Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71BD53

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

Currently assigned to HL7553 · AIRBUS A-330-300

Hex
71BD53
Octal
34336523
Decimal
7,454,035
Country
KR
Tail
HL7553
Type
A333
No current signal · last broadcast 2d ago
Flights observed
192
Distinct callsigns
20
Country
KR
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 71BD53.

Country allocation

The ICAO 24-bit address 71BD53 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
KAL660 - 42 2026-07-11
KAL659 - 38 2026-07-10
KAL2042 - 23 2026-07-10
KAL2041 - 23 2026-07-10
KAL658 Korean Air 15 2026-06-16
KAL657 - 13 2026-06-16
KAL2011 - 7 2026-07-11
KAL2012 - 4 2026-07-11
KAL867 Korean Air 3 2026-05-19
KAL624 - 2 2026-07-08
KAL623 - 2 2026-07-08
KAL460 - 2 2026-07-06
KAL459 Korean Air 2 2026-05-23
KAL442 Korean Air 2 2026-05-23
KAL441 Korean Air 2 2026-05-08
KAL141 Korean Air 2 2026-05-27
KAL868 Korean Air 1 2026-05-19
KAL844 Korean Air 1 2026-05-17
KAL843 Korean Air 1 2026-05-17
KAL752 Korean Air 1 2026-04-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 KAL2012 HKG → ICN Jul 11, 17:55 UTCJul 11, 21:35 UTC3h 40m
2026-07-11 KAL2011 ICN → HKG Jul 11, 12:20 UTCJul 11, 16:05 UTC3h 45m
2026-07-11 KAL660 - Jul 11, 08:25 UTCJul 11, 08:50 UTC25m
2026-07-11 KAL660 - Jul 11, 03:30 UTCJul 11, 05:05 UTC1h 35m
2026-07-10 KAL659 - Jul 10, 11:40 UTCJul 10, 16:35 UTC4h 55m
2026-07-10 KAL2042 - Jul 10, 07:25 UTCJul 10, 07:45 UTC20m
2026-07-10 KAL2041 - Jul 10, 00:00 UTCJul 10, 06:35 UTC6h 35m
2026-07-09 KAL2042 - Jul 9, 07:30 UTCJul 9, 07:55 UTC25m
2026-07-09 KAL2041 - Jul 9, 00:00 UTCJul 9, 06:40 UTC6h 40m
2026-07-08 KAL624 - Jul 8, 15:55 UTCJul 8, 19:20 UTC3h 25m
2026-07-08 KAL623 ICN → MNL Jul 8, 10:25 UTCJul 8, 14:00 UTC3h 35m
2026-07-07 KAL624 - Jul 7, 16:00 UTCJul 7, 19:25 UTC3h 25m
2026-07-07 KAL623 ICN → MNL Jul 7, 10:30 UTCJul 7, 14:10 UTC3h 40m
2026-07-07 KAL2042 - Jul 7, 07:40 UTCJul 7, 08:00 UTC20m
2026-07-07 KAL2042 - Jul 7, 01:20 UTCJul 7, 06:45 UTC5h 25m
2026-07-07 KAL2041 - Jul 7, 00:05 UTCJul 7, 00:25 UTC20m
2026-07-06 KAL460 ICN → ICN Jul 6, 10:00 UTCJul 6, 20:50 UTC10h 50m
2026-07-06 KAL2042 - Jul 6, 07:35 UTCJul 6, 07:55 UTC20m
2026-07-06 KAL2041 - Jul 6, 00:00 UTCJul 6, 01:40 UTC1h 40m
2026-07-05 KAL660 - Jul 5, 03:10 UTCJul 5, 08:30 UTC5h 20m
2026-07-04 KAL659 ICN → BKK Jul 4, 11:25 UTCJul 4, 16:30 UTC5h 5m
2026-07-04 KAL2042 - Jul 4, 07:35 UTCJul 4, 07:55 UTC20m
