sensors Mode-S transponder
71C217
ICAO 24-bit transponder address · allocated to Korea, South
Currently assigned to HL8217 · BOEING 777-300ER
- Hex
- 71C217
- Octal
- 34341027
- Decimal
- 7,455,255
- Country
- KR
- Tail
- HL8217
- Type
- B77W
- Flights observed
- 116
- Distinct callsigns
- 20
- Country
- KR
- Last broadcast
- 1h ago
Last known position
Country allocation
The ICAO 24-bit address 71C217 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 |
|---|---|---|---|
| KAL037 | Korean Air | 9 | 2026-05-28 |
| KAL092 | Korean Air | 8 | 2026-05-24 |
| KAL091 | Korean Air | 8 | 2026-05-24 |
| KAL925 | Korean Air | 7 | 2026-05-12 |
| KAL787 | Korean Air | 7 | 2026-05-26 |
| KAL038 | Korean Air | 7 | 2026-05-28 |
| KAL788 | Korean Air | 6 | 2026-05-27 |
| KAL437 | Korean Air | 6 | 2026-05-19 |
| KAL926 | Korean Air | 5 | 2026-05-12 |
| KAL475 | Korean Air | 5 | 2026-05-23 |
| KAL438 | Korean Air | 5 | 2026-05-19 |
| KAL644 | Korean Air | 4 | 2026-05-26 |
| KAL643 | Korean Air | 4 | 2026-05-26 |
| KAL623 | Korean Air | 4 | 2026-04-21 |
| KAL476 | Korean Air | 4 | 2026-05-15 |
| KAL652 | Korean Air | 3 | 2026-05-27 |
| KAL651 | Korean Air | 3 | 2026-05-27 |
| KAL624 | Korean Air | 3 | 2026-04-21 |
| KAL946 | Korean Air | 2 | 2026-05-18 |
| KAL945 | Korean Air | 2 | 2026-05-17 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | KAL901 | ICN → CDG | May 30, 02:45 UTC | May 30, 04:20 UTC | 1h 35m |
| 2026-05-28 | KAL038 | ORD → ICN | May 28, 17:50 UTC | May 29, 08:00 UTC | 14h 10m |
| 2026-05-28 | KAL037 | ICN → ORD | May 28, 02:15 UTC | May 28, 14:45 UTC | 12h 30m |
| 2026-05-27 | KAL652 | BKK → ICN | May 27, 17:10 UTC | May 27, 22:00 UTC | 4h 50m |
| 2026-05-27 | KAL651 | ICN → BKK | May 27, 09:40 UTC | May 27, 14:25 UTC | 4h 45m |
| 2026-05-27 | KAL788 | FUK → ICN | May 27, 01:59 UTC | May 27, 02:59 UTC | 1h 0m |
| 2026-05-26 | KAL787 | ICN → FUK | May 26, 23:25 UTC | May 26, 23:54 UTC | 30m |
| 2026-05-26 | KAL644 | SIN → ICN | May 26, 17:09 UTC | May 26, 20:05 UTC | 2h 55m |
| 2026-05-26 | KAL643 | ICN → SIN | May 26, 05:10 UTC | May 26, 10:29 UTC | 5h 20m |
| 2026-05-26 | KAL788 | FUK → ICN | May 26, 02:19 UTC | May 26, 03:15 UTC | 55m |
| 2026-05-25 | KAL787 | ICN → FUK | May 25, 23:19 UTC | May 25, 23:54 UTC | 35m |
| 2026-05-24 | KAL092 | BOS → ICN | May 24, 17:20 UTC | May 25, 07:20 UTC | 14h 0m |
| 2026-05-24 | KAL091 | ICN → BOS | May 24, 00:45 UTC | May 24, 14:05 UTC | 13h 20m |
| 2026-05-23 | KAL475 | ICN → SGN | May 23, 10:30 UTC | May 23, 22:25 UTC | 11h 56m |
| 2026-05-22 | KAL038 | ORD → ICN | May 22, 17:45 UTC | May 23, 08:00 UTC | 14h 15m |
| 2026-05-22 | KAL037 | ICN → ORD | May 22, 02:00 UTC | May 22, 14:00 UTC | 12h 0m |
| 2026-05-21 | KAL475 | ICN → SGN | May 21, 10:20 UTC | May 21, 22:15 UTC | 11h 55m |
| 2026-05-20 | KAL038 | ORD → ICN | May 20, 17:45 UTC | May 21, 07:40 UTC | 13h 55m |
