Apparatus

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sensors Mode-S transponder

71BF91

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

Currently assigned to HL7791 · BOEING 777-200

Hex
71BF91
Octal
34337621
Decimal
7,454,609
Country
KR
Tail
HL7791
Type
B772
Broadcasting now · callsign AAR271 · 30,000 ft
Flights observed
203
Distinct callsigns
20
Country
KR
Last broadcast
9h ago

Current position

71BF91 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71BF91 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
AAR704 - 18 2026-07-07
AAR703 - 17 2026-07-07
AAR602 - 14 2026-07-09
AAR729 - 13 2026-06-24
AAR730 - 12 2026-06-24
AAR601 - 12 2026-07-08
AAR551 - 9 2026-06-30
AAR232 Asiana Airlines 8 2026-06-15
AAR231 - 7 2026-06-16
AAR552 - 6 2026-07-01
AAR370 - 6 2026-07-08
AAR272 - 6 2026-07-13
AAR360 Asiana Airlines 5 2026-06-15
AAR271 - 5 2026-06-26
AAR713 Asiana Airlines 4 2026-04-29
AAR562 Asiana Airlines 4 2026-06-06
AAR371 Asiana Airlines 4 2026-05-18
AAR369 - 4 2026-07-07
AAR714 Asiana Airlines 3 2026-04-29
AAR561 Asiana Airlines 3 2026-06-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 AAR272 ICN → SEA Jul 13, 12:45 UTCJul 13, 22:40 UTC9h 55m
2026-07-13 AAR101 - Jul 13, 04:10 UTCJul 13, 06:10 UTC2h 0m
2026-07-12 AAR102 ICN → NRT Jul 12, 23:45 UTCJul 13, 01:50 UTC2h 5m
2026-07-09 AAR602 SYD → ICN Jul 9, 11:30 UTCJul 9, 22:00 UTC10h 30m
2026-07-08 AAR601 - Jul 8, 23:35 UTCJul 9, 09:20 UTC9h 45m
2026-07-08 AAR370 ICN → ICN Jul 8, 00:00 UTCJul 8, 10:05 UTC10h 5m
2026-07-07 AAR704 - Jul 7, 16:35 UTCJul 7, 20:00 UTC3h 25m
2026-07-07 AAR703 ICN → MNL Jul 7, 11:05 UTCJul 7, 14:35 UTC3h 30m
2026-07-07 AAR370 - Jul 7, 07:15 UTCJul 7, 08:00 UTC45m
2026-07-07 AAR369 - Jul 7, 00:15 UTCJul 7, 00:55 UTC40m
2026-07-06 AAR704 - Jul 6, 16:05 UTCJul 6, 19:30 UTC3h 25m
2026-07-06 AAR703 - Jul 6, 10:45 UTCJul 6, 14:15 UTC3h 30m
2026-07-06 AAR362 - Jul 6, 01:15 UTCJul 6, 06:10 UTC4h 55m
2026-07-05 AAR734 - Jul 5, 19:50 UTCJul 5, 20:35 UTC45m
2026-07-05 AAR734 - Jul 5, 16:50 UTCJul 5, 17:00 UTC10m
2026-07-05 AAR733 - Jul 5, 10:55 UTCJul 5, 14:40 UTC3h 45m
2026-07-05 AAR101 - Jul 5, 04:35 UTCJul 5, 06:35 UTC2h 0m
2026-07-04 AAR102 ICN → NRT Jul 4, 23:45 UTCJul 5, 01:30 UTC1h 45m
2026-07-04 AAR602 SYD → ICN Jul 4, 11:20 UTCJul 4, 21:45 UTC10h 25m
2026-07-03 AAR601 - Jul 3, 23:20 UTCJul 4, 08:50 UTC9h 30m
2026-07-03 AAR704 - Jul 3, 16:15 UTCJul 3, 19:40 UTC3h 25m