2026-07-04 KAL2041 - Jul 4, 00:10 UTCJul 4, 01:35 UTC1h 25m
2026-07-01 KAL660 - Jul 1, 05:35 UTCJul 1, 08:25 UTC2h 50m
2026-07-01 KAL660 - Jul 1, 03:10 UTCJul 1, 03:30 UTC20m
2026-06-30 KAL659 ICN → BKK Jun 30, 11:10 UTCJun 30, 16:10 UTC5h 0m
2026-06-30 KAL660 BKK → ICN Jun 30, 03:10 UTCJun 30, 08:40 UTC5h 30m
2026-06-29 KAL659 ICN → BKK Jun 29, 11:10 UTCJun 29, 16:15 UTC5h 5m
2026-06-29 KAL660 - Jun 29, 03:10 UTCJun 29, 08:24 UTC5h 15m
2026-06-28 KAL659 ICN → BKK Jun 28, 11:04 UTCJun 28, 16:09 UTC5h 5m
2026-06-28 KAL660 - Jun 28, 03:09 UTCJun 28, 08:14 UTC5h 5m
2026-06-27 KAL659 ICN → BKK Jun 27, 11:14 UTCJun 27, 16:14 UTC5h 0m
2026-06-27 KAL660 BKK → ICN Jun 27, 03:09 UTCJun 27, 08:14 UTC5h 5m
2026-06-26 KAL659 ICN → BKK Jun 26, 11:09 UTCJun 26, 16:09 UTC5h 0m
2026-06-23 KAL660 - Jun 23, 03:09 UTCJun 23, 08:04 UTC4h 55m
2026-06-22 KAL659 ICN → BKK Jun 22, 11:09 UTCJun 22, 16:20 UTC5h 10m
2026-06-22 KAL2042 - Jun 22, 07:25 UTCJun 22, 07:45 UTC20m
2026-06-22 KAL2041 - Jun 22, 00:10 UTCJun 22, 01:44 UTC1h 35m
2026-06-21 KAL2046 UBN → ICN Jun 21, 19:00 UTCJun 21, 19:20 UTC20m
2026-06-21 KAL2045 ICN → UBN Jun 21, 11:55 UTCJun 21, 13:34 UTC1h 40m
2026-06-21 KAL660 - Jun 21, 03:10 UTCJun 21, 08:25 UTC5h 15m
2026-06-20 KAL659 ICN → BKK Jun 20, 11:20 UTCJun 20, 16:14 UTC4h 55m
2026-06-20 KAL660 - Jun 20, 03:09 UTCJun 20, 08:14 UTC5h 5m
2026-06-19 KAL659 ICN → BKK Jun 19, 11:04 UTCJun 19, 15:59 UTC4h 55m
2026-06-19 KAL660 - Jun 19, 03:09 UTCJun 19, 08:29 UTC5h 20m
2026-06-18 KAL659 ICN → BKK Jun 18, 11:15 UTCJun 18, 16:15 UTC5h 0m
2026-06-18 KAL660 - Jun 18, 03:15 UTCJun 18, 08:25 UTC5h 10m
2026-06-17 KAL659 ICN → BKK Jun 17, 13:25 UTCJun 17, 16:50 UTC3h 25m
2026-06-17 KAL659 ICN → BKK Jun 17, 11:50 UTCJun 17, 12:35 UTC45m
2026-06-17 KAL2042 - Jun 17, 07:30 UTCJun 17, 07:55 UTC25m

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 HL7553 page for operator, model, and routing details .

Mode-S 71BD53 frequently asked

What is Mode-S code 71BD53?
71BD53 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7553.
Where is Mode-S 71BD53 registered?
Mode-S code 71BD53 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 71BD53 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BD53, octal 34336523, decimal 7,454,035.
What flights does 71BD53 operate?
Mode-S 71BD53 has broadcast 20 distinct callsigns, including KAL660, KAL659, KAL2042, KAL2041, KAL658.