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 Jul 26, 15:30 UTC
Flights observed
280
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 15:30 UTC

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
AIH969 - 9 2026-07-26
AIH775 - 9 2026-07-19
AIH3931 Alpine Air Chile 9 2026-04-26
AIH2861 Alpine Air Chile 9 2026-07-24
AIH247 - 8 2026-07-09
AIH934 - 7 2026-07-16
AIH395 - 7 2026-05-31
AIH243 - 7 2026-07-07
AIH794 - 6 2026-07-18
AIH793 Alpine Air Chile 6 2026-07-17
AIH776 - 6 2026-07-19
AIH241 - 6 2026-07-01
AIH987 - 5 2026-07-22
AIH970 - 5 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AIH970 - Jul 26, 12:30 UTCJul 26, 15:30 UTC3h 0m
2026-07-26 AIH969 - Jul 26, 08:35 UTCJul 26, 08:50 UTC15m
2026-07-26 AIH969 - Jul 26, 05:35 UTCJul 26, 07:55 UTC2h 21m
2026-07-25 AIH958 - Jul 25, 01:35 UTCJul 25, 07:30 UTC5h 55m
2026-07-24 AIH285 SFO → ICN Jul 24, 10:55 UTCJul 24, 21:50 UTC10h 55m
2026-07-24 AIH2861 LAX → SFO Jul 24, 07:20 UTCJul 24, 08:15 UTC55m
2026-07-23 AIH2861 LAX → SFO Jul 23, 23:45 UTCJul 24, 04:20 UTC4h 35m
2026-07-23 AIH2861 LAX → SFO Jul 23, 15:00 UTCJul 23, 22:10 UTC7h 10m
2026-07-23 AIH968 HKG → ICN Jul 23, 06:00 UTCJul 23, 09:05 UTC3h 5m
2026-07-23 AIH967 ICN → HKG Jul 23, 00:40 UTCJul 23, 03:30 UTC2h 50m
2026-07-22 AIH987 - Jul 22, 01:55 UTCJul 22, 02:30 UTC35m
2026-07-21 AIH283 SFO → ICN Jul 21, 11:50 UTCJul 21, 23:05 UTC11h 15m
2026-07-21 AIH2841 ANC → LAX Jul 21, 08:15 UTCJul 21, 09:05 UTC50m
2026-07-21 AIH2841 ANC → LAX Jul 21, 00:45 UTCJul 21, 05:35 UTC4h 50m
2026-07-20 AIH2841 ANC → LAX Jul 20, 14:55 UTCJul 20, 23:15 UTC8h 20m
2026-07-19 AIH776 FRA → ICN Jul 19, 10:20 UTCJul 19, 20:50 UTC10h 30m
2026-07-19 AIH775 VIE → FRA Jul 19, 06:15 UTCJul 19, 07:20 UTC1h 5m
2026-07-18 AIH775 - Jul 18, 14:20 UTCJul 19, 04:05 UTC13h 45m
2026-07-18 AIH794 - Jul 18, 00:19 UTCJul 18, 00:39 UTC20m
2026-07-17 AIH794 - Jul 17, 13:55 UTCJul 17, 23:35 UTC9h 40m
2026-07-17 AIH793 STN → FRA Jul 17, 08:59 UTCJul 17, 10:05 UTC1h 5m
2026-07-16 AIH793 STN → FRA Jul 16, 14:55 UTCJul 17, 06:45 UTC15h 50m
2026-07-16 AIH934 - Jul 16, 04:20 UTCJul 16, 05:00 UTC40m
2026-07-15 AIH934 - Jul 15, 22:20 UTCJul 15, 22:30 UTC10m
2026-07-15 AIH933 - Jul 15, 16:05 UTCJul 15, 16:40 UTC35m
2026-07-15 AIH970 HKG → ICN Jul 15, 07:15 UTCJul 15, 10:20 UTC3h 5m
2026-07-15 AIH969 ICN → HKG Jul 15, 00:30 UTCJul 15, 03:35 UTC3h 5m
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

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 Jul 26, 15:30 UTC.
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.