Apparatus

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sensors Mode-S transponder

781E5B

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-222L · BOEING 737-800

Hex
781E5B
Octal
36017133
Decimal
7,872,091
Country
CN
Tail
B-222L
Type
B738
No current signal · last broadcast 1d ago
Flights observed
126
Distinct callsigns
7
Country
CN
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 781E5B.

Country allocation

The ICAO 24-bit address 781E5B 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 7 distinct

Callsign Airline Flights Last seen
CTJ3828 - 59 2026-07-04
CTJ3827 - 57 2026-07-04
CTJ3802 - 4 2026-07-13
CTJ3801 - 3 2026-07-13
CTJ3889 - 1 2026-06-16
CTJ3828N - 1 2026-05-18
CTJ3826 - 1 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CTJ3802 - Jul 13, 06:50 UTCJul 13, 07:15 UTC25m
2026-07-13 CTJ3801 - Jul 13, 04:40 UTCJul 13, 05:01 UTC20m
2026-07-04 CTJ3828 - Jul 4, 05:40 UTCJul 4, 05:55 UTC15m
2026-07-04 CTJ3827 - Jul 4, 03:45 UTCJul 4, 04:15 UTC30m
2026-07-02 CTJ3828 - Jul 2, 18:10 UTCJul 2, 18:30 UTC20m
2026-07-02 CTJ3827 - Jul 2, 15:50 UTCJul 2, 16:25 UTC35m
2026-07-01 CTJ3828 - Jul 1, 18:40 UTCJul 1, 19:00 UTC20m
2026-07-01 CTJ3827 - Jul 1, 16:05 UTCJul 1, 16:25 UTC20m
2026-06-30 CTJ3828 - Jun 30, 19:45 UTCJun 30, 22:20 UTC2h 35m
2026-06-30 CTJ3827 - Jun 30, 16:00 UTCJun 30, 16:25 UTC25m
2026-06-29 CTJ3802 - Jun 29, 06:44 UTCJun 29, 07:15 UTC30m
2026-06-28 CTJ3801 - Jun 28, 17:50 UTCJun 29, 05:04 UTC11h 15m
2026-06-28 CTJ3827 - Jun 28, 15:55 UTCJun 28, 16:25 UTC30m
2026-06-27 CTJ3828 - Jun 27, 17:59 UTCJun 27, 18:15 UTC15m
2026-06-27 CTJ3827 - Jun 27, 16:00 UTCJun 27, 16:20 UTC20m
2026-06-26 CTJ3828 - Jun 26, 19:30 UTCJun 26, 22:10 UTC2h 40m
2026-06-26 CTJ3802 - Jun 26, 07:00 UTCJun 26, 17:54 UTC10h 55m
2026-06-25 CTJ3828 - Jun 25, 21:29 UTCJun 26, 05:10 UTC7h 40m
2026-06-25 CTJ3827 - Jun 25, 19:09 UTCJun 25, 19:39 UTC30m
2026-06-24 CTJ3802 - Jun 24, 06:55 UTCJun 24, 09:45 UTC2h 50m
2026-06-24 CTJ3801 - Jun 24, 02:30 UTCJun 24, 05:09 UTC2h 40m
2026-06-23 CTJ3828 - Jun 23, 19:55 UTCJun 23, 22:34 UTC2h 40m
2026-06-23 CTJ3827 - Jun 23, 16:09 UTCJun 23, 16:35 UTC25m
2026-06-21 CTJ3828 - Jun 21, 19:14 UTCJun 21, 21:54 UTC2h 40m
2026-06-21 CTJ3827 - Jun 21, 16:04 UTCJun 21, 16:39 UTC35m
2026-06-20 CTJ3828 - Jun 20, 18:04 UTCJun 20, 20:34 UTC2h 30m
2026-06-20 CTJ3827 - Jun 20, 16:09 UTCJun 20, 16:29 UTC20m
2026-06-19 CTJ3828 - Jun 19, 18:54 UTCJun 19, 21:39 UTC2h 45m
2026-06-19 CTJ3827 - Jun 19, 16:14 UTCJun 19, 16:39 UTC25m
2026-06-18 CTJ3828 - Jun 18, 18:25 UTCJun 18, 21:10 UTC2h 45m
2026-06-17 CTJ3827 - Jun 17, 23:30 UTCJun 18, 16:55 UTC17h 25m
2026-06-17 CTJ3828 - Jun 17, 20:50 UTCJun 18, 16:55 UTC20h 5m
2026-06-17 CTJ3827 - Jun 17, 19:15 UTCJun 17, 19:25 UTC10m
2026-06-17 CTJ3828 - Jun 17, 11:00 UTCJun 17, 13:40 UTC2h 40m
2026-06-17 CTJ3827 - Jun 17, 09:30 UTCJun 17, 09:45 UTC15m
2026-06-16 CTJ3889 - Jun 16, 10:15 UTCJun 16, 11:15 UTC1h 0m
2026-06-15 CTJ3828 - Jun 15, 18:15 UTCJun 15, 18:29 UTC15m
2026-06-15 CTJ3827 - Jun 15, 16:19 UTCJun 15, 16:40 UTC20m
2026-06-14 CTJ3828 - Jun 14, 18:10 UTCJun 15, 14:10 UTC20h 0m
2026-06-14 CTJ3827 - Jun 14, 16:30 UTCJun 14, 16:45 UTC15m
2026-06-13 CTJ3828 - Jun 13, 18:05 UTCJun 13, 18:20 UTC15m
2026-06-13 CTJ3827 - Jun 13, 16:40 UTCJun 13, 17:00 UTC20m
2026-06-13 CTJ3828 - Jun 13, 08:15 UTCJun 13, 11:05 UTC2h 50m
2026-06-12 CTJ3827 - Jun 12, 22:40 UTCJun 13, 06:10 UTC7h 29m
2026-06-11 CTJ3828 - Jun 11, 09:55 UTCJun 11, 12:35 UTC2h 40m
2026-06-10 CTJ3827 - Jun 10, 12:50 UTCJun 11, 08:35 UTC19h 45m
2026-06-10 CTJ3828 - Jun 10, 10:05 UTCJun 10, 10:20 UTC15m
2026-06-10 CTJ3827 CRK → CRK Jun 10, 08:20 UTCJun 10, 08:45 UTC25m
2026-06-09 CTJ3828 - Jun 9, 10:20 UTCJun 9, 22:35 UTC12h 15m
2026-06-09 CTJ3827 CRK → CRK Jun 9, 08:40 UTCJun 9, 09:05 UTC25m

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-222L page for operator, model, and routing details .

Mode-S 781E5B frequently asked

What is Mode-S code 781E5B?
781E5B is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-222L.
Where is Mode-S 781E5B registered?
Mode-S code 781E5B is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781E5B 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 781E5B, octal 36017133, decimal 7,872,091.
What flights does 781E5B operate?
Mode-S 781E5B has broadcast 7 distinct callsigns, including CTJ3828, CTJ3827, CTJ3802, CTJ3801, CTJ3889.