Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 Jul 26, 11:10 UTC
Flights observed
152
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 11:10 UTC

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 Hainan Airlines 58 2026-07-25
CHH424 Hainan Airlines 28 2026-07-26
CHH7048 - 20 2026-06-03
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
2026-07-26 CHH424 BKK → CKG Jul 26, 04:50 UTCJul 26, 11:10 UTC6h 21m
2026-07-25 CHH423 CKG → BKK Jul 25, 10:50 UTCJul 26, 02:45 UTC15h 55m
2026-07-25 CHH423 CKG → BKK Jul 25, 04:50 UTCJul 26, 02:45 UTC21h 55m
2026-07-25 CHH423 CKG → BKK Jul 25, 02:20 UTCJul 25, 02:50 UTC30m
2026-07-24 CHH424 BKK → CKG Jul 24, 06:20 UTCJul 25, 01:35 UTC19h 15m
2026-07-24 CHH424 BKK → CKG Jul 24, 05:30 UTCJul 25, 01:35 UTC20h 5m
2026-07-23 CHH423 CKG → BKK Jul 23, 13:45 UTCJul 24, 03:10 UTC13h 25m
2026-07-23 CHH424 BKK → CKG Jul 23, 04:50 UTCJul 24, 03:10 UTC22h 20m
2026-07-22 CHH423 CKG → BKK Jul 22, 11:35 UTCJul 23, 02:50 UTC15h 15m
2026-07-22 CHH423 CKG → BKK Jul 22, 04:35 UTCJul 23, 02:50 UTC22h 15m
2026-07-21 CHH423 CKG → BKK Jul 21, 10:55 UTCJul 22, 03:00 UTC16h 5m
2026-07-21 CHH424 BKK → CKG Jul 21, 04:35 UTCJul 22, 03:00 UTC22h 25m
2026-07-21 CHH423 CKG → BKK Jul 21, 01:25 UTCJul 21, 02:40 UTC1h 15m
2026-07-20 CHH424 BKK → CKG Jul 20, 04:35 UTCJul 21, 02:40 UTC22h 5m
2026-07-20 CHH423 CKG → BKK Jul 20, 02:15 UTCJul 20, 02:35 UTC20m
2026-07-19 CHH423 CKG → BKK Jul 19, 05:35 UTCJul 20, 01:25 UTC19h 50m
2026-07-19 CHH424 - Jul 19, 04:20 UTCJul 19, 04:35 UTC15m
2026-07-19 CHH423 CKG → BKK Jul 19, 01:15 UTCJul 19, 02:45 UTC1h 30m
2026-07-17 - - Jul 17, 05:50 UTCJul 17, 06:05 UTC15m
2026-07-16 CHH424 - Jul 16, 04:40 UTCJul 16, 06:00 UTC1h 20m
2026-07-16 CHH423 - Jul 16, 02:30 UTCJul 16, 02:45 UTC15m
2026-07-15 CHH423 - Jul 15, 13:30 UTCJul 16, 01:30 UTC12h 0m
2026-07-15 CHH424 - Jul 15, 04:30 UTCJul 16, 01:30 UTC21h 0m
2026-07-15 CHH423 - Jul 15, 02:35 UTCJul 15, 02:55 UTC20m
2026-07-14 CHH423 - Jul 14, 11:30 UTCJul 15, 01:35 UTC14h 4m
2026-07-14 CHH424 - Jul 14, 04:35 UTCJul 15, 01:35 UTC20h 59m
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

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 Jul 26, 11:10 UTC.
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, CHH424, CHH7048, CHH7061, CHH7047.