Apparatus

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sensors Mode-S transponder

7817DF

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20DR · BOEING 737 MAX 8

Hex
7817DF
Octal
36013737
Decimal
7,870,431
Country
CN
Tail
B-20DR
Type
B38M
No current signal · last broadcast Jul 26, 14:10 UTC
Flights observed
199
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 14:10 UTC

Last known position

Most recent position reported by Mode-S 7817DF.

Country allocation

The ICAO 24-bit address 7817DF 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
CCA117 Air China 10 2026-07-22
CCA979 - 9 2026-06-17
CCA980 - 8 2026-06-17
CCA960 - 7 2026-07-12
CCA959 - 7 2026-07-12
CCA118 Air China 7 2026-07-23
CCA107 - 7 2026-07-17
CCA1250 Air China 5 2026-07-24
CCA1215 - 5 2026-07-12
CCA108 Air China 5 2026-07-18
CCA1349 - 4 2026-07-13
CCA1249 - 4 2026-07-06
CCA1207 - 4 2026-06-29
CCA956 Air China 3 2026-06-05
CCA955 Air China 3 2026-06-12
CCA1933 Air China 3 2026-07-19
CCA1447 - 3 2026-07-11
CCA1446 Air China 3 2026-06-03
CCA1445 Air China 3 2026-06-03
CCA1296 - 3 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CCA1222 LHW → PEK Jul 26, 13:50 UTCJul 26, 14:10 UTC20m
2026-07-26 CCA1221 PEK → LHW Jul 26, 08:55 UTCJul 26, 09:20 UTC25m
2026-07-26 CCA1492 WMT → PEK Jul 26, 06:40 UTCJul 26, 06:50 UTC10m
2026-07-26 CCA1491 PEK → WMT Jul 26, 00:20 UTCJul 26, 00:40 UTC20m
2026-07-25 CCA1635 PEK → SHE Jul 25, 11:25 UTCJul 25, 11:35 UTC10m
2026-07-24 CCA1250 KHG → PEK Jul 24, 16:25 UTCJul 24, 16:50 UTC25m
2026-07-23 CCA1246 HTN → PEK Jul 23, 15:55 UTCJul 23, 16:20 UTC25m
2026-07-23 CCA1245 - Jul 23, 05:25 UTCJul 23, 05:35 UTC10m
2026-07-23 CCA118 HKG → PEK Jul 23, 00:50 UTCJul 23, 01:05 UTC15m
2026-07-22 CCA117 PEK → HKG Jul 22, 00:15 UTCJul 22, 13:10 UTC12h 55m
2026-07-21 CCA556 - Jul 21, 08:20 UTCJul 21, 10:10 UTC1h 50m
2026-07-21 CCA555 - Jul 21, 01:40 UTCJul 21, 06:15 UTC4h 35m
2026-07-20 CCA906 RGN → PEK Jul 20, 16:25 UTCJul 20, 20:35 UTC4h 10m
2026-07-20 CCA905 PEK → RGN Jul 20, 08:40 UTCJul 20, 15:15 UTC6h 35m
2026-07-19 CCA1231 - Jul 19, 23:40 UTCJul 20, 00:00 UTC20m
2026-07-19 CCA1933 PEK → NNG Jul 19, 07:45 UTCJul 19, 08:00 UTC15m
2026-07-19 CCA1238 - Jul 19, 05:15 UTCJul 19, 05:30 UTC15m
2026-07-18 CCA1237 - Jul 18, 22:30 UTCJul 18, 22:50 UTC20m
2026-07-18 CCA1256 - Jul 18, 18:05 UTCJul 18, 18:20 UTC15m
2026-07-18 CCA108 HKG → PEK Jul 18, 03:20 UTCJul 18, 03:40 UTC20m
2026-07-17 CCA107 - Jul 17, 13:15 UTCJul 17, 13:50 UTC35m
2026-07-17 CCA107 - Jul 17, 10:55 UTCJul 17, 11:04 UTC10m
2026-07-16 CCA9741 - Jul 16, 14:55 UTCJul 16, 15:19 UTC25m
2026-07-16 CCA724 - Jul 16, 12:00 UTCJul 16, 12:25 UTC25m
2026-07-16 CCA723 - Jul 16, 07:40 UTCJul 16, 07:55 UTC15m
2026-07-16 CCA902 - Jul 16, 05:30 UTCJul 16, 05:45 UTC15m
2026-07-16 CCA901 - Jul 16, 01:00 UTCJul 16, 01:10 UTC10m
2026-07-15 CCA1325 - Jul 15, 10:00 UTCJul 15, 10:15 UTC15m
2026-07-15 CCA1462 - Jul 15, 06:10 UTCJul 15, 06:20 UTC10m
2026-07-14 CCA1461 - Jul 14, 23:20 UTCJul 14, 23:40 UTC20m
2026-07-14 CCA1246 - Jul 14, 16:20 UTCJul 14, 16:40 UTC20m
2026-07-13 CCA1349 - Jul 13, 12:10 UTCJul 13, 12:30 UTC20m
2026-07-13 CCA1216 - Jul 13, 09:40 UTCJul 13, 10:00 UTC20m
2026-07-12 CCA1215 - Jul 12, 23:10 UTCJul 12, 23:20 UTC10m
2026-07-12 CCA960 - Jul 12, 14:05 UTCJul 12, 14:20 UTC15m
2026-07-12 CCA960 - Jul 12, 12:45 UTCJul 12, 13:01 UTC15m
2026-07-12 CCA959 - Jul 12, 10:30 UTCJul 12, 10:50 UTC20m
2026-07-12 CCA959 - Jul 12, 06:30 UTCJul 12, 09:35 UTC3h 5m
2026-07-12 CCA9614 - Jul 12, 03:40 UTCJul 12, 03:55 UTC15m
2026-07-11 CCA9613 - Jul 11, 22:55 UTCJul 11, 23:20 UTC25m
2026-07-11 CCA1448 - Jul 11, 19:00 UTCJul 11, 19:15 UTC15m
2026-07-11 CCA1447 - Jul 11, 11:55 UTCJul 11, 12:10 UTC15m
2026-07-10 CCA1224 - Jul 10, 09:10 UTCJul 10, 09:40 UTC30m
2026-07-10 CCA1223 - Jul 10, 05:05 UTCJul 10, 05:25 UTC20m
2026-07-09 CCA1258 - Jul 9, 08:25 UTCJul 9, 08:40 UTC15m
2026-07-08 CCA1257 - Jul 8, 23:55 UTCJul 9, 00:05 UTC10m
2026-07-08 CCA1447 - Jul 8, 10:40 UTCJul 8, 10:50 UTC10m
2026-07-08 CCA1809 - Jul 8, 02:15 UTCJul 8, 02:30 UTC15m
2026-07-07 CCA960 - Jul 7, 19:35 UTCJul 7, 21:10 UTC1h 35m
2026-07-07 CCA959 - Jul 7, 17:40 UTCJul 7, 18:10 UTC30m

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

Mode-S 7817DF frequently asked

What is Mode-S code 7817DF?
7817DF is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20DR.
Where is Mode-S 7817DF registered?
Mode-S code 7817DF is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7817DF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 14:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7817DF, octal 36013737, decimal 7,870,431.
What flights does 7817DF operate?
Mode-S 7817DF has broadcast 20 distinct callsigns, including CCA117, CCA979, CCA980, CCA960, CCA959.