Apparatus

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sensors Mode-S transponder

7821BD

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-32K7 · AIRBUS A-320neo

Hex
7821BD
Octal
36020675
Decimal
7,872,957
Country
CN
Tail
B-32K7
Type
A20N
No current signal · last broadcast 13h ago
Flights observed
44
Distinct callsigns
19
Country
CN
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S 7821BD.

Country allocation

The ICAO 24-bit address 7821BD 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 19 distinct

Callsign Airline Flights Last seen
CHH7004 Hainan Airlines 11 2026-05-19
CHH7008 Hainan Airlines 6 2026-05-15
CHH7090 Hainan Airlines 3 2026-05-27
CHH7002 Hainan Airlines 3 2026-05-10
CHH7687 Hainan Airlines 2 2026-05-24
CHH7034 Hainan Airlines 2 2026-04-25
CHH7018 Hainan Airlines 2 2026-05-26
CHH7007 Hainan Airlines 2 2026-05-19
CHH7005 Hainan Airlines 2 2026-04-19
CHH7370 - 1 2026-05-09
CHH7361 - 1 2026-04-14
CHH722 Hainan Airlines 1 2026-05-05
CHH7216 Hainan Airlines 1 2026-05-23
CHH721 Hainan Airlines 1 2026-05-05
CHH7116 Hainan Airlines 1 2026-05-28
CHH7089 Hainan Airlines 1 2026-05-29
CHH7044 Hainan Airlines 1 2026-05-11
CHH7037 Hainan Airlines 1 2026-04-20
CHH7006 Hainan Airlines 1 2026-05-23

Recent flights last 44

DateFlightRouteTakeoffLandingDuration
2026-05-29 CHH7089 HAK → NKG May 29, 02:30 UTCMay 29, 12:15 UTC9h 45m
2026-05-28 CHH7116 NKG → HAK May 28, 01:50 UTCMay 28, 15:30 UTC13h 40m
2026-05-27 CHH7090 NKG → HAK May 27, 14:55 UTCMay 28, 06:55 UTC16h 0m
2026-05-27 CHH7090 NKG → HAK May 27, 11:00 UTCMay 28, 06:55 UTC19h 55m
2026-05-27 CHH7090 NKG → HAK May 27, 02:14 UTCMay 27, 15:15 UTC13h 1m
2026-05-26 CHH7018 ZUH → HAK May 26, 02:15 UTCMay 26, 02:24 UTC10m
2026-05-24 CHH7687 NGB → TAO May 24, 23:30 UTCMay 25, 10:05 UTC10h 35m
2026-05-24 CHH7687 NGB → TAO May 24, 07:50 UTCMay 24, 23:46 UTC15h 56m
2026-05-23 CHH7216 NKG → HAK May 23, 04:45 UTCMay 23, 09:35 UTC4h 50m
2026-05-23 CHH7006 CAN → HAK May 23, 01:45 UTCMay 23, 02:00 UTC15m
2026-05-19 CHH7007 HAK → CAN May 19, 09:00 UTCMay 19, 09:20 UTC20m
2026-05-19 CHH7004 CAN → HAK May 19, 00:20 UTCMay 19, 00:40 UTC20m
2026-05-18 CHH7004 CAN → HAK May 18, 00:10 UTCMay 18, 00:20 UTC10m
2026-05-15 CHH7008 CAN → HAK May 15, 08:45 UTCMay 15, 09:00 UTC15m
2026-05-15 CHH7004 CAN → HAK May 15, 00:40 UTCMay 15, 00:55 UTC15m
2026-05-13 CHH7008 CAN → HAK May 13, 05:35 UTCMay 13, 05:55 UTC20m
2026-05-11 CHH7044 TNA → HAK May 11, 02:10 UTCMay 11, 15:15 UTC13h 5m
2026-05-10 CHH7002 CAN → HAK May 10, 23:05 UTCMay 10, 23:19 UTC15m
2026-05-10 - - May 10, 16:20 UTCMay 10, 16:30 UTC10m
2026-05-09 CHH7370 - May 9, 00:25 UTCMay 9, 04:15 UTC3h 50m
2026-05-05 CHH722 BKK → HAK May 5, 12:30 UTCMay 5, 13:05 UTC35m
2026-05-05 CHH721 HAK → BKK May 5, 10:55 UTCMay 5, 11:15 UTC20m
2026-05-05 CHH7004 CAN → HAK May 5, 00:10 UTCMay 5, 00:20 UTC10m
2026-05-03 CHH7004 CAN → HAK May 3, 00:25 UTCMay 3, 00:35 UTC10m
2026-04-28 CHH7008 CAN → HAK Apr 28, 05:30 UTCApr 28, 05:50 UTC20m
2026-04-28 CHH7004 CAN → HAK Apr 28, 00:05 UTCApr 28, 00:20 UTC15m
2026-04-27 CHH7004 CAN → HAK Apr 27, 00:25 UTCApr 27, 00:40 UTC15m
2026-04-25 CHH7034 CGO → HAK Apr 25, 07:10 UTCApr 25, 14:55 UTC7h 45m
2026-04-24 CHH7002 CAN → HAK Apr 24, 23:05 UTCApr 24, 23:20 UTC15m
2026-04-24 CHH7018 ZUH → HAK Apr 24, 03:05 UTCApr 24, 03:15 UTC10m
2026-04-20 CHH7037 HAK → HFE Apr 20, 09:45 UTCApr 20, 14:55 UTC5h 10m
2026-04-20 CHH7034 CGO → HAK Apr 20, 07:05 UTCApr 20, 07:25 UTC20m
2026-04-19 CHH7002 CAN → HAK Apr 19, 23:00 UTCApr 19, 23:15 UTC15m
2026-04-19 CHH7005 HAK → CAN Apr 19, 03:20 UTCApr 19, 03:45 UTC25m
2026-04-19 CHH7004 CAN → HAK Apr 19, 00:15 UTCApr 19, 00:25 UTC10m
2026-04-16 CHH7008 CAN → HAK Apr 16, 05:34 UTCApr 16, 05:49 UTC15m
2026-04-15 CHH7004 CAN → HAK Apr 15, 23:50 UTCApr 16, 00:05 UTC15m
2026-04-15 CHH7008 CAN → HAK Apr 15, 05:25 UTCApr 15, 05:40 UTC15m
2026-04-14 CHH7004 CAN → HAK Apr 14, 23:55 UTCApr 15, 00:10 UTC15m
2026-04-14 CHH7361 - Apr 14, 10:45 UTCApr 14, 10:55 UTC10m
2026-04-14 CHH7008 - Apr 14, 05:20 UTCApr 14, 05:35 UTC15m
2026-04-13 CHH7007 - Apr 13, 08:25 UTCApr 13, 08:35 UTC10m
2026-04-13 CHH7005 - Apr 13, 03:15 UTCApr 13, 03:30 UTC15m
2026-04-13 CHH7004 CAN → HAK Apr 13, 00:20 UTCApr 13, 00:35 UTC15m

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-32K7 page for operator, model, and routing details .

Mode-S 7821BD frequently asked

What is Mode-S code 7821BD?
7821BD is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32K7.
Where is Mode-S 7821BD registered?
Mode-S code 7821BD is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7821BD broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7821BD, octal 36020675, decimal 7,872,957.
What flights does 7821BD operate?
Mode-S 7821BD has broadcast 19 distinct callsigns, including CHH7004, CHH7008, CHH7090, CHH7002, CHH7687.