Apparatus

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sensors Mode-S transponder

71C704

ICAO 24-bit transponder address · allocated to Korea, South

Currently assigned to HL8704 · BOEING 787-9 Dreamliner

Hex
71C704
Octal
34343404
Decimal
7,456,516
Country
KR
Tail
HL8704
Type
B789
No current signal · last broadcast 1h ago
Flights observed
177
Distinct callsigns
20
Country
KR
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 71C704.

Country allocation

The ICAO 24-bit address 71C704 falls within the block assigned to Korea, South (KR) by ICAO Annex 10, Volume III. Every aircraft registered in Korea, South 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
APZ801 - 35 2026-07-01
APZ802 - 25 2026-07-01
APZ152 - 15 2026-07-09
APZ151 - 14 2026-07-08
APZ104 - 13 2026-07-14
APZ103 - 13 2026-07-13
APZ111 - 9 2026-07-10
APZ112 - 8 2026-07-11
APZ736 - 5 2026-06-26
APZ735 - 5 2026-06-26
APZ731 - 5 2026-07-13
APZ132 - 5 2026-07-07
APZ131 Air Premiea 5 2026-07-06
APZ732 - 4 2026-07-13
APZ601 - 4 2026-04-14
APZ602 - 3 2026-04-14
APZ136 Air Premiea 2 2026-05-15
APZ135 Air Premiea 2 2026-05-15
APZ734 - 1 2026-04-14
APZ622 - 1 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 APZ104 - Jul 14, 06:50 UTCJul 14, 18:30 UTC11h 40m
2026-07-13 APZ103 - Jul 13, 13:25 UTCJul 14, 00:40 UTC11h 15m
2026-07-13 APZ732 NRT → ICN Jul 13, 03:50 UTCJul 13, 05:45 UTC1h 55m
2026-07-13 APZ731 - Jul 13, 00:10 UTCJul 13, 02:05 UTC1h 55m
2026-07-12 APZ622 - Jul 12, 09:10 UTCJul 12, 20:01 UTC10h 50m
2026-07-12 APZ732 NRT → ICN Jul 12, 04:01 UTCJul 12, 05:55 UTC1h 55m
2026-07-12 APZ731 ICN → NRT Jul 12, 00:15 UTCJul 12, 02:05 UTC1h 50m
2026-07-11 APZ112 - Jul 11, 00:20 UTCJul 11, 11:45 UTC11h 25m
2026-07-10 APZ111 ICN → SFO Jul 10, 10:35 UTCJul 10, 21:45 UTC11h 11m
2026-07-09 APZ152 - Jul 9, 00:45 UTCJul 9, 10:10 UTC9h 25m
2026-07-08 APZ151 - Jul 8, 13:50 UTCJul 8, 22:00 UTC8h 10m
2026-07-08 APZ732 - Jul 8, 03:55 UTCJul 8, 05:50 UTC1h 55m
2026-07-08 APZ731 ICN → NRT Jul 8, 00:15 UTCJul 8, 02:05 UTC1h 50m
2026-07-07 APZ132 EWR → ICN Jul 7, 05:25 UTCJul 7, 19:25 UTC14h 0m
2026-07-06 APZ131 ICN → EWR Jul 6, 12:55 UTCJul 7, 02:20 UTC13h 25m
2026-07-05 APZ621 ICN → ICN Jul 5, 09:15 UTCJul 5, 20:05 UTC10h 50m
2026-07-03 APZ112 SFO → ICN Jul 3, 22:55 UTCJul 4, 10:35 UTC11h 40m
2026-07-03 APZ111 - Jul 3, 09:15 UTCJul 3, 19:15 UTC10h 0m
2026-07-03 APZ732 NRT → ICN Jul 3, 03:50 UTCJul 3, 05:55 UTC2h 5m
2026-07-03 APZ731 - Jul 3, 00:05 UTCJul 3, 02:00 UTC1h 55m
