Apparatus

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sensors Mode-S transponder

71BC20

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

Currently assigned to HL7420 · BOEING 747-400

Hex
71BC20
Octal
34336040
Decimal
7,453,728
Country
KR
Tail
HL7420
Type
B744
No current signal · last broadcast 10h ago
Flights observed
253
Distinct callsigns
20
Country
KR
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S 71BC20.

Country allocation

The ICAO 24-bit address 71BC20 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
AIH587 - 33 2026-07-13
AIH588 - 21 2026-07-14
AIH244 - 16 2026-07-07
AIH242 - 16 2026-07-01
AIH396 - 13 2026-05-31
AIH248 - 13 2026-07-09
AIH3931 Alpine Air Chile 9 2026-04-26
AIH247 - 8 2026-07-09
AIH775 - 7 2026-07-05
AIH395 - 7 2026-05-31
AIH243 - 7 2026-07-07
AIH969 - 6 2026-07-12
AIH2861 - 6 2026-07-03
AIH241 - 6 2026-07-01
AIH934 - 5 2026-06-18
AIH795 - 5 2026-06-24
AIH776 - 5 2026-07-05
AIH284 Alpine Air Chile 5 2026-04-18
AIH987 - 4 2026-05-19
AIH796 - 4 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 AIH588 - Jul 14, 04:55 UTCJul 14, 05:15 UTC20m
2026-07-13 AIH588 - Jul 13, 18:10 UTCJul 14, 04:10 UTC10h 0m
2026-07-13 AIH587 - Jul 13, 08:50 UTCJul 13, 15:40 UTC6h 50m
2026-07-12 AIH587 ANC → JFK Jul 12, 23:50 UTCJul 13, 06:10 UTC6h 20m
2026-07-12 AIH587 ICN → ANC Jul 12, 14:15 UTCJul 12, 22:00 UTC7h 45m
2026-07-12 AIH970 HKG → ICN Jul 12, 08:10 UTCJul 12, 11:05 UTC2h 55m
2026-07-12 AIH969 - Jul 12, 05:30 UTCJul 12, 05:50 UTC20m
2026-07-12 AIH969 - Jul 12, 02:55 UTCJul 12, 04:55 UTC2h 0m
2026-07-11 AIH588 - Jul 11, 23:10 UTCJul 11, 23:30 UTC20m
2026-07-11 AIH588 - Jul 11, 12:35 UTCJul 11, 22:20 UTC9h 45m
2026-07-11 AIH587 - Jul 11, 03:30 UTCJul 11, 09:55 UTC6h 25m
2026-07-10 AIH587 ANC → JFK Jul 10, 18:10 UTCJul 11, 00:35 UTC6h 25m
2026-07-10 AIH587 - Jul 10, 09:10 UTCJul 10, 16:55 UTC7h 45m
2026-07-09 AIH247 ANC → ICN Jul 9, 21:55 UTCJul 10, 06:00 UTC8h 5m
2026-07-09 AIH247 ATL → ANC Jul 9, 13:45 UTCJul 9, 20:35 UTC6h 50m
2026-07-09 AIH248 - Jul 9, 09:30 UTCJul 9, 11:00 UTC1h 30m
2026-07-09 AIH248 - Jul 9, 01:40 UTCJul 9, 06:55 UTC5h 15m
2026-07-08 AIH248 ICN → ANC Jul 8, 16:30 UTCJul 9, 00:05 UTC7h 35m
2026-07-08 AIH197 NRT → ICN Jul 8, 11:25 UTCJul 8, 13:20 UTC1h 55m
2026-07-08 AIH198 - Jul 8, 07:10 UTCJul 8, 09:05 UTC1h 55m
2026-07-07 AIH243 SEA → ICN Jul 7, 17:10 UTCJul 8, 03:55 UTC10h 45m
2026-07-07 AIH244 DFW → SEA Jul 7, 11:15 UTCJul 7, 14:50 UTC3h 35m
