08:45 UTC15m
2026-07-10 CHH7703 - Jul 10, 05:05 UTCJul 10, 05:20 UTC15m
2026-07-10 CHH7703 - Jul 10, 02:35 UTCJul 10, 02:55 UTC20m
2026-07-10 CHH7966 - Jul 10, 00:05 UTCJul 10, 00:25 UTC20m
2026-07-09 CHH7966 - Jul 9, 18:45 UTCJul 9, 21:35 UTC2h 50m
2026-07-09 CHH7966 - Jul 9, 17:25 UTCJul 9, 17:40 UTC15m
2026-07-09 CHH7965 - Jul 9, 07:10 UTCJul 9, 15:20 UTC8h 10m
2026-07-08 CHH7966 - Jul 8, 23:55 UTCJul 9, 00:10 UTC15m
2026-07-08 CHH7966 - Jul 8, 18:30 UTCJul 8, 21:25 UTC2h 55m
2026-07-08 CHH7966 - Jul 8, 17:20 UTCJul 8, 17:40 UTC20m
2026-07-08 CHH7965 - Jul 8, 14:40 UTCJul 8, 14:50 UTC10m
2026-07-08 CHH7965 - Jul 8, 10:15 UTCJul 8, 14:05 UTC3h 50m
2026-07-07 CHH752 - Jul 7, 20:45 UTCJul 7, 21:00 UTC15m
2026-07-07 CHH752 - Jul 7, 11:25 UTCJul 7, 18:15 UTC6h 50m
2026-07-06 CHH751 - Jul 6, 19:10 UTCJul 7, 05:20 UTC10h 10m
2026-07-06 CHH7246 - Jul 6, 14:55 UTCJul 6, 15:20 UTC25m
2026-07-06 CHH7245 - Jul 6, 06:45 UTCJul 6, 07:10 UTC25m
2026-07-05 CHH7577 - Jul 5, 23:25 UTCJul 5, 23:40 UTC15m
2026-07-05 CHH752 - Jul 5, 20:30 UTCJul 5, 20:45 UTC15m
2026-07-05 CHH752 - Jul 5, 11:20 UTCJul 5, 18:00 UTC6h 40m
2026-07-04 CHH751 - Jul 4, 19:10 UTCJul 5, 05:35 UTC10h 25m
2026-07-04 CHH7279 - Jul 4, 07:05 UTCJul 4, 07:30 UTC25m

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-303Z page for operator, model, and routing details .

Mode-S 781579 frequently asked

What is Mode-S code 781579?
781579 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-303Z.
Where is Mode-S 781579 registered?
Mode-S code 781579 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781579 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781579, octal 36012571, decimal 7,869,817.
What flights does 781579 operate?
Mode-S 781579 has broadcast 20 distinct callsigns, including CHH752, CHH754, CHH751, CHH753, CHH7986.