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 1h ago
Flights observed
222
Distinct callsigns
20
Country
KR
Last broadcast
1h 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 20 distinct

Callsign Airline Flights Last seen
KAL2041 - 34 2026-07-12
KAL2042 - 28 2026-07-13
KAL660 - 26 2026-06-26
KAL659 - 26 2026-06-25
KAL657 - 26 2026-06-30
KAL658 Korean Air 25 2026-06-30
KAL622 - 7 2026-07-14
KAL621 - 6 2026-07-13
KAL624 - 5 2026-07-14
KAL623 - 5 2026-07-14
KAL2046 Korean Air 4 2026-07-12
KAL2045 Korean Air 4 2026-07-12
KAL459 - 3 2026-07-09
KAL892 - 2 2026-07-08
KAL887 - 2 2026-06-25
KAL442 - 2 2026-06-17
KAL441 Korean Air 2 2026-06-16
KAL2011 Korean Air 2 2026-06-04
KAL2001 Korean Air 2 2026-05-05
KAL868 - 1 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 KAL624 - Jul 14, 16:05 UTCJul 14, 19:00 UTC2h 55m
2026-07-14 KAL623 - Jul 14, 10:25 UTCJul 14, 13:45 UTC3h 20m
2026-07-14 KAL622 - Jul 14, 04:40 UTCJul 14, 08:10 UTC3h 30m
2026-07-13 KAL621 - Jul 13, 23:10 UTCJul 14, 02:40 UTC3h 30m
2026-07-13 KAL624 - Jul 13, 15:45 UTCJul 13, 19:10 UTC3h 25m
2026-07-13 KAL623 ICN → MNL Jul 13, 10:25 UTCJul 13, 13:45 UTC3h 20m
2026-07-13 KAL2042 - Jul 13, 07:35 UTCJul 13, 07:55 UTC20m
2026-07-12 KAL2041 - Jul 12, 23:55 UTCJul 13, 01:20 UTC1h 25m
2026-07-12 KAL2046 UBN → ICN Jul 12, 19:01 UTCJul 12, 19:20 UTC20m
2026-07-12 KAL2045 ICN → UBN Jul 12, 11:55 UTCJul 12, 13:20 UTC1h 25m
2026-07-12 KAL2042 - Jul 12, 07:20 UTCJul 12, 07:35 UTC15m
2026-07-12 KAL2041 - Jul 12, 00:01 UTCJul 12, 01:35 UTC1h 35m
2026-07-11 KAL622 - Jul 11, 10:05 UTCJul 11, 10:35 UTC30m
2026-07-11 KAL622 - Jul 11, 06:10 UTCJul 11, 07:45 UTC1h 35m
2026-07-10 KAL621 - Jul 10, 23:50 UTCJul 11, 04:15 UTC4h 25m
2026-07-10 KAL622 - Jul 10, 05:15 UTCJul 10, 08:50 UTC3h 35m
2026-07-09 KAL621 - Jul 9, 23:10 UTCJul 10, 02:50 UTC3h 40m
2026-07-09 KAL459 - Jul 9, 10:05 UTCJul 9, 20:15 UTC10h 10m
2026-07-08 KAL892 - Jul 8, 11:05 UTCJul 9, 06:10 UTC19h 5m
2026-07-08 KAL892 - Jul 8, 10:30 UTCJul 9, 06:10 UTC19h 40m
2026-07-08 KAL622 - Jul 8, 04:50 UTCJul 8, 08:15 UTC3h 25m
2026-07-07 KAL621 - Jul 7, 23:30 UTCJul 8, 03:00 UTC3h 30m
2026-07-07 KAL868 - Jul 7, 07:45 UTCJul 7, 08:20 UTC35m
2026-07-07 KAL867 - Jul 7, 00:25 UTCJul 7, 01:10 UTC45m
2026-07-06 KAL752 HND → ICN Jul 6, 17:15 UTCJul 6, 19:15 UTC2h 0m
2026-07-06 KAL751 - Jul 6, 11:50 UTCJul 6, 13:30 UTC1h 40m
2026-07-06 KAL622 MNL → ICN Jul 6, 04:50 UTCJul 6, 08:15 UTC3h 25m
2026-07-05 KAL621 - Jul 5, 23:20 UTCJul 6, 02:55 UTC3h 35m
2026-07-05 KAL2046 UBN → ICN Jul 5, 19:35 UTCJul 5, 19:55 UTC20m
2026-07-05 KAL2045 ICN → UBN Jul 5, 12:00 UTCJul 5, 12:20 UTC20m
2026-07-05 KAL2042 - Jul 5, 07:35 UTCJul 5, 07:55 UTC20m
2026-07-05 KAL2041 - Jul 5, 00:05 UTCJul 5, 01:40 UTC1h 35m
2026-07-04 KAL624 - Jul 4, 16:20 UTCJul 4, 19:45 UTC3h 25m
2026-07-04 KAL623 ICN → MNL Jul 4, 10:45 UTCJul 4, 14:20 UTC3h 35m
2026-07-04 KAL622 - Jul 4, 04:30 UTCJul 4, 08:00 UTC3h 30m
2026-07-03 KAL621 - Jul 3, 23:05 UTCJul 4, 02:30 UTC3h 25m
2026-07-03 KAL2042 - Jul 3, 07:50 UTCJul 3, 08:10 UTC20m
2026-07-03 KAL2041 - Jul 3, 00:00 UTCJul 3, 06:55 UTC6h 55m
2026-07-02 KAL624 - Jul 2, 16:00 UTCJul 2, 19:20 UTC3h 20m
2026-07-02 KAL623 ICN → MNL Jul 2, 10:35 UTCJul 2, 14:10 UTC3h 35m
2026-07-02 KAL2042 - Jul 2, 07:35 UTCJul 2, 08:00 UTC25m
2026-07-02 KAL2041 - Jul 2, 00:00 UTCJul 2, 01:40 UTC1h 40m
2026-07-01 KAL624 - Jul 1, 16:10 UTCJul 1, 19:35 UTC3h 25m
2026-07-01 KAL623 - Jul 1, 10:15 UTCJul 1, 13:45 UTC3h 30m
2026-07-01 KAL2042 - Jul 1, 07:35 UTCJul 1, 07:55 UTC20m
2026-06-30 KAL2041 - Jun 30, 23:55 UTCJul 1, 01:25 UTC1h 30m
2026-06-30 KAL658 BKK → ICN Jun 30, 15:00 UTCJun 30, 20:00 UTC5h 0m
2026-06-30 KAL657 - Jun 30, 01:25 UTCJun 30, 06:25 UTC5h 0m
2026-06-29 KAL658 BKK → ICN Jun 29, 15:14 UTCJun 29, 20:09 UTC4h 55m
2026-06-29 KAL657 ICN → BKK Jun 29, 01:25 UTCJun 29, 06:24 UTC5h 0m

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 1h 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 20 distinct callsigns, including KAL2041, KAL2042, KAL660, KAL659, KAL657.