Apparatus

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sensors Mode-S transponder

7820B9

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-225H · BOEING 737 MAX 8

Hex
7820B9
Octal
36020271
Decimal
7,872,697
Country
CN
Tail
B-225H
Type
B38M
No current signal · last broadcast 4h ago
Flights observed
127
Distinct callsigns
20
Country
CN
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 7820B9.

Country allocation

The ICAO 24-bit address 7820B9 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
CHH423 - 43 2026-07-14
CHH7048 - 20 2026-06-03
CHH424 - 19 2026-07-14
CHH7061 - 11 2026-06-26
CHH7047 - 9 2026-06-03
CHH7022 Hainan Airlines 3 2026-06-16
CHH7418 Hainan Airlines 2 2026-06-13
CHH7334 - 2 2026-04-14
CHH7075 - 2 2026-06-28
CHH6394 - 2 2026-07-10
CHH7749 - 1 2026-04-15
CHH7688 - 1 2026-06-28
CHH7372 Hainan Airlines 1 2026-07-01
CHH7350 Hainan Airlines 1 2026-06-12
CHH7333 Hainan Airlines 1 2026-04-13
CHH7311 Hainan Airlines 1 2026-04-15
CHH7218 Hainan Airlines 1 2026-06-15
CHH7171 - 1 2026-07-02
CHH7094 - 1 2026-06-28
CHH7093 Hainan Airlines 1 2026-06-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CHH424 - Jul 14, 04:35 UTCJul 14, 05:55 UTC1h 20m
2026-07-14 CHH423 - Jul 14, 02:40 UTCJul 14, 03:10 UTC30m
2026-07-14 CHH423 - Jul 14, 01:35 UTCJul 14, 01:50 UTC15m
2026-07-13 CHH424 - Jul 13, 04:35 UTCJul 14, 01:50 UTC21h 15m
2026-07-13 CHH423 - Jul 13, 02:45 UTCJul 13, 03:05 UTC20m
2026-07-13 CHH423 - Jul 13, 01:35 UTCJul 13, 01:50 UTC15m
2026-07-12 CHH424 - Jul 12, 04:25 UTCJul 12, 04:40 UTC15m
2026-07-12 CHH423 - Jul 12, 02:40 UTCJul 12, 03:05 UTC25m
2026-07-12 CHH423 - Jul 12, 01:40 UTCJul 12, 01:50 UTC10m
2026-07-11 CHH424 - Jul 11, 05:35 UTCJul 12, 01:50 UTC20h 15m
2026-07-11 CHH424 - Jul 11, 04:25 UTCJul 11, 04:40 UTC15m
2026-07-11 CHH423 - Jul 11, 01:10 UTCJul 11, 02:30 UTC1h 20m
2026-07-10 CHH6394 - Jul 10, 14:30 UTCJul 10, 14:45 UTC15m
2026-07-08 CHH424 - Jul 8, 04:30 UTCJul 8, 13:50 UTC9h 20m
2026-07-07 CHH423 - Jul 7, 13:15 UTCJul 8, 02:55 UTC13h 40m
2026-07-07 CHH424 - Jul 7, 04:25 UTCJul 7, 11:15 UTC6h 50m
2026-07-06 CHH423 - Jul 6, 13:55 UTCJul 7, 03:05 UTC13h 10m
2026-07-06 CHH423 BKK → BKK Jul 6, 04:30 UTCJul 7, 03:05 UTC22h 35m
2026-07-06 CHH423 - Jul 6, 01:10 UTCJul 6, 02:45 UTC1h 35m
2026-07-05 CHH424 - Jul 5, 04:35 UTCJul 5, 11:40 UTC7h 5m
2026-07-04 CHH423 - Jul 4, 10:45 UTCJul 5, 02:55 UTC16h 10m
