Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 Jul 25, 23:55 UTC
Flights observed
253
Distinct callsigns
20
Country
KR
Last broadcast
Jul 25, 23:55 UTC

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 Korean Air 35 2026-07-23
KAL660 Korean Air 34 2026-07-25
KAL659 - 34 2026-07-24
KAL2042 - 29 2026-07-23
KAL657 - 26 2026-06-30
KAL658 Korean Air 25 2026-06-30
KAL622 Korean Air 9 2026-07-24
KAL621 Korean Air 8 2026-07-23
KAL624 Korean Air 7 2026-07-23
KAL623 Korean Air 7 2026-07-23
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
KAL867 - 2 2026-07-15
KAL836 - 2 2026-07-16
KAL442 - 2 2026-06-17
KAL441 Korean Air 2 2026-06-16
KAL2011 Korean Air 2 2026-06-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 KAL195F ICN → PUS Jul 25, 23:10 UTCJul 25, 23:50 UTC40m
2026-07-25 KAL660 BKK → ICN Jul 25, 07:45 UTCJul 25, 08:15 UTC30m
2026-07-25 KAL660 BKK → ICN Jul 25, 03:05 UTCJul 25, 04:45 UTC1h 40m
2026-07-24 KAL659 - Jul 24, 16:10 UTCJul 24, 16:35 UTC25m
2026-07-24 KAL659 - Jul 24, 11:20 UTCJul 24, 15:15 UTC3h 55m
2026-07-24 KAL622 MNL → ICN Jul 24, 05:05 UTCJul 24, 08:50 UTC3h 45m
2026-07-23 KAL621 ICN → MNL Jul 23, 23:25 UTCJul 24, 03:10 UTC3h 45m
2026-07-23 KAL624 MNL → ICN Jul 23, 16:00 UTCJul 23, 19:15 UTC3h 15m
2026-07-23 KAL623 ICN → MNL Jul 23, 10:20 UTCJul 23, 13:55 UTC3h 35m
2026-07-23 KAL2042 - Jul 23, 07:45 UTCJul 23, 08:05 UTC20m
2026-07-23 KAL2041 ICN → UBN Jul 23, 00:10 UTCJul 23, 01:45 UTC1h 35m
2026-07-22 KAL624 MNL → ICN Jul 22, 16:20 UTCJul 22, 19:35 UTC3h 15m
2026-07-22 KAL623 ICN → MNL Jul 22, 11:10 UTCJul 22, 14:25 UTC3h 15m
2026-07-20 KAL660 BKK → ICN Jul 20, 05:25 UTCJul 20, 08:30 UTC3h 5m
2026-07-20 KAL660 BKK → ICN Jul 20, 03:15 UTCJul 20, 03:25 UTC10m
2026-07-19 KAL659 - Jul 19, 15:55 UTCJul 19, 16:05 UTC10m
2026-07-19 KAL659 - Jul 19, 11:10 UTCJul 19, 13:55 UTC2h 45m
2026-07-19 KAL660 BKK → ICN Jul 19, 05:25 UTCJul 19, 08:15 UTC2h 50m
2026-07-19 KAL660 BKK → ICN Jul 19, 03:10 UTCJul 19, 03:25 UTC15m
2026-07-18 KAL659 - Jul 18, 16:00 UTCJul 18, 16:15 UTC15m
2026-07-18 KAL659 - Jul 18, 11:20 UTCJul 18, 14:05 UTC2h 45m
2026-07-18 KAL660 BKK → ICN Jul 18, 05:35 UTCJul 18, 08:40 UTC3h 5m
2026-07-18 KAL660 BKK → ICN Jul 18, 03:15 UTCJul 18, 03:30 UTC15m
2026-07-17 KAL659 - Jul 17, 16:34 UTCJul 17, 16:44 UTC10m
2026-07-17 KAL659 - Jul 17, 11:55 UTCJul 17, 14:39 UTC2h 45m
2026-07-17 KAL622 - Jul 17, 04:54 UTCJul 17, 08:35 UTC3h 40m
2026-07-16 KAL621 ICN → MNL Jul 16, 23:15 UTCJul 17, 02:30 UTC3h 15m
2026-07-16 KAL836 - Jul 16, 08:15 UTCJul 16, 08:50 UTC35m
2026-07-16 KAL836 - Jul 16, 05:55 UTCJul 16, 06:05 UTC10m
2026-07-16 KAL835 - Jul 16, 00:35 UTCJul 16, 01:20 UTC45m
2026-07-15 KAL867 ICN → ICN Jul 15, 00:15 UTCJul 15, 08:05 UTC7h 50m
2026-07-14 KAL624 MNL → ICN Jul 14, 16:05 UTCJul 14, 19:20 UTC3h 15m
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

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 Jul 25, 23:55 UTC.
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, KAL660, KAL659, KAL2042, KAL657.