| 2026-05-20 | KAL037 | ICN → ORD | May 20, 02:15 UTC | May 20, 13:55 UTC | 11h 41m |
| 2026-05-19 | KAL438 | CGK → ICN | May 19, 16:55 UTC | May 19, 22:10 UTC | 5h 15m |
| 2026-05-19 | KAL438 | CGK → ICN | May 19, 15:15 UTC | May 19, 15:25 UTC | 10m |
| 2026-05-19 | KAL437 | ICN → CGK | May 19, 12:50 UTC | May 19, 13:10 UTC | 20m |
| 2026-05-19 | KAL437 | ICN → CGK | May 19, 06:40 UTC | May 19, 11:30 UTC | 4h 50m |
| 2026-05-18 | KAL946 | FRA → ICN | May 18, 04:51 UTC | May 18, 05:20 UTC | 30m |
| 2026-05-17 | KAL946 | FRA → ICN | May 17, 18:10 UTC | May 18, 04:05 UTC | 9h 55m |
| 2026-05-17 | KAL945 | ICN → FRA | May 17, 10:55 UTC | May 17, 15:10 UTC | 4h 15m |
| 2026-05-17 | KAL945 | ICN → FRA | May 17, 02:20 UTC | May 17, 02:35 UTC | 15m |
| 2026-05-16 | KAL601 | ICN → CEB | May 16, 11:25 UTC | May 16, 21:25 UTC | 10h 0m |
| 2026-05-15 | KAL476 | SGN → ICN | May 15, 10:20 UTC | May 15, 21:55 UTC | 11h 34m |
| 2026-05-14 | KAL038 | ORD → ICN | May 14, 17:45 UTC | May 15, 06:35 UTC | 12h 50m |
| 2026-05-14 | KAL037 | ICN → ORD | May 14, 02:10 UTC | May 14, 14:40 UTC | 12h 30m |
| 2026-05-13 | KAL652 | BKK → ICN | May 13, 16:55 UTC | May 13, 21:35 UTC | 4h 40m |
| 2026-05-13 | KAL651 | ICN → BKK | May 13, 09:35 UTC | May 13, 14:40 UTC | 5h 5m |
| 2026-05-12 | KAL926 | AMS → ICN | May 12, 19:55 UTC | May 12, 22:15 UTC | 2h 20m |
| 2026-05-12 | KAL925 | ICN → AMS | May 12, 12:00 UTC | May 12, 16:40 UTC | 4h 40m |
| 2026-05-12 | KAL925 | ICN → AMS | May 12, 03:30 UTC | May 12, 03:40 UTC | 10m |
| 2026-05-11 | KAL476 | SGN → ICN | May 11, 10:30 UTC | May 11, 22:05 UTC | 11h 36m |
| 2026-05-10 | KAL652 | BKK → ICN | May 10, 17:20 UTC | May 10, 21:54 UTC | 4h 35m |
| 2026-05-10 | KAL651 | ICN → BKK | May 10, 09:55 UTC | May 10, 14:54 UTC | 5h 0m |
| 2026-05-09 | KAL038 | ORD → ICN | May 9, 17:40 UTC | May 10, 07:30 UTC | 13h 50m |
| 2026-05-09 | KAL037 | ICN → ORD | May 9, 02:10 UTC | May 9, 14:05 UTC | 11h 55m |
| 2026-05-08 | KAL476 | SGN → ICN | May 8, 10:29 UTC | May 8, 22:05 UTC | 11h 35m |
| 2026-05-07 | KAL926 | AMS → ICN | May 7, 20:05 UTC | May 8, 06:30 UTC | 10h 25m |
| 2026-05-07 | KAL925 | ICN → AMS | May 7, 03:30 UTC | May 7, 16:45 UTC | 13h 15m |
| 2026-05-05 | KAL926 | AMS → ICN | May 5, 20:15 UTC | May 6, 06:50 UTC | 10h 35m |
| 2026-05-05 | KAL925 | ICN → AMS | May 5, 04:25 UTC | May 5, 16:25 UTC | 12h 0m |
| 2026-05-05 | KAL925 | ICN → AMS | May 5, 03:15 UTC | May 5, 03:30 UTC | 15m |
| 2026-05-04 | KAL475 | ICN → SGN | May 4, 10:20 UTC | May 4, 22:15 UTC | 11h 56m |
| 2026-05-04 | KAL788 | FUK → ICN | May 4, 02:00 UTC | May 4, 03:05 UTC | 1h 5m |
| 2026-05-03 | KAL787 | ICN → FUK | May 3, 23:25 UTC | May 4, 00:30 UTC | 1h 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 HL8217 page for operator, model, and routing details .