sensors Mode-S transponder
71C275
ICAO 24-bit transponder address · allocated to Korea, South
Currently assigned to HL8275 · BOEING 777-300ER
- Hex
- 71C275
- Octal
- 34341165
- Decimal
- 7,455,349
- Country
- KR
- Tail
- HL8275
- Type
- B77W
- Flights observed
- 119
- Distinct callsigns
- 20
- Country
- KR
- Last broadcast
- 6d ago
Last known position
Country allocation
The ICAO 24-bit address 71C275 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 |
|---|---|---|---|
| KAL438 | Korean Air | 12 | 2026-05-05 |
| KAL437 | Korean Air | 12 | 2026-05-05 |
| KAL091 | Korean Air | 9 | 2026-05-13 |
| KAL038 | Korean Air | 9 | 2026-05-18 |
| KAL037 | Korean Air | 9 | 2026-05-18 |
| KAL787 | Korean Air | 7 | 2026-05-22 |
| KAL476 | Korean Air | 7 | 2026-05-19 |
| KAL788 | Korean Air | 6 | 2026-05-23 |
| KAL092 | Korean Air | 6 | 2026-05-13 |
| KAL925 | Korean Air | 5 | 2026-05-03 |
| KAL946 | Korean Air | 4 | 2026-05-11 |
| KAL9982 | Korean Air | 3 | 2026-05-21 |
| KAL926 | Korean Air | 3 | 2026-05-03 |
| KAL9983 | Korean Air | 2 | 2026-05-20 |
| KAL945 | Korean Air | 2 | 2026-05-10 |
| KAL652 | Korean Air | 2 | 2026-05-15 |
| KAL651 | Korean Air | 2 | 2026-05-15 |
| KAL624 | Korean Air | 2 | 2026-04-24 |
| KAL623 | Korean Air | 2 | 2026-04-24 |
| KAL475 | Korean Air | 2 | 2026-04-17 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-23 | KAL193F | GMP → ICN | May 23, 22:20 UTC | May 23, 22:45 UTC | 25m |
| 2026-05-23 | KAL2028 | TPE → ICN | May 23, 11:15 UTC | May 23, 13:20 UTC | 2h 5m |
| 2026-05-23 | KAL2027 | ICN → TPE | May 23, 07:35 UTC | May 23, 09:50 UTC | 2h 15m |
| 2026-05-23 | KAL788 | FUK → ICN | May 23, 02:45 UTC | May 23, 03:25 UTC | 40m |
| 2026-05-22 | KAL787 | ICN → FUK | May 22, 23:40 UTC | May 23, 00:10 UTC | 30m |
| 2026-05-22 | KAL2012 | HKG → ICN | May 22, 17:15 UTC | May 22, 20:20 UTC | 3h 5m |
| 2026-05-22 | KAL2011 | ICN → HKG | May 22, 14:35 UTC | May 22, 14:45 UTC | 10m |
| 2026-05-22 | KAL2011 | ICN → HKG | May 22, 11:45 UTC | May 22, 14:00 UTC | 2h 15m |
| 2026-05-22 | KAL888 | PVG → ICN | May 22, 02:45 UTC | May 22, 07:50 UTC | 5h 5m |
| 2026-05-21 | KAL9982 | OSL → ICN | May 21, 08:00 UTC | May 21, 08:25 UTC | 25m |
| 2026-05-20 | KAL9982 | OSL → ICN | May 20, 22:35 UTC | May 21, 07:10 UTC | 8h 35m |
| 2026-05-20 | KAL2983 | ICN → TPE | May 20, 18:15 UTC | May 20, 19:05 UTC | 50m |
| 2026-05-20 | KAL9983 | ICN → TBS | May 20, 08:10 UTC | May 20, 16:15 UTC | 8h 5m |
| 2026-05-20 | KAL9983 | ICN → TBS | May 20, 06:50 UTC | May 20, 07:20 UTC | 30m |
| 2026-05-19 | KAL476 | SGN → ICN | May 19, 11:20 UTC | May 19, 22:25 UTC | 11h 5m |
| 2026-05-18 | KAL038 | ORD → ICN | May 18, 18:45 UTC | May 19, 09:15 UTC | 14h 30m |
| 2026-05-18 | KAL037 | ICN → ORD | May 18, 02:15 UTC | May 18, 14:55 UTC | 12h 40m |
