Apparatus

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sensors Mode-S transponder

71C070

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

Currently assigned to HL8070 · BOEING 737-800

Hex
71C070
Octal
34340160
Decimal
7,454,832
Country
KR
Tail
HL8070
Type
B738
No current signal · last broadcast Jul 22, 20:55 UTC
Flights observed
430
Distinct callsigns
20
Country
KR
Last broadcast
Jul 22, 20:55 UTC

Last known position

Most recent position reported by Mode-S 71C070.

Country allocation

The ICAO 24-bit address 71C070 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
TWB675 Tway Airlines 9 2026-04-25
TWB688 - 8 2026-07-07
TWB687 - 8 2026-07-07
TWB252 - 8 2026-07-17
TWB664 - 7 2026-07-09
TWB663 - 7 2026-07-09
TWB256 Tway Airlines 7 2026-04-25
TWB255 Tway Airlines 7 2026-04-24
TWB251 Tway Airlines 7 2026-07-17
TWB850 - 6 2026-07-12
TWB849 - 6 2026-07-12
TWB735 - 6 2026-07-13
TWB728 - 6 2026-07-13
TWB639 - 6 2026-07-04
TWB322 - 6 2026-07-05
TWB807 - 5 2026-07-12
TWB727 - 5 2026-07-08
TWB720 - 5 2026-07-18
TWB715 - 5 2026-07-14
TWB710 - 5 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 TWB101F - Jul 22, 20:25 UTCJul 22, 20:55 UTC30m
2026-07-19 TWB306 KIX → ICN Jul 19, 10:50 UTCJul 19, 12:05 UTC1h 15m
2026-07-19 TWB313 TAE → KIX Jul 19, 08:10 UTCJul 19, 09:05 UTC55m
2026-07-19 TWB214 FUK → TAE Jul 19, 06:00 UTCJul 19, 06:35 UTC35m
2026-07-19 TWB227 CJU → FUK Jul 19, 04:05 UTCJul 19, 04:25 UTC20m
2026-07-19 TWB707 - Jul 19, 00:55 UTCJul 19, 01:30 UTC35m
2026-07-18 TWB702 CJU → GMP Jul 18, 23:10 UTCJul 18, 23:50 UTC40m
2026-07-18 TWB801 TAE → CJU Jul 18, 21:20 UTCJul 18, 21:35 UTC15m
2026-07-18 TWB812 - Jul 18, 12:50 UTCJul 18, 13:20 UTC30m
2026-07-18 TWB811 - Jul 18, 10:50 UTCJul 18, 11:05 UTC15m
2026-07-18 TWB806 CJU → TAE Jul 18, 09:20 UTCJul 18, 09:45 UTC25m
2026-07-18 TWB725 - Jul 18, 06:55 UTCJul 18, 07:30 UTC35m
2026-07-18 TWB720 - Jul 18, 05:05 UTCJul 18, 05:50 UTC45m
2026-07-18 TWB228 FUK → CJU Jul 18, 01:39 UTCJul 18, 02:05 UTC25m
2026-07-17 TWB213 TAE → FUK Jul 17, 23:30 UTCJul 17, 23:50 UTC20m
2026-07-17 TWB038 - Jul 17, 20:55 UTCJul 17, 21:25 UTC30m
2026-07-17 TWB037 - Jul 17, 11:35 UTCJul 17, 19:45 UTC8h 10m
2026-07-17 TWB252 - Jul 17, 05:15 UTCJul 17, 06:15 UTC1h 0m
2026-07-17 TWB251 TAE → NRT Jul 17, 01:49 UTCJul 17, 03:30 UTC1h 40m
2026-07-16 TWB013 - Jul 16, 13:45 UTCJul 17, 00:04 UTC10h 20m
2026-07-16 TWB246 NRT → ICN Jul 16, 10:20 UTCJul 16, 12:14 UTC1h 55m
2026-07-16 TWB245 ICN → NRT Jul 16, 06:25 UTCJul 16, 08:20 UTC1h 55m
2026-07-16 TWB202 - Jul 16, 03:40 UTCJul 16, 04:40 UTC1h 0m
2026-07-16 TWB201 - Jul 16, 01:20 UTCJul 16, 02:05 UTC45m
2026-07-15 TWB306 KIX → ICN Jul 15, 10:55 UTCJul 15, 12:15 UTC1h 20m
2026-07-15 TWB313 - Jul 15, 08:00 UTCJul 15, 09:10 UTC1h 10m
2026-07-15 TWB312 - Jul 15, 01:55 UTCJul 15, 02:25 UTC30m
2026-07-14 TWB311 - Jul 14, 23:15 UTCJul 15, 00:15 UTC1h 0m
2026-07-14 TWB808 - Jul 14, 09:50 UTCJul 14, 10:15 UTC25m
2026-07-14 TWB907 - Jul 14, 07:45 UTCJul 14, 08:00 UTC15m
2026-07-14 TWB906 - Jul 14, 06:35 UTCJul 14, 07:00 UTC25m
2026-07-14 TWB715 - Jul 14, 04:10 UTCJul 14, 04:45 UTC35m
2026-07-14 TWB708 - Jul 14, 01:35 UTCJul 14, 02:15 UTC40m
2026-07-13 TWB705 - Jul 13, 23:05 UTCJul 13, 23:40 UTC35m
2026-07-13 TWB736 - Jul 13, 12:40 UTCJul 13, 13:20 UTC40m
2026-07-13 TWB735 - Jul 13, 10:35 UTCJul 13, 11:10 UTC35m
2026-07-13 TWB728 - Jul 13, 08:50 UTCJul 13, 09:30 UTC40m
2026-07-13 TW761 - Jul 13, 06:15 UTCJul 13, 07:01 UTC45m
2026-07-13 TWB710 - Jul 13, 02:45 UTCJul 13, 03:25 UTC40m
2026-07-12 TWB841 - Jul 12, 23:05 UTCJul 12, 23:40 UTC35m
2026-07-12 TWB850 - Jul 12, 13:20 UTCJul 12, 13:50 UTC30m
2026-07-12 TWB849 - Jul 12, 11:20 UTCJul 12, 11:45 UTC25m
2026-07-12 TWB844 - Jul 12, 09:40 UTCJul 12, 10:10 UTC30m
2026-07-12 TWB725 - Jul 12, 07:15 UTCJul 12, 07:50 UTC35m
2026-07-12 TWB720 - Jul 12, 05:20 UTCJul 12, 06:05 UTC45m
2026-07-12 TWB807 - Jul 12, 02:50 UTCJul 12, 03:05 UTC15m
2026-07-11 TWB216 - Jul 11, 10:30 UTCJul 11, 10:55 UTC25m
2026-07-11 TWB215 - Jul 11, 08:25 UTCJul 11, 08:55 UTC30m
2026-07-11 TWB312 - Jul 11, 02:05 UTCJul 11, 02:40 UTC35m
2026-07-10 TWB311 - Jul 10, 23:25 UTCJul 11, 00:05 UTC40m

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 HL8070 page for operator, model, and routing details .

Mode-S 71C070 frequently asked

What is Mode-S code 71C070?
71C070 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8070.
Where is Mode-S 71C070 registered?
Mode-S code 71C070 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 71C070 broadcasting right now?
No active broadcast right now. Last signal was Jul 22, 20:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C070, octal 34340160, decimal 7,454,832.
What flights does 71C070 operate?
Mode-S 71C070 has broadcast 20 distinct callsigns, including TWB675, TWB688, TWB687, TWB252, TWB664.