Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71BF25

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

Currently assigned to HL7725 · BOEING 737-900

Hex
71BF25
Octal
34337445
Decimal
7,454,501
Country
KR
Tail
HL7725
Type
B739
No current signal · last broadcast 9h ago
Flights observed
146
Distinct callsigns
20
Country
KR
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S 71BF25.

Country allocation

The ICAO 24-bit address 71BF25 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
KAL2126 Korean Air 7 2026-05-25
KAL2125 Korean Air 7 2026-05-25
KAL1195 Korean Air 7 2026-05-21
KAL1114 Korean Air 7 2026-05-14
KAL1023 Korean Air 7 2026-05-29
KAL1326 Korean Air 6 2026-05-13
KAL1073 Korean Air 6 2026-05-28
KAL1330 Korean Air 5 2026-05-28
KAL1294 Korean Air 5 2026-05-29
KAL1264 Korean Air 5 2026-05-21
KAL1206 Korean Air 5 2026-05-28
KAL1178 Korean Air 5 2026-05-15
KAL1165 Korean Air 5 2026-05-15
KAL1107 Korean Air 5 2026-05-15
KAL1049 Korean Air 5 2026-05-15
KAL1240 Korean Air 4 2026-05-26
KAL1238 Korean Air 4 2026-05-15
KAL1227 Korean Air 4 2026-05-17
KAL1185 Korean Air 4 2026-05-26
KAL1133 Korean Air 4 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 KAL1023 GMP → CJU May 29, 22:40 UTCMay 29, 23:05 UTC25m
2026-05-29 KAL1294 CJU → GMP May 29, 09:50 UTCMay 29, 10:20 UTC30m
2026-05-28 KAL1023 GMP → CJU May 28, 22:40 UTCMay 28, 23:00 UTC20m
2026-05-28 KAL1330 CJU → GMP May 28, 12:20 UTCMay 28, 12:50 UTC30m
2026-05-28 KAL1141 GMP → CJU May 28, 05:35 UTCMay 28, 06:00 UTC25m
2026-05-28 KAL1206 CJU → GMP May 28, 03:50 UTCMay 28, 04:20 UTC30m
2026-05-28 KAL1073 GMP → CJU May 28, 01:25 UTCMay 28, 01:45 UTC20m
2026-05-26 KAL1330 CJU → GMP May 26, 12:20 UTCMay 26, 12:50 UTC30m
2026-05-26 KAL1185 GMP → CJU May 26, 08:59 UTCMay 26, 09:25 UTC25m
2026-05-26 KAL1240 CJU → GMP May 26, 06:44 UTCMay 26, 07:10 UTC25m
2026-05-25 KAL2126 NRT → CJU May 25, 07:45 UTCMay 25, 09:00 UTC1h 15m
2026-05-25 KAL2125 CJU → NRT May 25, 04:40 UTCMay 25, 06:25 UTC1h 45m
2026-05-23 KAL2061 PUS → PEK May 23, 13:20 UTCMay 23, 21:00 UTC7h 41m
2026-05-21 KAL1195 GMP → CJU May 21, 09:40 UTCMay 21, 10:05 UTC25m
2026-05-21 KAL1264 CJU → GMP May 21, 08:00 UTCMay 21, 08:30 UTC30m
2026-05-20 KAL1195 GMP → CJU May 20, 09:40 UTCMay 20, 10:05 UTC25m
2026-05-20 KAL1264 CJU → GMP May 20, 07:40 UTCMay 20, 08:15 UTC35m
2026-05-20 KAL1081 GMP → CJU May 20, 02:25 UTCMay 20, 02:55 UTC30m
2026-05-20 KAL1150 CJU → GMP May 20, 00:45 UTCMay 20, 01:20 UTC35m
2026-05-19 KAL1017 GMP → CJU May 19, 22:30 UTCMay 19, 22:55 UTC25m
2026-05-18 KAL1330 CJU → GMP May 18, 12:35 UTCMay 18, 13:05 UTC30m
