Apparatus

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sensors Mode-S transponder

71C273

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

Currently assigned to HL8273 · BOEING 737-900

Hex
71C273
Octal
34341163
Decimal
7,455,347
Country
KR
Tail
HL8273
Type
B739
No current signal · last broadcast Jul 26, 19:50 UTC
Flights observed
316
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 19:50 UTC

Last known position

Most recent position reported by Mode-S 71C273.

Country allocation

The ICAO 24-bit address 71C273 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
KAL2134 Korean Air 21 2026-07-21
KAL1405 Korean Air 20 2026-07-19
KAL2133 Korean Air 19 2026-07-21
KAL1402 - 19 2026-07-21
KAL2081 Korean Air 17 2026-07-21
KAL133 Korean Air 17 2026-07-25
KAL134 Korean Air 15 2026-07-26
KAL115 - 14 2026-07-19
KAL116 - 12 2026-07-19
KAL146 Korean Air 7 2026-07-26
KAL126 - 7 2026-06-21
KAL1214 - 7 2026-07-09
KAL145 Korean Air 6 2026-07-26
KAL1432 Korean Air 6 2026-07-24
KAL1431 Korean Air 6 2026-07-24
KAL1136 - 6 2026-07-09
KAL1007 - 6 2026-07-08
KAL1562 - 5 2026-07-19
KAL1549 - 5 2026-07-19
KAL1272 - 5 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KAL146 CSX → ICN Jul 26, 19:20 UTCJul 26, 19:50 UTC30m
2026-07-26 KAL145 ICN → CSX Jul 26, 13:00 UTCJul 26, 13:20 UTC20m
2026-07-26 KAL134 CGO → ICN Jul 26, 05:00 UTCJul 26, 05:20 UTC20m
2026-07-25 KAL133 ICN → CGO Jul 25, 23:35 UTCJul 26, 00:00 UTC25m
2026-07-25 KAL9760 KUH → ICN Jul 25, 07:00 UTCJul 25, 09:25 UTC2h 25m
2026-07-25 KAL9759 ICN → KUH Jul 25, 02:40 UTCJul 25, 05:00 UTC2h 20m
2026-07-24 KAL1432 TAE → ICN Jul 24, 23:00 UTCJul 24, 23:40 UTC40m
2026-07-24 KAL1431 ICN → TAE Jul 24, 10:20 UTCJul 24, 10:40 UTC20m
2026-07-24 KAL134 CGO → ICN Jul 24, 04:40 UTCJul 24, 05:10 UTC30m
2026-07-23 KAL133 ICN → CGO Jul 23, 23:30 UTCJul 23, 23:55 UTC25m
2026-07-23 KAL782 FUK → ICN Jul 23, 12:30 UTCJul 23, 13:30 UTC1h 0m
2026-07-23 KAL781 ICN → FUK Jul 23, 10:00 UTCJul 23, 10:45 UTC45m
2026-07-23 KAL134 CGO → ICN Jul 23, 06:00 UTCJul 23, 06:40 UTC40m
2026-07-22 KAL133 ICN → CGO Jul 22, 23:30 UTCJul 22, 23:55 UTC25m
2026-07-22 KAL146 CSX → ICN Jul 22, 19:25 UTCJul 22, 19:45 UTC20m
2026-07-22 KAL145 ICN → CSX Jul 22, 13:10 UTCJul 22, 13:40 UTC30m
2026-07-22 KAL9759 ICN → KUH Jul 22, 02:50 UTCJul 22, 05:05 UTC2h 15m
2026-07-21 KAL1402 - Jul 21, 22:15 UTCJul 21, 23:00 UTC45m
2026-07-21 KAL2134 NGO → PUS Jul 21, 11:10 UTCJul 21, 12:30 UTC1h 20m
