Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71BF28

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

Currently assigned to HL7728 · BOEING 737-900

Hex
71BF28
Octal
34337450
Decimal
7,454,504
Country
KR
Tail
HL7728
Type
B739
No current signal · last broadcast 14d ago
Flights observed
311
Distinct callsigns
20
Country
KR
Last broadcast
14d ago

Last known position

Most recent position reported by Mode-S 71BF28.

Country allocation

The ICAO 24-bit address 71BF28 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
KAL1049 - 16 2026-06-20
KAL1178 - 15 2026-06-20
KAL1114 - 15 2026-06-19
KAL1107 - 15 2026-06-20
KAL1330 Korean Air 14 2026-06-27
KAL1238 - 14 2026-06-20
KAL1165 - 14 2026-06-20
KAL1017 - 14 2026-06-27
KAL1326 Korean Air 13 2026-06-20
KAL1023 - 13 2026-06-28
KAL1576 - 10 2026-06-27
KAL1294 Korean Air 9 2026-06-07
KAL1709 - 8 2026-06-27
KAL1575 - 8 2026-06-27
KAL1708 - 7 2026-06-27
KAL1613 - 7 2026-06-27
KAL1227 Korean Air 7 2026-06-19
KAL1206 Korean Air 7 2026-06-03
KAL1195 - 7 2026-06-14
KAL1570 - 6 2026-06-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-29 KAL1214 - Jun 29, 04:30 UTCJun 29, 05:04 UTC35m
2026-06-29 KAL1569 - Jun 29, 02:25 UTCJun 29, 02:35 UTC10m
2026-06-29 KAL1570 - Jun 29, 00:54 UTCJun 29, 01:20 UTC25m
2026-06-28 KAL1023 - Jun 28, 22:34 UTCJun 28, 23:09 UTC35m
2026-06-28 KAL1272 - Jun 28, 08:34 UTCJun 28, 09:15 UTC40m
2026-06-28 KAL1081 - Jun 28, 02:25 UTCJun 28, 03:00 UTC35m
2026-06-28 KAL1150 - Jun 28, 00:25 UTCJun 28, 01:10 UTC45m
2026-06-27 KAL1017 - Jun 27, 22:20 UTCJun 27, 22:55 UTC35m
2026-06-27 KAL1330 CJU → GMP Jun 27, 12:15 UTCJun 27, 12:50 UTC35m
2026-06-27 KAL1575 - Jun 27, 09:50 UTCJun 27, 10:00 UTC10m
2026-06-27 KAL1576 - Jun 27, 08:14 UTCJun 27, 08:39 UTC25m
2026-06-27 KAL1613 - Jun 27, 05:49 UTCJun 27, 06:05 UTC15m
2026-06-27 KAL1614 - Jun 27, 04:34 UTCJun 27, 04:44 UTC10m
2026-06-27 KAL1709 - Jun 27, 02:25 UTCJun 27, 02:50 UTC25m
2026-06-27 KAL1708 - Jun 27, 00:34 UTCJun 27, 01:04 UTC30m
2026-06-26 KAL1017 - Jun 26, 22:14 UTCJun 26, 22:49 UTC35m
2026-06-26 KAL1330 CJU → GMP Jun 26, 12:10 UTCJun 26, 12:50 UTC40m
2026-06-26 KAL1575 - Jun 26, 09:55 UTCJun 26, 10:05 UTC10m
2026-06-26 KAL1576 - Jun 26, 08:15 UTCJun 26, 08:34 UTC20m
2026-06-26 KAL1569 - Jun 26, 02:20 UTCJun 26, 02:34 UTC15m
2026-06-26 KAL1570 - Jun 26, 00:39 UTCJun 26, 00:59 UTC20m
2026-06-25 KAL1023 - Jun 25, 22:34 UTCJun 25, 22:59 UTC25m
2026-06-25 KAL1330 CJU → GMP Jun 25, 12:15 UTCJun 25, 12:50 UTC35m
2026-06-25 KAL1575 - Jun 25, 09:50 UTCJun 25, 09:59 UTC10m
2026-06-25 KAL1576 - Jun 25, 08:14 UTCJun 25, 08:34 UTC20m
2026-06-25 KAL1613 - Jun 25, 06:14 UTCJun 25, 06:25 UTC10m
2026-06-25 KAL1614 - Jun 25, 04:35 UTCJun 25, 04:54 UTC20m
2026-06-25 KAL1517 - Jun 25, 01:40 UTCJun 25, 01:50 UTC10m
2026-06-25 KAL1512 - Jun 25, 00:19 UTCJun 25, 00:35 UTC15m
2026-06-24 KAL1505 - Jun 24, 22:14 UTCJun 24, 22:25 UTC10m
2026-06-23 KAL2071 PUS → PUS Jun 23, 23:50 UTCJun 24, 04:39 UTC4h 50m
2026-06-23 KAL2072 - Jun 23, 04:09 UTCJun 23, 04:35 UTC25m
2026-06-22 KAL2071 - Jun 22, 23:55 UTCJun 23, 00:09 UTC15m
2026-06-22 KAL2062 PEK → PUS Jun 22, 19:29 UTCJun 22, 21:19 UTC1h 50m
2026-06-22 KAL2061 PUS → PEK Jun 22, 13:35 UTCJun 22, 14:24 UTC50m
2026-06-22 KAL2072 - Jun 22, 04:09 UTCJun 22, 04:34 UTC25m
2026-06-22 KAL2071 - Jun 22, 00:04 UTCJun 22, 00:29 UTC25m
2026-06-21 KAL1558 - Jun 21, 12:04 UTCJun 21, 12:19 UTC15m
2026-06-21 KAL1575 - Jun 21, 09:59 UTCJun 21, 10:09 UTC10m
2026-06-21 KAL1576 - Jun 21, 08:10 UTCJun 21, 08:25 UTC15m
2026-06-21 KAL1613 - Jun 21, 05:44 UTCJun 21, 05:54 UTC10m
2026-06-21 KAL1081 - Jun 21, 02:24 UTCJun 21, 03:00 UTC35m
2026-06-21 KAL1150 - Jun 21, 00:25 UTCJun 21, 00:59 UTC35m
2026-06-20 KAL1017 - Jun 20, 22:20 UTCJun 20, 22:50 UTC30m
2026-06-20 KAL1326 CJU → GMP Jun 20, 11:54 UTCJun 20, 12:30 UTC35m
2026-06-20 KAL1165 - Jun 20, 08:34 UTCJun 20, 09:09 UTC35m
2026-06-20 KAL1238 - Jun 20, 06:49 UTCJun 20, 07:29 UTC40m
2026-06-20 KAL1107 - Jun 20, 04:34 UTCJun 20, 05:09 UTC35m
2026-06-20 KAL1178 - Jun 20, 02:35 UTCJun 20, 03:14 UTC40m
2026-06-20 KAL1049 - Jun 20, 00:14 UTCJun 20, 00:44 UTC30m

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 HL7728 page for operator, model, and routing details .

Mode-S 71BF28 frequently asked

What is Mode-S code 71BF28?
71BF28 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7728.
Where is Mode-S 71BF28 registered?
Mode-S code 71BF28 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 71BF28 broadcasting right now?
No active broadcast right now. Last signal was 14d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BF28, octal 34337450, decimal 7,454,504.
What flights does 71BF28 operate?
Mode-S 71BF28 has broadcast 20 distinct callsigns, including KAL1049, KAL1178, KAL1114, KAL1107, KAL1330.