| 2026-05-16 | KAL038 | ORD → ICN | May 16, 17:50 UTC | May 17, 07:40 UTC | 13h 50m |
| 2026-05-16 | KAL037 | ICN → ORD | May 16, 02:15 UTC | May 16, 14:51 UTC | 12h 36m |
| 2026-05-15 | KAL652 | BKK → ICN | May 15, 17:00 UTC | May 15, 22:00 UTC | 5h 0m |
| 2026-05-15 | KAL651 | ICN → BKK | May 15, 09:20 UTC | May 15, 14:25 UTC | 5h 5m |
| 2026-05-13 | KAL092 | BOS → ICN | May 13, 17:10 UTC | May 14, 07:35 UTC | 14h 25m |
| 2026-05-13 | KAL091 | ICN → BOS | May 13, 00:55 UTC | May 13, 14:30 UTC | 13h 35m |
| 2026-05-12 | KAL476 | SGN → ICN | May 12, 10:45 UTC | May 12, 22:01 UTC | 11h 15m |
| 2026-05-11 | KAL946 | FRA → ICN | May 11, 05:40 UTC | May 11, 06:00 UTC | 20m |
| 2026-05-10 | KAL946 | FRA → ICN | May 10, 18:39 UTC | May 10, 22:15 UTC | 3h 35m |
| 2026-05-10 | KAL945 | ICN → FRA | May 10, 02:24 UTC | May 10, 15:24 UTC | 13h 0m |
| 2026-05-09 | KAL142 | XIY → ICN | May 9, 07:20 UTC | May 9, 07:35 UTC | 15m |
| 2026-05-09 | KAL141 | ICN → XIY | May 9, 00:30 UTC | May 9, 06:20 UTC | 5h 50m |
| 2026-05-08 | KAL652 | BKK → ICN | May 8, 17:10 UTC | May 8, 21:50 UTC | 4h 40m |
| 2026-05-08 | KAL651 | ICN → BKK | May 8, 09:30 UTC | May 8, 14:45 UTC | 5h 15m |
| 2026-05-08 | KAL788 | FUK → ICN | May 8, 02:19 UTC | May 8, 03:19 UTC | 1h 0m |
| 2026-05-08 | KAL787 | ICN → FUK | May 8, 00:34 UTC | May 8, 00:44 UTC | 10m |
| 2026-05-07 | KAL787 | ICN → FUK | May 7, 23:29 UTC | May 7, 23:59 UTC | 30m |
| 2026-05-06 | KAL9982 | OSL → ICN | May 6, 19:00 UTC | May 7, 03:45 UTC | 8h 45m |
| 2026-05-06 | KAL9981 | ICN → ATH | May 6, 05:15 UTC | May 6, 16:45 UTC | 11h 30m |
| 2026-05-05 | KAL438 | CGK → ICN | May 5, 17:00 UTC | May 5, 22:01 UTC | 5h 0m |
| 2026-05-05 | KAL438 | CGK → ICN | May 5, 15:25 UTC | May 5, 15:35 UTC | 10m |
| 2026-05-05 | KAL437 | ICN → CGK | May 5, 12:55 UTC | May 5, 13:10 UTC | 15m |
| 2026-05-05 | KAL437 | ICN → CGK | May 5, 06:30 UTC | May 5, 11:30 UTC | 5h 0m |
| 2026-05-05 | KAL744 | NGO → ICN | May 5, 00:30 UTC | May 5, 01:55 UTC | 1h 25m |
| 2026-05-04 | KAL743 | ICN → NGO | May 4, 10:25 UTC | May 4, 11:35 UTC | 1h 10m |
| 2026-05-03 | KAL926 | AMS → ICN | May 3, 20:00 UTC | May 4, 06:45 UTC | 10h 45m |
| 2026-05-03 | KAL925 | ICN → AMS | May 3, 15:50 UTC | May 3, 15:55 UTC | 5m |
| 2026-05-03 | KAL925 | ICN → AMS | May 3, 04:25 UTC | May 3, 12:45 UTC | 8h 20m |
| 2026-05-03 | KAL925 | ICN → AMS | May 3, 03:15 UTC | May 3, 03:25 UTC | 10m |
| 2026-05-02 | KAL946 | FRA → ICN | May 2, 05:10 UTC | May 2, 05:20 UTC | 10m |
| 2026-05-01 | KAL946 | FRA → ICN | May 1, 18:05 UTC | May 2, 04:25 UTC | 10h 20m |
| 2026-05-01 | KAL945 | ICN → FRA | May 1, 03:35 UTC | May 1, 15:00 UTC | 11h 25m |
| 2026-04-30 | KAL438 | CGK → ICN | Apr 30, 17:15 UTC | Apr 30, 22:00 UTC | 4h 45m |
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 HL8275 page for operator, model, and routing details .