Apparatus

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sensors Mode-S transponder

71C303

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

Currently assigned to HL8303 · BOEING 737-800

Hex
71C303
Octal
34341403
Decimal
7,455,491
Country
KR
Tail
HL8303
Type
B738
No current signal · last broadcast 4h ago
Flights observed
368
Distinct callsigns
20
Country
KR
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 71C303.

Country allocation

The ICAO 24-bit address 71C303 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
JJA1616 - 19 2026-07-11
JJA1615 - 18 2026-07-11
JJA6001 Jeju Air 12 2026-07-20
JJA1408 - 12 2026-07-11
JJA6002 - 11 2026-07-20
JJA1604 Jeju Air 11 2026-07-23
JJA1407 - 11 2026-07-11
JJA1395 Jeju Air 11 2026-07-21
JJA2202 - 10 2026-07-12
JJA1603 Jeju Air 10 2026-07-23
JJA1396 Jeju Air 10 2026-07-22
JJA1402 - 9 2026-07-10
JJA1401 - 8 2026-07-09
JJA2103 - 7 2026-07-17
JJA1702 - 7 2026-07-12
JJA1701 - 7 2026-07-11
JJA1611 - 7 2026-07-14
JJA2201 - 6 2026-07-12
JJA2104 - 6 2026-07-17
JJA1612 - 6 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 JJA1604 FSZ → ICN Jul 23, 09:10 UTCJul 23, 10:55 UTC1h 45m
2026-07-23 JJA1603 ICN → FSZ Jul 23, 06:25 UTCJul 23, 08:00 UTC1h 35m
2026-07-23 JJA1102 ICN → NRT Jul 23, 03:00 UTCJul 23, 04:55 UTC1h 55m
2026-07-22 JJA1101 NRT → ICN Jul 22, 23:30 UTCJul 23, 01:30 UTC2h 0m
2026-07-22 JJA2108 HKG → ICN Jul 22, 18:20 UTCJul 22, 21:45 UTC3h 25m
2026-07-22 JJA2107 ICN → CRK Jul 22, 13:25 UTCJul 22, 16:45 UTC3h 20m
2026-07-22 JJA1503 ICN → CTS Jul 22, 03:35 UTCJul 22, 05:25 UTC1h 50m
2026-07-22 JJA1396 KIX → ICN Jul 22, 00:10 UTCJul 22, 01:30 UTC1h 20m
2026-07-21 JJA1395 ICN → KIX Jul 21, 10:40 UTCJul 21, 12:05 UTC1h 25m
2026-07-21 JJA5204 - Jul 21, 08:10 UTCJul 21, 08:35 UTC25m
2026-07-21 JJA5203 ICN → UBN Jul 21, 01:35 UTCJul 21, 03:10 UTC1h 35m
2026-07-20 JJA6002 - Jul 20, 06:50 UTCJul 20, 10:05 UTC3h 15m
2026-07-20 JJA6001 ICN → MFM Jul 20, 03:40 UTCJul 20, 04:55 UTC1h 15m
2026-07-20 JJA6001 ICN → MFM Jul 20, 02:00 UTCJul 20, 02:40 UTC40m
2026-07-19 JJA2217 ICN → ICN Jul 19, 12:55 UTCJul 20, 00:10 UTC11h 15m
2026-07-19 JJA1172 NRT → ICN Jul 19, 08:40 UTCJul 19, 10:35 UTC1h 55m
2026-07-19 JJA1171 ICN → NRT Jul 19, 05:00 UTCJul 19, 07:00 UTC2h 0m
2026-07-19 JJA1282 NGO → ICN Jul 19, 01:45 UTCJul 19, 03:10 UTC1h 25m
2026-07-18 JJA1281 ICN → NGO Jul 18, 22:55 UTCJul 19, 00:20 UTC1h 25m
2026-07-18 JJA8904 - Jul 18, 12:20 UTCJul 18, 12:50 UTC30m
2026-07-18 JJA8903 - Jul 18, 07:10 UTCJul 18, 07:50 UTC40m
