Apparatus

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sensors Mode-S transponder

71C517

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

Currently assigned to HL8517 · BOEING 787-9 Dreamliner

Hex
71C517
Octal
34342427
Decimal
7,456,023
Country
KR
Tail
HL8517
Type
B789
No current signal · last broadcast 2h ago
Flights observed
133
Distinct callsigns
17
Country
KR
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 71C517.

Country allocation

The ICAO 24-bit address 71C517 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 17 distinct

Callsign Airline Flights Last seen
APZ132 - 31 2026-07-12
APZ131 - 30 2026-07-11
APZ136 - 15 2026-07-13
APZ135 - 15 2026-07-13
APZ101 - 11 2026-07-05
APZ102 - 9 2026-07-05
APZ736 - 3 2026-07-04
APZ735 - 3 2026-07-04
APZ152 - 3 2026-07-07
APZ151 - 2 2026-07-06
APZ112 - 2 2026-06-15
APZ111 - 2 2026-06-15
APZ104 - 2 2026-06-30
APZ103 - 2 2026-06-29
APZ732 Air Premiea 1 2026-05-14
APZ731 Air Premiea 1 2026-05-14
APZ621 Air Premiea 1 2026-05-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 APZ136 IAD → ICN Jul 13, 17:45 UTCJul 14, 08:10 UTC14h 25m
2026-07-13 APZ135 ICN → IAD Jul 13, 01:25 UTCJul 13, 14:45 UTC13h 20m
2026-07-12 APZ132 EWR → ICN Jul 12, 05:20 UTCJul 12, 19:40 UTC14h 20m
2026-07-11 APZ131 - Jul 11, 13:00 UTCJul 12, 02:15 UTC13h 15m
2026-07-10 APZ136 IAD → ICN Jul 10, 17:40 UTCJul 11, 07:50 UTC14h 10m
2026-07-10 APZ135 ICN → IAD Jul 10, 01:20 UTCJul 10, 14:50 UTC13h 30m
2026-07-09 APZ132 - Jul 9, 05:20 UTCJul 9, 19:10 UTC13h 50m
2026-07-08 APZ131 ICN → EWR Jul 8, 12:40 UTCJul 9, 02:10 UTC13h 30m
2026-07-07 APZ152 - Jul 7, 07:40 UTCJul 7, 09:50 UTC2h 10m
2026-07-06 APZ151 - Jul 6, 13:50 UTCJul 6, 21:50 UTC8h 0m
2026-07-05 APZ102 - Jul 5, 18:10 UTCJul 6, 06:25 UTC12h 15m
2026-07-05 APZ101 - Jul 5, 04:15 UTCJul 5, 15:00 UTC10h 45m
2026-07-04 APZ736 NRT → ICN Jul 4, 09:10 UTCJul 4, 11:05 UTC1h 55m
2026-07-04 APZ735 - Jul 4, 05:10 UTCJul 4, 07:05 UTC1h 55m
2026-07-03 APZ132 - Jul 3, 05:55 UTCJul 3, 20:20 UTC14h 25m
2026-07-02 APZ131 ICN → EWR Jul 2, 12:40 UTCJul 3, 01:45 UTC13h 5m
2026-07-01 APZ136 IAD → ICN Jul 1, 17:45 UTCJul 2, 08:15 UTC14h 30m
2026-07-01 APZ135 ICN → IAD Jul 1, 01:20 UTCJul 1, 14:40 UTC13h 20m
2026-06-30 APZ104 - Jun 30, 06:50 UTCJun 30, 19:10 UTC12h 20m
2026-06-29 APZ103 - Jun 29, 13:19 UTCJun 29, 23:39 UTC10h 20m
2026-06-28 APZ102 - Jun 28, 18:05 UTCJun 29, 06:50 UTC12h 45m
2026-06-28 APZ101 - Jun 28, 04:20 UTCJun 28, 14:34 UTC10h 15m