2026-07-04 CHH424 - Jul 4, 04:40 UTCJul 5, 02:55 UTC22h 15m
2026-07-04 CHH423 - Jul 4, 01:45 UTCJul 4, 03:15 UTC1h 30m
2026-07-03 CHH424 - Jul 3, 04:50 UTCJul 4, 03:15 UTC22h 25m
2026-07-03 CHH423 - Jul 3, 02:20 UTCJul 3, 02:55 UTC35m
2026-07-02 CHH6394 - Jul 2, 15:15 UTCJul 2, 15:25 UTC10m
2026-07-02 CHH6393 - Jul 2, 13:40 UTCJul 2, 13:50 UTC10m
2026-07-02 CHH7171 - Jul 2, 00:50 UTCJul 2, 01:00 UTC10m
2026-07-01 CHH7372 CKG → HAK Jul 1, 11:35 UTCJul 1, 11:45 UTC10m
2026-06-28 CHH7688 - Jun 28, 23:25 UTCJun 29, 11:14 UTC11h 50m
2026-06-28 CHH7094 - Jun 28, 10:19 UTCJun 28, 10:50 UTC30m
2026-06-28 CHH7093 HAK → KMG Jun 28, 06:34 UTCJun 28, 06:44 UTC10m
2026-06-28 CHH7075 - Jun 28, 00:30 UTCJun 28, 04:05 UTC3h 35m
2026-06-27 CHH7075 - Jun 27, 06:25 UTCJun 28, 04:05 UTC21h 40m
2026-06-26 CHH7061 - Jun 26, 16:05 UTCJun 27, 06:35 UTC14h 30m
2026-06-25 CHH7061 - Jun 25, 01:59 UTCJun 25, 14:34 UTC12h 35m
2026-06-24 CHH7092 KMG → HAK Jun 24, 01:44 UTCJun 24, 05:34 UTC3h 50m
2026-06-23 CHH7061 - Jun 23, 05:54 UTCJun 23, 14:44 UTC8h 50m
2026-06-22 CHH7061 - Jun 22, 06:00 UTCJun 22, 06:10 UTC10m
2026-06-21 CHH7061 - Jun 21, 05:59 UTCJun 21, 06:14 UTC15m
2026-06-20 CHH7061 - Jun 20, 06:05 UTCJun 20, 06:14 UTC10m
2026-06-16 CHH7022 CAN → SYX Jun 16, 02:20 UTCJun 16, 02:34 UTC15m
2026-06-15 CHH7046 TYN → HAK Jun 15, 15:30 UTCJun 15, 15:45 UTC15m
2026-06-15 CHH7218 CSX → HAK Jun 15, 01:20 UTCJun 15, 01:30 UTC10m
2026-06-13 CHH7418 CSX → HAK Jun 13, 14:15 UTCJun 14, 06:50 UTC16h 35m
2026-06-13 CHH7418 CSX → HAK Jun 13, 01:10 UTCJun 13, 14:20 UTC13h 9m
2026-06-12 CHH7350 CKG → SYX Jun 12, 10:45 UTCJun 13, 01:10 UTC14h 25m
2026-06-12 CHH424 BKK → CKG Jun 12, 04:25 UTCJun 12, 04:45 UTC20m
2026-06-11 CHH423 CKG → BKK Jun 11, 10:50 UTCJun 12, 02:55 UTC16h 6m
2026-06-11 CHH423 CKG → BKK Jun 11, 04:40 UTCJun 12, 02:55 UTC22h 15m

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-225H page for operator, model, and routing details .

Mode-S 7820B9 frequently asked

What is Mode-S code 7820B9?
7820B9 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-225H.
Where is Mode-S 7820B9 registered?
Mode-S code 7820B9 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7820B9 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7820B9, octal 36020271, decimal 7,872,697.
What flights does 7820B9 operate?
Mode-S 7820B9 has broadcast 20 distinct callsigns, including CHH423, CHH7048, CHH424, CHH7061, CHH7047.