Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71D870

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

Currently assigned to 970 · KOREA AEROSPACE Surion

Hex
71D870
Octal
34354160
Decimal
7,460,976
Country
KR
Tail
970
Type
SURN
No current signal · last broadcast 1d ago
Flights observed
22
Distinct callsigns
1
Country
KR
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 71D870.

Country allocation

The ICAO 24-bit address 71D870 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
KNP970 - 22 2026-06-21

Recent flights last 22

DateFlightRouteTakeoffLandingDuration
2026-06-21 KNP970 - Jun 21, 07:59 UTCJun 21, 08:49 UTC50m
2026-06-18 KNP970 - Jun 18, 07:15 UTCJun 18, 08:00 UTC45m
2026-06-17 KNP970 - Jun 17, 23:25 UTCJun 17, 23:55 UTC30m
2026-06-17 KNP970 - Jun 17, 05:35 UTCJun 17, 06:05 UTC30m
2026-06-17 KNP970 - Jun 17, 01:00 UTCJun 17, 01:30 UTC30m
2026-06-16 KNP970 - Jun 16, 10:45 UTCJun 16, 11:49 UTC1h 5m
2026-06-16 KNP970 - Jun 16, 09:45 UTCJun 16, 10:15 UTC30m
2026-06-10 KNP970 GMP → GMP Jun 10, 09:10 UTCJun 10, 10:40 UTC1h 30m
2026-06-09 KNP970 - Jun 9, 01:05 UTCJun 9, 02:25 UTC1h 20m
2026-06-06 KNP970 GMP → GMP Jun 6, 10:39 UTCJun 6, 12:14 UTC1h 35m
2026-06-02 KNP970 GMP → GMP Jun 2, 10:35 UTCJun 2, 11:25 UTC50m
2026-05-22 KNP970 GMP → GMP May 22, 10:00 UTCMay 22, 11:35 UTC1h 35m
2026-05-22 KNP970 - May 22, 05:15 UTCMay 22, 06:35 UTC1h 20m
2026-05-16 KNP970 - May 16, 07:16 UTCMay 16, 07:31 UTC15m
2026-05-16 KNP970 GMP → SWU May 16, 05:30 UTCMay 16, 06:41 UTC1h 11m
2026-05-16 KNP970 - May 16, 03:40 UTCMay 16, 03:55 UTC15m
2026-05-16 KNP970 - May 16, 03:00 UTCMay 16, 03:35 UTC35m
2026-05-08 KNP970 - May 8, 04:00 UTCMay 8, 04:54 UTC55m
2026-05-08 KNP970 - May 8, 00:20 UTCMay 8, 01:09 UTC50m
2026-05-02 KNP970 - May 2, 05:40 UTCMay 2, 06:35 UTC55m
2026-04-30 KNP970 - Apr 30, 01:40 UTCApr 30, 02:00 UTC20m
2026-04-30 KNP970 - Apr 30, 00:50 UTCApr 30, 01:05 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.

Prefer a tail-number view? See the 970 page for operator, model, and routing details .

Mode-S 71D870 frequently asked

What is Mode-S code 71D870?
71D870 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to 970.
Where is Mode-S 71D870 registered?
Mode-S code 71D870 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 71D870 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 71D870, octal 34354160, decimal 7,460,976.
What flights does 71D870 operate?
Mode-S 71D870 has broadcast 1 distinct callsign, including KNP970.