Apparatus

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sensors Mode-S transponder

78105A

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-1539 · BOEING 787-9 Dreamliner

Hex
78105A
Octal
36010132
Decimal
7,868,506
Country
CN
Tail
B-1539
Type
B789
No current signal · last broadcast Jul 26, 17:45 UTC
Flights observed
200
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 17:45 UTC

Last known position

Most recent position reported by Mode-S 78105A.

Country allocation

The ICAO 24-bit address 78105A 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
CHH7925 Hainan Airlines 46 2026-07-19
CHH7926 Hainan Airlines 38 2026-07-19
CHH492 - 14 2026-07-15
CHH491 - 12 2026-07-14
CHH7707 - 7 2026-07-14
CHH489 Hainan Airlines 5 2026-05-10
CHH798 - 4 2026-07-22
CHH7713 - 4 2026-06-28
CHH445 Hainan Airlines 4 2026-07-23
CHH7852 Hainan Airlines 3 2026-07-26
CHH7712 - 3 2026-07-14
CHH7701 Hainan Airlines 3 2026-07-21
CHH495 - 3 2026-07-11
CHH490 Hainan Airlines 3 2026-05-10
CHH472 Hainan Airlines 3 2026-05-12
CHH7974 Hainan Airlines 2 2026-06-15
CHH7973 - 2 2026-06-14
CHH7851 - 2 2026-06-28
CHH7716 Hainan Airlines 2 2026-05-31
CHH7709 Hainan Airlines 2 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CHH7852 URC → SZX Jul 26, 17:35 UTCJul 26, 17:45 UTC10m
2026-07-25 CHH7025 HAK → SZX Jul 25, 10:30 UTCJul 25, 11:00 UTC30m
2026-07-23 CHH446 SEA → CKG Jul 23, 19:50 UTCJul 24, 07:00 UTC11h 10m
2026-07-23 CHH445 CKG → SEA Jul 23, 07:50 UTCJul 23, 17:40 UTC9h 50m
2026-07-22 CHH445 CKG → SEA Jul 22, 18:35 UTCJul 23, 17:40 UTC23h 5m
2026-07-22 CHH445 CKG → SEA Jul 22, 18:05 UTCJul 23, 16:10 UTC22h 5m
2026-07-22 CHH445 CKG → SEA Jul 22, 12:35 UTCJul 23, 09:40 UTC21h 5m
2026-07-22 CHH798 - Jul 22, 11:40 UTCJul 23, 09:40 UTC22h 0m
2026-07-22 CHH798 - Jul 22, 10:20 UTCJul 23, 08:30 UTC22h 10m
2026-07-22 CHH798 - Jul 22, 02:20 UTCJul 22, 18:55 UTC16h 35m
2026-07-21 CHH798 - Jul 21, 20:35 UTCJul 22, 18:55 UTC22h 20m
2026-07-21 CHH797 HAK → SYD Jul 21, 19:45 UTCJul 22, 18:30 UTC22h 45m
2026-07-21 CHH7024 - Jul 21, 06:30 UTCJul 21, 06:40 UTC10m
2026-07-21 CHH7701 PEK → SZX Jul 21, 00:50 UTCJul 21, 01:10 UTC20m
2026-07-20 CHH7267 - Jul 20, 12:15 UTCJul 20, 12:40 UTC25m
2026-07-19 CHH7926 TIJ → PEK Jul 19, 16:20 UTCJul 19, 21:50 UTC5h 30m
2026-07-19 CHH7926 TIJ → PEK Jul 19, 11:10 UTCJul 19, 13:55 UTC2h 45m
2026-07-19 CHH7925 PEK → TIJ Jul 19, 07:50 UTCJul 19, 07:55 UTC5m
2026-07-19 CHH7925 PEK → TIJ Jul 19, 05:10 UTCJul 19, 06:10 UTC1h 0m
