sensors Mode-S transponder

781BDB

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-220Y · BOEING 737-800

Hex
781BDB
Octal
36015733
Decimal
7,871,451
Country
CN
Tail
B-220Y
Type
B738
No current signal · last broadcast 2h ago
Flights observed
35
Distinct callsigns
15
Country
CN
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 781BDB.

Country allocation

The ICAO 24-bit address 781BDB 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 15 distinct

Callsign Airline Flights Last seen
JYH1207 9 Air 6 2026-05-14
JYH1208 9 Air 5 2026-05-14
JYH1212 9 Air 4 2026-05-20
JYH1211 9 Air 4 2026-05-17
JYH1233 9 Air 3 2026-05-13
JYH1231 9 Air 3 2026-05-04
JYH1234 9 Air 2 2026-05-06
JYH1343 - 1 2026-04-14
JYH1298 9 Air 1 2026-05-22
JYH1278 9 Air 1 2026-04-20
JYH1277 9 Air 1 2026-04-17
JYH1232 9 Air 1 2026-05-18
JYH1218 9 Air 1 2026-05-16
JYH1217 9 Air 1 2026-05-16
JYH1041 9 Air 1 2026-06-02

Recent flights last 35

DateFlightRouteTakeoffLandingDuration
2026-06-02 JYH1041 CAN → JHG Jun 2, 23:05 UTCJun 2, 23:45 UTC40m
2026-05-22 JYH1298 PEN → HAK May 22, 19:55 UTCMay 23, 00:40 UTC4h 45m
2026-05-20 JYH1212 KUL → KWE May 20, 11:45 UTCMay 20, 12:00 UTC15m
2026-05-18 JYH1232 VTE → NGB May 18, 10:25 UTCMay 18, 10:35 UTC10m
2026-05-17 JYH1212 KUL → KWE May 17, 11:35 UTCMay 17, 11:45 UTC10m
2026-05-17 JYH1211 KWE → KUL May 17, 09:45 UTCMay 17, 10:05 UTC20m
2026-05-16 JYH1218 BKI → KWE May 16, 11:25 UTCMay 16, 14:01 UTC2h 35m
2026-05-16 JYH1217 KWE → BKI May 16, 07:20 UTCMay 16, 10:16 UTC2h 55m
2026-05-14 JYH1208 BKK → KWE May 14, 12:05 UTCMay 14, 12:55 UTC50m
2026-05-14 JYH1207 KWE → BKK May 14, 09:55 UTCMay 14, 10:55 UTC1h 0m
2026-05-13 JYH1233 WUX → VTE May 13, 05:15 UTCMay 13, 10:25 UTC5h 10m
2026-05-12 JYH1208 BKK → KWE May 12, 11:50 UTCMay 13, 10:25 UTC22h 35m
2026-05-12 JYH1207 KWE → BKK May 12, 09:45 UTCMay 12, 10:40 UTC55m
2026-05-10 JYH1212 KUL → KWE May 10, 11:50 UTCMay 10, 12:05 UTC15m
2026-05-10 JYH1211 KWE → KUL May 10, 10:05 UTCMay 10, 10:24 UTC20m
2026-05-06 JYH1234 VTE → WUX May 6, 09:40 UTCMay 6, 10:05 UTC25m
2026-05-06 JYH1233 WUX → VTE May 6, 05:00 UTCMay 6, 05:20 UTC19m
2026-05-04 JYH1231 NGB → VTE May 4, 04:29 UTCMay 4, 10:20 UTC5h 50m
2026-05-02 JYH1208 BKK → KWE May 2, 11:55 UTCMay 2, 12:25 UTC30m
2026-05-02 JYH1207 KWE → BKK May 2, 09:20 UTCMay 2, 10:25 UTC1h 5m
2026-05-01 JYH1212 KUL → KWE May 1, 13:15 UTCMay 1, 13:35 UTC20m
2026-05-01 JYH1211 KWE → KUL May 1, 09:55 UTCMay 1, 11:05 UTC1h 10m
2026-04-28 JYH1208 BKK → KWE Apr 28, 11:40 UTCApr 28, 12:05 UTC25m
2026-04-28 JYH1207 KWE → BKK Apr 28, 09:45 UTCApr 28, 10:15 UTC30m
2026-04-25 JYH1231 NGB → VTE Apr 25, 05:15 UTCApr 25, 10:40 UTC5h 25m
2026-04-24 JYH1231 NGB → VTE Apr 24, 10:15 UTCApr 25, 05:45 UTC19h 30m
2026-04-23 JYH1208 BKK → KWE Apr 23, 11:50 UTCApr 24, 05:50 UTC18h 0m
2026-04-23 JYH1207 KWE → BKK Apr 23, 09:35 UTCApr 23, 10:30 UTC55m
2026-04-22 JYH1207 KWE → BKK Apr 22, 11:45 UTCApr 23, 10:30 UTC22h 45m
2026-04-22 JYH1211 KWE → KUL Apr 22, 10:10 UTCApr 22, 10:25 UTC15m
2026-04-20 JYH1278 VTE → CAN Apr 20, 16:45 UTCApr 20, 17:00 UTC15m
2026-04-17 JYH1277 CAN → VTE Apr 17, 13:50 UTCApr 17, 14:00 UTC10m
2026-04-15 JYH1234 VTE → WUX Apr 15, 10:05 UTCApr 15, 10:25 UTC20m
2026-04-15 JYH1233 WUX → VTE Apr 15, 05:25 UTCApr 15, 05:55 UTC30m
2026-04-14 JYH1343 - Apr 14, 05:15 UTCApr 14, 05:30 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-220Y page for operator, model, and routing details .

Mode-S 781BDB frequently asked

What is Mode-S code 781BDB?
781BDB is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-220Y.
Where is Mode-S 781BDB registered?
Mode-S code 781BDB is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781BDB broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781BDB, octal 36015733, decimal 7,871,451.
What flights does 781BDB operate?
Mode-S 781BDB has broadcast 15 distinct callsigns, including JYH1207, JYH1208, JYH1212, JYH1211, JYH1233.