Apparatus

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sensors Mode-S transponder

7817FB

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20DT · BOEING 787-9 Dreamliner

Hex
7817FB
Octal
36013773
Decimal
7,870,459
Country
CN
Tail
B-20DT
Type
B789
No current signal · last broadcast 17h ago
Flights observed
201
Distinct callsigns
20
Country
CN
Last broadcast
17h ago

Last known position

Most recent position reported by Mode-S 7817FB.

Country allocation

The ICAO 24-bit address 7817FB 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
DKH1607 - 19 2026-07-12
DKH1662 - 15 2026-07-08
DKH1661 - 15 2026-07-07
DKH1658 - 14 2026-06-28
DKH1667 - 11 2026-07-13
DKH1602 - 10 2026-06-25
DKH1601 - 10 2026-06-25
DKH1657 - 8 2026-06-27
DKH1883 - 7 2026-07-01
DKH1789 - 7 2026-06-29
DKH1608 - 7 2026-06-18
DKH1885 Juneyao Airlines 6 2026-06-01
DKH1882 - 6 2026-06-30
DKH1790 - 6 2026-06-29
DKH1670 - 6 2026-07-11
DKH1669 - 6 2026-07-10
DKH1668 - 6 2026-07-13
DKH1886 Juneyao Airlines 5 2026-05-28
DKH1881 - 5 2026-06-30
DKH1659 - 5 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 DKH1668 - Jul 13, 20:50 UTCJul 14, 00:20 UTC3h 30m
2026-07-13 DKH1667 - Jul 13, 11:00 UTCJul 13, 17:55 UTC6h 55m
2026-07-12 DKH1667 - Jul 12, 20:50 UTCJul 13, 17:55 UTC21h 5m
2026-07-12 DKH1667 - Jul 12, 18:50 UTCJul 13, 17:55 UTC23h 5m
2026-07-12 DKH1667 - Jul 12, 16:50 UTCJul 13, 16:45 UTC23h 55m
2026-07-12 DKH1607 - Jul 12, 06:25 UTCJul 12, 13:55 UTC7h 30m
2026-07-11 DKH1670 - Jul 11, 07:35 UTCJul 12, 06:40 UTC23h 5m
2026-07-10 DKH1670 - Jul 10, 22:40 UTCJul 11, 07:50 UTC9h 10m
2026-07-10 DKH1669 NRT → SYD Jul 10, 04:50 UTCJul 10, 20:25 UTC15h 35m
2026-07-09 DKH1386 HND → NRT Jul 9, 15:30 UTCJul 10, 03:30 UTC12h 0m
2026-07-09 DKH1385 - Jul 9, 12:10 UTCJul 9, 13:45 UTC1h 35m
2026-07-08 DKH1385 - Jul 8, 16:50 UTCJul 9, 13:45 UTC20h 55m
2026-07-08 DKH1385 - Jul 8, 16:10 UTCJul 9, 13:45 UTC21h 35m
2026-07-08 DKH1662 - Jul 8, 12:50 UTCJul 9, 12:45 UTC23h 55m
2026-07-08 DKH1662 - Jul 8, 10:20 UTCJul 8, 16:50 UTC6h 30m
2026-07-07 DKH1661 KIX → MAN Jul 7, 14:00 UTCJul 8, 05:30 UTC15h 30m
2026-07-06 DKH1670 SYD → KIX Jul 6, 22:50 UTCJul 7, 12:40 UTC13h 50m
2026-07-06 DKH1669 NRT → SYD Jul 6, 04:35 UTCJul 6, 20:25 UTC15h 50m
2026-07-05 DKH1660 - Jul 5, 11:00 UTCJul 6, 02:55 UTC15h 55m
2026-07-04 DKH1659 - Jul 4, 10:55 UTCJul 5, 05:40 UTC18h 45m
2026-07-04 DKH1659 - Jul 4, 08:50 UTCJul 5, 05:40 UTC20h 50m