2026-07-18 CHH7925 PEK → TIJ Jul 18, 18:30 UTCJul 19, 00:20 UTC5h 50m
2026-07-17 CHH7926 TIJ → PEK Jul 17, 16:24 UTCJul 17, 22:00 UTC5h 35m
2026-07-17 CHH7926 - Jul 17, 11:10 UTCJul 17, 14:00 UTC2h 50m
2026-07-17 CHH7925 - Jul 17, 07:14 UTCJul 17, 07:25 UTC10m
2026-07-17 CHH7925 - Jul 17, 04:39 UTCJul 17, 05:45 UTC1h 5m
2026-07-16 CHH7925 - Jul 16, 18:34 UTCJul 17, 00:20 UTC5h 45m
2026-07-16 CHH6213 - Jul 16, 02:05 UTCJul 16, 02:15 UTC10m
2026-07-15 CHH492 - Jul 15, 20:30 UTCJul 15, 20:50 UTC20m
2026-07-15 CHH492 - Jul 15, 11:45 UTCJul 15, 18:10 UTC6h 25m
2026-07-14 CHH491 - Jul 14, 19:10 UTCJul 15, 04:40 UTC9h 29m
2026-07-14 CHH7712 - Jul 14, 10:35 UTCJul 14, 10:45 UTC10m
2026-07-14 CHH7707 - Jul 14, 08:05 UTCJul 14, 08:20 UTC15m
2026-07-14 CHH7707 - Jul 14, 05:45 UTCJul 14, 06:05 UTC20m
2026-07-13 CHH7926 - Jul 13, 13:30 UTCJul 13, 19:15 UTC5h 45m
2026-07-13 CHH7926 - Jul 13, 08:45 UTCJul 13, 11:25 UTC2h 40m
2026-07-13 CHH7925 - Jul 13, 06:55 UTCJul 13, 07:10 UTC15m
2026-07-13 CHH7925 - Jul 13, 04:10 UTCJul 13, 05:15 UTC1h 5m
2026-07-12 CHH7925 - Jul 12, 18:25 UTCJul 13, 00:25 UTC6h 0m
2026-07-11 CHH496 - Jul 11, 18:25 UTCJul 12, 05:05 UTC10h 40m
2026-07-11 CHH495 - Jul 11, 06:30 UTCJul 11, 16:00 UTC9h 30m
2026-07-10 CHH492 - Jul 10, 11:40 UTCJul 10, 17:45 UTC6h 5m
2026-07-09 CHH491 - Jul 9, 19:30 UTCJul 10, 05:05 UTC9h 35m
2026-07-09 CHH7712 - Jul 9, 12:05 UTCJul 9, 12:20 UTC15m
2026-07-09 CHH7707 - Jul 9, 10:10 UTCJul 9, 10:20 UTC10m
2026-07-09 CHH7707 - Jul 9, 07:55 UTCJul 9, 08:10 UTC15m
2026-07-08 CHH7926 - Jul 8, 14:15 UTCJul 8, 20:15 UTC6h 0m
2026-07-08 CHH7926 - Jul 8, 09:20 UTCJul 8, 12:15 UTC2h 55m
2026-07-08 CHH7925 - Jul 8, 07:30 UTCJul 8, 07:35 UTC5m
2026-07-08 CHH7925 - Jul 8, 04:45 UTCJul 8, 05:55 UTC1h 10m
2026-07-07 CHH7925 - Jul 7, 19:30 UTCJul 8, 01:20 UTC5h 50m
2026-07-06 CHH7926 - Jul 6, 14:35 UTCJul 6, 20:15 UTC5h 40m

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-1539 page for operator, model, and routing details .

Mode-S 78105A frequently asked

What is Mode-S code 78105A?
78105A is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-1539.
Where is Mode-S 78105A registered?
Mode-S code 78105A is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 78105A broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 17:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 78105A, octal 36010132, decimal 7,868,506.
What flights does 78105A operate?
Mode-S 78105A has broadcast 20 distinct callsigns, including CHH7925, CHH7926, CHH492, CHH491, CHH7707.