Apparatus

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sensors Mode-S transponder

71BD54

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

Currently assigned to HL7554 · AIRBUS A-330-300

Hex
71BD54
Octal
34336524
Decimal
7,454,036
Country
KR
Tail
HL7554
Type
A333
No current signal · last broadcast 3h ago
Flights observed
108
Distinct callsigns
11
Country
KR
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 71BD54.

Country allocation

The ICAO 24-bit address 71BD54 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 11 distinct

Callsign Airline Flights Last seen
KAL660 Korean Air 22 2026-05-30
KAL659 Korean Air 22 2026-05-30
KAL657 Korean Air 16 2026-05-19
KAL2041 Korean Air 16 2026-05-29
KAL658 Korean Air 14 2026-05-19
KAL2042 Korean Air 11 2026-05-29
KAL2001 Korean Air 2 2026-05-05
KAL459 Korean Air 1 2026-05-11
KAL458 Korean Air 1 2026-04-21
KAL2002 Korean Air 1 2026-05-05
KAL166 - 1 2026-04-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 KAL659 ICN → BKK May 30, 11:20 UTCMay 30, 11:45 UTC25m
2026-05-30 KAL660 BKK → ICN May 30, 03:10 UTCMay 30, 08:20 UTC5h 10m
2026-05-29 KAL659 ICN → BKK May 29, 11:10 UTCMay 29, 16:25 UTC5h 15m
2026-05-29 KAL2042 UBN → ICN May 29, 07:25 UTCMay 29, 07:45 UTC20m
2026-05-29 KAL2041 ICN → UBN May 29, 00:15 UTCMay 29, 01:55 UTC1h 40m
2026-05-28 KAL660 BKK → ICN May 28, 03:10 UTCMay 28, 08:25 UTC5h 15m
2026-05-27 KAL659 ICN → BKK May 27, 11:35 UTCMay 27, 16:25 UTC4h 50m
2026-05-27 KAL660 BKK → ICN May 27, 03:14 UTCMay 27, 08:30 UTC5h 15m
2026-05-26 KAL659 ICN → BKK May 26, 11:15 UTCMay 26, 16:10 UTC4h 55m
2026-05-26 KAL660 BKK → ICN May 26, 03:19 UTCMay 26, 08:34 UTC5h 15m
2026-05-25 KAL659 ICN → BKK May 25, 11:05 UTCMay 25, 16:05 UTC5h 0m
2026-05-25 KAL660 BKK → ICN May 25, 03:10 UTCMay 25, 08:25 UTC5h 15m
2026-05-24 KAL659 ICN → BKK May 24, 11:10 UTCMay 24, 16:20 UTC5h 10m
2026-05-24 KAL2042 UBN → ICN May 24, 07:25 UTCMay 24, 07:50 UTC25m
2026-05-24 KAL2041 ICN → UBN May 24, 00:05 UTCMay 24, 00:30 UTC25m
2026-05-23 KAL660 BKK → ICN May 23, 03:15 UTCMay 23, 08:30 UTC5h 15m
2026-05-22 KAL659 ICN → BKK May 22, 11:00 UTCMay 22, 16:05 UTC5h 5m
2026-05-22 KAL660 BKK → ICN May 22, 03:15 UTCMay 22, 08:30 UTC5h 15m
2026-05-21 KAL659 ICN → BKK May 21, 11:10 UTCMay 21, 16:25 UTC5h 15m
2026-05-21 KAL2042 UBN → ICN May 21, 07:35 UTCMay 21, 08:05 UTC30m
2026-05-21 KAL2041 ICN → UBN May 21, 00:05 UTCMay 21, 01:45 UTC1h 40m
2026-05-20 KAL2042 UBN → ICN May 20, 08:10 UTCMay 20, 08:15 UTC5m
