Apparatus

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sensors Mode-S transponder

71BD78

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

Currently assigned to HL7578 · AIRBUS A-350-900

Hex
71BD78
Octal
34336570
Decimal
7,454,072
Country
KR
Tail
HL7578
Type
A359
Broadcasting now · callsign AAR541 · 23,600 ft
Flights observed
257
Distinct callsigns
20
Country
KR
Last broadcast
2h ago

Current position

71BD78 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71BD78 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
AAR542 - 20 2026-06-30
AAR512 - 19 2026-07-09
AAR511 - 19 2026-07-08
AAR501 - 18 2026-07-12
AAR541 - 17 2026-06-29
AAR502 - 16 2026-07-13
AAR751 - 15 2026-07-11
AAR752 - 14 2026-07-11
AAR761 Asiana Airlines 8 2026-06-12
AAR762 - 7 2026-06-12
AAR742 - 7 2026-07-13
AAR521 Asiana Airlines 7 2026-06-10
AAR741 - 6 2026-07-13
AAR522 - 6 2026-06-12
AAR212 - 6 2026-07-04
AAR211 - 6 2026-07-05
AAR734 - 5 2026-07-07
AAR714 - 5 2026-06-19
AAR733 - 4 2026-07-07
AAR713 - 4 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 AAR742 - Jul 13, 21:25 UTCJul 14, 00:15 UTC2h 50m
2026-07-13 AAR742 - Jul 13, 19:15 UTCJul 13, 19:30 UTC15m
2026-07-13 AAR741 - Jul 13, 11:05 UTCJul 13, 13:40 UTC2h 35m
2026-07-13 AAR502 - Jul 13, 04:20 UTCJul 13, 04:40 UTC20m
2026-07-12 AAR502 - Jul 12, 17:30 UTCJul 13, 03:25 UTC9h 55m
2026-07-12 AAR501 - Jul 12, 02:40 UTCJul 12, 14:50 UTC12h 10m
2026-07-12 AAR501 - Jul 12, 01:30 UTCJul 12, 01:45 UTC15m
2026-07-11 AAR752 - Jul 11, 17:30 UTCJul 11, 22:10 UTC4h 40m
2026-07-11 AAR751 - Jul 11, 13:50 UTCJul 11, 14:00 UTC10m
2026-07-11 AAR751 - Jul 11, 07:35 UTCJul 11, 12:20 UTC4h 45m
2026-07-11 AAR502 - Jul 11, 04:50 UTCJul 11, 05:10 UTC20m
2026-07-10 AAR502 - Jul 10, 18:00 UTCJul 11, 04:05 UTC10h 5m
2026-07-10 AAR501 - Jul 10, 02:50 UTCJul 10, 15:10 UTC12h 20m
2026-07-10 AAR501 - Jul 10, 01:30 UTCJul 10, 01:50 UTC20m
2026-07-09 AAR512 - Jul 9, 06:45 UTCJul 9, 07:00 UTC15m
2026-07-08 AAR512 - Jul 8, 19:45 UTCJul 9, 05:50 UTC10h 5m
2026-07-08 AAR511 - Jul 8, 05:10 UTCJul 8, 17:30 UTC12h 20m
2026-07-08 AAR511 - Jul 8, 03:55 UTCJul 8, 04:10 UTC15m
2026-07-07 AAR734 - Jul 7, 19:55 UTCJul 7, 20:40 UTC45m
2026-07-07 AAR734 - Jul 7, 16:55 UTCJul 7, 17:05 UTC10m
2026-07-07 AAR733 - Jul 7, 10:55 UTCJul 7, 14:50 UTC3h 55m
2026-07-07 AAR512 BCN → ICN Jul 7, 07:05 UTCJul 7, 07:35 UTC30m
2026-07-06 AAR512 BCN → ICN Jul 6, 20:05 UTCJul 7, 00:10 UTC4h 5m
2026-07-06 AAR511 - Jul 6, 05:25 UTCJul 6, 17:30 UTC12h 5m
2026-07-06 AAR511 - Jul 6, 04:10 UTCJul 6, 04:30 UTC20m
2026-07-05 AAR211 - Jul 5, 09:30 UTCJul 5, 20:55 UTC11h 25m
2026-07-04 AAR212 ICN → SFO Jul 4, 12:20 UTCJul 4, 22:30 UTC10h 10m
2026-07-04 AAR502 - Jul 4, 04:15 UTCJul 4, 04:40 UTC25m
2026-07-03 AAR502 - Jul 3, 17:30 UTCJul 4, 03:30 UTC10h 0m
2026-07-03 AAR501 - Jul 3, 02:45 UTCJul 3, 14:50 UTC12h 5m
2026-07-03 AAR501 - Jul 3, 01:30 UTCJul 3, 01:50 UTC20m
2026-07-02 AAR512 BCN → ICN Jul 2, 06:51 UTCJul 2, 07:10 UTC19m
2026-07-01 AAR512 BCN → ICN Jul 1, 19:40 UTCJul 2, 00:00 UTC4h 20m
2026-07-01 AAR511 ICN → BCN Jul 1, 03:20 UTCJul 1, 16:25 UTC13h 5m
2026-06-30 AAR734 - Jun 30, 17:00 UTCJun 30, 20:30 UTC3h 30m
2026-06-30 AAR733 - Jun 30, 11:00 UTCJun 30, 14:55 UTC3h 55m
2026-06-30 AAR542 - Jun 30, 04:55 UTCJun 30, 05:15 UTC20m
2026-06-29 AAR542 - Jun 29, 18:19 UTCJun 30, 04:05 UTC9h 45m
2026-06-29 AAR541 - Jun 29, 03:25 UTCJun 29, 15:04 UTC11h 40m
2026-06-29 AAR541 - Jun 29, 02:14 UTCJun 29, 02:30 UTC15m
2026-06-28 AAR752 SIN → ICN Jun 28, 18:14 UTCJun 28, 21:14 UTC3h 0m
2026-06-28 AAR751 - Jun 28, 07:50 UTCJun 28, 13:25 UTC5h 35m
2026-06-28 AAR542 - Jun 28, 04:25 UTCJun 28, 04:44 UTC20m
2026-06-27 AAR542 - Jun 27, 17:59 UTCJun 28, 03:29 UTC9h 30m
2026-06-27 AAR541 - Jun 27, 02:14 UTCJun 27, 15:14 UTC13h 0m
2026-06-26 AAR742 - Jun 26, 18:44 UTCJun 26, 23:39 UTC4h 55m
2026-06-26 AAR741 ICN → BKK Jun 26, 11:14 UTCJun 26, 16:05 UTC4h 50m
2026-06-25 AAR201 LAX → ICN Jun 25, 17:39 UTCJun 26, 06:15 UTC12h 35m
2026-06-25 AAR202 ICN → LAX Jun 25, 04:04 UTCJun 25, 14:14 UTC10h 10m
2026-06-24 AAR734 - Jun 24, 16:50 UTCJun 24, 20:35 UTC3h 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 HL7578 page for operator, model, and routing details .

Mode-S 71BD78 frequently asked

What is Mode-S code 71BD78?
71BD78 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7578.
Where is Mode-S 71BD78 registered?
Mode-S code 71BD78 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 71BD78 broadcasting right now?
Yes. Mode-S 71BD78 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BD78, octal 34336570, decimal 7,454,072.
What flights does 71BD78 operate?
Mode-S 71BD78 has broadcast 20 distinct callsigns, including AAR542, AAR512, AAR511, AAR501, AAR541.