2026-06-27 APZ132 - Jun 27, 05:19 UTCJun 27, 19:55 UTC14h 35m
2026-06-26 APZ131 ICN → EWR Jun 26, 12:39 UTCJun 27, 01:44 UTC13h 5m
2026-06-25 APZ132 EWR → ICN Jun 25, 05:20 UTCJun 25, 19:39 UTC14h 20m
2026-06-24 APZ131 ICN → EWR Jun 24, 12:34 UTCJun 25, 01:44 UTC13h 10m
2026-06-22 APZ136 IAD → ICN Jun 22, 17:40 UTCJun 23, 08:15 UTC14h 35m
2026-06-22 APZ135 ICN → IAD Jun 22, 01:25 UTCJun 22, 14:24 UTC13h 0m
2026-06-21 APZ132 EWR → ICN Jun 21, 05:35 UTCJun 21, 19:39 UTC14h 5m
2026-06-20 APZ131 ICN → EWR Jun 20, 12:39 UTCJun 21, 02:20 UTC13h 40m
2026-06-19 APZ136 IAD → ICN Jun 19, 17:29 UTCJun 20, 07:29 UTC14h 0m
2026-06-19 APZ135 ICN → IAD Jun 19, 01:19 UTCJun 19, 14:44 UTC13h 25m
2026-06-18 APZ132 - Jun 18, 05:20 UTCJun 18, 19:25 UTC14h 5m
2026-06-17 APZ131 ICN → EWR Jun 17, 12:40 UTCJun 18, 02:05 UTC13h 25m
2026-06-15 APZ112 - Jun 15, 22:59 UTCJun 16, 10:49 UTC11h 50m
2026-06-15 APZ111 - Jun 15, 09:10 UTCJun 15, 19:14 UTC10h 5m
2026-06-14 APZ132 EWR → ICN Jun 14, 05:25 UTCJun 14, 19:45 UTC14h 20m
2026-06-13 APZ131 ICN → EWR Jun 13, 12:40 UTCJun 14, 01:55 UTC13h 15m
2026-06-12 APZ136 IAD → ICN Jun 12, 18:01 UTCJun 13, 08:20 UTC14h 19m
2026-06-12 APZ135 ICN → IAD Jun 12, 01:20 UTCJun 12, 14:10 UTC12h 50m
2026-06-11 APZ132 EWR → ICN Jun 11, 05:10 UTCJun 11, 19:40 UTC14h 30m
2026-06-10 APZ131 ICN → EWR Jun 10, 12:30 UTCJun 11, 01:45 UTC13h 15m
2026-06-09 APZ102 LAX → ICN Jun 9, 20:10 UTCJun 10, 07:10 UTC11h 0m
2026-06-09 APZ101 ICN → LAX Jun 9, 04:10 UTCJun 9, 14:20 UTC10h 10m
2026-06-08 APZ132 EWR → ICN Jun 8, 05:20 UTCJun 8, 19:55 UTC14h 35m
2026-06-07 APZ131 ICN → EWR Jun 7, 12:50 UTCJun 8, 02:20 UTC13h 30m
2026-06-05 APZ136 IAD → ICN Jun 5, 20:10 UTCJun 6, 10:39 UTC14h 30m
2026-06-05 APZ135 ICN → IAD Jun 5, 01:20 UTCJun 5, 14:40 UTC13h 20m
2026-06-03 APZ112 SFO → ICN Jun 3, 23:10 UTCJun 4, 10:40 UTC11h 30m
2026-06-03 APZ111 ICN → SFO Jun 3, 09:15 UTCJun 3, 19:25 UTC10h 10m

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 HL8517 page for operator, model, and routing details .

Mode-S 71C517 frequently asked

What is Mode-S code 71C517?
71C517 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8517.
Where is Mode-S 71C517 registered?
Mode-S code 71C517 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 71C517 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C517, octal 34342427, decimal 7,456,023.
What flights does 71C517 operate?
Mode-S 71C517 has broadcast 17 distinct callsigns, including APZ132, APZ131, APZ136, APZ135, APZ101.