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
Broadcasting now · callsign APZ735 · 450 ft
Flights observed
77
Distinct callsigns
13
Country
KR
Last broadcast
1h ago

Current position

71C517 is currently broadcasting. Map zoomed to live position.

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 13 distinct

Callsign Airline Flights Last seen
APZ132 Air Premiea 21 2026-05-29
APZ131 Air Premiea 20 2026-05-28
APZ101 Air Premiea 8 2026-04-24
APZ136 Air Premiea 7 2026-05-27
APZ135 Air Premiea 7 2026-05-27
APZ102 Air Premiea 6 2026-04-24
APZ735 Air Premiea 2 2026-05-30
APZ736 Air Premiea 1 2026-05-14
APZ732 Air Premiea 1 2026-05-14
APZ731 Air Premiea 1 2026-05-14
APZ621 Air Premiea 1 2026-05-13
APZ104 Air Premiea 1 2026-05-07
APZ103 Air Premiea 1 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 APZ735 ICN → NRT May 30, 05:15 UTCMay 30, 05:40 UTC25m
2026-05-29 APZ132 EWR → ICN May 29, 05:45 UTCMay 29, 20:40 UTC14h 55m
2026-05-28 APZ131 ICN → EWR May 28, 12:50 UTCMay 29, 01:55 UTC13h 5m
2026-05-27 APZ136 IAD → ICN May 27, 17:55 UTCMay 28, 08:40 UTC14h 45m
2026-05-27 APZ135 ICN → IAD May 27, 01:29 UTCMay 27, 15:05 UTC13h 35m
2026-05-25 APZ136 IAD → ICN May 25, 17:45 UTCMay 26, 08:10 UTC14h 25m
2026-05-25 APZ135 ICN → IAD May 25, 02:00 UTCMay 25, 14:55 UTC12h 55m
2026-05-24 APZ132 EWR → ICN May 24, 05:25 UTCMay 24, 20:00 UTC14h 35m
2026-05-23 APZ131 ICN → EWR May 23, 12:50 UTCMay 24, 02:10 UTC13h 20m
2026-05-22 APZ136 IAD → ICN May 22, 17:40 UTCMay 23, 08:10 UTC14h 29m
2026-05-22 APZ135 ICN → IAD May 22, 01:25 UTCMay 22, 14:25 UTC13h 0m
2026-05-21 APZ132 EWR → ICN May 21, 05:40 UTCMay 21, 20:00 UTC14h 20m
2026-05-20 APZ131 ICN → EWR May 20, 13:30 UTCMay 21, 02:55 UTC13h 25m
2026-05-19 APZ132 EWR → ICN May 19, 05:15 UTCMay 19, 19:50 UTC14h 35m
2026-05-18 APZ131 ICN → EWR May 18, 12:35 UTCMay 19, 02:00 UTC13h 24m
2026-05-17 APZ136 IAD → ICN May 17, 17:35 UTCMay 18, 07:45 UTC14h 10m
2026-05-17 APZ135 ICN → IAD May 17, 01:10 UTCMay 17, 14:30 UTC13h 20m
2026-05-16 APZ132 EWR → ICN May 16, 05:15 UTCMay 16, 19:30 UTC14h 16m
2026-05-15 APZ131 ICN → EWR May 15, 12:35 UTCMay 16, 02:10 UTC13h 34m
2026-05-14 APZ736 NRT → ICN May 14, 11:35 UTCMay 14, 13:20 UTC1h 45m
2026-05-14 APZ735 ICN → NRT May 14, 07:35 UTCMay 14, 09:50 UTC2h 15m
2026-05-14 APZ732 NRT → ICN May 14, 03:55 UTCMay 14, 05:40 UTC1h 45m
2026-05-14 APZ731 ICN → NRT May 14, 00:00 UTCMay 14, 02:00 UTC2h 0m
2026-05-13 APZ621 ICN → DAD May 13, 09:10 UTCMay 13, 19:45 UTC10h 35m
2026-05-12 APZ132 EWR → ICN May 12, 06:40 UTCMay 12, 21:01 UTC14h 20m
2026-05-11 APZ131 ICN → EWR May 11, 15:20 UTCMay 12, 04:35 UTC13h 16m
2026-05-10 APZ132 EWR → ICN May 10, 05:14 UTCMay 10, 19:30 UTC14h 15m
2026-05-09 APZ131 ICN → EWR May 9, 12:50 UTCMay 10, 01:30 UTC12h 40m
2026-05-08 APZ136 IAD → ICN May 8, 17:40 UTCMay 9, 08:30 UTC14h 50m
2026-05-08 APZ135 ICN → IAD May 8, 01:29 UTCMay 8, 14:20 UTC12h 50m
2026-05-07 APZ104 LAX → ICN May 7, 06:50 UTCMay 7, 19:05 UTC12h 15m
2026-05-06 APZ103 ICN → LAX May 6, 13:25 UTCMay 7, 00:20 UTC10h 55m
2026-05-04 APZ136 IAD → ICN May 4, 18:00 UTCMay 5, 08:55 UTC14h 56m
2026-05-04 APZ135 ICN → IAD May 4, 01:24 UTCMay 4, 14:15 UTC12h 50m
2026-05-02 APZ132 EWR → ICN May 2, 05:35 UTCMay 2, 20:20 UTC14h 45m
2026-05-01 APZ131 ICN → EWR May 1, 14:00 UTCMay 2, 03:20 UTC13h 20m
2026-04-30 APZ132 EWR → ICN Apr 30, 05:10 UTCApr 30, 19:45 UTC14h 35m
2026-04-29 APZ131 ICN → EWR Apr 29, 12:40 UTCApr 30, 01:30 UTC12h 49m
2026-04-27 APZ136 IAD → ICN Apr 27, 17:25 UTCApr 28, 08:25 UTC15h 0m
2026-04-27 APZ135 ICN → IAD Apr 27, 01:20 UTCApr 27, 14:25 UTC13h 5m
2026-04-26 APZ132 EWR → ICN Apr 26, 05:35 UTCApr 26, 20:05 UTC14h 30m
2026-04-25 APZ131 ICN → EWR Apr 25, 13:55 UTCApr 26, 02:15 UTC12h 20m
2026-04-25 APZ131 ICN → EWR Apr 25, 12:45 UTCApr 25, 13:10 UTC25m
2026-04-24 APZ102 LAX → ICN Apr 24, 17:55 UTCApr 25, 06:05 UTC12h 10m
2026-04-24 APZ101 ICN → LAX Apr 24, 04:30 UTCApr 24, 14:35 UTC10h 5m
2026-04-21 APZ102 LAX → ICN Apr 21, 18:00 UTCApr 22, 06:25 UTC12h 25m
2026-04-21 APZ101 ICN → LAX Apr 21, 05:30 UTCApr 21, 14:45 UTC9h 15m
2026-04-21 APZ101 ICN → LAX Apr 21, 04:25 UTCApr 21, 04:45 UTC20m
2026-04-20 APZ132 EWR → ICN Apr 20, 05:05 UTCApr 20, 19:45 UTC14h 40m
2026-04-19 APZ131 ICN → EWR Apr 19, 12:45 UTCApr 20, 02:00 UTC13h 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 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?
Yes. Mode-S 71C517 is currently airborne.
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 13 distinct callsigns, including APZ132, APZ131, APZ101, APZ136, APZ135.