sensors Mode-S transponder
71C240
ICAO 24-bit transponder address · allocated to Korea, South
Currently assigned to HL8240 · BOEING 737-800
- Hex
- 71C240
- Octal
- 34341100
- Decimal
- 7,455,296
- Country
- KR
- Tail
- HL8240
- Type
- B738
- Flights observed
- 63
- Distinct callsigns
- 18
- Country
- KR
- Last broadcast
- 13h ago
Last known position
Country allocation
The ICAO 24-bit address 71C240 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 18 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| KAL418 | Korean Air | 17 | 2026-05-23 |
| KAL855 | Korean Air | 12 | 2026-05-22 |
| KAL856 | Korean Air | 11 | 2026-05-22 |
| KAL155 | Korean Air | 5 | 2026-05-27 |
| KAL620 | Korean Air | 2 | 2026-05-29 |
| KAL619 | Korean Air | 2 | 2026-05-29 |
| KAL417 | Korean Air | 2 | 2026-05-24 |
| KAL156 | Korean Air | 2 | 2026-05-25 |
| KAL806 | Korean Air | 1 | 2026-05-28 |
| KAL805 | Korean Air | 1 | 2026-05-28 |
| KAL197P | Korean Air | 1 | 2026-05-21 |
| KAL196F | Korean Air | 1 | 2026-05-21 |
| KAL1432 | Korean Air | 1 | 2026-05-28 |
| KAL1431 | Korean Air | 1 | 2026-05-28 |
| KAL1409 | Korean Air | 1 | 2026-05-08 |
| KAL1404 | Korean Air | 1 | 2026-05-08 |
| KAL134 | Korean Air | 1 | 2026-05-24 |
| KAL133 | Korean Air | 1 | 2026-05-23 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | KAL620 | HKG → ICN | May 29, 19:25 UTC | May 29, 22:55 UTC | 3h 30m |
| 2026-05-29 | KAL619 | ICN → HKG | May 29, 14:00 UTC | May 29, 17:40 UTC | 3h 40m |
| 2026-05-28 | KAL1432 | TAE → ICN | May 28, 23:05 UTC | May 28, 23:35 UTC | 30m |
| 2026-05-28 | KAL1431 | ICN → TAE | May 28, 10:30 UTC | May 28, 11:00 UTC | 30m |
| 2026-05-28 | KAL806 | TSN → ICN | May 28, 04:50 UTC | May 28, 05:20 UTC | 30m |
| 2026-05-28 | KAL805 | ICN → TSN | May 28, 00:35 UTC | May 28, 00:55 UTC | 20m |
| 2026-05-27 | KAL155 | ICN → HFE | May 27, 04:59 UTC | May 27, 10:25 UTC | 5h 25m |
| 2026-05-25 | KAL620 | HKG → ICN | May 25, 19:25 UTC | May 25, 22:49 UTC | 3h 25m |
| 2026-05-25 | KAL619 | ICN → HKG | May 25, 14:00 UTC | May 25, 17:35 UTC | 3h 35m |
| 2026-05-25 | KAL156 | HFE → ICN | May 25, 04:55 UTC | May 25, 10:25 UTC | 5h 30m |
| 2026-05-24 | KAL417 | ICN → GUM | May 24, 09:35 UTC | May 24, 21:00 UTC | 11h 25m |
| 2026-05-24 | KAL134 | CGO → ICN | May 24, 04:30 UTC | May 24, 04:50 UTC | 20m |
| 2026-05-23 | KAL133 | ICN → CGO | May 23, 23:15 UTC | May 23, 23:40 UTC | 25m |
| 2026-05-23 | KAL418 | GUM → ICN | May 23, 09:45 UTC | May 23, 20:20 UTC | 10h 36m |
| 2026-05-22 | KAL418 | GUM → ICN | May 22, 09:40 UTC | May 22, 20:30 UTC | 10h 50m |
| 2026-05-22 | KAL856 | PEK → ICN | May 22, 07:00 UTC | May 22, 07:30 UTC | 30m |
| 2026-05-22 | KAL855 | ICN → PEK | May 22, 02:10 UTC | May 22, 02:25 UTC | 15m |
| 2026-05-21 | KAL197P | GMP → ICN | May 21, 23:10 UTC | May 21, 23:35 UTC | 25m |
