Apparatus

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sensors Mode-S transponder

71BC23

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

Currently assigned to HL7423 · BOEING 747-400

Hex
71BC23
Octal
34336043
Decimal
7,453,731
Country
KR
Tail
HL7423
Type
B744
No current signal · last broadcast 2h ago
Flights observed
120
Distinct callsigns
20
Country
KR
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 71BC23.

Country allocation

The ICAO 24-bit address 71BC23 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
AIH952 - 13 2026-06-17
AIH587 - 13 2026-06-15
AIH242 Alpine Air Chile 8 2026-05-28
AIH588 Alpine Air Chile 7 2026-06-16
AIH969 - 6 2026-06-14
AIH967 - 6 2026-06-09
AIH954 - 6 2026-06-07
AIH970 - 4 2026-06-14
AIH951 - 4 2026-06-16
AIH790 - 4 2026-06-12
AIH789 - 4 2026-06-12
AIH286 Alpine Air Chile 4 2026-05-22
AIH198 - 4 2026-05-30
AIH197 - 4 2026-05-30
AIH968 - 3 2026-06-09
AIH958 - 3 2026-06-16
AIH282 Alpine Air Chile 3 2026-06-07
AIH281 Alpine Air Chile 3 2026-06-08
AIH988 - 2 2026-05-28
AIH953 - 2 2026-06-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-17 AIH952 - Jun 17, 06:50 UTCJun 17, 07:20 UTC30m
2026-06-17 AIH952 - Jun 17, 04:20 UTCJun 17, 05:35 UTC1h 15m
2026-06-17 AIH952 - Jun 17, 00:40 UTCJun 17, 01:15 UTC35m
2026-06-16 AIH952 - Jun 16, 23:40 UTCJun 17, 00:00 UTC20m
2026-06-16 AIH951 - Jun 16, 17:30 UTCJun 16, 21:05 UTC3h 36m
2026-06-16 AIH958 - Jun 16, 08:30 UTCJun 16, 15:05 UTC6h 35m
2026-06-16 AIH588 BRU → ICN Jun 16, 05:15 UTCJun 16, 05:40 UTC25m
2026-06-15 AIH588 BRU → ICN Jun 15, 18:25 UTCJun 15, 22:25 UTC4h 0m
2026-06-15 AIH587 JFK → BRU Jun 15, 09:10 UTCJun 15, 15:35 UTC6h 25m
2026-06-15 AIH587 ANC → JFK Jun 15, 00:10 UTCJun 15, 06:45 UTC6h 35m
2026-06-14 AIH587 - Jun 14, 14:15 UTCJun 14, 22:00 UTC7h 45m
2026-06-14 AIH970 HKG → ICN Jun 14, 06:35 UTCJun 14, 09:35 UTC3h 0m
2026-06-14 AIH969 ICN → HKG Jun 14, 00:35 UTCJun 14, 03:45 UTC3h 10m
2026-06-12 AIH790 - Jun 12, 21:25 UTCJun 12, 21:45 UTC20m
2026-06-12 AIH790 - Jun 12, 10:40 UTCJun 12, 20:40 UTC10h 0m
2026-06-12 AIH789 VIE → MXP Jun 12, 06:40 UTCJun 12, 07:45 UTC1h 5m
2026-06-11 AIH789 - Jun 11, 14:30 UTCJun 12, 04:35 UTC14h 5m
2026-06-11 AIH588 BRU → ICN Jun 11, 04:55 UTCJun 11, 05:15 UTC20m
2026-06-10 AIH588 BRU → ICN Jun 10, 17:40 UTCJun 11, 04:00 UTC10h 20m
2026-06-10 AIH587 ANC → JFK Jun 10, 08:15 UTCJun 10, 14:40 UTC6h 25m
