Apparatus

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sensors Mode-S transponder

7821BB

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-32K6 · AIRBUS A-320neo

Hex
7821BB
Octal
36020673
Decimal
7,872,955
Country
CN
Tail
B-32K6
Type
A20N
No current signal · last broadcast 6h ago
Flights observed
57
Distinct callsigns
20
Country
CN
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 7821BB.

Country allocation

The ICAO 24-bit address 7821BB 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
CHH7008 Hainan Airlines 8 2026-05-28
CHH7004 Hainan Airlines 7 2026-05-29
CHH7038 Hainan Airlines 5 2026-05-07
CHH7002 Hainan Airlines 5 2026-05-22
CHH7939 Hainan Airlines 3 2026-05-13
CHH7044 Hainan Airlines 3 2026-06-02
CHH7940 Hainan Airlines 2 2026-05-13
CHH7206 Hainan Airlines 2 2026-04-25
CHH7089 Hainan Airlines 2 2026-05-17
CHH7018 Hainan Airlines 2 2026-05-06
CHH7006 Hainan Airlines 2 2026-05-30
CHH7688 Hainan Airlines 1 2026-05-20
CHH722 Hainan Airlines 1 2026-04-22
CHH7216 Hainan Airlines 1 2026-05-30
CHH721 Hainan Airlines 1 2026-04-22
CHH7205 Hainan Airlines 1 2026-05-02
CHH7115 Hainan Airlines 1 2026-04-28
CHH7096 Hainan Airlines 1 2026-06-02
CHH7095 Hainan Airlines 1 2026-06-02
CHH7090 Hainan Airlines 1 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 CHH7096 NNG → HAK Jun 2, 16:15 UTCJun 2, 16:25 UTC10m
2026-06-02 CHH7095 HAK → NNG Jun 2, 13:45 UTCJun 2, 14:00 UTC15m
2026-06-02 CHH7044 TNA → HAK Jun 2, 01:55 UTCJun 2, 08:05 UTC6h 10m
2026-06-01 CHH7044 TNA → HAK Jun 1, 02:00 UTCJun 1, 08:05 UTC6h 5m
2026-05-30 CHH7216 NKG → HAK May 30, 04:30 UTCMay 30, 09:35 UTC5h 5m
2026-05-30 CHH7006 CAN → HAK May 30, 01:40 UTCMay 30, 02:00 UTC20m
2026-05-29 CHH7004 CAN → HAK May 29, 00:35 UTCMay 29, 00:45 UTC10m
2026-05-28 CHH7008 CAN → HAK May 28, 05:30 UTCMay 28, 05:45 UTC15m
2026-05-28 CHH7004 CAN → HAK May 28, 00:15 UTCMay 28, 00:40 UTC25m
2026-05-26 CHH7004 CAN → HAK May 26, 23:45 UTCMay 27, 00:00 UTC15m
2026-05-26 CHH7008 CAN → HAK May 26, 05:34 UTCMay 26, 05:49 UTC15m
2026-05-26 CHH7004 CAN → HAK May 26, 00:14 UTCMay 26, 00:35 UTC20m
2026-05-25 CHH7008 CAN → HAK May 25, 05:50 UTCMay 25, 06:05 UTC15m
2026-05-23 CHH7007 HAK → CAN May 23, 11:10 UTCMay 23, 11:20 UTC10m
2026-05-22 CHH7002 CAN → HAK May 22, 23:05 UTCMay 22, 23:30 UTC25m
2026-05-21 CHH7008 CAN → HAK May 21, 05:45 UTCMay 21, 06:00 UTC15m
2026-05-20 CHH7688 NGB → HAK May 20, 09:45 UTCMay 20, 10:05 UTC20m
2026-05-19 CHH7006 CAN → HAK May 19, 01:45 UTCMay 19, 02:00 UTC15m
2026-05-17 CHH7090 NKG → HAK May 17, 14:55 UTCMay 17, 15:05 UTC10m
2026-05-17 CHH7089 HAK → NKG May 17, 11:45 UTCMay 17, 11:55 UTC10m
