Apparatus

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sensors Mode-S transponder

71BF27

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

Currently assigned to HL7727 · BOEING 737-900

Hex
71BF27
Octal
34337447
Decimal
7,454,503
Country
KR
Tail
HL7727
Type
B739
No current signal · last broadcast 1h ago
Flights observed
357
Distinct callsigns
20
Country
KR
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 71BF27.

Country allocation

The ICAO 24-bit address 71BF27 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
KAL1326 Korean Air 14 2026-07-09
KAL1017 - 14 2026-07-12
KAL1264 - 13 2026-06-24
KAL1195 - 12 2026-06-24
KAL1165 - 12 2026-07-05
KAL2126 - 11 2026-07-08
KAL2125 - 11 2026-07-08
KAL1330 Korean Air 11 2026-07-12
KAL1294 - 11 2026-07-13
KAL1238 - 10 2026-07-05
KAL1227 Korean Air 10 2026-07-13
KAL1178 - 10 2026-07-05
KAL1150 - 10 2026-07-13
KAL1118 - 10 2026-07-13
KAL1073 - 10 2026-07-14
KAL1049 - 10 2026-07-05
KAL1023 - 10 2026-07-10
KAL1114 - 9 2026-07-04
KAL1107 - 9 2026-07-05
KAL1081 - 9 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 KAL1147 - Jul 14, 06:35 UTCJul 14, 07:10 UTC35m
2026-07-14 KAL1218 - Jul 14, 04:50 UTCJul 14, 05:30 UTC40m
2026-07-14 KAL1073 - Jul 14, 01:25 UTCJul 14, 02:00 UTC35m
2026-07-13 KAL1118 - Jul 13, 22:15 UTCJul 13, 22:55 UTC40m
2026-07-13 KAL1227 GMP → CJU Jul 13, 11:45 UTCJul 13, 12:20 UTC35m
2026-07-13 KAL1294 - Jul 13, 09:45 UTCJul 13, 10:25 UTC40m
2026-07-13 KAL1081 - Jul 13, 02:50 UTCJul 13, 03:25 UTC35m
2026-07-13 KAL1150 - Jul 13, 01:05 UTCJul 13, 01:45 UTC40m
2026-07-12 KAL1017 - Jul 12, 22:25 UTCJul 12, 23:05 UTC40m
2026-07-12 KAL1330 CJU → GMP Jul 12, 13:05 UTCJul 12, 13:35 UTC30m
2026-07-12 KAL1575 - Jul 12, 10:55 UTCJul 12, 11:10 UTC15m
2026-07-12 KAL1576 - Jul 12, 09:20 UTCJul 12, 09:35 UTC15m
2026-07-12 KAL1613 - Jul 12, 07:10 UTCJul 12, 07:20 UTC10m
2026-07-12 KAL1614 - Jul 12, 06:01 UTCJul 12, 06:10 UTC10m
2026-07-12 KAL1073 - Jul 12, 03:20 UTCJul 12, 03:55 UTC35m
2026-07-12 KAL1118 - Jul 12, 01:20 UTCJul 12, 02:01 UTC40m
2026-07-11 KAL1227 GMP → CJU Jul 11, 12:35 UTCJul 11, 13:10 UTC35m
2026-07-11 KAL1294 - Jul 11, 11:00 UTCJul 11, 11:30 UTC30m
2026-07-11 KAL1569 - Jul 11, 02:15 UTCJul 11, 02:30 UTC15m
2026-07-11 KAL1570 - Jul 11, 00:50 UTCJul 11, 01:10 UTC20m
2026-07-10 KAL1023 - Jul 10, 22:40 UTCJul 10, 23:15 UTC35m
2026-07-10 KAL2120 KIX → GMP Jul 10, 11:10 UTCJul 10, 12:35 UTC1h 25m
2026-07-10 KAL2119 GMP → KIX Jul 10, 08:10 UTCJul 10, 09:35 UTC1h 25m
2026-07-09 KAL1326 CJU → GMP Jul 9, 11:50 UTCJul 9, 12:25 UTC35m
2026-07-09 KAL1575 - Jul 9, 09:55 UTCJul 9, 10:10 UTC15m
2026-07-09 KAL1576 - Jul 9, 08:05 UTCJul 9, 08:20 UTC15m
2026-07-09 KAL1709 - Jul 9, 02:25 UTCJul 9, 03:00 UTC35m
2026-07-09 KAL1708 - Jul 9, 00:40 UTCJul 9, 01:15 UTC35m
2026-07-08 KAL1017 - Jul 8, 22:20 UTCJul 8, 23:00 UTC40m
2026-07-08 KAL1330 CJU → GMP Jul 8, 12:10 UTCJul 8, 12:55 UTC45m
2026-07-08 KAL2126 - Jul 8, 08:00 UTCJul 8, 09:35 UTC1h 35m
2026-07-08 KAL2125 - Jul 8, 04:20 UTCJul 8, 06:20 UTC2h 0m
2026-07-08 KAL1517 - Jul 8, 01:40 UTCJul 8, 01:55 UTC15m
2026-07-08 KAL1512 - Jul 8, 00:15 UTCJul 8, 00:35 UTC20m
2026-07-07 KAL1505 - Jul 7, 22:10 UTCJul 7, 22:25 UTC15m
2026-07-07 KAL2072 - Jul 7, 04:15 UTCJul 7, 04:30 UTC15m
2026-07-06 KAL2071 - Jul 6, 23:40 UTCJul 6, 23:50 UTC10m
2026-07-06 KAL2062 - Jul 6, 20:30 UTCJul 6, 21:35 UTC1h 5m
2026-07-06 KAL2061 PUS → PEK Jul 6, 13:15 UTCJul 6, 14:00 UTC45m
2026-07-06 KAL1409 - Jul 6, 11:05 UTCJul 6, 11:45 UTC40m
2026-07-06 KAL844 - Jul 6, 08:40 UTCJul 6, 09:10 UTC30m
2026-07-06 KAL843 - Jul 6, 05:15 UTCJul 6, 05:30 UTC15m
2026-07-05 KAL1404 - Jul 5, 23:05 UTCJul 5, 23:55 UTC50m
2026-07-05 KAL1558 - Jul 5, 12:25 UTCJul 5, 12:55 UTC30m
2026-07-05 KAL1165 - Jul 5, 08:50 UTCJul 5, 09:25 UTC35m
2026-07-05 KAL1238 - Jul 5, 06:50 UTCJul 5, 07:35 UTC45m
2026-07-05 KAL1107 - Jul 5, 04:25 UTCJul 5, 04:55 UTC30m
2026-07-05 KAL1178 - Jul 5, 02:35 UTCJul 5, 03:15 UTC40m
2026-07-05 KAL1049 - Jul 5, 00:10 UTCJul 5, 00:45 UTC35m
2026-07-04 KAL1114 - Jul 4, 22:20 UTCJul 4, 23:10 UTC50m

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 HL7727 page for operator, model, and routing details .

Mode-S 71BF27 frequently asked

What is Mode-S code 71BF27?
71BF27 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7727.
Where is Mode-S 71BF27 registered?
Mode-S code 71BF27 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 71BF27 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BF27, octal 34337447, decimal 7,454,503.
What flights does 71BF27 operate?
Mode-S 71BF27 has broadcast 20 distinct callsigns, including KAL1326, KAL1017, KAL1264, KAL1195, KAL1165.