2026-06-09 AIH587 ANC → JFK Jun 9, 23:10 UTCJun 10, 05:35 UTC6h 25m
2026-06-09 AIH587 ANC → JFK Jun 9, 14:25 UTCJun 9, 21:35 UTC7h 10m
2026-06-09 AIH968 HKG → ICN Jun 9, 06:15 UTCJun 9, 09:05 UTC2h 50m
2026-06-09 AIH967 - Jun 9, 03:20 UTCJun 9, 03:40 UTC20m
2026-06-09 AIH967 - Jun 9, 00:25 UTCJun 9, 02:45 UTC2h 20m
2026-06-08 AIH281 LAX → ICN Jun 8, 04:50 UTCJun 8, 17:40 UTC12h 50m
2026-06-07 AIH282 ICN → LAX Jun 7, 14:45 UTCJun 8, 01:10 UTC10h 25m
2026-06-07 AIH954 - Jun 7, 02:35 UTCJun 7, 04:40 UTC2h 5m
2026-06-07 AIH954 - Jun 7, 01:50 UTCJun 7, 02:00 UTC10m
2026-06-06 AIH954 - Jun 6, 22:34 UTCJun 6, 23:00 UTC25m
2026-06-06 AIH954 - Jun 6, 21:40 UTCJun 6, 21:54 UTC15m
2026-06-06 AIH953 - Jun 6, 15:15 UTCJun 6, 19:04 UTC3h 50m
2026-06-06 AIH952 - Jun 6, 02:30 UTCJun 6, 04:30 UTC2h 0m
2026-06-06 AIH952 - Jun 6, 01:35 UTCJun 6, 01:50 UTC15m
2026-06-05 AIH952 - Jun 5, 22:30 UTCJun 5, 23:10 UTC40m
2026-06-05 AIH952 - Jun 5, 21:30 UTCJun 5, 21:50 UTC20m
2026-06-05 AIH951 - Jun 5, 15:15 UTCJun 5, 19:00 UTC3h 45m
2026-06-05 AIH970 HKG → ICN Jun 5, 06:10 UTCJun 5, 09:10 UTC3h 0m
2026-06-05 AIH969 - Jun 5, 03:15 UTCJun 5, 03:25 UTC10m
2026-06-05 AIH969 - Jun 5, 00:20 UTCJun 5, 02:40 UTC2h 20m
2026-06-03 AIH796 FRA → ICN Jun 3, 20:55 UTCJun 3, 21:20 UTC25m
2026-06-03 AIH796 FRA → ICN Jun 3, 10:25 UTCJun 3, 20:05 UTC9h 40m
2026-06-03 AIH795 VIE → FRA Jun 3, 06:45 UTCJun 3, 07:45 UTC1h 0m
2026-06-02 AIH795 VIE → FRA Jun 2, 14:15 UTCJun 3, 04:35 UTC14h 20m
2026-06-02 AIH968 HKG → ICN Jun 2, 06:00 UTCJun 2, 09:00 UTC3h 0m
2026-06-02 AIH967 - Jun 2, 03:00 UTCJun 2, 03:20 UTC20m
2026-06-02 AIH967 - Jun 2, 00:25 UTCJun 2, 02:30 UTC2h 5m
2026-06-01 AIH281 LAX → ICN Jun 1, 04:35 UTCJun 1, 16:20 UTC11h 45m
2026-05-31 AIH282 ICN → LAX May 31, 14:50 UTCJun 1, 01:25 UTC10h 35m
2026-05-31 AIH970 HKG → ICN May 31, 00:05 UTCMay 31, 11:45 UTC11h 40m

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 HL7423 page for operator, model, and routing details .

Mode-S 71BC23 frequently asked

What is Mode-S code 71BC23?
71BC23 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7423.
Where is Mode-S 71BC23 registered?
Mode-S code 71BC23 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 71BC23 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BC23, octal 34336043, decimal 7,453,731.
What flights does 71BC23 operate?
Mode-S 71BC23 has broadcast 20 distinct callsigns, including AIH952, AIH587, AIH242, AIH588, AIH969.