Apparatus

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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 Jul 26, 19:35 UTC
Flights observed
232
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 19:35 UTC

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 - 44 2026-07-16
KAL659 - 40 2026-07-15
KAL2041 Korean Air 32 2026-07-26
KAL2042 Korean Air 31 2026-07-26
KAL658 Korean Air 15 2026-06-16
KAL657 - 13 2026-06-16
KAL2011 - 8 2026-07-21
KAL624 Korean Air 6 2026-07-26
KAL623 Korean Air 6 2026-07-26
KAL2012 Korean Air 5 2026-07-21
KAL867 Korean Air 3 2026-05-19
KAL459 - 3 2026-07-19
KAL622 Korean Air 2 2026-07-23
KAL621 Korean Air 2 2026-07-22
KAL460 - 2 2026-07-06
KAL442 Korean Air 2 2026-05-23
KAL441 Korean Air 2 2026-05-08
KAL2046 Korean Air 2 2026-07-23
KAL2045 Korean Air 2 2026-07-23
KAL141 Korean Air 2 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KAL624 MNL → ICN Jul 26, 15:50 UTCJul 26, 19:35 UTC3h 45m
2026-07-26 KAL623 ICN → MNL Jul 26, 10:20 UTCJul 26, 13:40 UTC3h 20m
2026-07-26 KAL2042 UBN → ICN Jul 26, 07:35 UTCJul 26, 08:00 UTC25m
2026-07-26 KAL2041 ICN → UBN Jul 26, 00:20 UTCJul 26, 01:50 UTC1h 30m
2026-07-25 KAL2042 UBN → ICN Jul 25, 07:20 UTCJul 25, 07:55 UTC35m
2026-07-25 KAL2041 ICN → UBN Jul 25, 00:05 UTCJul 25, 01:35 UTC1h 30m
2026-07-24 KAL624 MNL → ICN Jul 24, 16:05 UTCJul 24, 19:45 UTC3h 40m
2026-07-24 KAL623 ICN → MNL Jul 24, 10:20 UTCJul 24, 13:55 UTC3h 35m
2026-07-24 KAL2042 UBN → ICN Jul 24, 07:45 UTCJul 24, 08:00 UTC15m
2026-07-24 KAL2041 ICN → UBN Jul 24, 01:30 UTCJul 24, 06:55 UTC5h 25m
2026-07-24 KAL2041 ICN → UBN Jul 24, 00:10 UTCJul 24, 00:40 UTC30m
2026-07-23 KAL2046 UBN → ICN Jul 23, 18:55 UTCJul 23, 19:20 UTC25m
2026-07-23 KAL2045 ICN → UBN Jul 23, 11:45 UTCJul 23, 13:15 UTC1h 30m
2026-07-23 KAL622 MNL → ICN Jul 23, 05:00 UTCJul 23, 08:25 UTC3h 25m
2026-07-22 KAL621 ICN → MNL Jul 22, 23:15 UTCJul 23, 02:35 UTC3h 20m
2026-07-22 KAL836 - Jul 22, 05:00 UTCJul 22, 05:15 UTC15m
2026-07-22 KAL835 ICN → SZX Jul 22, 00:05 UTCJul 22, 00:45 UTC40m
2026-07-21 KAL2012 HKG → ICN Jul 21, 17:05 UTCJul 21, 20:10 UTC3h 5m
2026-07-21 KAL2011 - Jul 21, 11:15 UTCJul 21, 14:15 UTC3h 0m
2026-07-21 KAL622 MNL → ICN Jul 21, 05:05 UTCJul 21, 08:40 UTC3h 35m
2026-07-20 KAL621 ICN → MNL Jul 20, 23:15 UTCJul 21, 02:40 UTC3h 24m
2026-07-20 KAL624 - Jul 20, 15:50 UTCJul 20, 19:20 UTC3h 30m
2026-07-20 KAL623 ICN → MNL Jul 20, 10:20 UTCJul 20, 13:45 UTC3h 25m
2026-07-20 KAL2042 - Jul 20, 07:35 UTCJul 20, 08:00 UTC25m
2026-07-20 KAL2041 ICN → UBN Jul 20, 00:00 UTCJul 20, 06:50 UTC6h 50m
2026-07-19 KAL459 ICN → ICN Jul 19, 10:05 UTCJul 19, 20:35 UTC10h 30m
2026-07-19 KAL2042 - Jul 19, 07:25 UTCJul 19, 07:50 UTC25m
2026-07-19 KAL2041 ICN → UBN Jul 19, 00:05 UTCJul 19, 06:45 UTC6h 40m
2026-07-18 KAL2042 - Jul 18, 07:25 UTCJul 18, 07:45 UTC20m
2026-07-18 KAL2041 ICN → UBN Jul 18, 00:00 UTCJul 18, 01:34 UTC1h 35m
2026-07-17 KAL624 - Jul 17, 16:04 UTCJul 17, 19:49 UTC3h 45m
2026-07-17 KAL623 ICN → MNL Jul 17, 10:44 UTCJul 17, 14:04 UTC3h 20m
2026-07-17 KAL2042 - Jul 17, 07:30 UTCJul 17, 07:50 UTC20m
2026-07-17 KAL2041 - Jul 17, 00:10 UTCJul 17, 01:45 UTC1h 35m
2026-07-16 KAL660 - Jul 16, 05:30 UTCJul 16, 08:35 UTC3h 5m
2026-07-16 KAL660 - Jul 16, 03:15 UTCJul 16, 03:30 UTC15m
2026-07-15 KAL659 - Jul 15, 16:15 UTCJul 15, 16:30 UTC15m
2026-07-15 KAL659 - Jul 15, 11:25 UTCJul 15, 14:10 UTC2h 45m
2026-07-15 KAL2042 - Jul 15, 07:30 UTCJul 15, 07:50 UTC20m
2026-07-15 KAL2041 - Jul 15, 00:00 UTCJul 15, 01:35 UTC1h 35m
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

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 Jul 26, 19:35 UTC.
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, KAL2041, KAL2042, KAL658.