2026-07-04 DKH1659 - Jul 4, 08:40 UTCJul 5, 05:40 UTC21h 0m
2026-07-04 DKH1670 - Jul 4, 01:50 UTCJul 4, 20:30 UTC18h 40m
2026-07-03 DKH1669 - Jul 3, 04:50 UTCJul 3, 23:30 UTC18h 40m
2026-07-03 DKH1669 NRT → SYD Jul 3, 04:35 UTCJul 3, 23:30 UTC18h 55m
2026-07-03 DKH1379 - Jul 3, 01:25 UTCJul 3, 02:50 UTC1h 25m
2026-07-01 DKH1884 - Jul 1, 06:50 UTCJul 1, 07:00 UTC10m
2026-07-01 DKH1883 - Jul 1, 04:35 UTCJul 1, 04:55 UTC20m
2026-06-30 DKH1882 - Jun 30, 03:50 UTCJun 30, 04:00 UTC10m
2026-06-30 DKH1881 - Jun 30, 01:50 UTCJun 30, 02:10 UTC20m
2026-06-29 DKH1790 - Jun 29, 13:19 UTCJun 29, 13:30 UTC10m
2026-06-29 DKH1789 - Jun 29, 10:44 UTCJun 29, 11:10 UTC25m
2026-06-28 DKH1658 - Jun 28, 14:50 UTCJun 29, 10:04 UTC19h 15m
2026-06-28 DKH1658 - Jun 28, 12:50 UTCJun 29, 10:04 UTC21h 15m
2026-06-28 DKH1658 - Jun 28, 12:39 UTCJun 28, 14:54 UTC2h 15m
2026-06-27 DKH1657 - Jun 27, 22:40 UTCJun 28, 04:55 UTC6h 15m
2026-06-27 DKH1668 - Jun 27, 00:50 UTCJun 27, 22:45 UTC21h 55m
2026-06-26 DKH1668 - Jun 26, 22:49 UTCJun 27, 22:45 UTC23h 55m
2026-06-26 DKH1668 - Jun 26, 21:15 UTCJun 27, 00:55 UTC3h 40m
2026-06-26 DKH1667 - Jun 26, 10:55 UTCJun 26, 17:50 UTC6h 55m
2026-06-25 DKH1602 - Jun 25, 08:34 UTCJun 25, 12:25 UTC3h 50m
2026-06-25 DKH1601 - Jun 25, 02:35 UTCJun 25, 06:30 UTC3h 55m
2026-06-24 DKH1601 - Jun 24, 09:49 UTCJun 25, 06:30 UTC20h 40m
2026-06-23 DKH1658 - Jun 23, 12:49 UTCJun 24, 07:24 UTC18h 35m
2026-06-23 DKH1658 - Jun 23, 12:20 UTCJun 24, 07:24 UTC19h 5m
2026-06-23 DKH1657 - Jun 23, 03:29 UTCJun 23, 04:35 UTC1h 5m
2026-06-22 DKH1111 - Jun 22, 11:19 UTCJun 22, 11:30 UTC10m
2026-06-22 - - Jun 22, 06:15 UTCJun 22, 06:25 UTC10m
2026-06-21 DKH1658 - Jun 21, 12:44 UTCJun 21, 14:59 UTC2h 15m
2026-06-20 DKH1657 - Jun 20, 22:30 UTCJun 21, 04:44 UTC6h 15m

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-20DT page for operator, model, and routing details .

Mode-S 7817FB frequently asked

What is Mode-S code 7817FB?
7817FB is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20DT.
Where is Mode-S 7817FB registered?
Mode-S code 7817FB is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7817FB broadcasting right now?
No active broadcast right now. Last signal was 17h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7817FB, octal 36013773, decimal 7,870,459.
What flights does 7817FB operate?
Mode-S 7817FB has broadcast 20 distinct callsigns, including DKH1607, DKH1662, DKH1661, DKH1658, DKH1667.