Apparatus

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sensors Mode-S transponder

71C549

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

Currently assigned to HL8549 · BOEING 737-800

Hex
71C549
Octal
34342511
Decimal
7,456,073
Country
KR
Tail
HL8549
Type
B738
No current signal · last broadcast Jul 26, 21:25 UTC
Flights observed
557
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 21:25 UTC

Last known position

Most recent position reported by Mode-S 71C549.

Country allocation

The ICAO 24-bit address 71C549 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
ESR715 Eastar Jet 27 2026-06-13
ESR712 - 26 2026-06-12
ESR886 Eastar Jet 24 2026-06-12
ESR885 Eastar Jet 24 2026-06-12
ESR984 Eastar Jet 15 2026-07-26
ESR204 - 15 2026-07-11
ESR983 Eastar Jet 13 2026-07-26
ESR751 Eastar Jet 13 2026-06-12
ESR281 - 13 2026-07-12
ESR214 - 12 2026-07-12
ESR275 - 11 2026-07-13
ESR232 - 11 2026-07-12
ESR231 - 11 2026-07-12
ESR887 Eastar Jet 10 2026-04-30
ESR205 - 10 2026-07-14
ESR278 - 9 2026-07-13
ESR276 - 9 2026-07-13
ESR222 - 9 2026-07-12
ESR964 Eastar Jet 8 2026-07-26
ESR752 Eastar Jet 8 2026-06-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ESR984 TPE → PUS Jul 26, 20:30 UTCJul 26, 21:20 UTC50m
2026-07-26 ESR984 TPE → PUS Jul 26, 18:55 UTCJul 26, 19:15 UTC20m
2026-07-26 ESR983 PUS → TPE Jul 26, 13:50 UTCJul 26, 15:40 UTC1h 50m
2026-07-26 ESR952 CTS → PUS Jul 26, 08:50 UTCJul 26, 10:55 UTC2h 5m
2026-07-26 ESR951 PUS → CTS Jul 26, 05:20 UTCJul 26, 07:20 UTC2h 1m
2026-07-26 ESR964 OKA → PUS Jul 26, 03:15 UTCJul 26, 03:45 UTC30m
2026-07-26 ESR964 OKA → PUS Jul 26, 02:10 UTCJul 26, 02:25 UTC15m
2026-07-25 ESR963 PUS → OKA Jul 25, 23:00 UTCJul 26, 00:25 UTC1h 25m
2026-07-25 ESR984 TPE → PUS Jul 25, 19:00 UTCJul 25, 21:15 UTC2h 15m
2026-07-25 ESR983 PUS → TPE Jul 25, 15:20 UTCJul 25, 15:40 UTC20m
2026-07-25 ESR983 PUS → TPE Jul 25, 13:50 UTCJul 25, 14:10 UTC20m
2026-07-25 ESR944 FUK → PUS Jul 25, 08:10 UTCJul 25, 08:40 UTC30m
2026-07-25 ESR943 PUS → FUK Jul 25, 06:20 UTCJul 25, 06:55 UTC35m
2026-07-25 ESR914 KIX → PUS Jul 25, 03:55 UTCJul 25, 05:05 UTC1h 10m
2026-07-25 ESR913 PUS → KIX Jul 25, 01:05 UTCJul 25, 02:05 UTC1h 0m
2026-07-24 ESR988 TPE → PUS Jul 24, 18:50 UTCJul 24, 21:05 UTC2h 15m
2026-07-24 ESR987 PUS → TPE Jul 24, 15:35 UTCJul 24, 16:10 UTC35m
2026-07-24 ESR987 PUS → TPE Jul 24, 14:00 UTCJul 24, 14:25 UTC25m
2026-07-24 ESR952 CTS → PUS Jul 24, 10:40 UTCJul 24, 12:40 UTC2h 0m
2026-07-24 ESR951 PUS → CTS Jul 24, 06:20 UTCJul 24, 08:25 UTC2h 5m