2026-07-02 APZ152 - Jul 2, 00:35 UTCJul 2, 10:05 UTC9h 30m
2026-07-01 APZ151 - Jul 1, 21:50 UTCJul 1, 22:00 UTC10m
2026-07-01 APZ151 - Jul 1, 13:55 UTCJul 1, 15:35 UTC1h 40m
2026-07-01 APZ802 - Jul 1, 06:05 UTCJul 1, 09:10 UTC3h 5m
2026-07-01 APZ801 - Jul 1, 03:30 UTCJul 1, 04:00 UTC30m
2026-07-01 APZ801 - Jul 1, 00:50 UTCJul 1, 02:55 UTC2h 5m
2026-06-30 APZ132 EWR → ICN Jun 30, 05:25 UTCJun 30, 19:45 UTC14h 20m
2026-06-29 APZ131 ICN → EWR Jun 29, 12:49 UTCJun 30, 02:05 UTC13h 16m
2026-06-29 APZ802 - Jun 29, 06:44 UTCJun 29, 09:10 UTC2h 25m
2026-06-29 APZ802 - Jun 29, 05:54 UTCJun 29, 06:14 UTC20m
2026-06-29 APZ801 - Jun 29, 03:20 UTCJun 29, 03:29 UTC10m
2026-06-29 APZ801 - Jun 29, 00:34 UTCJun 29, 02:45 UTC2h 10m
2026-06-28 APZ802 HKG → ICN Jun 28, 06:55 UTCJun 28, 09:55 UTC3h 0m
2026-06-28 APZ801 - Jun 28, 03:35 UTCJun 28, 03:50 UTC15m
2026-06-28 APZ801 - Jun 28, 00:45 UTCJun 28, 02:54 UTC2h 10m
2026-06-27 APZ152 - Jun 27, 01:09 UTCJun 27, 10:40 UTC9h 30m
2026-06-26 APZ151 - Jun 26, 13:34 UTCJun 26, 21:24 UTC7h 50m
2026-06-26 APZ736 - Jun 26, 09:35 UTCJun 26, 11:34 UTC2h 0m
2026-06-26 APZ735 - Jun 26, 05:24 UTCJun 26, 07:30 UTC2h 5m
2026-06-25 APZ152 - Jun 25, 07:45 UTCJun 25, 10:15 UTC2h 30m
2026-06-25 APZ152 - Jun 25, 00:44 UTCJun 25, 00:55 UTC10m
2026-06-24 APZ151 - Jun 24, 13:50 UTCJun 24, 15:24 UTC1h 35m
2026-06-23 APZ104 LAX → ICN Jun 23, 06:44 UTCJun 23, 18:39 UTC11h 55m
2026-06-22 APZ103 - Jun 22, 13:25 UTCJun 22, 23:39 UTC10h 15m
2026-06-19 APZ112 - Jun 19, 23:04 UTCJun 20, 10:09 UTC11h 5m
2026-06-19 APZ111 - Jun 19, 09:14 UTCJun 19, 19:54 UTC10h 40m
2026-06-18 APZ152 - Jun 18, 00:50 UTCJun 18, 10:10 UTC9h 20m
2026-06-17 APZ151 - Jun 17, 13:40 UTCJun 17, 15:30 UTC1h 50m
2026-06-15 APZ102 - Jun 15, 17:59 UTCJun 16, 06:25 UTC12h 25m
2026-06-15 APZ101 - Jun 15, 04:15 UTCJun 15, 14:50 UTC10h 35m

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 HL8704 page for operator, model, and routing details .

Mode-S 71C704 frequently asked

What is Mode-S code 71C704?
71C704 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8704.
Where is Mode-S 71C704 registered?
Mode-S code 71C704 is allocated to Korea, South (KR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 71C704 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C704, octal 34343404, decimal 7,456,516.
What flights does 71C704 operate?
Mode-S 71C704 has broadcast 20 distinct callsigns, including APZ801, APZ802, APZ152, APZ151, APZ104.