2026-07-21 KAL2133 PUS → NGO Jul 21, 08:35 UTCJul 21, 09:35 UTC1h 0m
2026-07-21 KAL2081 PUS → TAO Jul 21, 02:25 UTCJul 21, 07:05 UTC4h 40m
2026-07-20 KAL2134 - Jul 20, 11:15 UTCJul 20, 12:15 UTC1h 0m
2026-07-20 KAL2133 PUS → NGO Jul 20, 08:35 UTCJul 20, 09:40 UTC1h 5m
2026-07-20 KAL2081 PUS → TAO Jul 20, 02:15 UTCJul 20, 06:55 UTC4h 40m
2026-07-19 KAL1562 - Jul 19, 12:35 UTCJul 19, 12:55 UTC20m
2026-07-19 KAL1549 - Jul 19, 10:35 UTCJul 19, 10:50 UTC15m
2026-07-19 KAL1405 ICN → PUS Jul 19, 08:25 UTCJul 19, 09:10 UTC45m
2026-07-19 KAL116 - Jul 19, 05:40 UTCJul 19, 06:00 UTC20m
2026-07-19 KAL115 - Jul 19, 00:50 UTCJul 19, 01:30 UTC40m
2026-07-18 KAL1402 - Jul 18, 22:15 UTCJul 18, 23:00 UTC45m
2026-07-18 KAL1562 - Jul 18, 12:35 UTCJul 18, 12:50 UTC15m
2026-07-18 KAL1549 - Jul 18, 10:45 UTCJul 18, 11:00 UTC15m
2026-07-18 KAL1405 ICN → PUS Jul 18, 08:50 UTCJul 18, 09:30 UTC40m
2026-07-18 KAL128 - Jul 18, 05:10 UTCJul 18, 05:50 UTC40m
2026-07-17 KAL127 - Jul 17, 23:45 UTCJul 18, 00:10 UTC25m
2026-07-15 KAL1432 - Jul 15, 23:05 UTCJul 15, 23:35 UTC30m
2026-07-15 KAL1431 - Jul 15, 10:20 UTCJul 15, 10:45 UTC25m
2026-07-15 KAL107 - Jul 15, 03:30 UTCJul 15, 08:45 UTC5h 15m
2026-07-14 KAL620 - Jul 14, 19:35 UTCJul 14, 23:10 UTC3h 34m
2026-07-14 KAL619 ICN → MNL Jul 14, 14:00 UTCJul 14, 17:25 UTC3h 25m
2026-07-14 KAL116 - Jul 14, 08:25 UTCJul 14, 08:50 UTC25m
2026-07-14 KAL115 - Jul 14, 02:35 UTCJul 14, 02:55 UTC20m
2026-07-13 KAL1402 PUS → ICN Jul 13, 22:00 UTCJul 13, 22:50 UTC50m
2026-07-13 KAL1562 - Jul 13, 12:50 UTCJul 13, 13:05 UTC15m
2026-07-13 KAL1549 - Jul 13, 10:30 UTCJul 13, 10:40 UTC10m
2026-07-13 KAL1405 - Jul 13, 08:30 UTCJul 13, 09:10 UTC40m
2026-07-13 KAL116 - Jul 13, 05:40 UTCJul 13, 06:01 UTC20m
2026-07-13 KAL115 - Jul 13, 00:50 UTCJul 13, 01:15 UTC25m
2026-07-12 KAL1402 - Jul 12, 22:10 UTCJul 12, 23:00 UTC50m
2026-07-12 KAL2134 - Jul 12, 11:05 UTCJul 12, 12:05 UTC1h 0m

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 HL8273 page for operator, model, and routing details .

Mode-S 71C273 frequently asked

What is Mode-S code 71C273?
71C273 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8273.
Where is Mode-S 71C273 registered?
Mode-S code 71C273 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 71C273 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C273, octal 34341163, decimal 7,455,347.
What flights does 71C273 operate?
Mode-S 71C273 has broadcast 20 distinct callsigns, including KAL2134, KAL1405, KAL2133, KAL1402, KAL2081.