Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 5d ago
Flights observed
220
Distinct callsigns
20
Country
KR
Last broadcast
5d 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
AIH242 - 17 2026-07-15
AIH952 - 16 2026-06-24
AIH587 - 16 2026-07-04
AIH967 - 13 2026-07-09
AIH588 - 9 2026-07-05
AIH969 - 8 2026-06-21
AIH968 - 8 2026-07-09
AIH198 - 7 2026-07-01
AIH197 - 7 2026-07-01
AIH954 - 6 2026-06-07
AIH789 - 6 2026-07-17
AIH396 - 6 2026-07-23
AIH286 - 6 2026-06-26
AIH970 - 5 2026-06-21
AIH951 - 5 2026-06-23
AIH797 - 5 2026-07-13
AIH790 - 5 2026-07-17
AIH2861 Alpine Air Chile 5 2026-07-21
AIH285 - 5 2026-07-22
AIH798 - 4 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AIH248 ANC → ORD Jul 26, 14:20 UTCJul 26, 21:45 UTC7h 25m
2026-07-26 AIH938 - Jul 26, 01:25 UTCJul 26, 08:25 UTC7h 1m
2026-07-25 AIH388 - Jul 25, 04:15 UTCJul 25, 05:05 UTC50m
2026-07-24 AIH387 ICN → HAN Jul 24, 19:20 UTCJul 24, 19:45 UTC25m
2026-07-24 AIH387 ICN → HAN Jul 24, 16:00 UTCJul 24, 16:35 UTC35m
2026-07-24 AIH987 - Jul 24, 00:50 UTCJul 24, 06:40 UTC5h 50m
2026-07-23 AIH396 - Jul 23, 17:25 UTCJul 23, 22:15 UTC4h 50m
2026-07-23 AIH396 - Jul 23, 12:00 UTCJul 23, 13:55 UTC1h 55m
2026-07-23 AIH395 - Jul 23, 03:50 UTCJul 23, 09:35 UTC5h 45m
2026-07-22 AIH285 - Jul 22, 11:10 UTCJul 22, 22:10 UTC11h 0m
2026-07-21 AIH2861 LAX → SFO Jul 21, 23:45 UTCJul 22, 04:40 UTC4h 55m
2026-07-21 AIH2861 LAX → SFO Jul 21, 14:55 UTCJul 21, 22:10 UTC7h 15m
2026-07-20 AIH247 ATL → ANC Jul 20, 19:55 UTCJul 21, 04:15 UTC8h 19m
2026-07-20 AIH247 ATL → ANC Jul 20, 11:50 UTCJul 20, 18:40 UTC6h 50m
2026-07-20 AIH248 ANC → ORD Jul 20, 07:35 UTCJul 20, 08:55 UTC1h 20m
2026-07-19 AIH248 ANC → ORD Jul 19, 23:40 UTCJul 20, 04:55 UTC5h 15m
2026-07-19 AIH248 ANC → ORD Jul 19, 14:35 UTCJul 19, 22:10 UTC7h 35m
2026-07-19 AIH3881 - Jul 19, 07:15 UTCJul 19, 11:05 UTC3h 50m
2026-07-18 AIH3871 ICN → HAN Jul 18, 23:45 UTCJul 19, 02:20 UTC2h 35m
2026-07-17 AIH790 MXP → ICN Jul 17, 12:00 UTCJul 17, 22:29 UTC10h 30m
2026-07-17 AIH789 VIE → MXP Jul 17, 07:30 UTCJul 17, 08:40 UTC1h 10m
2026-07-16 AIH789 - Jul 16, 14:20 UTCJul 17, 04:54 UTC14h 35m
2026-07-15 AIH241 SEA → ICN Jul 15, 19:40 UTCJul 16, 06:05 UTC10h 25m
2026-07-15 AIH242 DFW → SEA Jul 15, 14:05 UTCJul 15, 17:25 UTC3h 20m
2026-07-15 AIH242 - Jul 15, 09:25 UTCJul 15, 11:15 UTC1h 50m
2026-07-15 AIH242 - Jul 15, 01:35 UTCJul 15, 06:50 UTC5h 15m
2026-07-14 AIH242 ICN → ANC Jul 14, 15:40 UTCJul 14, 23:35 UTC7h 54m
2026-07-14 AIH957 ICN → ICN Jul 14, 01:40 UTCJul 14, 09:05 UTC7h 25m
2026-07-13 AIH798 - Jul 13, 20:25 UTCJul 13, 20:50 UTC25m
2026-07-13 AIH798 - Jul 13, 10:15 UTCJul 13, 19:40 UTC9h 25m
2026-07-13 AIH797 VIE → MXP Jul 13, 06:35 UTCJul 13, 07:40 UTC1h 5m
2026-07-12 AIH797 - Jul 12, 15:30 UTCJul 13, 04:20 UTC12h 50m
2026-07-12 AIH797 - Jul 12, 14:25 UTCJul 12, 14:40 UTC15m
2026-07-12 AIH3881 - Jul 12, 10:10 UTCJul 12, 10:35 UTC25m
2026-07-12 AIH3871 - Jul 12, 00:15 UTCJul 12, 00:35 UTC20m
2026-07-10 AIH285 SFO → ICN Jul 10, 10:45 UTCJul 10, 22:10 UTC11h 25m
2026-07-10 AIH2861 - Jul 10, 07:20 UTCJul 10, 08:10 UTC50m
2026-07-10 AIH2861 - Jul 10, 00:15 UTCJul 10, 04:55 UTC4h 40m
2026-07-09 AIH2861 ICN → ANC Jul 9, 15:00 UTCJul 9, 22:35 UTC7h 35m
2026-07-09 AIH968 HKG → ICN Jul 9, 08:30 UTCJul 9, 11:30 UTC3h 0m
2026-07-09 AIH967 - Jul 9, 03:00 UTCJul 9, 06:00 UTC3h 0m
2026-07-05 AIH396 - Jul 5, 16:45 UTCJul 5, 21:35 UTC4h 50m
2026-07-05 AIH396 - Jul 5, 12:20 UTCJul 5, 14:25 UTC2h 5m
2026-07-05 AIH395 - Jul 5, 08:40 UTCJul 5, 09:05 UTC25m
2026-07-05 AIH395 - Jul 5, 03:40 UTCJul 5, 06:00 UTC2h 20m
2026-07-05 AIH588 - Jul 5, 00:25 UTCJul 5, 00:45 UTC20m
2026-07-04 AIH588 - Jul 4, 13:35 UTCJul 4, 23:35 UTC10h 0m
2026-07-04 AIH587 JFK → BRU Jul 4, 04:25 UTCJul 4, 10:45 UTC6h 20m
2026-07-03 AIH587 ANC → JFK Jul 3, 16:45 UTCJul 3, 23:25 UTC6h 40m
2026-07-03 AIH587 - Jul 3, 07:45 UTCJul 3, 15:20 UTC7h 35m

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 5d 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 AIH242, AIH952, AIH587, AIH967, AIH588.