Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71E258

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

Hex
71E258
Octal
34361130
Decimal
7,463,512
Country
KR
No current signal · last broadcast 1d ago
Flights observed
99
Distinct callsigns
1
Country
KR
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 71E258.

Country allocation

The ICAO 24-bit address 71E258 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 1 distinct

Callsign Airline Flights Last seen
HLC258 - 97 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 HLC258 - Jul 26, 07:30 UTCJul 26, 09:15 UTC1h 45m
2026-07-26 HLC258 - Jul 26, 06:35 UTCJul 26, 06:50 UTC15m
2026-07-26 HLC258 - Jul 26, 04:05 UTCJul 26, 05:45 UTC1h 40m
2026-07-26 HLC258 - Jul 26, 02:45 UTCJul 26, 03:20 UTC35m
2026-07-26 HLC258 - Jul 26, 01:25 UTCJul 26, 01:35 UTC10m
2026-07-25 HLC258 - Jul 25, 07:15 UTCJul 25, 09:55 UTC2h 40m
2026-07-25 HLC258 - Jul 25, 06:05 UTCJul 25, 06:20 UTC15m
2026-07-25 HLC258 - Jul 25, 05:05 UTCJul 25, 05:30 UTC25m
2026-07-25 HLC258 - Jul 25, 00:50 UTCJul 25, 02:55 UTC2h 5m
2026-07-24 HLC258 - Jul 24, 07:10 UTCJul 24, 08:05 UTC55m
2026-07-24 HLC258 - Jul 24, 05:30 UTCJul 24, 06:15 UTC45m
2026-07-24 HLC258 - Jul 24, 01:45 UTCJul 24, 03:25 UTC1h 40m
2026-07-23 HLC258 - Jul 23, 21:45 UTCJul 23, 23:45 UTC2h 0m
2026-07-19 HLC258 - Jul 19, 07:40 UTCJul 19, 09:50 UTC2h 10m
2026-07-19 HLC258 - Jul 19, 03:55 UTCJul 19, 07:05 UTC3h 10m
2026-07-19 HLC258 - Jul 19, 02:50 UTCJul 19, 03:05 UTC15m
2026-07-19 HLC258 - Jul 19, 02:00 UTCJul 19, 02:15 UTC15m
2026-07-18 HLC258 - Jul 18, 22:45 UTCJul 18, 23:30 UTC45m
2026-07-17 HLC258 - Jul 17, 09:10 UTCJul 17, 09:55 UTC45m
2026-07-17 HLC258 - Jul 17, 07:35 UTCJul 17, 08:30 UTC55m
2026-07-17 HLC258 - Jul 17, 05:25 UTCJul 17, 07:00 UTC1h 35m
2026-07-17 HLC258 - Jul 17, 03:59 UTCJul 17, 04:54 UTC55m
2026-07-17 HLC258 - Jul 17, 00:35 UTCJul 17, 00:45 UTC10m
2026-07-16 HLC258 - Jul 16, 07:35 UTCJul 16, 07:50 UTC15m
2026-07-16 HLC258 - Jul 16, 06:15 UTCJul 16, 07:05 UTC50m
2026-07-16 HLC258 - Jul 16, 02:15 UTCJul 16, 02:55 UTC40m
2026-07-15 HLC258 - Jul 15, 22:15 UTCJul 15, 23:25 UTC1h 10m
2026-07-13 HLC258 - Jul 13, 06:15 UTCJul 13, 06:35 UTC20m
2026-07-13 HLC258 - Jul 13, 03:50 UTCJul 13, 04:25 UTC35m
2026-07-13 HLC258 - Jul 13, 00:35 UTCJul 13, 00:45 UTC10m
2026-07-12 HLC258 - Jul 12, 07:01 UTCJul 12, 08:01 UTC1h 0m
2026-07-12 HLC258 - Jul 12, 05:40 UTCJul 12, 05:50 UTC10m
2026-07-12 HLC258 - Jul 12, 03:30 UTCJul 12, 05:05 UTC1h 35m
2026-07-11 HLC258 - Jul 11, 09:00 UTCJul 11, 09:35 UTC35m
2026-07-11 HLC258 - Jul 11, 05:05 UTCJul 11, 06:10 UTC1h 5m
2026-07-11 HLC258 - Jul 11, 04:01 UTCJul 11, 04:15 UTC15m
2026-07-11 HLC258 - Jul 11, 01:55 UTCJul 11, 03:10 UTC1h 15m
2026-07-04 HLC258 - Jul 4, 09:35 UTCJul 4, 09:50 UTC15m
2026-07-04 HLC258 - Jul 4, 07:45 UTCJul 4, 08:55 UTC1h 10m
2026-07-04 HLC258 - Jul 4, 05:20 UTCJul 4, 05:30 UTC10m
2026-07-04 HLC258 - Jul 4, 00:35 UTCJul 4, 00:45 UTC10m
2026-07-03 HLC258 - Jul 3, 23:05 UTCJul 4, 00:00 UTC55m
2026-07-03 HLC258 - Jul 3, 02:10 UTCJul 3, 02:25 UTC15m
2026-07-03 HLC258 - Jul 3, 00:30 UTCJul 3, 00:45 UTC15m
2026-07-02 HLC258 - Jul 2, 22:10 UTCJul 2, 23:25 UTC1h 15m
2026-07-02 - - Jul 2, 05:10 UTCJul 2, 05:35 UTC25m
2026-07-01 HLC258 - Jul 1, 04:40 UTCJul 1, 05:30 UTC50m
2026-07-01 HLC258 - Jul 1, 01:55 UTCJul 1, 03:35 UTC1h 40m
2026-07-01 HLC258 - Jul 1, 00:10 UTCJul 1, 01:05 UTC55m
2026-06-29 HLC258 - Jun 29, 09:10 UTCJun 29, 09:25 UTC15m

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.

Mode-S 71E258 frequently asked

What is Mode-S code 71E258?
71E258 is an ICAO 24-bit transponder address. Allocated to Korea, South.
Where is Mode-S 71E258 registered?
Mode-S code 71E258 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 71E258 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71E258, octal 34361130, decimal 7,463,512.
What flights does 71E258 operate?
Mode-S 71E258 has broadcast 1 distinct callsign, including HLC258.