Apparatus

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sensors Mode-S transponder

71BF57

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

Currently assigned to HL7757 · BOEING 737-800

Hex
71BF57
Octal
34337527
Decimal
7,454,551
Country
KR
Tail
HL7757
Type
B738
No current signal · last broadcast Jul 26, 20:10 UTC
Flights observed
364
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 20:10 UTC

Last known position

Most recent position reported by Mode-S 71BF57.

Country allocation

The ICAO 24-bit address 71BF57 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
JNA473 - 8 2026-06-21
JNA223 - 8 2026-06-16
JNA474 - 7 2026-06-21
JNA238 Jin Air 7 2026-06-08
JNA237 Jin Air 7 2026-06-08
JNA231 Jin Air 6 2026-06-26
JNA224 - 6 2026-06-16
JNA131 Jin Air 6 2026-06-05
JNA065 - 6 2026-06-25
JNA038 Jin Air 6 2026-06-25
JNA022 Jin Air 6 2026-06-04
JNA251 - 5 2026-06-27
JNA236 - 5 2026-06-27
JNA204 - 5 2026-06-26
JNA203 - 5 2026-06-25
JNA201 - 5 2026-07-21
JNA132 Jin Air 5 2026-06-05
JNA116 Jin Air 5 2026-06-20
JNA021 Jin Air 5 2026-06-04
JNA752 Jin Air 4 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JNA842 - Jul 26, 19:45 UTCJul 26, 20:10 UTC25m
2026-07-26 JNA841 ICN → HET Jul 26, 13:55 UTCJul 26, 18:50 UTC4h 55m
2026-07-26 JNA210 NRT → ICN Jul 26, 09:30 UTCJul 26, 11:30 UTC2h 0m
2026-07-26 JNA209 ICN → NRT Jul 26, 06:15 UTCJul 26, 08:15 UTC2h 1m
2026-07-25 JNA032 CEB → ICN Jul 25, 13:25 UTCJul 25, 23:05 UTC9h 40m
2026-07-25 JNA570 CJU → PUS Jul 25, 11:05 UTCJul 25, 11:25 UTC20m
2026-07-25 JNA467 KUV → CJU Jul 25, 09:15 UTCJul 25, 09:35 UTC20m
2026-07-25 JNA468 CJU → KUV Jul 25, 07:40 UTCJul 25, 07:50 UTC10m
2026-07-25 JNA437 KPO → CJU Jul 25, 05:25 UTCJul 25, 05:40 UTC15m
2026-07-25 JNA436 CJU → KPO Jul 25, 03:45 UTCJul 25, 04:00 UTC15m
2026-07-25 JNA435 KPO → CJU Jul 25, 01:50 UTCJul 25, 02:00 UTC10m
2026-07-25 JNA659 GMP → KPO Jul 25, 00:10 UTCJul 25, 00:35 UTC25m
2026-07-24 JNA660 - Jul 24, 11:05 UTCJul 24, 11:40 UTC35m
2026-07-24 JNA438 CJU → KPO Jul 24, 09:40 UTCJul 24, 09:55 UTC15m
2026-07-24 JNA453 KWJ → CJU Jul 24, 08:05 UTCJul 24, 08:15 UTC10m
2026-07-24 JNA454 CJU → KWJ Jul 24, 06:45 UTCJul 24, 07:00 UTC15m
2026-07-24 JNA509 GMP → CJU Jul 24, 04:30 UTCJul 24, 05:05 UTC35m
2026-07-24 JNA506 CJU → GMP Jul 24, 02:25 UTCJul 24, 03:10 UTC45m
2026-07-23 JNA671 GMP → RSU Jul 23, 23:00 UTCJul 23, 23:35 UTC35m
2026-07-23 JNA510 - Jul 23, 13:15 UTCJul 23, 13:50 UTC35m
2026-07-23 JNA569 PUS → CJU Jul 23, 11:05 UTCJul 23, 11:20 UTC15m