| 2026-05-21 | KAL196F | ICN → GMP | May 21, 12:45 UTC | May 21, 13:05 UTC | 20m |
| 2026-05-20 | KAL856 | PEK → ICN | May 20, 06:45 UTC | May 20, 07:25 UTC | 40m |
| 2026-05-20 | KAL855 | ICN → PEK | May 20, 02:10 UTC | May 20, 02:30 UTC | 20m |
| 2026-05-18 | KAL155 | ICN → HFE | May 18, 04:45 UTC | May 18, 10:15 UTC | 5h 30m |
| 2026-05-17 | KAL156 | HFE → ICN | May 17, 04:50 UTC | May 17, 10:50 UTC | 6h 0m |
| 2026-05-15 | KAL856 | PEK → ICN | May 15, 06:55 UTC | May 15, 07:15 UTC | 20m |
| 2026-05-15 | KAL855 | ICN → PEK | May 15, 02:15 UTC | May 15, 02:25 UTC | 10m |
| 2026-05-11 | KAL155 | ICN → HFE | May 11, 04:50 UTC | May 11, 10:25 UTC | 5h 35m |
| 2026-05-10 | KAL155 | ICN → HFE | May 10, 04:34 UTC | May 10, 10:00 UTC | 5h 25m |
| 2026-05-08 | KAL1404 | PUS → ICN | May 8, 23:10 UTC | May 8, 23:45 UTC | 35m |
| 2026-05-08 | KAL1409 | ICN → PUS | May 8, 11:05 UTC | May 8, 11:30 UTC | 25m |
| 2026-05-08 | KAL855 | ICN → PEK | May 8, 02:14 UTC | May 8, 02:24 UTC | 10m |
| 2026-05-06 | KAL418 | GUM → ICN | May 6, 09:45 UTC | May 6, 20:30 UTC | 10h 44m |
| 2026-05-06 | KAL856 | PEK → ICN | May 6, 05:50 UTC | May 6, 06:00 UTC | 10m |
| 2026-05-06 | KAL855 | ICN → PEK | May 6, 02:05 UTC | May 6, 02:15 UTC | 10m |
| 2026-05-04 | KAL155 | ICN → HFE | May 4, 04:44 UTC | May 4, 10:25 UTC | 5h 40m |
| 2026-05-01 | KAL418 | GUM → ICN | May 1, 09:45 UTC | May 1, 20:45 UTC | 11h 0m |
| 2026-05-01 | KAL855 | ICN → PEK | May 1, 02:15 UTC | May 1, 02:30 UTC | 15m |
| 2026-04-30 | KAL417 | ICN → GUM | Apr 30, 09:45 UTC | Apr 30, 20:15 UTC | 10h 30m |
| 2026-04-29 | KAL418 | GUM → ICN | Apr 29, 09:50 UTC | Apr 29, 20:20 UTC | 10h 30m |
| 2026-04-29 | KAL856 | PEK → ICN | Apr 29, 06:00 UTC | Apr 29, 06:10 UTC | 10m |
| 2026-04-29 | KAL855 | ICN → PEK | Apr 29, 02:05 UTC | Apr 29, 02:15 UTC | 10m |
| 2026-04-28 | KAL418 | GUM → ICN | Apr 28, 09:50 UTC | Apr 28, 20:35 UTC | 10h 45m |
| 2026-04-27 | KAL418 | GUM → ICN | Apr 27, 09:50 UTC | Apr 27, 20:30 UTC | 10h 40m |
| 2026-04-27 | KAL856 | PEK → ICN | Apr 27, 07:15 UTC | Apr 27, 07:25 UTC | 10m |
| 2026-04-27 | KAL856 | PEK → ICN | Apr 27, 06:15 UTC | Apr 27, 06:25 UTC | 10m |
| 2026-04-27 | KAL855 | ICN → PEK | Apr 27, 02:10 UTC | Apr 27, 02:30 UTC | 20m |
| 2026-04-26 | KAL418 | GUM → ICN | Apr 26, 09:45 UTC | Apr 26, 20:15 UTC | 10h 30m |
| 2026-04-25 | KAL418 | GUM → ICN | Apr 25, 09:45 UTC | Apr 25, 20:20 UTC | 10h 35m |
| 2026-04-24 | KAL418 | GUM → ICN | Apr 24, 09:50 UTC | Apr 24, 20:20 UTC | 10h 30m |
| 2026-04-23 | KAL418 | GUM → ICN | Apr 23, 09:40 UTC | Apr 23, 20:45 UTC | 11h 5m |
| 2026-04-22 | KAL418 | GUM → ICN | Apr 22, 09:45 UTC | Apr 22, 20:20 UTC | 10h 35m |
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 HL8240 page for operator, model, and routing details .