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 5d ago
Flights observed
68
Distinct callsigns
11
Country
CN
Last broadcast
5d 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 11 distinct

Callsign Airline Flights Last seen
CHH423 Hainan Airlines 22 2026-05-25
CHH7048 - 19 2026-05-10
CHH7047 - 8 2026-05-09
CHH424 Hainan Airlines 6 2026-05-25
CHH7061 Hainan Airlines 5 2026-04-25
CHH7334 - 2 2026-04-14
CHH7022 Hainan Airlines 2 2026-05-07
CHH7749 - 1 2026-04-15
CHH7333 Hainan Airlines 1 2026-04-13
CHH7311 Hainan Airlines 1 2026-04-15
CHH7062 - 1 2026-04-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-25 CHH424 BKK → CKG May 25, 04:25 UTCMay 25, 05:20 UTC55m
2026-05-25 CHH423 CKG → BKK May 25, 01:55 UTCMay 25, 02:55 UTC1h 0m
2026-05-24 CHH423 CKG → BKK May 24, 04:35 UTCMay 25, 02:55 UTC22h 20m
2026-05-24 CHH423 CKG → BKK May 24, 01:55 UTCMay 24, 02:50 UTC55m
2026-05-23 CHH424 BKK → CKG May 23, 04:25 UTCMay 24, 02:50 UTC22h 25m
2026-05-23 CHH423 CKG → BKK May 23, 01:55 UTCMay 23, 03:00 UTC1h 4m
2026-05-22 CHH423 CKG → BKK May 22, 04:40 UTCMay 23, 03:00 UTC22h 19m
2026-05-22 CHH423 CKG → BKK May 22, 01:50 UTCMay 22, 02:55 UTC1h 5m
2026-05-21 CHH423 CKG → BKK May 21, 04:30 UTCMay 22, 02:55 UTC22h 25m
2026-05-21 CHH423 CKG → BKK May 21, 02:05 UTCMay 21, 03:05 UTC1h 0m
2026-05-20 CHH424 BKK → CKG May 20, 04:30 UTCMay 21, 02:05 UTC21h 36m
2026-05-20 CHH423 CKG → BKK May 20, 02:40 UTCMay 20, 03:10 UTC30m
2026-05-19 CHH424 BKK → CKG May 19, 05:00 UTCMay 20, 03:10 UTC22h 10m
2026-05-19 CHH423 CKG → BKK May 19, 03:00 UTCMay 19, 03:40 UTC40m
2026-05-18 CHH423 CKG → BKK May 18, 04:30 UTCMay 19, 03:40 UTC23h 9m
2026-05-18 CHH423 CKG → BKK May 18, 02:30 UTCMay 18, 03:05 UTC35m
2026-05-17 CHH423 CKG → BKK May 17, 04:35 UTCMay 18, 03:05 UTC22h 30m
2026-05-17 CHH423 CKG → BKK May 17, 02:25 UTCMay 17, 03:00 UTC35m
2026-05-16 CHH424 BKK → CKG May 16, 04:35 UTCMay 17, 03:00 UTC22h 25m
2026-05-16 CHH423 CKG → BKK May 16, 02:00 UTCMay 16, 03:00 UTC1h 0m
2026-05-15 CHH424 BKK → CKG May 15, 04:45 UTCMay 16, 03:00 UTC22h 15m
2026-05-15 CHH423 CKG → BKK May 15, 02:05 UTCMay 15, 03:10 UTC1h 5m
2026-05-14 CHH423 CKG → BKK May 14, 04:30 UTCMay 15, 03:10 UTC22h 40m
2026-05-14 CHH423 CKG → BKK May 14, 02:00 UTCMay 14, 03:00 UTC1h 0m
2026-05-13 CHH423 CKG → BKK May 13, 04:40 UTCMay 14, 03:00 UTC22h 20m
2026-05-13 CHH423 CKG → BKK May 13, 02:05 UTCMay 13, 03:05 UTC1h 0m
2026-05-12 CHH423 CKG → BKK May 12, 04:30 UTCMay 13, 03:05 UTC22h 35m
2026-05-12 CHH423 CKG → BKK May 12, 02:45 UTCMay 12, 03:20 UTC35m
2026-05-10 CHH7048 - May 10, 02:50 UTCMay 10, 12:54 UTC10h 5m
2026-05-09 CHH7048 - May 9, 12:30 UTCMay 10, 00:20 UTC11h 50m
2026-05-09 CHH7047 - May 9, 03:10 UTCMay 9, 03:30 UTC20m
2026-05-08 CHH7048 - May 8, 12:44 UTCMay 9, 00:15 UTC11h 30m
2026-05-08 CHH7047 - May 8, 00:09 UTCMay 8, 08:09 UTC8h 0m
2026-05-07 CHH7022 CAN → SYX May 7, 01:00 UTCMay 7, 01:10 UTC10m
2026-05-06 CHH7048 - May 6, 12:35 UTCMay 6, 12:50 UTC15m
2026-05-05 CHH7048 - May 5, 08:05 UTCMay 6, 00:15 UTC16h 10m
2026-05-05 CHH7048 - May 5, 00:00 UTCMay 5, 13:05 UTC13h 5m
2026-05-04 CHH7048 - May 4, 12:50 UTCMay 5, 08:05 UTC19h 16m
2026-05-04 CHH7048 - May 4, 08:05 UTCMay 5, 00:15 UTC16h 11m
2026-05-03 CHH7048 - May 3, 23:30 UTCMay 4, 13:15 UTC13h 45m
2026-05-03 CHH7048 - May 3, 12:30 UTCMay 4, 08:05 UTC19h 35m
2026-05-03 CHH7048 - May 3, 08:20 UTCMay 4, 08:05 UTC23h 45m
2026-05-03 CHH7048 - May 3, 07:50 UTCMay 3, 23:50 UTC16h 0m
2026-05-03 CHH7047 - May 3, 03:05 UTCMay 3, 23:50 UTC20h 44m
2026-05-02 CHH7048 - May 2, 08:00 UTCMay 3, 00:15 UTC16h 15m
2026-05-02 CHH7048 - May 2, 03:05 UTCMay 3, 00:15 UTC21h 10m
2026-05-01 CHH7048 - May 1, 23:50 UTCMay 2, 12:55 UTC13h 5m
2026-05-01 CHH7047 - May 1, 06:35 UTCMay 2, 03:05 UTC20h 30m
2026-05-01 CHH7047 - May 1, 01:45 UTCMay 2, 00:10 UTC22h 25m
2026-04-30 CHH7048 - Apr 30, 12:40 UTCApr 30, 13:05 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-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 5d 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 11 distinct callsigns, including CHH423, CHH7048, CHH7047, CHH424, CHH7061.