Apparatus

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sensors Mode-S transponder

71C717

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

Currently assigned to HL8717 · BOEING 737 MAX 8

Hex
71C717
Octal
34343427
Decimal
7,456,535
Country
KR
Tail
HL8717
Type
B38M
No current signal · last broadcast 6h ago
Flights observed
453
Distinct callsigns
20
Country
KR
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 71C717.

Country allocation

The ICAO 24-bit address 71C717 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
ESR861 - 31 2026-07-09
ESR614 - 23 2026-07-10
ESR613 - 22 2026-07-10
ESR606 - 19 2026-07-14
ESR605 - 19 2026-07-13
ESR602 - 19 2026-07-10
ESR862 - 18 2026-07-09
ESR601 - 16 2026-07-09
ESR604 - 15 2026-07-14
ESR603 - 14 2026-07-14
ESR612 - 13 2026-07-12
ESR611 - 13 2026-07-12
ESR632 - 12 2026-06-30
ESR518 - 11 2026-07-11
ESR607 - 10 2026-06-26
ESR817 - 9 2026-06-28
ESR650 - 9 2026-07-08
ESR649 - 9 2026-07-08
ESR626 - 9 2026-07-11
ESR608 - 9 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ESR604 NRT → ICN Jul 14, 10:10 UTCJul 14, 12:10 UTC2h 0m
2026-07-14 ESR603 ICN → NRT Jul 14, 06:25 UTCJul 14, 08:20 UTC1h 55m
2026-07-14 ESR606 NRT → ICN Jul 14, 02:15 UTCJul 14, 04:15 UTC2h 0m
2026-07-13 ESR605 ICN → NRT Jul 13, 22:40 UTCJul 14, 00:35 UTC1h 55m
2026-07-13 ESR8531 ICN → ICN Jul 13, 07:10 UTCJul 13, 11:50 UTC4h 40m
2026-07-13 ESR882 TPE → ICN Jul 13, 03:15 UTCJul 13, 05:20 UTC2h 5m
2026-07-12 ESR881 ICN → TPE Jul 12, 22:55 UTCJul 13, 01:01 UTC2h 5m
2026-07-12 ESR604 NRT → ICN Jul 12, 09:55 UTCJul 12, 11:45 UTC1h 50m
2026-07-12 ESR603 ICN → NRT Jul 12, 06:25 UTCJul 12, 08:20 UTC1h 55m
2026-07-12 ESR612 KIX → ICN Jul 12, 03:25 UTCJul 12, 04:50 UTC1h 25m
2026-07-12 ESR611 ICN → KIX Jul 12, 00:40 UTCJul 12, 02:01 UTC1h 20m
2026-07-11 ESR518 - Jul 11, 21:30 UTCJul 11, 21:45 UTC15m
2026-07-11 ESR518 - Jul 11, 17:00 UTCJul 11, 18:10 UTC1h 10m
2026-07-11 ESR517 - Jul 11, 09:40 UTCJul 11, 14:25 UTC4h 45m
2026-07-11 ESR626 - Jul 11, 04:10 UTCJul 11, 06:30 UTC2h 20m
2026-07-11 ESR625 - Jul 11, 00:30 UTCJul 11, 02:45 UTC2h 15m
2026-07-10 ESR614 KIX → ICN Jul 10, 09:20 UTCJul 10, 10:45 UTC1h 25m
2026-07-10 ESR613 ICN → KIX Jul 10, 06:40 UTCJul 10, 08:05 UTC1h 25m
2026-07-10 ESR602 NRT → ICN Jul 10, 02:45 UTCJul 10, 04:55 UTC2h 10m
2026-07-09 ESR601 ICN → NRT Jul 9, 23:15 UTCJul 10, 01:10 UTC1h 55m