2026-07-07 AIH244 - Jul 7, 07:30 UTCJul 7, 09:15 UTC1h 45m
2026-07-06 AIH244 ANC → ORD Jul 6, 23:25 UTCJul 7, 04:55 UTC5h 30m
2026-07-06 AIH244 ICN → ANC Jul 6, 14:20 UTCJul 6, 21:55 UTC7h 35m
2026-07-05 AIH776 FRA → ICN Jul 5, 10:05 UTCJul 5, 20:40 UTC10h 35m
2026-07-05 AIH775 VIE → FRA Jul 5, 06:35 UTCJul 5, 07:35 UTC1h 0m
2026-07-04 AIH775 ICN → VIE Jul 4, 14:30 UTCJul 5, 04:20 UTC13h 50m
2026-07-03 AIH285 SFO → ICN Jul 3, 11:55 UTCJul 3, 23:40 UTC11h 45m
2026-07-03 AIH2861 - Jul 3, 07:25 UTCJul 3, 08:15 UTC50m
2026-07-02 AIH2861 ANC → LAX Jul 2, 23:45 UTCJul 3, 04:15 UTC4h 30m
2026-07-02 AIH2861 - Jul 2, 14:55 UTCJul 2, 22:25 UTC7h 30m
2026-07-01 AIH241 SEA → ICN Jul 1, 17:15 UTCJul 2, 04:30 UTC11h 15m
2026-07-01 AIH242 DFW → SEA Jul 1, 11:15 UTCJul 1, 14:40 UTC3h 25m
2026-07-01 AIH242 - Jul 1, 07:30 UTCJul 1, 09:15 UTC1h 45m
2026-06-30 AIH242 ANC → ORD Jun 30, 23:00 UTCJul 1, 04:35 UTC5h 35m
2026-06-30 AIH242 - Jun 30, 14:15 UTCJun 30, 21:35 UTC7h 20m
2026-06-30 AIH588 - Jun 30, 04:35 UTCJun 30, 05:00 UTC25m
2026-06-29 AIH588 - Jun 29, 17:40 UTCJun 30, 03:45 UTC10h 6m
2026-06-29 AIH587 JFK → BRU Jun 29, 08:19 UTCJun 29, 14:44 UTC6h 25m
2026-06-28 AIH587 - Jun 28, 23:20 UTCJun 29, 05:30 UTC6h 10m
2026-06-28 AIH587 - Jun 28, 14:14 UTCJun 28, 21:34 UTC7h 20m
2026-06-28 AIH970 HKG → ICN Jun 28, 07:50 UTCJun 28, 10:50 UTC3h 0m
2026-06-28 AIH969 - Jun 28, 03:14 UTCJun 28, 03:29 UTC15m
2026-06-28 AIH969 - Jun 28, 00:35 UTCJun 28, 02:39 UTC2h 5m
2026-06-27 AIH197 - Jun 27, 12:29 UTCJun 27, 14:20 UTC1h 50m
2026-06-27 AIH198 - Jun 27, 07:30 UTCJun 27, 09:44 UTC2h 15m
2026-06-26 AIH241 SEA → ICN Jun 26, 17:40 UTCJun 27, 04:34 UTC10h 55m
2026-06-26 AIH242 DFW → SEA Jun 26, 12:00 UTCJun 26, 15:29 UTC3h 30m
2026-06-26 AIH242 ORD → DFW Jun 26, 07:20 UTCJun 26, 09:20 UTC2h 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 HL7420 page for operator, model, and routing details .

Mode-S 71BC20 frequently asked

What is Mode-S code 71BC20?
71BC20 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7420.
Where is Mode-S 71BC20 registered?
Mode-S code 71BC20 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 71BC20 broadcasting right now?
No active broadcast right now. Last signal was 10h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BC20, octal 34336040, decimal 7,453,728.
What flights does 71BC20 operate?
Mode-S 71BC20 has broadcast 20 distinct callsigns, including AIH587, AIH588, AIH244, AIH242, AIH396.