Apparatus

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sensors Mode-S transponder

71BD61

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

Currently assigned to HL7561 · BOEING 737-800

Hex
71BD61
Octal
34336541
Decimal
7,454,049
Country
KR
Tail
HL7561
Type
B738
No current signal · last broadcast Jul 25, 21:50 UTC
Flights observed
521
Distinct callsigns
20
Country
KR
Last broadcast
Jul 25, 21:50 UTC

Last known position

Most recent position reported by Mode-S 71BD61.

Country allocation

The ICAO 24-bit address 71BD61 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
JNA671 - 17 2026-07-14
JNA510 - 15 2026-06-27
JNA516 - 14 2026-06-25
JNA511 - 14 2026-06-25
JNA506 - 14 2026-07-15
JNA501 Jin Air 14 2026-06-27
JNA672 Jin Air 13 2026-07-21
JNA660 - 13 2026-07-14
JNA512 Jin Air 13 2026-07-21
JNA509 - 13 2026-07-15
JNA472 - 13 2026-07-08
JNA471 - 13 2026-07-08
JNA508 - 12 2026-06-25
JNA513 Jin Air 11 2026-07-21
JNA659 Jin Air 10 2026-07-22
JNA515 - 10 2026-06-25
JNA401 - 10 2026-07-14
JNA505 - 9 2026-06-18
JNA467 - 9 2026-07-18
JNA402 - 9 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 JNA132 BKI → ICN Jul 25, 16:50 UTCJul 25, 21:50 UTC5h 0m
2026-07-25 JNA131 ICN → BKI Jul 25, 10:40 UTCJul 25, 15:15 UTC4h 35m
2026-07-25 JNA236 KIX → ICN Jul 25, 07:25 UTCJul 25, 08:45 UTC1h 20m
2026-07-25 JNA251 PUS → KIX Jul 25, 04:45 UTCJul 25, 05:55 UTC1h 10m
2026-07-25 JNA376 NGO → PUS Jul 25, 02:15 UTCJul 25, 03:20 UTC1h 5m
2026-07-24 JNA375 PUS → NGO Jul 24, 23:40 UTCJul 25, 00:45 UTC1h 5m
2026-07-24 JNA031 ICN → CEB Jul 24, 13:30 UTCJul 24, 22:35 UTC9h 5m
2026-07-24 JNA738 RMQ → ICN Jul 24, 09:45 UTCJul 24, 11:55 UTC2h 10m
2026-07-24 JNA737 ICN → RMQ Jul 24, 06:15 UTCJul 24, 08:25 UTC2h 10m
2026-07-24 JNA202 NRT → ICN Jul 24, 02:25 UTCJul 24, 04:15 UTC1h 50m
2026-07-23 JNA221 ICN → FUK Jul 23, 23:10 UTCJul 24, 00:55 UTC1h 45m
2026-07-23 JNA066 CRK → PUS Jul 23, 18:20 UTCJul 23, 21:30 UTC3h 10m
2026-07-23 JNA037 ICN → CRK Jul 23, 13:05 UTCJul 23, 16:30 UTC3h 25m
2026-07-23 JNA350 KKJ → ICN Jul 23, 09:35 UTCJul 23, 10:30 UTC55m
2026-07-23 JNA349 - Jul 23, 07:15 UTCJul 23, 08:00 UTC45m
2026-07-23 JNA234 KIX → ICN Jul 23, 04:35 UTCJul 23, 06:00 UTC1h 25m
2026-07-23 JNA233 ICN → KIX Jul 23, 01:30 UTCJul 23, 02:50 UTC1h 20m
2026-07-22 JNA032 - Jul 22, 13:05 UTCJul 22, 22:45 UTC9h 40m
2026-07-22 JNA570 CJU → PUS Jul 22, 11:10 UTCJul 22, 11:25 UTC15m
2026-07-22 JNA437 KPO → CJU Jul 22, 05:15 UTCJul 22, 05:25 UTC10m
