sensors Mode-S transponder
71C042
ICAO 24-bit transponder address · allocated to Korea, South
Currently assigned to HL8042 · BOEING 777-300ER
- Hex
- 71C042
- Octal
- 34340102
- Decimal
- 7,454,786
- Country
- KR
- Tail
- HL8042
- Type
- B77W
- Flights observed
- 87
- Distinct callsigns
- 20
- Country
- KR
- Last broadcast
- 11h ago
Last known position
Country allocation
The ICAO 24-bit address 71C042 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 |
|---|---|---|---|
| KAL036 | Korean Air | 10 | 2026-05-08 |
| KAL908 | Korean Air | 9 | 2026-05-16 |
| KAL035 | Korean Air | 8 | 2026-05-08 |
| KAL907 | Korean Air | 7 | 2026-05-15 |
| KAL086 | Korean Air | 7 | 2026-05-12 |
| KAL094 | Korean Air | 6 | 2026-05-24 |
| KAL093 | Korean Air | 6 | 2026-05-24 |
| KAL085 | Korean Air | 6 | 2026-05-11 |
| KAL646 | Korean Air | 3 | 2026-05-28 |
| KAL937 | Korean Air | 2 | 2026-05-29 |
| KAL888 | Korean Air | 2 | 2026-05-21 |
| KAL645 | Korean Air | 2 | 2026-05-28 |
| KAL2021 | Korean Air | 2 | 2026-04-13 |
| KAL034 | Korean Air | 2 | 2026-05-17 |
| KAL033 | Korean Air | 2 | 2026-05-17 |
| KAL006 | - | 2 | 2026-05-26 |
| KAL005 | - | 2 | 2026-05-25 |
| KAL938 | Korean Air | 1 | 2026-05-29 |
| KAL882 | Korean Air | 1 | 2026-05-26 |
| KAL868 | Korean Air | 1 | 2026-05-22 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | KAL938 | VIE → ICN | May 29, 16:55 UTC | May 29, 18:25 UTC | 1h 30m |
| 2026-05-29 | KAL937 | ICN → VIE | May 29, 03:35 UTC | May 29, 14:50 UTC | 11h 15m |
| 2026-05-29 | KAL937 | ICN → VIE | May 29, 02:10 UTC | May 29, 02:30 UTC | 20m |
| 2026-05-28 | KAL646 | SIN → ICN | May 28, 20:50 UTC | May 28, 23:40 UTC | 2h 50m |
| 2026-05-28 | KAL646 | SIN → ICN | May 28, 17:55 UTC | May 28, 18:05 UTC | 10m |
| 2026-05-28 | KAL645 | PUS → CBO | May 28, 10:25 UTC | May 28, 13:20 UTC | 2h 55m |
| 2026-05-27 | KAL2028 | TPE → ICN | May 27, 11:05 UTC | May 27, 13:05 UTC | 2h 0m |
| 2026-05-27 | KAL2027 | ICN → TPE | May 27, 07:30 UTC | May 27, 09:40 UTC | 2h 10m |
| 2026-05-26 | KAL882 | PVG → ICN | May 26, 23:49 UTC | May 27, 05:04 UTC | 5h 15m |
| 2026-05-26 | KAL006 | LAS → ICN | May 26, 07:05 UTC | May 26, 19:45 UTC | 12h 40m |
| 2026-05-25 | KAL005 | ICN → LAS | May 25, 12:25 UTC | May 25, 23:00 UTC | 10h 34m |
| 2026-05-24 | KAL094 | IAD → ICN | May 24, 17:30 UTC | May 25, 07:30 UTC | 14h 0m |
| 2026-05-24 | KAL093 | ICN → IAD | May 24, 01:55 UTC | May 24, 15:05 UTC | 13h 10m |
| 2026-05-22 | KAL868 | CAN → ICN | May 22, 07:25 UTC | May 22, 08:00 UTC | 35m |
| 2026-05-22 | KAL867 | ICN → CAN | May 22, 00:15 UTC | May 22, 00:40 UTC | 25m |
| 2026-05-21 | KAL888 | PVG → ICN | May 21, 02:40 UTC | May 21, 07:50 UTC | 5h 10m |
| 2026-05-19 | KAL094 | IAD → ICN | May 19, 17:50 UTC | May 20, 08:35 UTC | 14h 46m |
| 2026-05-19 | KAL093 | ICN → IAD | May 19, 01:50 UTC | May 19, 14:55 UTC | 13h 5m |
