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
57
Distinct callsigns
3
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 3 distinct

Callsign Airline Flights Last seen
CTJ3828 - 29 2026-05-29
CTJ3827 Tianjin Air Cargo 27 2026-05-29
CTJ3828N - 1 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 CTJ3828 - May 29, 10:25 UTCMay 29, 10:40 UTC15m
2026-05-29 CTJ3827 CRK → CRK May 29, 08:35 UTCMay 29, 09:00 UTC25m
2026-05-28 CTJ3828 - May 28, 10:15 UTCMay 28, 10:25 UTC10m
2026-05-28 CTJ3827 CRK → CRK May 28, 08:30 UTCMay 28, 09:00 UTC30m
2026-05-27 CTJ3828 - May 27, 12:40 UTCMay 27, 13:20 UTC40m
2026-05-27 CTJ3828 - May 27, 10:25 UTCMay 27, 10:40 UTC15m
2026-05-27 CTJ3827 CRK → CRK May 27, 08:40 UTCMay 27, 09:10 UTC30m
2026-05-26 CTJ3828 - May 26, 10:05 UTCMay 26, 10:14 UTC10m
2026-05-26 CTJ3827 CRK → CRK May 26, 08:15 UTCMay 26, 08:34 UTC20m
2026-05-24 CTJ3828 - May 24, 18:05 UTCMay 24, 18:25 UTC20m
2026-05-24 CTJ3827 CRK → CRK May 24, 16:20 UTCMay 24, 16:40 UTC20m
2026-05-23 CTJ3828 - May 23, 18:15 UTCMay 23, 18:35 UTC20m
2026-05-23 CTJ3827 CRK → CRK May 23, 16:20 UTCMay 23, 16:35 UTC15m
2026-05-22 CTJ3828 - May 22, 10:00 UTCMay 22, 10:15 UTC15m
2026-05-22 CTJ3827 CRK → CRK May 22, 08:25 UTCMay 22, 08:55 UTC30m
2026-05-21 CTJ3828 - May 21, 10:15 UTCMay 21, 10:35 UTC20m
2026-05-21 CTJ3827 CRK → CRK May 21, 08:20 UTCMay 21, 08:45 UTC25m
2026-05-20 CTJ3828 - May 20, 10:50 UTCMay 20, 11:05 UTC15m
2026-05-20 CTJ3827 CRK → CRK May 20, 08:10 UTCMay 20, 08:35 UTC25m
2026-05-19 CTJ3828 - May 19, 09:40 UTCMay 19, 09:55 UTC15m
2026-05-19 CTJ3827 CRK → CRK May 19, 08:15 UTCMay 19, 08:35 UTC20m
2026-05-18 CTJ3828N - May 18, 10:05 UTCMay 18, 10:15 UTC10m
2026-05-18 CTJ3827 CRK → CRK May 18, 08:30 UTCMay 18, 08:55 UTC25m
2026-05-17 CTJ3828 - May 17, 18:01 UTCMay 17, 18:15 UTC15m
2026-05-17 CTJ3827 CRK → CRK May 17, 16:10 UTCMay 17, 16:35 UTC25m
2026-05-16 CTJ3828 - May 16, 17:45 UTCMay 16, 18:05 UTC20m
2026-05-16 CTJ3827 CRK → CRK May 16, 16:10 UTCMay 16, 16:25 UTC15m
2026-05-15 CTJ3828 - May 15, 06:05 UTCMay 15, 06:25 UTC20m
2026-05-15 CTJ3827 CRK → CRK May 15, 04:10 UTCMay 15, 04:25 UTC15m
2026-05-12 CTJ3828 - May 12, 06:10 UTCMay 12, 06:30 UTC20m
2026-05-12 CTJ3827 CRK → CRK May 12, 04:25 UTCMay 12, 04:40 UTC15m
2026-05-09 CTJ3828 - May 9, 09:05 UTCMay 9, 09:25 UTC20m
2026-05-09 CTJ3827 CRK → CRK May 9, 07:25 UTCMay 9, 07:55 UTC30m
2026-04-30 CTJ3828 - Apr 30, 21:55 UTCApr 30, 22:05 UTC10m
2026-04-30 CTJ3827 CRK → CRK Apr 30, 20:20 UTCApr 30, 20:40 UTC20m
2026-04-29 CTJ3828 - Apr 29, 21:00 UTCApr 29, 21:15 UTC15m
2026-04-29 CTJ3827 CRK → CRK Apr 29, 19:20 UTCApr 29, 19:35 UTC15m
2026-04-27 CTJ3828 - Apr 27, 21:05 UTCApr 27, 21:25 UTC20m
2026-04-27 CTJ3827 CRK → CRK Apr 27, 19:20 UTCApr 27, 19:35 UTC15m
2026-04-26 CTJ3828 - Apr 26, 19:50 UTCApr 26, 20:10 UTC20m
2026-04-26 CTJ3827 CRK → CRK Apr 26, 16:55 UTCApr 26, 18:25 UTC1h 30m
2026-04-24 CTJ3828 - Apr 24, 22:10 UTCApr 24, 22:25 UTC15m
2026-04-24 CTJ3828 - Apr 24, 21:00 UTCApr 24, 21:15 UTC15m
2026-04-24 CTJ3827 CRK → CRK Apr 24, 18:10 UTCApr 24, 19:45 UTC1h 35m
2026-04-22 CTJ3828 - Apr 22, 21:05 UTCApr 22, 21:20 UTC15m
2026-04-22 CTJ3827 CRK → CRK Apr 22, 18:25 UTCApr 22, 19:40 UTC1h 15m
2026-04-20 CTJ3828 - Apr 20, 21:05 UTCApr 20, 21:15 UTC10m
2026-04-20 CTJ3827 CRK → CRK Apr 20, 19:35 UTCApr 20, 19:50 UTC15m
2026-04-19 CTJ3828 - Apr 19, 18:10 UTCApr 19, 19:35 UTC1h 25m
2026-04-19 CTJ3827 CRK → CRK Apr 19, 16:05 UTCApr 19, 16:25 UTC20m

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 3 distinct callsigns, including CTJ3828, CTJ3827, CTJ3828N.