2026-05-17 CHH7089 HAK → NKG May 17, 10:50 UTCMay 17, 11:10 UTC20m
2026-05-14 CHH7008 CAN → HAK May 14, 07:30 UTCMay 14, 07:50 UTC20m
2026-05-13 CHH7940 BKK → HAK May 13, 04:25 UTCMay 13, 05:05 UTC40m
2026-05-13 CHH7939 HAK → BKK May 13, 02:00 UTCMay 13, 02:40 UTC40m
2026-05-12 CHH7008 CAN → HAK May 12, 05:50 UTCMay 12, 06:00 UTC10m
2026-05-11 CHH7008 CAN → HAK May 11, 05:25 UTCMay 11, 05:50 UTC25m
2026-05-11 CHH7004 CAN → HAK May 11, 00:34 UTCMay 11, 00:49 UTC15m
2026-05-10 CHH7008 CAN → HAK May 10, 05:40 UTCMay 10, 05:55 UTC15m
2026-05-10 CHH7004 CAN → HAK May 10, 00:30 UTCMay 10, 00:45 UTC15m
2026-05-08 CHH7940 BKK → HAK May 8, 04:14 UTCMay 8, 14:20 UTC10h 5m
2026-05-08 CHH7939 HAK → BKK May 8, 01:49 UTCMay 8, 02:29 UTC40m
2026-05-07 CHH7038 HFE → HAK May 7, 14:15 UTCMay 7, 14:35 UTC20m
2026-05-06 CHH7018 ZUH → HAK May 6, 02:10 UTCMay 6, 02:20 UTC10m
2026-05-04 CHH7076 FOC → HAK May 4, 04:34 UTCMay 4, 05:05 UTC30m
2026-05-04 CHH7075 HAK → KHN May 4, 00:19 UTCMay 4, 00:45 UTC25m
2026-05-03 CHH7038 HFE → HAK May 3, 10:05 UTCMay 3, 14:50 UTC4h 45m
2026-05-02 CHH7002 CAN → HAK May 2, 23:20 UTCMay 2, 23:35 UTC15m
2026-05-02 CHH7205 CAN → TNA May 2, 10:40 UTCMay 2, 10:50 UTC10m
2026-05-01 CHH7044 TNA → HAK May 1, 02:10 UTCMay 1, 15:15 UTC13h 5m
2026-04-30 CHH7042 HGH → HAK Apr 30, 07:30 UTCApr 30, 13:30 UTC6h 0m
2026-04-29 CHH7038 HFE → HAK Apr 29, 16:10 UTCApr 30, 13:30 UTC21h 20m
2026-04-29 CHH7038 HFE → HAK Apr 29, 12:00 UTCApr 30, 07:30 UTC19h 29m
2026-04-29 CHH7043 HAK → TNA Apr 29, 02:20 UTCApr 29, 16:25 UTC14h 6m
2026-04-28 CHH7115 HAK → NKG Apr 28, 01:55 UTCApr 28, 02:15 UTC20m
2026-04-26 CHH7038 HFE → HAK Apr 26, 14:15 UTCApr 26, 14:30 UTC15m
2026-04-25 CHH7002 CAN → HAK Apr 25, 23:10 UTCApr 25, 23:20 UTC10m
2026-04-25 CHH7206 TNA → CAN Apr 25, 16:15 UTCApr 25, 16:30 UTC15m
2026-04-24 CHH7004 CAN → HAK Apr 24, 00:20 UTCApr 24, 00:40 UTC20m
2026-04-23 CHH7206 TNA → CAN Apr 23, 18:40 UTCApr 23, 18:55 UTC15m
2026-04-22 CHH722 BKK → HAK Apr 22, 12:45 UTCApr 22, 13:20 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-32K6 page for operator, model, and routing details .

Mode-S 7821BB frequently asked

What is Mode-S code 7821BB?
7821BB is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32K6.
Where is Mode-S 7821BB registered?
Mode-S code 7821BB is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7821BB broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7821BB, octal 36020673, decimal 7,872,955.
What flights does 7821BB operate?
Mode-S 7821BB has broadcast 20 distinct callsigns, including CHH7008, CHH7004, CHH7038, CHH7002, CHH7939.