2026-07-24 ESR914 KIX → PUS Jul 24, 03:40 UTCJul 24, 04:50 UTC1h 10m
2026-07-24 ESR913 PUS → KIX Jul 24, 01:05 UTCJul 24, 02:05 UTC1h 0m
2026-07-23 ESR984 TPE → PUS Jul 23, 20:20 UTCJul 23, 21:10 UTC50m
2026-07-23 ESR984 TPE → PUS Jul 23, 18:55 UTCJul 23, 19:15 UTC20m
2026-07-23 ESR983 PUS → TPE Jul 23, 13:55 UTCJul 23, 15:50 UTC1h 55m
2026-07-23 ESR944 FUK → PUS Jul 23, 08:15 UTCJul 23, 08:45 UTC30m
2026-07-23 ESR943 PUS → FUK Jul 23, 06:00 UTCJul 23, 06:40 UTC40m
2026-07-23 ESR964 - Jul 23, 03:45 UTCJul 23, 04:05 UTC20m
2026-07-23 ESR964 - Jul 23, 02:40 UTCJul 23, 02:55 UTC15m
2026-07-22 ESR963 PUS → OKA Jul 22, 23:10 UTCJul 23, 00:40 UTC1h 30m
2026-07-22 ESR984 TPE → PUS Jul 22, 18:55 UTCJul 22, 21:10 UTC2h 15m
2026-07-22 ESR983 PUS → TPE Jul 22, 13:50 UTCJul 22, 15:35 UTC1h 45m
2026-07-21 ESR985 PUS → PUS Jul 21, 22:25 UTCJul 22, 04:30 UTC6h 5m
2026-07-21 ESR944 FUK → PUS Jul 21, 08:25 UTCJul 21, 08:55 UTC30m
2026-07-21 ESR943 PUS → FUK Jul 21, 05:55 UTCJul 21, 06:35 UTC40m
2026-07-21 ESR914 KIX → PUS Jul 21, 03:35 UTCJul 21, 04:40 UTC1h 5m
2026-07-21 ESR913 PUS → KIX Jul 21, 01:20 UTCJul 21, 02:20 UTC1h 0m
2026-07-20 ESR988 TPE → PUS Jul 20, 20:25 UTCJul 20, 21:15 UTC50m
2026-07-20 ESR988 TPE → PUS Jul 20, 19:00 UTCJul 20, 19:25 UTC25m
2026-07-20 ESR987 PUS → TPE Jul 20, 13:50 UTCJul 20, 15:40 UTC1h 50m
2026-07-20 ESR944 - Jul 20, 08:10 UTCJul 20, 08:35 UTC25m
2026-07-20 ESR943 PUS → FUK Jul 20, 06:05 UTCJul 20, 06:35 UTC30m
2026-07-19 ESR985 PUS → PUS Jul 19, 22:20 UTCJul 20, 04:25 UTC6h 5m
2026-07-19 ESR984 - Jul 19, 20:25 UTCJul 19, 21:15 UTC50m
2026-07-19 ESR984 - Jul 19, 18:55 UTCJul 19, 19:20 UTC25m
2026-07-19 ESR983 PUS → TPE Jul 19, 13:45 UTCJul 19, 15:35 UTC1h 50m
2026-07-19 ESR916 KIX → PUS Jul 19, 07:20 UTCJul 19, 08:20 UTC1h 0m
2026-07-19 ESR915 PUS → KIX Jul 19, 04:40 UTCJul 19, 05:55 UTC1h 15m
2026-07-19 ESR942 - Jul 19, 02:00 UTCJul 19, 02:35 UTC35m
2026-07-19 ESR941 PUS → FUK Jul 19, 00:10 UTCJul 19, 00:30 UTC20m

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 HL8549 page for operator, model, and routing details .

Mode-S 71C549 frequently asked

What is Mode-S code 71C549?
71C549 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8549.
Where is Mode-S 71C549 registered?
Mode-S code 71C549 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 71C549 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C549, octal 34342511, decimal 7,456,073.
What flights does 71C549 operate?
Mode-S 71C549 has broadcast 20 distinct callsigns, including ESR715, ESR712, ESR886, ESR885, ESR984.