Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
Broadcasting now · callsign CHH7051 · 29,100 ft
Flights observed
105
Distinct callsigns
20
Country
CN
Last broadcast
20h ago

Current position

7821BB is currently broadcasting. Map zoomed to live position.

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
CHH7004 - 11 2026-06-29
CHH7008 Hainan Airlines 10 2026-06-13
CHH7038 Hainan Airlines 7 2026-06-16
CHH7002 Hainan Airlines 6 2026-06-14
CHH7116 - 4 2026-07-16
CHH7089 - 4 2026-07-06
CHH7044 Hainan Airlines 4 2026-06-07
CHH7939 Hainan Airlines 3 2026-05-13
CHH7092 Hainan Airlines 3 2026-06-27
CHH7052 - 3 2026-07-13
CHH7018 Hainan Airlines 3 2026-07-17
CHH7006 - 3 2026-07-05
CHH6054 - 3 2026-07-02
CHH7940 Hainan Airlines 2 2026-05-13
CHH7688 Hainan Airlines 2 2026-06-03
CHH7206 Hainan Airlines 2 2026-04-25
CHH7090 Hainan Airlines 2 2026-06-17
CHH7051 - 2 2026-07-12
CHH7049 - 2 2026-07-17
CHH7043 - 2 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CHH7049 - Jul 17, 05:25 UTCJul 17, 05:35 UTC10m
2026-07-17 CHH7018 ZUH → HAK Jul 17, 02:59 UTCJul 17, 03:14 UTC15m
2026-07-16 CHH7056 - Jul 16, 15:45 UTCJul 16, 16:00 UTC15m
2026-07-16 CHH7116 - Jul 16, 07:15 UTCJul 16, 07:30 UTC15m
2026-07-15 CHH7042 - Jul 15, 12:00 UTCJul 15, 17:15 UTC5h 15m
2026-07-14 CHH7116 - Jul 14, 01:50 UTCJul 14, 07:00 UTC5h 10m
2026-07-13 CHH7055 - Jul 13, 08:50 UTCJul 14, 07:00 UTC22h 10m
2026-07-13 CHH7052 - Jul 13, 01:01 UTCJul 13, 06:01 UTC5h 0m
2026-07-12 CHH7052 - Jul 12, 06:50 UTCJul 13, 06:01 UTC23h 10m
2026-07-12 CHH7051 - Jul 12, 06:40 UTCJul 13, 01:35 UTC18h 55m
2026-07-12 CHH7051 - Jul 12, 03:20 UTCJul 13, 01:35 UTC22h 15m
2026-07-09 CHH7078 - Jul 9, 00:35 UTCJul 9, 16:40 UTC16h 5m
2026-07-08 CHH7040 - Jul 8, 14:00 UTCJul 8, 14:10 UTC10m
2026-07-07 CHH7116 - Jul 7, 02:00 UTCJul 7, 15:05 UTC13h 5m
2026-07-06 CHH7116 - Jul 6, 15:00 UTCJul 7, 06:50 UTC15h 50m
2026-07-06 CHH7089 - Jul 6, 11:00 UTCJul 7, 06:50 UTC19h 50m
2026-07-05 CHH7006 - Jul 5, 01:55 UTCJul 5, 02:05 UTC10m
2026-07-04 CHH7306 - Jul 4, 01:10 UTCJul 4, 08:40 UTC7h 30m
2026-07-02 CHH6054 - Jul 2, 14:15 UTCJul 3, 07:00 UTC16h 45m
2026-07-02 CHH6054 - Jul 2, 09:25 UTCJul 3, 07:00 UTC21h 35m
2026-07-01 CHH6054 - Jul 1, 14:50 UTCJul 2, 14:45 UTC23h 55m
2026-07-01 CHH6053 - Jul 1, 00:35 UTCJul 1, 15:10 UTC14h 35m
2026-06-29 CHH7161 - Jun 29, 23:34 UTCJun 29, 23:44 UTC10m
2026-06-29 CHH7004 - Jun 29, 00:24 UTCJun 29, 00:34 UTC10m
2026-06-28 CHH7007 - Jun 28, 08:55 UTCJun 28, 09:05 UTC10m
2026-06-27 CHH7092 KMG → HAK Jun 27, 13:35 UTCJun 28, 05:29 UTC15h 55m
2026-06-27 CHH7092 KMG → HAK Jun 27, 09:00 UTCJun 28, 05:29 UTC20h 30m
2026-06-27 CHH7052 - Jun 27, 01:09 UTCJun 27, 05:59 UTC4h 50m
2026-06-26 CHH7092 KMG → HAK Jun 26, 05:10 UTCJun 26, 05:35 UTC25m
2026-06-25 CHH7094 KMG → HAK Jun 25, 00:29 UTCJun 25, 11:54 UTC11h 25m
2026-06-24 CHH7049 HAK → KWE Jun 24, 05:09 UTCJun 24, 15:39 UTC10h 30m
2026-06-22 CHH7215 - Jun 22, 04:34 UTCJun 22, 15:40 UTC11h 5m
2026-06-20 CHH7118 CSX → HAK Jun 20, 11:14 UTCJun 20, 11:25 UTC10m
2026-06-19 CHH7089 - Jun 19, 10:54 UTCJun 20, 03:54 UTC17h 0m
2026-06-19 CHH7043 - Jun 19, 02:14 UTCJun 19, 08:29 UTC6h 15m
2026-06-17 CHH7090 NKG → HAK Jun 17, 08:00 UTCJun 17, 15:10 UTC7h 10m
2026-06-16 CHH7038 HFE → HAK Jun 16, 10:09 UTCJun 16, 14:35 UTC4h 25m
2026-06-14 CHH7002 CAN → HAK Jun 14, 23:10 UTCJun 14, 23:20 UTC10m
2026-06-14 CHH7004 CAN → HAK Jun 14, 00:30 UTCJun 14, 00:40 UTC10m
2026-06-13 CHH7008 CAN → HAK Jun 13, 07:30 UTCJun 13, 07:40 UTC10m
2026-06-13 CHH7004 CAN → HAK Jun 13, 00:30 UTCJun 13, 00:50 UTC20m
2026-06-12 CHH7008 CAN → HAK Jun 12, 05:45 UTCJun 12, 05:55 UTC10m
2026-06-12 CHH7004 CAN → HAK Jun 12, 00:35 UTCJun 12, 00:45 UTC10m
2026-06-11 - - Jun 11, 05:00 UTCJun 11, 05:10 UTC10m
2026-06-08 CHH7265 HAK → XIY Jun 8, 05:35 UTCJun 8, 05:50 UTC15m
2026-06-07 CHH7044 TNA → HAK Jun 7, 02:10 UTCJun 7, 15:10 UTC13h 0m
2026-06-05 CHH7038 HFE → HAK Jun 5, 14:15 UTCJun 6, 05:25 UTC15h 10m
2026-06-03 CHH7688 NGB → HAK Jun 3, 23:40 UTCJun 4, 10:50 UTC11h 10m
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

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?
Yes. Mode-S 7821BB is currently airborne.
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 CHH7004, CHH7008, CHH7038, CHH7002, CHH7116.