Apparatus

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sensors Mode-S transponder

71BF17

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

Currently assigned to HL7717 · BOEING 737-900

Hex
71BF17
Octal
34337427
Decimal
7,454,487
Country
KR
Tail
HL7717
Type
B739
Broadcasting now · callsign KAL1023 · 3,050 ft
Flights observed
425
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 12:35 UTC

Current position

71BF17 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71BF17 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
KAL1264 Korean Air 17 2026-07-24
KAL1326 Korean Air 15 2026-07-26
KAL1195 - 15 2026-07-24
KAL1118 - 15 2026-07-08
KAL1023 - 14 2026-07-22
KAL1017 - 14 2026-07-15
KAL1330 Korean Air 13 2026-07-19
KAL1073 Korean Air 13 2026-07-21
KAL1576 Korean Air 12 2026-07-26
KAL1227 Korean Air 12 2026-07-10
KAL1570 - 11 2026-07-23
KAL1206 Korean Air 11 2026-07-24
KAL1081 - 11 2026-07-15
KAL1613 - 10 2026-07-15
KAL1294 - 10 2026-07-10
KAL1150 - 10 2026-07-15
KAL2125 - 9 2026-07-05
KAL1575 Korean Air 9 2026-07-26
KAL1569 Korean Air 9 2026-07-23
KAL1178 - 9 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KAL1326 CJU → GMP Jul 26, 11:55 UTCJul 26, 12:35 UTC40m
2026-07-26 KAL1575 TAE → CJU Jul 26, 10:00 UTCJul 26, 10:15 UTC15m
2026-07-26 KAL1576 CJU → TAE Jul 26, 08:25 UTCJul 26, 08:40 UTC15m
2026-07-26 KAL199P ICN → PUS Jul 26, 05:55 UTCJul 26, 06:05 UTC10m
2026-07-26 KAL2072 PVG → PUS Jul 26, 04:20 UTCJul 26, 04:40 UTC20m
2026-07-25 KAL2071 PUS → PVG Jul 25, 23:55 UTCJul 26, 00:10 UTC15m
2026-07-25 KAL2074 - Jul 25, 12:10 UTCJul 25, 12:30 UTC20m
2026-07-25 KAL2073 PUS → PVG Jul 25, 07:00 UTCJul 25, 07:20 UTC20m
2026-07-25 KAL2072 PVG → PUS Jul 25, 04:25 UTCJul 25, 04:50 UTC25m
2026-07-24 KAL2071 PUS → PVG Jul 24, 23:45 UTCJul 25, 00:00 UTC15m
2026-07-24 KAL1558 - Jul 24, 11:55 UTCJul 24, 12:15 UTC20m
2026-07-24 KAL1195 - Jul 24, 09:35 UTCJul 24, 10:10 UTC35m
2026-07-24 KAL1264 CJU → GMP Jul 24, 07:55 UTCJul 24, 08:40 UTC45m
2026-07-24 KAL1141 GMP → CJU Jul 24, 05:40 UTCJul 24, 06:15 UTC35m
2026-07-24 KAL1206 CJU → GMP Jul 24, 03:40 UTCJul 24, 04:20 UTC40m
2026-07-24 KAL1517 PUS → CJU Jul 24, 01:40 UTCJul 24, 01:55 UTC15m
2026-07-24 KAL1512 CJU → PUS Jul 24, 00:20 UTCJul 24, 00:35 UTC15m
2026-07-23 KAL1505 - Jul 23, 22:15 UTCJul 23, 22:20 UTC5m
2026-07-23 KAL1558 - Jul 23, 12:05 UTCJul 23, 12:25 UTC20m
2026-07-23 KAL1195 - Jul 23, 09:30 UTCJul 23, 10:05 UTC35m
2026-07-23 KAL1230 - Jul 23, 05:30 UTCJul 23, 06:10 UTC40m
2026-07-23 KAL1569 TAE → CJU Jul 23, 02:30 UTCJul 23, 02:45 UTC15m
2026-07-23 KAL1570 - Jul 23, 01:00 UTCJul 23, 01:15 UTC15m
2026-07-22 KAL1023 - Jul 22, 22:45 UTCJul 22, 23:20 UTC35m
2026-07-21 KAL1326 - Jul 21, 11:55 UTCJul 21, 12:35 UTC40m
2026-07-21 KAL1165 - Jul 21, 08:10 UTCJul 21, 08:40 UTC30m
2026-07-21 KAL1238 - Jul 21, 06:25 UTCJul 21, 07:05 UTC40m
2026-07-21 KAL1073 GMP → CJU Jul 21, 01:25 UTCJul 21, 02:00 UTC35m
2026-07-19 KAL1330 CJU → GMP Jul 19, 12:15 UTCJul 19, 12:50 UTC35m
2026-07-19 KAL1195 - Jul 19, 09:25 UTCJul 19, 10:00 UTC35m
2026-07-19 KAL1264 - Jul 19, 07:30 UTCJul 19, 08:15 UTC45m
2026-07-19 KAL1141 - Jul 19, 05:25 UTCJul 19, 06:00 UTC35m
2026-07-19 KAL1206 - Jul 19, 03:30 UTCJul 19, 04:05 UTC35m
2026-07-19 KAL1517 - Jul 19, 01:35 UTCJul 19, 01:50 UTC15m
2026-07-19 KAL1512 - Jul 19, 00:25 UTCJul 19, 00:40 UTC15m
2026-07-18 KAL1505 - Jul 18, 22:05 UTCJul 18, 22:15 UTC10m
2026-07-18 KAL2074 - Jul 18, 13:10 UTCJul 18, 13:30 UTC20m
2026-07-18 KAL2073 - Jul 18, 06:55 UTCJul 18, 07:10 UTC15m
2026-07-18 KAL2072 - Jul 18, 04:40 UTCJul 18, 05:05 UTC25m
2026-07-17 KAL2071 - Jul 17, 23:50 UTCJul 18, 00:04 UTC15m
2026-07-17 KAL1558 - Jul 17, 12:10 UTCJul 17, 12:45 UTC35m
2026-07-17 KAL1575 - Jul 17, 10:05 UTCJul 17, 10:20 UTC15m
2026-07-17 KAL1576 - Jul 17, 08:45 UTCJul 17, 08:59 UTC15m
2026-07-17 KAL1612 - Jul 17, 04:39 UTCJul 17, 04:49 UTC10m
2026-07-17 KAL1569 - Jul 17, 02:15 UTCJul 17, 02:30 UTC15m
2026-07-17 KAL1570 - Jul 17, 00:55 UTCJul 17, 01:09 UTC15m
2026-07-16 KAL1023 - Jul 16, 22:40 UTCJul 16, 23:15 UTC35m
2026-07-16 KAL1326 - Jul 16, 11:50 UTCJul 16, 12:25 UTC35m
2026-07-16 KAL1185 GMP → CJU Jul 16, 09:10 UTCJul 16, 09:45 UTC35m
2026-07-16 KAL1230 - Jul 16, 05:40 UTCJul 16, 06:15 UTC35m

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 HL7717 page for operator, model, and routing details .

Mode-S 71BF17 frequently asked

What is Mode-S code 71BF17?
71BF17 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7717.
Where is Mode-S 71BF17 registered?
Mode-S code 71BF17 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 71BF17 broadcasting right now?
Yes. Mode-S 71BF17 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BF17, octal 34337427, decimal 7,454,487.
What flights does 71BF17 operate?
Mode-S 71BF17 has broadcast 20 distinct callsigns, including KAL1264, KAL1326, KAL1195, KAL1118, KAL1023.