2026-07-23 JNA566 CJU → PUS Jul 23, 09:40 UTCJul 23, 10:00 UTC20m
2026-07-23 JNA427 TAE → CJU Jul 23, 07:00 UTCJul 23, 07:20 UTC20m
2026-07-23 JNA428 CJU → TAE Jul 23, 05:30 UTCJul 23, 05:50 UTC20m
2026-07-23 JNA401 CJJ → CJU Jul 23, 03:05 UTCJul 23, 03:30 UTC25m
2026-07-23 JNA402 CJU → CJJ Jul 23, 01:15 UTCJul 23, 01:45 UTC30m
2026-07-22 JNA563 PUS → CJU Jul 22, 23:30 UTCJul 22, 23:45 UTC15m
2026-07-22 JNA752 TPE → PUS Jul 22, 20:25 UTCJul 22, 21:15 UTC50m
2026-07-22 JNA752 TPE → PUS Jul 22, 19:00 UTCJul 22, 19:15 UTC15m
2026-07-22 JNA751 PUS → TPE Jul 22, 13:40 UTCJul 22, 15:30 UTC1h 50m
2026-07-22 JNA222 NRT → PUS Jul 22, 02:15 UTCJul 22, 03:55 UTC1h 40m
2026-07-21 JNA201 - Jul 21, 22:50 UTCJul 22, 00:45 UTC1h 55m
2026-07-21 JNA272 - Jul 21, 11:00 UTCJul 21, 12:05 UTC1h 5m
2026-07-21 JNA271 - Jul 21, 08:25 UTCJul 21, 09:20 UTC55m
2026-07-20 JNA996F - Jul 20, 21:50 UTCJul 20, 22:35 UTC45m
2026-06-28 JNA995F - Jun 28, 13:10 UTCJun 28, 13:55 UTC45m
2026-06-28 JNA274 - Jun 28, 03:29 UTCJun 28, 04:15 UTC45m
2026-06-28 JNA273 - Jun 28, 01:04 UTCJun 28, 01:55 UTC50m
2026-06-27 JNA088 ICN → ICN Jun 27, 12:09 UTCJun 27, 22:55 UTC10h 45m
2026-06-27 JNA236 KIX → ICN Jun 27, 07:30 UTCJun 27, 08:55 UTC1h 25m
2026-06-27 JNA251 PUS → KIX Jun 27, 04:39 UTCJun 27, 05:55 UTC1h 15m
2026-06-27 JNA252 - Jun 27, 01:49 UTCJun 27, 02:50 UTC1h 0m
2026-06-26 JNA231 ICN → CTS Jun 26, 23:04 UTCJun 27, 00:29 UTC1h 25m
2026-06-26 JNA212 - Jun 26, 10:55 UTCJun 26, 12:59 UTC2h 5m
2026-06-26 JNA211 ICN → NRT Jun 26, 07:10 UTCJun 26, 09:05 UTC1h 55m
2026-06-26 JNA204 - Jun 26, 03:10 UTCJun 26, 05:24 UTC2h 15m
2026-06-25 JNA203 ICN → NRT Jun 25, 23:19 UTCJun 26, 01:10 UTC1h 50m
2026-06-25 JNA038 CRK → ICN Jun 25, 18:00 UTCJun 25, 21:40 UTC3h 40m
2026-06-25 JNA065 - Jun 25, 13:24 UTCJun 25, 16:45 UTC3h 20m
2026-06-25 JNA312 CTS → PUS Jun 25, 08:34 UTCJun 25, 10:55 UTC2h 20m

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 HL7757 page for operator, model, and routing details .

Mode-S 71BF57 frequently asked

What is Mode-S code 71BF57?
71BF57 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7757.
Where is Mode-S 71BF57 registered?
Mode-S code 71BF57 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 71BF57 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BF57, octal 34337527, decimal 7,454,551.
What flights does 71BF57 operate?
Mode-S 71BF57 has broadcast 20 distinct callsigns, including JNA473, JNA223, JNA474, JNA238, JNA237.