2026-07-03 AAR703 - Jul 3, 10:45 UTCJul 3, 14:15 UTC3h 30m
2026-07-03 AAR173 - Jul 3, 05:40 UTCJul 3, 08:10 UTC2h 30m
2026-07-03 AAR174 - Jul 3, 01:35 UTCJul 3, 03:45 UTC2h 10m
2026-07-02 AAR602 SYD → ICN Jul 2, 11:35 UTCJul 2, 21:55 UTC10h 20m
2026-07-01 AAR601 - Jul 1, 23:20 UTCJul 2, 09:05 UTC9h 45m
2026-07-01 AAR704 - Jul 1, 16:20 UTCJul 1, 19:45 UTC3h 25m
2026-07-01 AAR703 - Jul 1, 10:35 UTCJul 1, 14:10 UTC3h 35m
2026-07-01 AAR552 - Jul 1, 00:00 UTCJul 1, 00:20 UTC20m
2026-06-30 AAR552 - Jun 30, 15:05 UTCJun 30, 23:05 UTC8h 0m
2026-06-30 AAR551 - Jun 30, 12:35 UTCJun 30, 13:00 UTC25m
2026-06-30 AAR551 - Jun 30, 03:00 UTCJun 30, 12:00 UTC9h 0m
2026-06-30 AAR551 - Jun 30, 01:50 UTCJun 30, 02:05 UTC15m
2026-06-29 AAR602 SYD → ICN Jun 29, 11:25 UTCJun 29, 21:39 UTC10h 15m
2026-06-28 AAR601 - Jun 28, 23:25 UTCJun 29, 09:05 UTC9h 40m
2026-06-28 AAR704 - Jun 28, 16:05 UTCJun 28, 19:29 UTC3h 25m
2026-06-28 AAR703 - Jun 28, 10:39 UTCJun 28, 14:14 UTC3h 35m
2026-06-27 AAR602 SYD → ICN Jun 27, 11:20 UTCJun 27, 21:25 UTC10h 5m
2026-06-26 AAR601 ICN → SYD Jun 26, 23:25 UTCJun 27, 09:15 UTC9h 50m
2026-06-26 AAR271 SEA → ICN Jun 26, 07:39 UTCJun 26, 18:44 UTC11h 5m
2026-06-25 AAR272 ICN → SEA Jun 25, 13:00 UTCJun 25, 22:10 UTC9h 10m
2026-06-24 AAR730 - Jun 24, 06:50 UTCJun 24, 10:35 UTC3h 45m
2026-06-24 AAR729 - Jun 24, 03:50 UTCJun 24, 04:30 UTC40m
2026-06-24 AAR729 - Jun 24, 00:40 UTCJun 24, 01:19 UTC40m
2026-06-23 AAR602 SYD → ICN Jun 23, 11:24 UTCJun 23, 21:49 UTC10h 25m
2026-06-22 AAR601 ICN → SYD Jun 22, 23:10 UTCJun 23, 08:50 UTC9h 40m
2026-06-22 AAR271 - Jun 22, 07:30 UTCJun 22, 18:19 UTC10h 50m
2026-06-21 AAR272 ICN → SEA Jun 21, 12:44 UTCJun 21, 22:34 UTC9h 50m
2026-06-21 AAR730 - Jun 21, 07:00 UTCJun 21, 10:44 UTC3h 45m
2026-06-21 AAR729 - Jun 21, 00:49 UTCJun 21, 04:34 UTC3h 45m

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 HL7791 page for operator, model, and routing details .

Mode-S 71BF91 frequently asked

What is Mode-S code 71BF91?
71BF91 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7791.
Where is Mode-S 71BF91 registered?
Mode-S code 71BF91 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 71BF91 broadcasting right now?
Yes. Mode-S 71BF91 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BF91, octal 34337621, decimal 7,454,609.
What flights does 71BF91 operate?
Mode-S 71BF91 has broadcast 20 distinct callsigns, including AAR704, AAR703, AAR602, AAR729, AAR730.