Apparatus

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sensors Mode-S transponder

7813BF

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-1298 · BOEING 737-800

Hex
7813BF
Octal
36011677
Decimal
7,869,375
Country
CN
Tail
B-1298
Type
B738
No current signal · last broadcast 5h ago
Flights observed
136
Distinct callsigns
20
Country
CN
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 7813BF.

Country allocation

The ICAO 24-bit address 7813BF 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
CSN3881 - 10 2026-07-02
CSN8437 - 9 2026-07-01
CSN5777 China Southern Airlines 8 2026-06-13
CSN3689 - 8 2026-07-03
CSN8285 - 7 2026-07-06
CSN3791 - 6 2026-07-12
CSN3771 - 6 2026-06-23
CSN3755 - 5 2026-06-28
CSN3735 - 5 2026-07-11
CSN3665 - 5 2026-07-13
CSN8701 - 4 2026-07-14
CSN3882 - 4 2026-07-02
CSN3781 China Southern Airlines 4 2026-04-25
CSN3767 China Southern Airlines 4 2026-05-29
CSN3749 - 4 2026-06-27
CSN8417 - 3 2026-07-01
CSN6906 China Southern Airlines 3 2026-06-21
CSN3761 - 3 2026-07-11
CSN3736 China Southern Airlines 3 2026-06-07
CSN3733 - 3 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CSN8702 - Jul 14, 17:40 UTCJul 14, 17:50 UTC10m
2026-07-14 CSN8701 - Jul 14, 13:05 UTCJul 14, 13:25 UTC20m
2026-07-14 CSN3789 - Jul 14, 00:00 UTCJul 14, 00:10 UTC10m
2026-07-13 CSN3665 - Jul 13, 00:20 UTCJul 13, 00:30 UTC10m
2026-07-12 CSN3791 - Jul 12, 02:10 UTCJul 12, 02:25 UTC15m
2026-07-11 CSN3735 - Jul 11, 08:35 UTCJul 11, 08:50 UTC15m
2026-07-11 CSN3761 - Jul 11, 00:00 UTCJul 11, 00:10 UTC10m
2026-07-10 CSN3665 - Jul 10, 00:30 UTCJul 10, 00:45 UTC15m
2026-07-09 CSN8701 - Jul 9, 11:15 UTCJul 9, 11:30 UTC15m
2026-07-09 CSN3733 - Jul 9, 02:15 UTCJul 9, 02:30 UTC15m
2026-07-08 CSN5733 - Jul 8, 16:30 UTCJul 8, 16:45 UTC15m
2026-07-08 CSN3465 - Jul 8, 00:35 UTCJul 8, 00:50 UTC15m
2026-07-07 CSN5844 - Jul 7, 15:45 UTCJul 7, 17:10 UTC1h 25m
2026-07-06 CSN3828 - Jul 6, 15:10 UTCJul 6, 16:00 UTC50m
2026-07-06 CSN8285 - Jul 6, 00:45 UTCJul 6, 01:00 UTC15m
2026-07-05 CSN8701 - Jul 5, 13:20 UTCJul 5, 13:30 UTC10m
2026-07-05 - - Jul 5, 08:00 UTCJul 5, 08:15 UTC15m
2026-07-05 CSN3733 - Jul 5, 02:20 UTCJul 5, 02:30 UTC10m
2026-07-04 CSN3735 - Jul 4, 09:35 UTCJul 4, 09:45 UTC10m
2026-07-03 CSN3689 - Jul 3, 01:25 UTCJul 3, 01:35 UTC10m
2026-07-02 CSN3882 - Jul 2, 14:50 UTCJul 2, 15:10 UTC20m
2026-07-02 CSN3881 - Jul 2, 09:30 UTCJul 2, 09:40 UTC10m
2026-07-01 CSN8437 - Jul 1, 07:45 UTCJul 1, 07:55 UTC10m
2026-07-01 CSN8418 - Jul 1, 05:50 UTCJul 1, 06:00 UTC10m
2026-07-01 CSN8417 - Jul 1, 01:05 UTCJul 1, 01:15 UTC10m
2026-06-30 CSN3882 - Jun 30, 13:55 UTCJun 30, 14:15 UTC20m
2026-06-30 CSN3881 - Jun 30, 09:15 UTCJun 30, 09:25 UTC10m
2026-06-29 CSN8437 - Jun 29, 07:25 UTCJun 29, 07:40 UTC15m
2026-06-29 CSN8285 - Jun 29, 00:29 UTCJun 29, 00:39 UTC10m
2026-06-28 CSN3756 - Jun 28, 10:35 UTCJun 28, 14:59 UTC4h 25m
2026-06-28 CSN3755 - Jun 28, 09:34 UTCJun 28, 09:50 UTC15m
2026-06-28 CSN8438 - Jun 28, 07:44 UTCJun 28, 07:54 UTC10m
2026-06-27 CSN3749 - Jun 27, 00:05 UTCJun 27, 00:20 UTC15m
2026-06-26 CSN3882 - Jun 26, 15:54 UTCJun 26, 16:14 UTC20m
2026-06-26 CSN3881 - Jun 26, 11:20 UTCJun 26, 11:30 UTC10m
2026-06-25 CSN8437 ZUH → TFU Jun 25, 09:50 UTCJun 25, 10:09 UTC20m
2026-06-24 CSN8437 ZUH → TFU Jun 24, 07:24 UTCJun 24, 07:44 UTC20m
2026-06-23 CSN3749 - Jun 23, 23:59 UTCJun 24, 00:15 UTC15m
2026-06-23 CSN3771 - Jun 23, 05:39 UTCJun 23, 06:04 UTC25m
2026-06-23 CSN3771 - Jun 23, 01:35 UTCJun 23, 01:50 UTC15m
2026-06-22 CSN3881 - Jun 22, 09:34 UTCJun 22, 09:49 UTC15m
2026-06-21 CSN6906 PKX → URC Jun 21, 12:49 UTCJun 21, 13:15 UTC25m
2026-06-21 CSN3735 - Jun 21, 08:20 UTCJun 21, 08:30 UTC10m
2026-06-21 CSN3665 ZUH → HFE Jun 21, 00:25 UTCJun 21, 00:34 UTC10m
2026-06-19 CSN3792 TYN → ZUH Jun 19, 08:44 UTCJun 19, 08:54 UTC10m
2026-06-19 CSN3791 - Jun 19, 02:09 UTCJun 19, 02:24 UTC15m
2026-06-18 CSN3720 LZH → CAN Jun 18, 17:21 UTCJun 18, 17:30 UTC9m
2026-06-18 CSN3719 CAN → LZH Jun 18, 12:25 UTCJun 18, 12:35 UTC10m
2026-06-18 CSN8285 - Jun 18, 00:50 UTCJun 18, 01:05 UTC15m
2026-06-17 CSN3881 ZUH → HGH Jun 17, 09:30 UTCJun 17, 09:45 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-1298 page for operator, model, and routing details .

Mode-S 7813BF frequently asked

What is Mode-S code 7813BF?
7813BF is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-1298.
Where is Mode-S 7813BF registered?
Mode-S code 7813BF is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7813BF broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7813BF, octal 36011677, decimal 7,869,375.
What flights does 7813BF operate?
Mode-S 7813BF has broadcast 20 distinct callsigns, including CSN3881, CSN8437, CSN5777, CSN3689, CSN8285.