2026-07-22 JNA436 CJU → KPO Jul 22, 03:40 UTCJul 22, 03:55 UTC15m
2026-07-22 JNA435 KPO → CJU Jul 22, 01:50 UTCJul 22, 02:05 UTC15m
2026-07-22 JNA659 GMP → KPO Jul 22, 00:10 UTCJul 22, 00:35 UTC25m
2026-07-21 JNA512 CJU → GMP Jul 21, 12:45 UTCJul 21, 13:25 UTC40m
2026-07-21 JNA513 GMP → CJU Jul 21, 10:35 UTCJul 21, 11:10 UTC35m
2026-07-21 JNA672 RSU → GMP Jul 21, 08:30 UTCJul 21, 09:15 UTC45m
2026-07-21 JNA565 PUS → CJU Jul 21, 05:00 UTCJul 21, 05:15 UTC15m
2026-07-21 JNA256 KIX → PUS Jul 21, 02:10 UTCJul 21, 03:15 UTC1h 5m
2026-07-20 JNA255 PUS → KIX Jul 20, 23:40 UTCJul 21, 00:50 UTC1h 10m
2026-07-20 JNA062 - Jul 20, 21:50 UTCJul 20, 22:10 UTC20m
2026-07-20 JNA031 - Jul 20, 13:05 UTCJul 20, 21:05 UTC8h 0m
2026-07-20 JNA210 NRT → ICN Jul 20, 09:30 UTCJul 20, 11:30 UTC2h 0m
2026-07-20 JNA209 - Jul 20, 06:10 UTCJul 20, 08:00 UTC1h 50m
2026-07-20 JNA274 FUK → ICN Jul 20, 03:35 UTCJul 20, 04:25 UTC50m
2026-07-20 JNA273 ICN → FUK Jul 20, 01:05 UTCJul 20, 01:50 UTC45m
2026-07-19 JNA132 - Jul 19, 17:00 UTCJul 19, 21:55 UTC4h 55m
2026-07-19 JNA131 - Jul 19, 10:45 UTCJul 19, 15:25 UTC4h 40m
2026-07-19 JNA206 NRT → ICN Jul 19, 04:50 UTCJul 19, 06:45 UTC1h 55m
2026-07-19 JNA205 ICN → NRT Jul 19, 01:20 UTCJul 19, 03:15 UTC1h 55m
2026-07-18 JNA032 - Jul 18, 13:20 UTCJul 18, 22:45 UTC9h 25m
2026-07-18 JNA570 - Jul 18, 11:10 UTCJul 18, 11:25 UTC15m
2026-07-18 JNA467 - Jul 18, 08:45 UTCJul 18, 09:00 UTC15m
2026-07-18 JNA468 - Jul 18, 07:20 UTCJul 18, 07:35 UTC15m
2026-07-18 JNA437 - Jul 18, 05:15 UTCJul 18, 05:30 UTC15m
2026-07-18 JNA436 - Jul 18, 03:45 UTCJul 18, 04:00 UTC15m
2026-07-18 JNA435 - Jul 18, 02:00 UTCJul 18, 02:09 UTC10m
2026-07-18 JNA659 GMP → KPO Jul 18, 00:29 UTCJul 18, 00:50 UTC20m
2026-07-17 JNA654 - Jul 17, 10:00 UTCJul 17, 10:35 UTC35m
2026-07-17 JNA653 - Jul 17, 08:20 UTCJul 17, 08:49 UTC30m
2026-07-17 JNA656 - Jul 17, 06:50 UTCJul 17, 07:20 UTC30m

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 HL7561 page for operator, model, and routing details .

Mode-S 71BD61 frequently asked

What is Mode-S code 71BD61?
71BD61 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7561.
Where is Mode-S 71BD61 registered?
Mode-S code 71BD61 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 71BD61 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 21:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BD61, octal 34336541, decimal 7,454,049.
What flights does 71BD61 operate?
Mode-S 71BD61 has broadcast 20 distinct callsigns, including JNA671, JNA510, JNA516, JNA511, JNA506.