Apparatus

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sensors Mode-S transponder

781549

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-206T · BOEING 737-800

Hex
781549
Octal
36012511
Decimal
7,869,769
Country
CN
Tail
B-206T
Type
B738
No current signal · last broadcast 4h ago
Flights observed
54
Distinct callsigns
20
Country
CN
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 781549.

Country allocation

The ICAO 24-bit address 781549 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
CCA1659 Air China 6 2026-06-06
CCA1649 Air China 6 2026-06-07
CCA1921 - 4 2026-05-30
CCA1909 - 4 2026-05-08
CCA1123 Air China 4 2026-06-06
CCA1627 Air China 2 2026-05-02
CCA1282 - 2 2026-05-21
CCA1281 - 2 2026-05-21
CCA8145 Air China 1 2026-05-29
CCA4132 Air China 1 2026-04-28
CCA1953 Air China 1 2026-05-17
CCA1922 - 1 2026-04-22
CCA1914 Air China 1 2026-04-25
CCA1911 - 1 2026-04-24
CCA1813 Air China 1 2026-06-05
CCA1587 Air China 1 2026-06-02
CCA1536 Air China 1 2026-04-21
CCA1496 Air China 1 2026-05-20
CCA1495 Air China 1 2026-05-20
CCA1461 Air China 1 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-07 CCA1649 PEK → CGQ Jun 7, 05:20 UTCJun 7, 05:30 UTC10m
2026-06-06 CCA1659 PEK → NDG Jun 6, 23:09 UTCJun 6, 23:19 UTC10m
2026-06-06 CCA1123 PEK → TGO Jun 6, 12:00 UTCJun 6, 12:10 UTC10m
2026-06-06 CCA1649 PEK → CGQ Jun 6, 05:35 UTCJun 6, 05:45 UTC10m
2026-06-05 CCA1150 DSN → PEK Jun 5, 11:25 UTCJun 5, 11:45 UTC20m
2026-06-05 CCA1149 PEK → DSN Jun 5, 08:45 UTCJun 5, 09:00 UTC15m
2026-06-05 CCA1813 PEK → HFE Jun 5, 00:10 UTCJun 5, 00:20 UTC10m
2026-06-04 CCA1413 PEK → KMG Jun 4, 08:15 UTCJun 4, 15:30 UTC7h 15m
2026-06-03 CCA1270 ENY → PEK Jun 3, 14:40 UTCJun 3, 15:00 UTC20m
2026-06-03 CCA1269 PEK → ENY Jun 3, 11:20 UTCJun 3, 11:40 UTC20m
2026-06-03 CCA1127 PEK → YCU Jun 3, 04:20 UTCJun 3, 04:35 UTC15m
2026-06-02 CCA1587 PEK → WEH Jun 2, 23:10 UTCJun 2, 23:20 UTC10m
2026-05-30 CCA1461 PEK → KWE May 30, 23:10 UTCMay 30, 23:30 UTC20m
2026-05-30 CCA1921 - May 30, 09:00 UTCMay 30, 09:15 UTC15m
2026-05-29 CCA8145 HET → HAK May 29, 10:20 UTCMay 29, 10:30 UTC10m
2026-05-21 CCA1921 - May 21, 09:05 UTCMay 21, 09:20 UTC15m
2026-05-21 CCA1282 - May 21, 05:45 UTCMay 21, 06:05 UTC20m
2026-05-21 CCA1281 - May 21, 01:25 UTCMay 21, 01:45 UTC20m
2026-05-20 CCA1496 YBP → PEK May 20, 14:25 UTCMay 20, 14:35 UTC10m
2026-05-20 CCA1495 PEK → YBP May 20, 08:50 UTCMay 20, 09:00 UTC10m
2026-05-20 CCA1148 RLK → PEK May 20, 04:40 UTCMay 20, 05:00 UTC20m
2026-05-20 CCA1147 PEK → RLK May 20, 01:40 UTCMay 20, 02:00 UTC20m
2026-05-18 CCA1123 PEK → TGO May 18, 11:50 UTCMay 18, 12:05 UTC15m
2026-05-17 CCA1659 PEK → NDG May 17, 23:15 UTCMay 17, 23:25 UTC10m
2026-05-17 CCA1953 PEK → DYG May 17, 11:35 UTCMay 17, 11:55 UTC20m
2026-05-09 CCA1921 - May 9, 08:50 UTCMay 9, 09:05 UTC15m
2026-05-08 CCA1909 - May 8, 23:40 UTCMay 9, 00:00 UTC20m
2026-05-07 CCA1659 PEK → NDG May 7, 23:09 UTCMay 7, 23:19 UTC10m
2026-05-07 CCA1921 - May 7, 08:50 UTCMay 7, 09:05 UTC15m
2026-05-06 CCA1909 - May 6, 23:45 UTCMay 7, 00:05 UTC20m
2026-05-06 CCA1123 PEK → TGO May 6, 12:30 UTCMay 6, 12:40 UTC10m
2026-05-06 CCA1649 PEK → CGQ May 6, 06:00 UTCMay 6, 06:10 UTC10m
2026-05-05 CCA1659 PEK → NDG May 5, 23:05 UTCMay 5, 23:15 UTC10m
2026-05-05 CCA1284 - May 5, 13:40 UTCMay 5, 13:50 UTC10m
2026-05-05 CCA1283 - May 5, 09:15 UTCMay 5, 09:45 UTC30m
2026-05-02 CCA1627 PEK → CGQ May 2, 02:00 UTCMay 2, 02:10 UTC10m
2026-05-01 CCA1123 PEK → TGO May 1, 11:55 UTCMay 1, 12:05 UTC10m
2026-05-01 CCA1649 PEK → CGQ May 1, 05:35 UTCMay 1, 05:45 UTC10m
2026-04-30 CCA1659 PEK → NDG Apr 30, 23:20 UTCApr 30, 23:35 UTC15m
2026-04-29 CCA1909 - Apr 29, 23:35 UTCApr 29, 23:55 UTC20m
2026-04-29 CCA1649 PEK → CGQ Apr 29, 05:30 UTCApr 29, 05:40 UTC10m
2026-04-28 CCA4132 PEK → CKG Apr 28, 04:10 UTCApr 28, 04:30 UTC20m
2026-04-27 CCA1395 TSN → CAN Apr 27, 10:40 UTCApr 27, 10:50 UTC10m
2026-04-27 CCA1361 PEK → HAK Apr 27, 01:00 UTCApr 27, 01:15 UTC15m
2026-04-26 CCA1627 PEK → CGQ Apr 26, 02:10 UTCApr 26, 02:20 UTC10m
2026-04-25 CCA1914 CGO → PEK Apr 25, 10:25 UTCApr 25, 10:35 UTC10m
2026-04-24 CCA1911 - Apr 24, 09:10 UTCApr 24, 09:25 UTC15m
2026-04-24 CCA1282 - Apr 24, 05:15 UTCApr 24, 05:35 UTC20m
2026-04-24 CCA1281 - Apr 24, 01:15 UTCApr 24, 01:40 UTC25m
2026-04-23 CCA1649 PEK → CGQ Apr 23, 05:20 UTCApr 23, 05:30 UTC10m

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-206T page for operator, model, and routing details .

Mode-S 781549 frequently asked

What is Mode-S code 781549?
781549 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-206T.
Where is Mode-S 781549 registered?
Mode-S code 781549 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781549 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781549, octal 36012511, decimal 7,869,769.
What flights does 781549 operate?
Mode-S 781549 has broadcast 20 distinct callsigns, including CCA1659, CCA1649, CCA1921, CCA1909, CCA1123.