Apparatus

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sensors Mode-S transponder

71BF00

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

Currently assigned to HL7700 · BOEING 777-200

Hex
71BF00
Octal
34337400
Decimal
7,454,464
Country
KR
Tail
HL7700
Type
B772
No current signal · last broadcast 41m ago
Flights observed
224
Distinct callsigns
20
Country
KR
Last broadcast
41m ago

Last known position

Most recent position reported by Mode-S 71BF00.

Country allocation

The ICAO 24-bit address 71BF00 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
AAR551 - 32 2026-07-14
AAR552 - 27 2026-07-12
AAR602 - 18 2026-07-06
AAR271 - 18 2026-07-08
AAR601 - 16 2026-07-05
AAR272 - 13 2026-07-07
AAR730 - 9 2026-07-07
AAR561 - 9 2026-06-19
AAR562 Asiana Airlines 8 2026-06-20
AAR703 - 7 2026-07-13
AAR232 Asiana Airlines 7 2026-06-05
AAR729 - 6 2026-07-07
AAR704 - 6 2026-07-13
AAR734 - 4 2026-07-12
AAR372 Asiana Airlines 4 2026-05-31
AAR334 Asiana Airlines 4 2026-04-30
AAR231 Asiana Airlines 4 2026-06-05
AAR733 - 3 2026-07-12
AAR713 - 3 2026-06-21
AAR371 Asiana Airlines 3 2026-05-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 AAR551 - Jul 14, 01:55 UTCJul 14, 02:00 UTC5m
2026-07-13 AAR704 - Jul 13, 16:25 UTCJul 13, 19:45 UTC3h 20m
2026-07-13 AAR703 - Jul 13, 11:05 UTCJul 13, 14:40 UTC3h 35m
2026-07-12 AAR734 - Jul 12, 20:01 UTCJul 12, 20:40 UTC40m
2026-07-12 AAR734 - Jul 12, 16:50 UTCJul 12, 17:01 UTC10m
2026-07-12 AAR733 - Jul 12, 11:01 UTCJul 12, 11:10 UTC10m
2026-07-12 AAR360 ICN → ICN Jul 12, 04:01 UTCJul 12, 09:05 UTC5h 5m
2026-07-12 AAR552 - Jul 12, 00:10 UTCJul 12, 00:30 UTC20m
2026-07-11 AAR552 - Jul 11, 15:20 UTCJul 11, 23:15 UTC7h 55m
2026-07-11 AAR551 - Jul 11, 02:10 UTCJul 11, 13:05 UTC10h 55m
2026-07-10 AAR704 - Jul 10, 16:15 UTCJul 10, 19:45 UTC3h 30m
2026-07-10 AAR703 ICN → MNL Jul 10, 10:45 UTCJul 10, 14:15 UTC3h 30m
2026-07-10 AAR370 - Jul 10, 07:15 UTCJul 10, 08:00 UTC45m
2026-07-10 AAR369 - Jul 10, 00:20 UTCJul 10, 01:00 UTC40m
2026-07-08 AAR271 SEA → ICN Jul 8, 07:30 UTCJul 8, 19:10 UTC11h 40m
2026-07-07 AAR272 - Jul 7, 13:30 UTCJul 7, 23:05 UTC9h 35m
2026-07-07 AAR730 - Jul 7, 09:40 UTCJul 7, 10:20 UTC40m
2026-07-07 AAR730 - Jul 7, 06:40 UTCJul 7, 07:00 UTC20m
2026-07-07 AAR729 - Jul 7, 01:00 UTCJul 7, 04:40 UTC3h 40m
2026-07-06 AAR602 SYD → ICN Jul 6, 11:30 UTCJul 6, 21:45 UTC10h 15m
2026-07-05 AAR601 - Jul 5, 23:20 UTCJul 6, 09:10 UTC9h 50m
