Apparatus

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sensors Mode-S transponder

781EED

ICAO 24-bit transponder address · allocated to China

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

Hex
781EED
Octal
36017355
Decimal
7,872,237
Country
CN
Tail
B-222Y
Type
B738
No current signal · last broadcast Jul 26, 13:25 UTC
Flights observed
100
Distinct callsigns
4
Country
CN
Last broadcast
Jul 26, 13:25 UTC

Last known position

Most recent position reported by Mode-S 781EED.

Country allocation

The ICAO 24-bit address 781EED 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 4 distinct

Callsign Airline Flights Last seen
CTJ3859 - 56 2026-07-26
CTJ3860 - 41 2026-07-26
CTJ3864 - 2 2026-07-09
CTJ3885 - 1 2026-05-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CTJ3860 - Jul 26, 12:05 UTCJul 26, 13:25 UTC1h 20m
2026-07-26 CTJ3859 - Jul 26, 08:50 UTCJul 26, 10:10 UTC1h 20m
2026-07-24 CTJ3860 - Jul 24, 04:25 UTCJul 24, 05:45 UTC1h 20m
2026-07-24 CTJ3859 - Jul 24, 01:05 UTCJul 24, 02:45 UTC1h 40m
2026-07-23 CTJ3859 - Jul 23, 05:20 UTCJul 24, 02:45 UTC21h 25m
2026-07-23 CTJ3860 - Jul 23, 04:40 UTCJul 24, 02:45 UTC22h 5m
2026-07-23 CTJ3859 - Jul 23, 02:00 UTCJul 23, 02:25 UTC25m
2026-07-23 CTJ3859 - Jul 23, 01:00 UTCJul 23, 01:25 UTC25m
2026-07-22 CTJ3859 - Jul 22, 05:20 UTCJul 23, 01:25 UTC20h 5m
2026-07-22 CTJ3860 - Jul 22, 04:30 UTCJul 23, 01:25 UTC20h 55m
2026-07-22 CTJ3859 - Jul 22, 01:15 UTCJul 22, 02:40 UTC1h 25m
2026-07-21 CTJ3860 - Jul 21, 05:30 UTCJul 22, 02:40 UTC21h 10m
2026-07-21 CTJ3859 - Jul 21, 02:15 UTCJul 21, 03:45 UTC1h 30m
2026-07-19 CTJ3860 - Jul 19, 13:00 UTCJul 19, 14:25 UTC1h 25m
2026-07-19 CTJ3859 - Jul 19, 09:50 UTCJul 19, 10:05 UTC15m
2026-07-19 CTJ3859 - Jul 19, 08:40 UTCJul 19, 08:50 UTC10m
2026-07-17 CTJ3860 - Jul 17, 04:49 UTCJul 17, 06:10 UTC1h 20m
2026-07-17 CTJ3859 - Jul 17, 02:45 UTCJul 17, 02:59 UTC15m
2026-07-17 CTJ3859 - Jul 17, 01:29 UTCJul 17, 01:39 UTC10m
2026-07-16 CTJ3860 - Jul 16, 05:25 UTCJul 17, 01:39 UTC20h 15m
2026-07-16 CTJ3860 - Jul 16, 04:15 UTCJul 16, 04:25 UTC10m
2026-07-16 CTJ3859 - Jul 16, 02:25 UTCJul 16, 02:35 UTC10m
2026-07-13 CTJ3860 - Jul 13, 12:10 UTCJul 13, 13:30 UTC1h 20m
2026-07-13 CTJ3859 - Jul 13, 10:20 UTCJul 13, 10:35 UTC15m
2026-07-12 CTJ3860 - Jul 12, 17:25 UTCJul 12, 17:35 UTC10m
2026-07-12 CTJ3860 - Jul 12, 16:15 UTCJul 12, 16:30 UTC15m
2026-07-12 CTJ3859 - Jul 12, 14:30 UTCJul 12, 14:50 UTC20m
2026-07-12 CTJ3859 - Jul 12, 13:25 UTCJul 12, 13:35 UTC10m
2026-07-09 CTJ3864 - Jul 9, 20:45 UTCJul 9, 20:55 UTC10m
2026-07-09 CTJ3860 - Jul 9, 12:00 UTCJul 9, 13:25 UTC1h 25m
2026-07-09 CTJ3859 - Jul 9, 08:45 UTCJul 9, 10:15 UTC1h 30m
2026-07-08 CTJ3859 - Jul 8, 13:20 UTCJul 9, 10:15 UTC20h 55m
2026-07-08 CTJ3860 - Jul 8, 12:50 UTCJul 9, 10:15 UTC21h 25m
2026-07-08 CTJ3859 - Jul 8, 09:40 UTCJul 8, 11:05 UTC1h 25m
2026-07-06 CTJ3860 - Jul 6, 11:10 UTCJul 6, 12:30 UTC1h 20m
2026-07-06 CTJ3859 - Jul 6, 09:20 UTCJul 6, 09:55 UTC35m
2026-07-05 CTJ3860 - Jul 5, 11:25 UTCJul 6, 09:55 UTC22h 30m
2026-07-05 CTJ3859 - Jul 5, 09:25 UTCJul 5, 10:05 UTC40m
2026-07-02 CTJ3860 - Jul 2, 12:20 UTCJul 2, 12:45 UTC25m
2026-07-02 CTJ3859 - Jul 2, 08:50 UTCJul 2, 10:15 UTC1h 25m
2026-07-01 CTJ3859 - Jul 1, 13:20 UTCJul 2, 10:15 UTC20h 55m
2026-07-01 CTJ3859 - Jul 1, 13:05 UTCJul 2, 10:15 UTC21h 10m
2026-07-01 CTJ3860 - Jul 1, 12:10 UTCJul 1, 12:25 UTC15m
2026-07-01 CTJ3859 - Jul 1, 10:35 UTCJul 1, 10:50 UTC15m
2026-06-29 CTJ3860 - Jun 29, 12:45 UTCJun 29, 14:09 UTC1h 25m
2026-06-29 CTJ3859 - Jun 29, 09:25 UTCJun 29, 10:44 UTC1h 20m
2026-06-28 CTJ3859 - Jun 28, 13:40 UTCJun 29, 10:44 UTC21h 5m
2026-06-28 CTJ3859 - Jun 28, 12:25 UTCJun 29, 10:44 UTC22h 20m
2026-06-28 CTJ3859 - Jun 28, 08:55 UTCJun 28, 10:50 UTC1h 55m
2026-06-25 CTJ3860 - Jun 25, 13:20 UTCJun 25, 13:45 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-222Y page for operator, model, and routing details .

Mode-S 781EED frequently asked

What is Mode-S code 781EED?
781EED is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-222Y.
Where is Mode-S 781EED registered?
Mode-S code 781EED is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781EED broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 13:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781EED, octal 36017355, decimal 7,872,237.
What flights does 781EED operate?
Mode-S 781EED has broadcast 4 distinct callsigns, including CTJ3859, CTJ3860, CTJ3864, CTJ3885.