Apparatus

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sensors Mode-S transponder

7817DE

ICAO 24-bit transponder address · allocated to China

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

Hex
7817DE
Octal
36013736
Decimal
7,870,430
Country
CN
Tail
B-20DQ
Type
B38M
No current signal · last broadcast Jul 26, 14:20 UTC
Flights observed
190
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 14:20 UTC

Last known position

Most recent position reported by Mode-S 7817DE.

Country allocation

The ICAO 24-bit address 7817DE 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
CCA107 Air China 13 2026-07-26
CCA980 Air China 12 2026-07-25
CCA979 Air China 12 2026-07-25
CCA108 - 9 2026-07-02
CCA713 Air China 6 2026-06-11
CCA1255 - 6 2026-06-29
CCA1453 - 5 2026-07-12
CCA1295 Air China 5 2026-06-09
CCA1256 - 5 2026-06-29
CCA1445 Air China 4 2026-06-13
CCA1251 Air China 4 2026-06-06
CCA1216 - 4 2026-07-17
CCA956 - 3 2026-07-14
CCA714 Air China 3 2026-06-11
CCA556 - 3 2026-07-23
CCA555 Air China 3 2026-07-23
CCA1902 Air China 3 2026-06-09
CCA1609 - 3 2026-07-13
CCA1446 Air China 3 2026-07-24
CCA1434 Air China 3 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CCA107 PEK → HKG Jul 26, 13:35 UTCJul 26, 14:10 UTC35m
2026-07-26 CCA107 PEK → HKG Jul 26, 11:00 UTCJul 26, 11:10 UTC10m
2026-07-26 CCA1434 KWE → PEK Jul 26, 08:25 UTCJul 26, 08:35 UTC10m
2026-07-26 CCA1433 PEK → KWE Jul 26, 01:45 UTCJul 26, 02:05 UTC20m
2026-07-25 CCA980 BKK → PEK Jul 25, 20:05 UTCJul 25, 20:25 UTC20m
2026-07-25 CCA980 BKK → PEK Jul 25, 18:45 UTCJul 25, 19:05 UTC20m
2026-07-25 CCA979 PEK → BKK Jul 25, 12:15 UTCJul 25, 16:35 UTC4h 20m
2026-07-25 CCA1272 LHW → PEK Jul 25, 09:05 UTCJul 25, 09:30 UTC25m
2026-07-25 CCA1271 PEK → LHW Jul 25, 04:05 UTCJul 25, 04:25 UTC20m
2026-07-24 CCA1446 KMG → PEK Jul 24, 02:45 UTCJul 24, 11:45 UTC9h 0m
2026-07-23 CCA9741 PEK → CKG Jul 23, 16:00 UTCJul 23, 16:20 UTC20m
2026-07-23 CCA556 - Jul 23, 10:40 UTCJul 23, 11:05 UTC25m
2026-07-23 CCA556 - Jul 23, 09:15 UTCJul 23, 09:35 UTC20m
2026-07-23 CCA555 PEK → BKK Jul 23, 05:50 UTCJul 23, 06:15 UTC25m
2026-07-23 CCA555 PEK → BKK Jul 23, 01:50 UTCJul 23, 05:00 UTC3h 10m
2026-07-22 CCA1209 PEK → XIY Jul 22, 02:30 UTCJul 22, 02:40 UTC10m
2026-07-21 CCA1246 HTN → PEK Jul 21, 15:55 UTCJul 21, 16:15 UTC20m
2026-07-21 - - Jul 21, 05:35 UTCJul 21, 05:50 UTC15m
2026-07-20 CCA9612 - Jul 20, 05:45 UTCJul 20, 06:05 UTC20m
2026-07-19 CCA9611 TFU → PKX Jul 19, 10:15 UTCJul 19, 10:35 UTC20m
2026-07-19 CCA1809 PEK → XMN Jul 19, 01:50 UTCJul 19, 02:00 UTC10m
2026-07-18 CCA980 - Jul 18, 20:35 UTCJul 18, 20:50 UTC15m
2026-07-18 CCA980 - Jul 18, 19:10 UTCJul 18, 19:25 UTC15m
2026-07-18 CCA979 - Jul 18, 17:30 UTCJul 18, 17:40 UTC10m
2026-07-18 CCA979 - Jul 18, 13:20 UTCJul 18, 16:25 UTC3h 5m
2026-07-18 CCA1438 - Jul 18, 11:05 UTCJul 18, 11:25 UTC20m
2026-07-18 CCA4132 - Jul 18, 05:40 UTCJul 18, 05:50 UTC10m
2026-07-18 CCA1350 CSX → PEK Jul 18, 02:40 UTCJul 18, 02:50 UTC11m
2026-07-17 CCA1349 PEK → CSX Jul 17, 12:30 UTCJul 17, 12:40 UTC10m
2026-07-17 CCA1216 - Jul 17, 09:35 UTCJul 17, 09:45 UTC10m
2026-07-16 CCA1215 - Jul 16, 22:45 UTCJul 16, 22:55 UTC10m
2026-07-16 CCA1250 - Jul 16, 17:20 UTCJul 16, 17:35 UTC15m
2026-07-15 CCA1240 - Jul 15, 15:55 UTCJul 15, 16:10 UTC15m
2026-07-15 CCA1239 - Jul 15, 01:45 UTCJul 15, 02:05 UTC20m
2026-07-14 CCA980 - Jul 14, 20:00 UTCJul 14, 20:15 UTC15m
2026-07-14 CCA980 - Jul 14, 18:40 UTCJul 14, 18:55 UTC15m
2026-07-14 CCA979 - Jul 14, 16:45 UTCJul 14, 16:55 UTC10m
2026-07-14 CCA979 - Jul 14, 12:35 UTCJul 14, 15:40 UTC3h 5m
2026-07-14 CCA956 - Jul 14, 10:10 UTCJul 14, 10:30 UTC20m
2026-07-13 CCA1609 - Jul 13, 23:35 UTCJul 13, 23:45 UTC10m
2026-07-13 CCA1250 - Jul 13, 16:50 UTCJul 13, 17:05 UTC15m
2026-07-12 CCA1453 - Jul 12, 23:35 UTCJul 12, 23:55 UTC20m
2026-07-12 CCA1439 - Jul 12, 06:15 UTCJul 12, 06:35 UTC20m
2026-07-11 CCA1434 - Jul 11, 08:35 UTCJul 11, 08:45 UTC10m
2026-07-11 CCA1433 - Jul 11, 01:50 UTCJul 11, 02:10 UTC20m
2026-07-10 CCA1647 - Jul 10, 12:35 UTCJul 10, 13:00 UTC25m
2026-07-10 CCA1258 - Jul 10, 09:45 UTCJul 10, 09:55 UTC10m
2026-07-10 CCA1257 - Jul 10, 00:40 UTCJul 10, 00:55 UTC15m
2026-07-09 CCA1246 - Jul 9, 15:55 UTCJul 9, 16:15 UTC20m
2026-07-09 CCA4137 - Jul 9, 03:05 UTCJul 9, 03:20 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-20DQ page for operator, model, and routing details .

Mode-S 7817DE frequently asked

What is Mode-S code 7817DE?
7817DE is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20DQ.
Where is Mode-S 7817DE registered?
Mode-S code 7817DE is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7817DE broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 14:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7817DE, octal 36013736, decimal 7,870,430.
What flights does 7817DE operate?
Mode-S 7817DE has broadcast 20 distinct callsigns, including CCA107, CCA980, CCA979, CCA108, CCA713.