Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
Broadcasting now · callsign KAL2072 · 4,500 ft
Flights observed
173
Distinct callsigns
20
Country
KR
Last broadcast
2d ago

Current position

71BF27 is currently broadcasting. Map zoomed to live position.

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 9 2026-05-23
KAL1017 Korean Air 9 2026-05-26
KAL1294 Korean Air 8 2026-05-24
KAL1264 Korean Air 8 2026-05-27
KAL1178 Korean Air 8 2026-05-17
KAL1049 Korean Air 8 2026-05-17
KAL1023 Korean Air 8 2026-05-23
KAL1227 Korean Air 7 2026-05-13
KAL1195 Korean Air 7 2026-05-27
KAL1165 Korean Air 7 2026-05-23
KAL1133 Korean Air 7 2026-05-25
KAL1114 Korean Air 7 2026-05-13
KAL1330 Korean Air 6 2026-05-25
KAL1238 Korean Air 6 2026-05-14
KAL1206 Korean Air 6 2026-05-25
KAL1150 Korean Air 6 2026-05-27
KAL1081 Korean Air 6 2026-05-27
KAL2126 Korean Air 5 2026-05-20
KAL2125 Korean Air 5 2026-05-20
KAL1118 Korean Air 5 2026-05-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-27 KAL1195 GMP → CJU May 27, 09:30 UTCMay 27, 09:55 UTC25m
2026-05-27 KAL1264 CJU → GMP May 27, 07:45 UTCMay 27, 08:15 UTC30m
2026-05-27 KAL1081 GMP → CJU May 27, 02:29 UTCMay 27, 02:49 UTC20m
2026-05-27 KAL1150 CJU → GMP May 27, 00:49 UTCMay 27, 01:24 UTC35m
2026-05-26 KAL1017 GMP → CJU May 26, 22:25 UTCMay 26, 22:44 UTC20m
2026-05-26 KAL1264 CJU → GMP May 26, 08:24 UTCMay 26, 09:04 UTC40m
2026-05-26 KAL1709 CJJ → CJU May 26, 02:35 UTCMay 26, 02:49 UTC15m
2026-05-26 KAL1708 CJU → CJJ May 26, 00:49 UTCMay 26, 01:10 UTC20m
2026-05-25 KAL1017 GMP → CJU May 25, 22:19 UTCMay 25, 22:44 UTC25m
2026-05-25 KAL1330 CJU → GMP May 25, 12:25 UTCMay 25, 12:55 UTC30m
2026-05-25 KAL1133 GMP → CJU May 25, 05:20 UTCMay 25, 05:45 UTC25m
2026-05-25 KAL1206 CJU → GMP May 25, 03:40 UTCMay 25, 04:20 UTC40m
2026-05-24 KAL1294 CJU → GMP May 24, 09:45 UTCMay 24, 10:15 UTC30m
2026-05-24 KAL1570 CJU → TAE May 24, 00:55 UTCMay 24, 01:10 UTC15m
2026-05-23 KAL1023 GMP → CJU May 23, 22:40 UTCMay 23, 23:05 UTC25m
2026-05-23 KAL1326 CJU → GMP May 23, 11:55 UTCMay 23, 12:30 UTC35m
2026-05-23 KAL1165 GMP → CJU May 23, 08:30 UTCMay 23, 08:55 UTC25m
2026-05-23 KAL1240 CJU → GMP May 23, 06:50 UTCMay 23, 07:20 UTC30m
2026-05-22 KAL1195 GMP → CJU May 22, 10:15 UTCMay 22, 10:45 UTC30m
2026-05-22 KAL1264 CJU → GMP May 22, 08:35 UTCMay 22, 09:10 UTC35m
2026-05-22 KAL1081 GMP → CJU May 22, 02:35 UTCMay 22, 02:55 UTC20m
2026-05-22 KAL1150 CJU → GMP May 22, 00:45 UTCMay 22, 01:25 UTC40m
2026-05-21 KAL1017 GMP → CJU May 21, 22:30 UTCMay 21, 22:50 UTC20m
2026-05-21 KAL1326 CJU → GMP May 21, 11:50 UTCMay 21, 12:20 UTC30m
2026-05-21 KAL1185 GMP → CJU May 21, 09:10 UTCMay 21, 09:35 UTC25m
2026-05-21 KAL1230 CJU → GMP May 21, 05:45 UTCMay 21, 06:25 UTC40m
2026-05-21 KAL1709 CJJ → CJU May 21, 02:40 UTCMay 21, 02:55 UTC15m
2026-05-21 KAL1708 CJU → CJJ May 21, 00:55 UTCMay 21, 01:20 UTC25m
2026-05-20 KAL1017 GMP → CJU May 20, 22:45 UTCMay 20, 23:10 UTC25m
2026-05-20 KAL1326 CJU → GMP May 20, 11:55 UTCMay 20, 12:30 UTC35m
2026-05-20 KAL2126 NRT → CJU May 20, 08:05 UTCMay 20, 09:20 UTC1h 15m
2026-05-20 KAL2125 CJU → NRT May 20, 04:35 UTCMay 20, 06:10 UTC1h 36m
2026-05-19 KAL1195 GMP → CJU May 19, 09:35 UTCMay 19, 10:00 UTC25m
2026-05-19 KAL1264 CJU → GMP May 19, 08:00 UTCMay 19, 08:25 UTC25m
2026-05-18 KAL1195 GMP → CJU May 18, 09:35 UTCMay 18, 10:00 UTC25m
2026-05-18 KAL1264 CJU → GMP May 18, 08:01 UTCMay 18, 08:25 UTC25m
2026-05-18 KAL1081 GMP → CJU May 18, 02:20 UTCMay 18, 02:45 UTC25m
2026-05-18 KAL1150 CJU → GMP May 18, 00:30 UTCMay 18, 01:05 UTC35m
2026-05-17 KAL1017 GMP → CJU May 17, 22:25 UTCMay 17, 22:50 UTC25m
2026-05-17 KAL1330 CJU → GMP May 17, 12:15 UTCMay 17, 12:45 UTC30m
2026-05-17 KAL1133 GMP → CJU May 17, 05:10 UTCMay 17, 05:40 UTC30m
2026-05-17 KAL1178 CJU → GMP May 17, 02:25 UTCMay 17, 03:00 UTC35m
2026-05-17 KAL1049 GMP → CJU May 17, 00:05 UTCMay 17, 00:30 UTC25m
2026-05-16 KAL1264 CJU → GMP May 16, 07:51 UTCMay 16, 08:20 UTC30m
2026-05-15 KAL2126 NRT → CJU May 15, 08:10 UTCMay 15, 09:20 UTC1h 10m
2026-05-15 KAL2125 CJU → NRT May 15, 04:55 UTCMay 15, 06:40 UTC1h 45m
2026-05-14 KAL1165 GMP → CJU May 14, 08:20 UTCMay 14, 08:50 UTC30m
2026-05-14 KAL1238 CJU → GMP May 14, 06:25 UTCMay 14, 07:00 UTC35m
2026-05-14 KAL1107 GMP → CJU May 14, 04:10 UTCMay 14, 04:45 UTC35m
2026-05-14 KAL1178 CJU → GMP May 14, 02:15 UTCMay 14, 03:05 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?
Yes. Mode-S 71BF27 is currently airborne.
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, KAL1294, KAL1264, KAL1178.