2026-05-18 KAL1133 GMP → CJU May 18, 05:20 UTCMay 18, 05:45 UTC25m
2026-05-18 KAL1206 CJU → GMP May 18, 03:40 UTCMay 18, 04:00 UTC20m
2026-05-18 KAL1073 GMP → CJU May 18, 01:20 UTCMay 18, 01:45 UTC25m
2026-05-17 KAL1118 CJU → GMP May 17, 22:25 UTCMay 17, 23:00 UTC35m
2026-05-17 KAL1227 GMP → CJU May 17, 11:40 UTCMay 17, 12:05 UTC25m
2026-05-17 KAL1294 CJU → GMP May 17, 09:50 UTCMay 17, 10:20 UTC30m
2026-05-16 KAL1023 GMP → CJU May 16, 22:45 UTCMay 16, 23:10 UTC25m
2026-05-16 KAL1330 CJU → GMP May 16, 12:21 UTCMay 16, 12:45 UTC25m
2026-05-16 KAL1133 GMP → CJU May 16, 05:35 UTCMay 16, 05:56 UTC21m
2026-05-16 KAL1206 CJU → GMP May 16, 03:50 UTCMay 16, 04:25 UTC35m
2026-05-16 KAL1073 GMP → CJU May 16, 01:35 UTCMay 16, 01:55 UTC20m
2026-05-15 KAL1118 CJU → GMP May 15, 22:30 UTCMay 15, 23:00 UTC30m
2026-05-15 KAL1165 GMP → CJU May 15, 08:25 UTCMay 15, 08:50 UTC25m
2026-05-15 KAL1238 CJU → GMP May 15, 06:55 UTCMay 15, 07:25 UTC30m
2026-05-15 KAL1107 GMP → CJU May 15, 04:15 UTCMay 15, 04:40 UTC25m
2026-05-15 KAL1178 CJU → GMP May 15, 02:30 UTCMay 15, 03:00 UTC30m
2026-05-15 KAL1049 GMP → CJU May 15, 00:10 UTCMay 15, 00:35 UTC25m
2026-05-14 KAL1114 CJU → GMP May 14, 22:20 UTCMay 14, 22:55 UTC35m
2026-05-14 KAL1227 GMP → CJU May 14, 11:40 UTCMay 14, 12:10 UTC30m
2026-05-14 KAL1294 CJU → GMP May 14, 09:45 UTCMay 14, 10:25 UTC40m
2026-05-14 KAL1147 GMP → CJU May 14, 06:55 UTCMay 14, 07:25 UTC30m
2026-05-14 KAL1218 CJU → GMP May 14, 04:50 UTCMay 14, 05:30 UTC40m
2026-05-14 KAL1570 CJU → TAE May 14, 01:00 UTCMay 14, 01:10 UTC10m
2026-05-13 KAL1023 GMP → CJU May 13, 22:35 UTCMay 13, 23:10 UTC35m
2026-05-13 KAL1326 CJU → GMP May 13, 11:50 UTCMay 13, 12:30 UTC40m
2026-05-13 KAL2126 NRT → CJU May 13, 08:00 UTCMay 13, 09:15 UTC1h 15m
2026-05-13 KAL2125 CJU → NRT May 13, 04:30 UTCMay 13, 06:05 UTC1h 35m
2026-05-13 KAL1073 GMP → CJU May 13, 01:25 UTCMay 13, 01:55 UTC30m
2026-05-12 KAL1118 CJU → GMP May 12, 22:25 UTCMay 12, 23:05 UTC40m

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 HL7725 page for operator, model, and routing details .

Mode-S 71BF25 frequently asked

What is Mode-S code 71BF25?
71BF25 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7725.
Where is Mode-S 71BF25 registered?
Mode-S code 71BF25 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 71BF25 broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BF25, octal 34337445, decimal 7,454,501.
What flights does 71BF25 operate?
Mode-S 71BF25 has broadcast 20 distinct callsigns, including KAL2126, KAL2125, KAL1195, KAL1114, KAL1023.