2026-07-05 AAR704 - Jul 5, 16:05 UTCJul 5, 19:20 UTC3h 15m
2026-07-05 AAR703 - Jul 5, 10:45 UTCJul 5, 14:20 UTC3h 35m
2026-07-05 AAR173 - Jul 5, 05:55 UTCJul 5, 08:35 UTC2h 40m
2026-07-05 AAR174 - Jul 5, 01:45 UTCJul 5, 03:55 UTC2h 10m
2026-07-04 AAR734 - Jul 4, 16:40 UTCJul 4, 20:30 UTC3h 50m
2026-07-04 AAR733 - Jul 4, 10:55 UTCJul 4, 14:45 UTC3h 50m
2026-07-03 AAR602 SYD → ICN Jul 3, 11:20 UTCJul 3, 21:35 UTC10h 15m
2026-07-02 AAR601 ICN → SYD Jul 2, 23:20 UTCJul 3, 09:10 UTC9h 50m
2026-07-02 AAR552 - Jul 2, 05:25 UTCJul 2, 05:45 UTC20m
2026-07-01 AAR552 - Jul 1, 20:35 UTCJul 1, 22:20 UTC1h 45m
2026-07-01 AAR551 - Jul 1, 13:00 UTCJul 1, 13:20 UTC20m
2026-07-01 AAR551 - Jul 1, 03:35 UTCJul 1, 12:25 UTC8h 50m
2026-07-01 AAR551 - Jul 1, 02:20 UTCJul 1, 02:40 UTC20m
2026-06-30 AAR271 SEA → ICN Jun 30, 07:25 UTCJun 30, 18:30 UTC11h 5m
2026-06-29 AAR272 ICN → SEA Jun 29, 12:45 UTCJun 29, 22:05 UTC9h 20m
2026-06-29 AAR730 - Jun 29, 06:50 UTCJun 29, 10:29 UTC3h 40m
2026-06-29 AAR729 - Jun 29, 00:39 UTCJun 29, 04:34 UTC3h 55m
2026-06-28 AAR602 SYD → ICN Jun 28, 11:45 UTCJun 28, 21:45 UTC10h 0m
2026-06-27 AAR601 - Jun 27, 23:25 UTCJun 28, 09:20 UTC9h 55m
2026-06-27 AAR730 - Jun 27, 06:54 UTCJun 27, 10:50 UTC3h 55m
2026-06-27 AAR729 - Jun 27, 00:50 UTCJun 27, 05:04 UTC4h 15m
2026-06-26 AAR602 SYD → ICN Jun 26, 11:20 UTCJun 26, 21:55 UTC10h 35m
2026-06-25 AAR601 ICN → SYD Jun 25, 23:30 UTCJun 26, 09:30 UTC10h 0m
2026-06-25 AAR730 - Jun 25, 06:40 UTCJun 25, 10:25 UTC3h 45m
2026-06-25 AAR729 - Jun 25, 00:55 UTCJun 25, 04:54 UTC4h 0m
2026-06-24 AAR602 SYD → ICN Jun 24, 11:14 UTCJun 24, 21:50 UTC10h 35m
2026-06-23 AAR601 ICN → SYD Jun 23, 23:14 UTCJun 24, 09:00 UTC9h 45m
2026-06-23 AAR271 - Jun 23, 07:29 UTCJun 23, 17:59 UTC10h 30m
2026-06-22 AAR272 ICN → SEA Jun 22, 12:49 UTCJun 22, 22:10 UTC9h 20m

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 HL7700 page for operator, model, and routing details .

Mode-S 71BF00 frequently asked

What is Mode-S code 71BF00?
71BF00 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7700.
Where is Mode-S 71BF00 registered?
Mode-S code 71BF00 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 71BF00 broadcasting right now?
No active broadcast right now. Last signal was 41m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BF00, octal 34337400, decimal 7,454,464.
What flights does 71BF00 operate?
Mode-S 71BF00 has broadcast 20 distinct callsigns, including AAR551, AAR552, AAR602, AAR271, AAR601.