| 2026-05-17 | KAL034 | ATL → ICN | May 17, 16:01 UTC | May 18, 06:10 UTC | 14h 10m |
| 2026-05-17 | KAL033 | ICN → ATL | May 17, 00:10 UTC | May 17, 13:20 UTC | 13h 10m |
| 2026-05-16 | KAL908 | LHR → ICN | May 16, 06:50 UTC | May 16, 07:11 UTC | 20m |
| 2026-05-15 | KAL908 | LHR → ICN | May 15, 19:05 UTC | May 16, 00:15 UTC | 5h 10m |
| 2026-05-15 | KAL907 | ICN → LHR | May 15, 11:20 UTC | May 15, 15:50 UTC | 4h 29m |
| 2026-05-15 | KAL907 | ICN → LHR | May 15, 02:40 UTC | May 15, 02:50 UTC | 10m |
| 2026-05-14 | KAL166 | WUH → ICN | May 14, 00:00 UTC | May 14, 06:50 UTC | 6h 50m |
| 2026-05-12 | KAL086 | JFK → ICN | May 12, 05:10 UTC | May 12, 19:55 UTC | 14h 45m |
| 2026-05-11 | KAL085 | ICN → JFK | May 11, 11:35 UTC | May 11, 22:35 UTC | 11h 0m |
| 2026-05-10 | KAL034 | ATL → ICN | May 10, 15:55 UTC | May 11, 06:50 UTC | 14h 55m |
| 2026-05-10 | KAL033 | ICN → ATL | May 10, 00:15 UTC | May 10, 12:59 UTC | 12h 45m |
| 2026-05-08 | KAL036 | ATL → ICN | May 8, 17:40 UTC | May 9, 09:05 UTC | 15h 25m |
| 2026-05-08 | KAL035 | ICN → ATL | May 8, 02:19 UTC | May 8, 15:05 UTC | 12h 45m |
| 2026-05-07 | KAL036 | ATL → ICN | May 7, 08:05 UTC | May 7, 08:35 UTC | 30m |
| 2026-05-06 | KAL036 | ATL → ICN | May 6, 17:35 UTC | May 7, 07:35 UTC | 14h 0m |
| 2026-05-06 | KAL035 | ICN → ATL | May 6, 02:10 UTC | May 6, 15:00 UTC | 12h 50m |
| 2026-05-05 | KAL646 | SIN → ICN | May 5, 21:05 UTC | May 5, 23:55 UTC | 2h 50m |
| 2026-05-05 | KAL645 | PUS → CBO | May 5, 10:10 UTC | May 5, 15:45 UTC | 5h 35m |
| 2026-05-04 | KAL908 | LHR → ICN | May 4, 19:05 UTC | May 5, 05:50 UTC | 10h 45m |
| 2026-05-04 | KAL907 | ICN → LHR | May 4, 03:45 UTC | May 4, 15:55 UTC | 12h 10m |
| 2026-05-03 | KAL888 | PVG → ICN | May 3, 02:40 UTC | May 3, 07:25 UTC | 4h 44m |
| 2026-05-02 | KAL006 | - | May 2, 07:10 UTC | May 2, 19:50 UTC | 12h 40m |
| 2026-05-01 | KAL005 | - | May 1, 12:30 UTC | May 1, 23:10 UTC | 10h 40m |
| 2026-04-30 | KAL036 | ATL → ICN | Apr 30, 17:45 UTC | May 1, 08:45 UTC | 15h 0m |
| 2026-04-30 | KAL035 | ICN → ATL | Apr 30, 02:10 UTC | Apr 30, 14:50 UTC | 12h 40m |
| 2026-04-29 | KAL086 | JFK → ICN | Apr 29, 05:35 UTC | Apr 29, 20:25 UTC | 14h 51m |
| 2026-04-28 | KAL085 | ICN → JFK | Apr 28, 11:35 UTC | Apr 29, 00:45 UTC | 13h 10m |
| 2026-04-27 | KAL094 | IAD → ICN | Apr 27, 17:45 UTC | Apr 28, 08:40 UTC | 14h 55m |
| 2026-04-27 | KAL093 | ICN → IAD | Apr 27, 01:50 UTC | Apr 27, 14:55 UTC | 13h 5m |
| 2026-04-25 | KAL094 | IAD → ICN | Apr 25, 17:30 UTC | Apr 26, 07:50 UTC | 14h 20m |
| 2026-04-25 | KAL093 | ICN → IAD | Apr 25, 01:50 UTC | Apr 25, 15:05 UTC | 13h 15m |
| 2026-04-24 | KAL602 | CEB → ICN | Apr 24, 11:45 UTC | Apr 24, 21:10 UTC | 9h 25m |
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 HL8042 page for operator, model, and routing details .