Apparatus

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sensors Mode-S transponder

7BB051

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-2981 · BOEING 737-300

Hex
7BB051
Octal
36730121
Decimal
8,106,065
Country
CN
Tail
B-2981
Type
B733
No current signal · last broadcast 1d ago
Flights observed
62
Distinct callsigns
20
Country
CN
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 7BB051.

Country allocation

The ICAO 24-bit address 7BB051 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
CSS267 SF Airlines 11 2026-06-12
CSS268 SF Airlines 10 2026-06-12
CSS6813 - 5 2026-07-03
CSS7101 SF Airlines 4 2026-05-09
CSS6814 - 4 2026-06-30
CSS7410 - 3 2026-07-12
CSS7125 SF Airlines 3 2026-05-04
CSS266 SF Airlines 3 2026-05-29
CSS265 SF Airlines 3 2026-05-28
CSS7411 - 2 2026-07-12
CSS7067 - 2 2026-06-18
CSS7344 - 1 2026-06-29
CSS7115 SF Airlines 1 2026-05-03
CSS7070 - 1 2026-06-18
CSS6937 - 1 2026-06-26
CSS6852 - 1 2026-06-27
CSS6851 - 1 2026-06-27
CSS6837 - 1 2026-06-13
CSS6807 - 1 2026-06-14
CSS6806 SF Airlines 1 2026-04-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 CSS7410 - Jul 12, 20:01 UTCJul 12, 20:15 UTC15m
2026-07-12 CSS7411 - Jul 12, 18:45 UTCJul 12, 18:55 UTC10m
2026-07-03 CSS3013 - Jul 3, 22:30 UTCJul 3, 22:40 UTC10m
2026-07-03 CSS6813 - Jul 3, 18:40 UTCJul 3, 18:55 UTC15m
2026-06-30 CSS6814 - Jun 30, 22:10 UTCJun 30, 22:25 UTC15m
2026-06-29 CSS7344 - Jun 29, 22:15 UTCJun 29, 22:24 UTC10m
2026-06-29 CSS6813 - Jun 29, 18:19 UTCJun 29, 18:30 UTC10m
2026-06-27 CSS6852 - Jun 27, 22:15 UTCJun 27, 23:14 UTC1h 0m
2026-06-27 CSS6851 - Jun 27, 18:39 UTCJun 27, 18:49 UTC10m
2026-06-26 CSS6937 - Jun 26, 21:45 UTCJun 26, 21:59 UTC15m
2026-06-18 CSS7070 - Jun 18, 19:45 UTCJun 18, 20:00 UTC15m
2026-06-18 CSS7067 - Jun 18, 16:10 UTCJun 18, 16:20 UTC10m
2026-06-17 CSS7067 - Jun 17, 17:35 UTCJun 17, 17:50 UTC15m
2026-06-15 CSS3003 - Jun 15, 08:49 UTCJun 15, 09:05 UTC15m
2026-06-14 CSS6807 - Jun 14, 19:55 UTCJun 14, 20:15 UTC20m
2026-06-13 CSS6837 - Jun 13, 19:00 UTCJun 13, 19:15 UTC15m
2026-06-13 CSS6814 - Jun 13, 01:00 UTCJun 13, 01:10 UTC10m
2026-06-12 CSS6814 - Jun 12, 22:15 UTCJun 12, 22:35 UTC20m
2026-06-12 CSS268 HKG → HKG Jun 12, 05:05 UTCJun 12, 06:00 UTC55m
2026-06-12 CSS267 HKG → HKG Jun 12, 00:30 UTCJun 12, 01:25 UTC55m
2026-06-11 CSS268 HKG → HKG Jun 11, 03:05 UTCJun 12, 01:25 UTC22h 21m
2026-06-11 CSS267 HKG → HKG Jun 11, 00:50 UTCJun 11, 01:40 UTC50m
2026-06-09 CSS268 HKG → HKG Jun 9, 02:15 UTCJun 9, 03:10 UTC55m
2026-06-09 CSS267 HKG → HKG Jun 9, 00:20 UTCJun 9, 00:40 UTC20m
2026-06-06 CSS268 HKG → HKG Jun 6, 02:45 UTCJun 6, 02:55 UTC10m
2026-06-06 CSS267 HKG → HKG Jun 6, 00:05 UTCJun 6, 00:25 UTC20m
2026-06-05 CSS268 HKG → HKG Jun 5, 01:50 UTCJun 5, 02:40 UTC50m
2026-06-05 CSS267 HKG → HKG Jun 5, 00:15 UTCJun 5, 00:25 UTC10m
2026-06-04 - - Jun 4, 18:15 UTCJun 4, 18:25 UTC10m
2026-06-04 CSS268 HKG → HKG Jun 4, 03:40 UTCJun 4, 04:50 UTC1h 10m
2026-06-03 CSS267 HKG → HKG Jun 3, 23:55 UTCJun 4, 00:35 UTC40m
2026-06-03 CSS268 HKG → HKG Jun 3, 01:55 UTCJun 3, 02:45 UTC50m
2026-06-03 CSS267 HKG → HKG Jun 3, 00:10 UTCJun 3, 00:20 UTC10m
2026-06-02 CSS268 HKG → HKG Jun 2, 01:40 UTCJun 2, 02:40 UTC1h 0m
2026-06-02 CSS267 HKG → HKG Jun 2, 00:10 UTCJun 2, 00:25 UTC15m
2026-05-30 CSS268 HKG → HKG May 30, 02:00 UTCMay 30, 02:55 UTC55m
2026-05-29 CSS267 HKG → HKG May 29, 23:45 UTCMay 30, 00:35 UTC50m
2026-05-29 CSS266 TPE → NGB May 29, 01:55 UTCMay 29, 02:20 UTC25m
2026-05-28 CSS265 NGB → TPE May 28, 23:50 UTCMay 29, 00:20 UTC30m
2026-05-22 CSS266 TPE → NGB May 22, 01:55 UTCMay 22, 02:20 UTC25m
2026-05-21 CSS265 NGB → TPE May 21, 23:55 UTCMay 22, 00:20 UTC25m
2026-05-09 CSS7101 PEK → EHU May 9, 16:20 UTCMay 9, 16:35 UTC15m
2026-05-08 CSS7101 PEK → EHU May 8, 16:30 UTCMay 8, 16:40 UTC10m
2026-05-07 CSS7101 PEK → EHU May 7, 16:10 UTCMay 7, 16:25 UTC15m
2026-05-06 CSS7101 PEK → EHU May 6, 16:10 UTCMay 6, 16:30 UTC20m
2026-05-04 CSS7125 PEK → WUX May 4, 18:25 UTCMay 4, 18:35 UTC11m
2026-05-03 CSS7115 PEK → NTG May 3, 18:20 UTCMay 3, 18:34 UTC15m
2026-05-02 CSS7125 PEK → WUX May 2, 18:20 UTCMay 2, 18:30 UTC10m
2026-05-01 CSS7125 PEK → WUX May 1, 18:10 UTCMay 1, 18:20 UTC10m
2026-04-30 CSS6813 SZX → PEK Apr 30, 18:10 UTCApr 30, 18:20 UTC10m

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-2981 page for operator, model, and routing details .

Mode-S 7BB051 frequently asked

What is Mode-S code 7BB051?
7BB051 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-2981.
Where is Mode-S 7BB051 registered?
Mode-S code 7BB051 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7BB051 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7BB051, octal 36730121, decimal 8,106,065.
What flights does 7BB051 operate?
Mode-S 7BB051 has broadcast 20 distinct callsigns, including CSS267, CSS268, CSS6813, CSS7101, CSS6814.