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 Jul 25, 07:20 UTC
Flights observed
93
Distinct callsigns
20
Country
CN
Last broadcast
Jul 25, 07:20 UTC

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 20 distinct

Callsign Airline Flights Last seen
CHH7004 Hainan Airlines 11 2026-05-19
CHH7090 - 7 2026-07-15
CHH7008 Hainan Airlines 6 2026-05-15
CHH7002 - 6 2026-07-14
CHH7052 Hainan Airlines 5 2026-07-20
CHH7056 Hainan Airlines 4 2026-07-21
CHH7038 Hainan Airlines 4 2026-06-03
CHH7206 Hainan Airlines 3 2026-07-19
CHH7115 Hainan Airlines 3 2026-07-25
CHH7089 - 3 2026-06-29
CHH7044 - 3 2026-07-05
CHH7687 Hainan Airlines 2 2026-05-24
CHH7116 Hainan Airlines 2 2026-07-23
CHH7076 - 2 2026-06-30
CHH7075 - 2 2026-06-30
CHH7037 - 2 2026-07-04
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CHH7115 HAK → NKG Jul 25, 01:50 UTCJul 25, 07:20 UTC5h 30m
2026-07-23 CHH7116 NKG → HAK Jul 23, 02:05 UTCJul 23, 07:00 UTC4h 55m
2026-07-21 CHH7056 HGH → HAK Jul 21, 15:20 UTCJul 22, 15:15 UTC23h 55m
2026-07-21 CHH7056 HGH → HAK Jul 21, 01:50 UTCJul 21, 15:25 UTC13h 35m
2026-07-20 CHH7055 HAK → HGH Jul 20, 14:35 UTCJul 21, 09:55 UTC19h 20m
2026-07-20 CHH7052 HGH → HAK Jul 20, 10:30 UTCJul 21, 09:15 UTC22h 45m
2026-07-19 CHH7206 TNA → CAN Jul 19, 19:55 UTCJul 19, 20:05 UTC10m
2026-07-15 CHH7090 - Jul 15, 13:30 UTCJul 16, 06:25 UTC16h 55m
2026-07-15 - - Jul 15, 08:00 UTCJul 15, 08:10 UTC10m
2026-07-14 CHH7002 - Jul 14, 23:15 UTCJul 14, 23:40 UTC25m
2026-07-13 CHH7206 - Jul 13, 18:15 UTCJul 13, 18:25 UTC10m
2026-07-13 CHH7206 - Jul 13, 16:55 UTCJul 13, 17:05 UTC10m
2026-07-12 CHH7940 - Jul 12, 04:10 UTCJul 12, 13:55 UTC9h 45m
2026-07-12 CHH7939 - Jul 12, 02:30 UTCJul 12, 02:45 UTC15m
2026-07-11 CHH7070 - Jul 11, 02:05 UTCJul 11, 15:40 UTC13h 35m
2026-07-10 CHH7002 - Jul 10, 23:30 UTCJul 10, 23:50 UTC20m
2026-07-10 CHH7214 - Jul 10, 15:30 UTCJul 10, 15:45 UTC15m
2026-07-08 CHH7092 - Jul 8, 05:55 UTCJul 8, 06:10 UTC15m
2026-07-06 CHH7091 - Jul 6, 01:30 UTCJul 6, 06:10 UTC4h 40m
2026-07-05 CHH7044 - Jul 5, 09:15 UTCJul 5, 16:00 UTC6h 45m
2026-07-04 CHH7037 - Jul 4, 10:15 UTCJul 5, 09:15 UTC23h 0m
2026-07-03 CHH7002 - Jul 3, 23:25 UTCJul 3, 23:35 UTC10m
2026-07-02 CHH7056 - Jul 2, 01:10 UTCJul 2, 14:55 UTC13h 45m
2026-07-01 CHH7056 - Jul 1, 15:25 UTCJul 2, 14:55 UTC23h 30m
2026-07-01 CHH7052 - Jul 1, 12:15 UTCJul 2, 10:25 UTC22h 10m
2026-07-01 CHH7052 - Jul 1, 01:10 UTCJul 1, 09:45 UTC8h 35m
2026-06-30 CHH7076 - Jun 30, 03:55 UTCJun 30, 07:25 UTC3h 30m
2026-06-30 CHH7075 - Jun 30, 01:09 UTCJun 30, 02:05 UTC56m
2026-06-29 CHH7089 - Jun 29, 11:14 UTCJun 29, 15:00 UTC3h 45m
2026-06-29 CHH7044 - Jun 29, 02:14 UTCJun 29, 08:29 UTC6h 15m
2026-06-28 CHH7089 - Jun 28, 11:25 UTCJun 28, 16:14 UTC4h 50m
2026-06-24 - - Jun 24, 02:45 UTCJun 24, 02:54 UTC10m
2026-06-17 CHH6027 HAK → CSX Jun 17, 09:50 UTCJun 18, 07:30 UTC21h 40m
2026-06-15 CHH7093 HAK → KMG Jun 15, 06:45 UTCJun 15, 10:35 UTC3h 50m
2026-06-14 CHH7090 NKG → HAK Jun 14, 14:50 UTCJun 15, 03:55 UTC13h 5m
2026-06-14 CHH7090 NKG → HAK Jun 14, 07:10 UTCJun 15, 03:55 UTC20h 45m
2026-06-13 CHH7115 HAK → NKG Jun 13, 01:35 UTCJun 13, 15:40 UTC14h 4m
2026-06-12 CHH7115 HAK → NKG Jun 12, 14:25 UTCJun 13, 06:55 UTC16h 29m
2026-06-11 CHH7012 CAN → HAK Jun 11, 15:10 UTCJun 11, 15:20 UTC10m
2026-06-07 - - Jun 7, 05:30 UTCJun 7, 05:40 UTC10m
2026-06-05 CHH7052 HGH → HAK Jun 5, 05:20 UTCJun 6, 00:45 UTC19h 25m
2026-06-05 CHH7052 HGH → HAK Jun 5, 01:30 UTCJun 6, 00:45 UTC23h 15m
2026-06-03 CHH7038 HFE → HAK Jun 3, 14:00 UTCJun 4, 07:30 UTC17h 30m
2026-06-03 CHH7038 HFE → HAK Jun 3, 03:45 UTCJun 4, 02:00 UTC22h 15m
2026-06-03 CHH7038 HFE → HAK Jun 3, 00:40 UTCJun 3, 14:20 UTC13h 40m
2026-06-02 CHH7076 FOC → HAK Jun 2, 03:05 UTCJun 2, 04:05 UTC1h 0m
2026-06-02 CHH7075 HAK → KHN Jun 2, 00:35 UTCJun 2, 00:55 UTC20m
2026-05-31 CHH7090 NKG → HAK May 31, 14:45 UTCJun 1, 06:20 UTC15h 35m
2026-05-30 CHH7038 HFE → HAK May 30, 14:10 UTCMay 30, 14:20 UTC10m
2026-05-29 CHH7089 HAK → NKG May 29, 02:30 UTCMay 29, 12:15 UTC9h 45m

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 Jul 25, 07:20 UTC.
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 20 distinct callsigns, including CHH7004, CHH7090, CHH7008, CHH7002, CHH7052.