2026-05-20 KAL2041 ICN → UBN May 20, 00:15 UTCMay 20, 01:50 UTC1h 35m
2026-05-19 KAL658 BKK → ICN May 19, 15:05 UTCMay 19, 20:05 UTC5h 0m
2026-05-19 KAL657 ICN → BKK May 19, 01:10 UTCMay 19, 06:10 UTC5h 0m
2026-05-18 KAL2042 UBN → ICN May 18, 07:25 UTCMay 18, 07:50 UTC25m
2026-05-18 KAL2041 ICN → UBN May 18, 00:00 UTCMay 18, 01:30 UTC1h 30m
2026-05-17 KAL2042 UBN → ICN May 17, 07:30 UTCMay 17, 07:50 UTC20m
2026-05-17 KAL2041 ICN → UBN May 17, 00:00 UTCMay 17, 00:15 UTC15m
2026-05-16 KAL658 BKK → ICN May 16, 15:05 UTCMay 16, 20:05 UTC5h 0m
2026-05-16 KAL657 ICN → BKK May 16, 01:10 UTCMay 16, 06:20 UTC5h 11m
2026-05-15 KAL658 BKK → ICN May 15, 14:50 UTCMay 15, 19:45 UTC4h 55m
2026-05-15 KAL657 ICN → BKK May 15, 01:10 UTCMay 15, 06:25 UTC5h 15m
2026-05-14 KAL660 BKK → ICN May 14, 03:10 UTCMay 14, 08:10 UTC5h 0m
2026-05-13 KAL659 ICN → BKK May 13, 11:15 UTCMay 13, 16:35 UTC5h 20m
2026-05-13 KAL660 BKK → ICN May 13, 03:15 UTCMay 13, 08:20 UTC5h 5m
2026-05-12 KAL659 ICN → BKK May 12, 11:25 UTCMay 12, 16:35 UTC5h 10m
2026-05-11 KAL459 ICN → DAD May 11, 09:45 UTCMay 11, 19:55 UTC10h 10m
2026-05-11 KAL2042 UBN → ICN May 11, 07:30 UTCMay 11, 07:40 UTC10m
2026-05-11 KAL2041 ICN → UBN May 11, 00:05 UTCMay 11, 00:19 UTC15m
2026-05-10 KAL660 BKK → ICN May 10, 03:14 UTCMay 10, 08:05 UTC4h 50m
2026-05-09 KAL659 ICN → BKK May 9, 11:20 UTCMay 9, 16:35 UTC5h 15m
2026-05-09 KAL660 BKK → ICN May 9, 03:10 UTCMay 9, 08:10 UTC5h 0m
2026-05-08 KAL659 ICN → BKK May 8, 11:09 UTCMay 8, 16:25 UTC5h 15m
2026-05-08 KAL660 BKK → ICN May 8, 03:14 UTCMay 8, 08:29 UTC5h 15m
2026-05-07 KAL659 ICN → BKK May 7, 11:50 UTCMay 7, 17:05 UTC5h 15m
2026-05-07 KAL2041 ICN → UBN May 7, 00:20 UTCMay 7, 02:00 UTC1h 40m
2026-05-06 KAL658 BKK → ICN May 6, 15:20 UTCMay 6, 20:15 UTC4h 54m
2026-05-06 KAL657 ICN → BKK May 6, 01:05 UTCMay 6, 06:15 UTC5h 10m
2026-05-05 KAL2002 HKG → ICN May 5, 04:45 UTCMay 5, 07:30 UTC2h 45m

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 HL7554 page for operator, model, and routing details .

Mode-S 71BD54 frequently asked

What is Mode-S code 71BD54?
71BD54 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7554.
Where is Mode-S 71BD54 registered?
Mode-S code 71BD54 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 71BD54 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BD54, octal 34336524, decimal 7,454,036.
What flights does 71BD54 operate?
Mode-S 71BD54 has broadcast 11 distinct callsigns, including KAL660, KAL659, KAL657, KAL2041, KAL658.