2026-07-09 ESR862 - Jul 9, 16:20 UTCJul 9, 19:35 UTC3h 15m
2026-07-09 ESR861 ICN → HKG Jul 9, 11:35 UTCJul 9, 14:40 UTC3h 5m
2026-07-09 ESR672 - Jul 9, 07:55 UTCJul 9, 09:15 UTC1h 20m
2026-07-09 ESR671 - Jul 9, 05:30 UTCJul 9, 06:50 UTC1h 20m
2026-07-09 ESR606 NRT → ICN Jul 9, 02:15 UTCJul 9, 04:15 UTC2h 0m
2026-07-08 ESR605 ICN → NRT Jul 8, 22:35 UTCJul 9, 00:30 UTC1h 55m
2026-07-08 ESR650 - Jul 8, 11:55 UTCJul 8, 13:00 UTC1h 5m
2026-07-08 ESR649 - Jul 8, 09:35 UTCJul 8, 10:35 UTC1h 0m
2026-07-08 ESR648 - Jul 8, 06:35 UTCJul 8, 07:35 UTC1h 0m
2026-07-08 ESR647 - Jul 8, 03:50 UTCJul 8, 04:40 UTC50m
2026-07-08 ESR136 - Jul 8, 00:25 UTCJul 8, 00:45 UTC20m
2026-07-07 ESR136 - Jul 7, 11:30 UTCJul 7, 23:30 UTC12h 0m
2026-07-07 ESR602 NRT → ICN Jul 7, 02:50 UTCJul 7, 04:50 UTC2h 0m
2026-07-06 ESR601 - Jul 6, 23:15 UTCJul 7, 01:10 UTC1h 55m
2026-07-06 ESR820 - Jul 6, 09:10 UTCJul 6, 09:30 UTC20m
2026-07-06 ESR819 - Jul 6, 06:10 UTCJul 6, 06:25 UTC15m
2026-07-06 ESR606 NRT → ICN Jul 6, 02:10 UTCJul 6, 04:15 UTC2h 5m
2026-07-05 ESR605 ICN → NRT Jul 5, 22:40 UTCJul 6, 00:30 UTC1h 50m
2026-07-05 ESR820 - Jul 5, 08:50 UTCJul 5, 09:15 UTC25m
2026-07-05 ESR819 - Jul 5, 05:55 UTCJul 5, 06:10 UTC15m
2026-07-05 ESR606 - Jul 5, 02:10 UTCJul 5, 04:15 UTC2h 5m
2026-07-04 ESR605 ICN → NRT Jul 4, 22:45 UTCJul 5, 00:40 UTC1h 55m
2026-07-04 ESR604 NRT → ICN Jul 4, 09:55 UTCJul 4, 11:55 UTC2h 0m
2026-07-04 ESR603 ICN → NRT Jul 4, 06:40 UTCJul 4, 08:35 UTC1h 55m
2026-07-04 ESR612 KIX → ICN Jul 4, 03:45 UTCJul 4, 05:10 UTC1h 25m
2026-07-04 ESR611 ICN → KIX Jul 4, 00:35 UTCJul 4, 01:50 UTC1h 15m
2026-07-03 ESR862 - Jul 3, 16:45 UTCJul 3, 19:45 UTC3h 0m
2026-07-03 ESR861 - Jul 3, 14:10 UTCJul 3, 14:30 UTC20m
2026-07-03 ESR861 - Jul 3, 11:20 UTCJul 3, 13:35 UTC2h 15m
2026-07-03 ESR819 - Jul 3, 05:55 UTCJul 3, 06:10 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 HL8717 page for operator, model, and routing details .

Mode-S 71C717 frequently asked

What is Mode-S code 71C717?
71C717 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8717.
Where is Mode-S 71C717 registered?
Mode-S code 71C717 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 71C717 broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C717, octal 34343427, decimal 7,456,535.
What flights does 71C717 operate?
Mode-S 71C717 has broadcast 20 distinct callsigns, including ESR861, ESR614, ESR613, ESR606, ESR605.