2026-07-18 JJA1102 NRT → ICN Jul 18, 02:55 UTCJul 18, 04:50 UTC1h 55m
2026-07-17 JJA1101 - Jul 17, 23:25 UTCJul 18, 01:20 UTC1h 55m
2026-07-17 JJA2104 - Jul 17, 15:55 UTCJul 17, 20:04 UTC4h 10m
2026-07-17 JJA2103 ICN → MNL Jul 17, 10:40 UTCJul 17, 14:15 UTC3h 35m
2026-07-17 JJA8802 SJW → ICN Jul 17, 06:05 UTCJul 17, 06:35 UTC30m
2026-07-17 JJA8801 ICN → SJW Jul 17, 01:35 UTCJul 17, 05:15 UTC3h 40m
2026-07-16 JJA2217 ICN → ICN Jul 16, 13:00 UTCJul 16, 23:55 UTC10h 55m
2026-07-16 JJA1172 NRT → ICN Jul 16, 08:45 UTCJul 16, 10:45 UTC2h 0m
2026-07-16 JJA1171 ICN → NRT Jul 16, 05:10 UTCJul 16, 07:15 UTC2h 5m
2026-07-16 JJA1602 - Jul 16, 01:15 UTCJul 16, 02:55 UTC1h 40m
2026-07-15 JJA1601 - Jul 15, 22:30 UTCJul 16, 00:00 UTC1h 30m
2026-07-15 JJA8972 - Jul 15, 12:10 UTCJul 15, 12:50 UTC40m
2026-07-15 JJA8971 - Jul 15, 06:30 UTCJul 15, 06:55 UTC25m
2026-07-15 JJA1612 HIJ → ICN Jul 15, 01:35 UTCJul 15, 02:40 UTC1h 5m
2026-07-14 JJA1611 ICN → HIJ Jul 14, 22:55 UTCJul 15, 00:05 UTC1h 10m
2026-07-14 JJA6002 - Jul 14, 06:40 UTCJul 14, 10:20 UTC3h 40m
2026-07-14 JJA6001 - Jul 14, 01:05 UTCJul 14, 04:00 UTC2h 55m
2026-07-13 JJA1604 - Jul 13, 09:30 UTCJul 13, 11:10 UTC1h 40m
2026-07-13 JJA1603 - Jul 13, 06:10 UTCJul 13, 07:45 UTC1h 35m
2026-07-13 JJA1304 - Jul 13, 03:10 UTCJul 13, 04:30 UTC1h 20m
2026-07-13 JJA1303 ICN → KIX Jul 13, 00:20 UTCJul 13, 01:40 UTC1h 20m
2026-07-12 JJA2202 - Jul 12, 18:55 UTCJul 12, 22:15 UTC3h 20m
2026-07-12 JJA2202 - Jul 12, 18:05 UTCJul 12, 18:15 UTC10m
2026-07-12 JJA2201 - Jul 12, 15:40 UTCJul 12, 15:50 UTC10m
2026-07-12 JJA2201 - Jul 12, 12:05 UTCJul 12, 12:25 UTC20m
2026-07-12 JJA1504 - Jul 12, 07:10 UTCJul 12, 09:25 UTC2h 15m
2026-07-12 JJA1503 ICN → CTS Jul 12, 03:30 UTCJul 12, 05:55 UTC2h 25m
2026-07-12 JJA1702 - Jul 12, 00:45 UTCJul 12, 02:01 UTC1h 15m
2026-07-11 JJA1701 - Jul 11, 22:15 UTCJul 11, 23:20 UTC1h 5m

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 HL8303 page for operator, model, and routing details .

Mode-S 71C303 frequently asked

What is Mode-S code 71C303?
71C303 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8303.
Where is Mode-S 71C303 registered?
Mode-S code 71C303 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 71C303 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C303, octal 34341403, decimal 7,455,491.
What flights does 71C303 operate?
Mode-S 71C303 has broadcast 20 distinct callsigns, including JJA1616, JJA1615, JJA6001, JJA1408, JJA6002.