Apparatus

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sensors Mode-S transponder

7818E1

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20EF · BOEING 757-200

Hex
7818E1
Octal
36014341
Decimal
7,870,689
Country
CN
Tail
B-20EF
Type
B752
No current signal · last broadcast 3d ago
Flights observed
83
Distinct callsigns
20
Country
CN
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S 7818E1.

Country allocation

The ICAO 24-bit address 7818E1 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
CSS326 - 10 2026-06-15
CSS325 - 6 2026-06-15
CSS7277 - 5 2026-06-11
CSS6840 SF Airlines 4 2026-06-12
CSS6839 SF Airlines 4 2026-06-11
CSS6805 SF Airlines 4 2026-06-17
CSS280 - 4 2026-07-13
CSS279 - 4 2026-07-13
CSS273 - 4 2026-06-25
CSS142 - 4 2026-07-13
CSS141 - 4 2026-07-11
CSS274 - 3 2026-06-25
CSS7278 - 2 2026-06-10
CSS6846 SF Airlines 2 2026-06-17
CSS6812 SF Airlines 2 2026-05-28
CSS272 - 2 2026-06-12
CSS271 - 2 2026-06-12
CSS7279 - 1 2026-07-26
CSS7249 - 1 2026-06-16
CSS7204 - 1 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSS7279 - Jul 26, 16:20 UTCJul 26, 16:30 UTC10m
2026-07-23 CSS264 - Jul 23, 13:20 UTCJul 23, 14:00 UTC40m
2026-07-23 CSS263 - Jul 23, 11:20 UTCJul 23, 12:00 UTC40m
2026-07-18 CSS7204 - Jul 18, 21:55 UTCJul 18, 22:05 UTC10m
2026-07-13 CSS142 - Jul 13, 14:55 UTCJul 13, 15:20 UTC25m
2026-07-13 CSS279 - Jul 13, 08:55 UTCJul 13, 09:20 UTC25m
2026-07-13 CSS280 - Jul 13, 05:40 UTCJul 13, 06:01 UTC20m
2026-07-11 CSS141 - Jul 11, 23:05 UTCJul 11, 23:25 UTC20m
2026-07-06 CSS7143 TSN → EHU Jul 6, 17:00 UTCJul 6, 17:15 UTC15m
2026-06-25 CSS274 - Jun 25, 03:10 UTCJun 25, 04:40 UTC1h 30m
2026-06-25 CSS273 - Jun 25, 00:09 UTCJun 25, 01:40 UTC1h 30m
2026-06-24 CSS273 - Jun 24, 04:20 UTCJun 25, 01:40 UTC21h 20m
2026-06-24 CSS274 - Jun 24, 03:15 UTCJun 25, 01:40 UTC22h 25m
2026-06-24 CSS273 - Jun 24, 00:15 UTCJun 24, 01:44 UTC1h 30m
2026-06-17 CSS6805 SZX → EHU Jun 17, 16:40 UTCJun 17, 16:50 UTC10m
2026-06-17 CSS314 - Jun 17, 09:50 UTCJun 17, 11:20 UTC1h 30m
2026-06-17 CSS313 SZX → BKK Jun 17, 05:20 UTCJun 17, 07:45 UTC2h 25m
2026-06-17 CSS6846 NTG → SZX Jun 17, 02:35 UTCJun 17, 02:50 UTC15m
2026-06-16 CSS6845 SZX → NTG Jun 16, 21:10 UTCJun 16, 21:20 UTC10m
2026-06-16 CSS7249 - Jun 16, 16:50 UTCJun 16, 17:30 UTC40m
2026-06-16 CSS6833 - Jun 16, 13:00 UTCJun 16, 13:09 UTC10m
2026-06-15 CSS326 - Jun 15, 23:19 UTCJun 15, 23:35 UTC15m
2026-06-15 CSS326 - Jun 15, 21:30 UTCJun 15, 22:05 UTC35m
2026-06-15 CSS325 - Jun 15, 18:55 UTCJun 15, 20:00 UTC1h 5m
2026-06-15 CSS325 - Jun 15, 18:04 UTCJun 15, 18:20 UTC15m
2026-06-14 CSS6925 - Jun 14, 23:29 UTCJun 14, 23:39 UTC10m
2026-06-12 CSS6924 SZX → WUH Jun 12, 20:50 UTCJun 12, 21:00 UTC10m
2026-06-12 CSS6840 WUX → SZX Jun 12, 18:40 UTCJun 12, 19:00 UTC20m
2026-06-12 CSS272 - Jun 12, 06:10 UTCJun 12, 07:20 UTC1h 10m
2026-06-12 CSS271 - Jun 12, 04:05 UTCJun 12, 04:55 UTC50m
2026-06-11 CSS6839 SZX → WUX Jun 11, 21:50 UTCJun 11, 22:00 UTC10m
2026-06-11 CSS7277 - Jun 11, 18:50 UTCJun 11, 19:30 UTC40m
2026-06-10 CSS7278 - Jun 10, 20:50 UTCJun 10, 21:00 UTC10m
2026-06-10 CSS6840 WUX → SZX Jun 10, 18:40 UTCJun 10, 18:50 UTC10m
2026-06-10 CSS272 - Jun 10, 06:25 UTCJun 10, 07:10 UTC45m
2026-06-10 CSS271 - Jun 10, 04:10 UTCJun 10, 04:55 UTC45m
2026-06-08 CSS326 MNL → SZX Jun 8, 23:00 UTCJun 8, 23:15 UTC15m
2026-06-08 CSS326 MNL → SZX Jun 8, 21:10 UTCJun 8, 21:40 UTC30m
2026-06-08 CSS325 SZX → MNL Jun 8, 17:00 UTCJun 8, 18:50 UTC1h 50m
2026-06-07 CSS6805 SZX → EHU Jun 7, 16:45 UTCJun 7, 17:00 UTC15m
2026-06-06 CSS326 MNL → SZX Jun 6, 22:39 UTCJun 6, 22:55 UTC15m
2026-06-06 CSS326 MNL → SZX Jun 6, 21:00 UTCJun 6, 21:35 UTC35m
2026-06-06 CSS325 SZX → MNL Jun 6, 17:05 UTCJun 6, 19:04 UTC2h 0m
2026-06-06 CSS6846 NTG → SZX Jun 6, 00:00 UTCJun 6, 00:15 UTC15m
2026-06-05 CSS358 TPE → SZX Jun 5, 01:35 UTCJun 5, 03:00 UTC1h 25m
2026-06-04 CSS357 SZX → TPE Jun 4, 23:25 UTCJun 4, 23:55 UTC30m
2026-05-31 CSS6805 SZX → EHU May 31, 16:55 UTCMay 31, 17:05 UTC10m
2026-05-30 CSS6814 PEK → SZX May 30, 22:25 UTCMay 30, 22:40 UTC15m
2026-05-30 CSS6813 SZX → PEK May 30, 18:10 UTCMay 30, 18:20 UTC10m
2026-05-29 CSS326 MNL → SZX May 29, 22:20 UTCMay 29, 22:35 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-20EF page for operator, model, and routing details .

Mode-S 7818E1 frequently asked

What is Mode-S code 7818E1?
7818E1 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20EF.
Where is Mode-S 7818E1 registered?
Mode-S code 7818E1 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7818E1 broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7818E1, octal 36014341, decimal 7,870,689.
What flights does 7818E1 operate?
Mode-S 7818E1 has broadcast 20 distinct callsigns, including CSS326, CSS325, CSS7277, CSS6840, CSS6839.