sensors Mode-S transponder
71C734
ICAO 24-bit transponder address · allocated to Korea, South
- Hex
- 71C734
- Octal
- 34343464
- Decimal
- 7,456,564
- Country
- KR
- Flights observed
- 80
- Distinct callsigns
- 20
- Country
- KR
- Last broadcast
- 2h ago
Last known position
Country allocation
The ICAO 24-bit address 71C734 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 |
|---|---|---|---|
| KAL053 | - | 11 | 2026-06-13 |
| KAL705 | Korean Air | 10 | 2026-05-27 |
| KAL706 | Korean Air | 9 | 2026-05-28 |
| KAL054 | - | 7 | 2026-06-13 |
| KAL072 | Korean Air | 5 | 2026-06-09 |
| KAL071 | Korean Air | 5 | 2026-06-09 |
| KAL724 | Korean Air | 4 | 2026-05-23 |
| KAL723 | Korean Air | 4 | 2026-05-23 |
| KAL076 | Korean Air | 4 | 2026-06-02 |
| KAL075 | Korean Air | 4 | 2026-06-01 |
| BOE281 | - | 4 | 2026-04-22 |
| KAL928 | Korean Air | 2 | 2026-05-25 |
| KAL704 | Korean Air | 2 | 2026-05-27 |
| KAL703 | Korean Air | 2 | 2026-05-27 |
| KAL927 | Korean Air | 1 | 2026-05-24 |
| KAL882 | Korean Air | 1 | 2026-06-07 |
| KAL752 | Korean Air | 1 | 2026-05-22 |
| KAL751 | Korean Air | 1 | 2026-05-22 |
| KAL100D | Korean Air | 1 | 2026-04-30 |
| KAL042 | Korean Air | 1 | 2026-06-08 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-13 | KAL054 | - | Jun 13, 23:25 UTC | Jun 14, 07:00 UTC | 7h 36m |
| 2026-06-13 | KAL053 | - | Jun 13, 20:00 UTC | Jun 13, 20:10 UTC | 10m |
| 2026-06-13 | KAL053 | - | Jun 13, 12:25 UTC | Jun 13, 14:20 UTC | 1h 55m |
| 2026-06-12 | KAL054 | HNL → ICN | Jun 12, 23:25 UTC | Jun 13, 08:25 UTC | 8h 59m |
| 2026-06-12 | KAL053 | - | Jun 12, 19:45 UTC | Jun 12, 19:55 UTC | 10m |
| 2026-06-12 | KAL053 | - | Jun 12, 12:20 UTC | Jun 12, 14:05 UTC | 1h 45m |
| 2026-06-11 | KAL054 | HNL → ICN | Jun 11, 23:30 UTC | Jun 12, 08:35 UTC | 9h 5m |
| 2026-06-11 | KAL053 | ICN → HNL | Jun 11, 12:25 UTC | Jun 11, 14:05 UTC | 1h 40m |
| 2026-06-10 | KAL054 | HNL → ICN | Jun 10, 23:35 UTC | Jun 11, 08:35 UTC | 9h 0m |
| 2026-06-10 | KAL053 | ICN → HNL | Jun 10, 12:15 UTC | Jun 10, 14:00 UTC | 1h 45m |
| 2026-06-09 | KAL072 | YVR → ICN | Jun 9, 22:15 UTC | Jun 10, 09:20 UTC | 11h 5m |
| 2026-06-09 | KAL071 | ICN → YVR | Jun 9, 10:10 UTC | Jun 9, 19:45 UTC | 9h 35m |
| 2026-06-08 | KAL042 | SEA → ICN | Jun 8, 20:40 UTC | Jun 9, 07:50 UTC | 11h 10m |
| 2026-06-08 | KAL041 | ICN → SEA | Jun 8, 08:05 UTC | Jun 8, 17:15 UTC | 9h 10m |
| 2026-06-07 | KAL882 | PVG → ICN | Jun 7, 23:55 UTC | Jun 8, 05:00 UTC | 5h 5m |
| 2026-06-06 | KAL054 | HNL → ICN | Jun 6, 23:30 UTC | Jun 7, 08:55 UTC | 9h 25m |
| 2026-06-06 | KAL053 | ICN → HNL | Jun 6, 12:35 UTC | Jun 6, 20:19 UTC | 7h 45m |
| 2026-06-05 | KAL054 | HNL → ICN | Jun 5, 23:40 UTC | Jun 6, 09:04 UTC | 9h 25m |
| 2026-06-05 | KAL053 | ICN → HNL | Jun 5, 19:55 UTC | Jun 5, 20:10 UTC | 15m |
| 2026-06-05 | KAL053 | ICN → HNL | Jun 5, 12:25 UTC | Jun 5, 14:00 UTC | 1h 35m |
| 2026-06-04 | KAL054 | HNL → ICN | Jun 4, 23:35 UTC | Jun 5, 09:00 UTC | 9h 25m |
| 2026-06-04 | KAL053 | ICN → HNL | Jun 4, 19:40 UTC | Jun 4, 20:00 UTC | 20m |
| 2026-06-04 | KAL053 | ICN → HNL | Jun 4, 12:25 UTC | Jun 4, 14:00 UTC | 1h 35m |
| 2026-06-03 | KAL072 | YVR → ICN | Jun 3, 22:15 UTC | Jun 4, 08:30 UTC | 10h 15m |
| 2026-06-03 | KAL071 | ICN → YVR | Jun 3, 10:10 UTC | Jun 3, 19:45 UTC | 9h 35m |
| 2026-06-02 | KAL076 | YVR → ICN | Jun 2, 08:15 UTC | Jun 2, 18:05 UTC | 9h 50m |
| 2026-06-01 | KAL075 | ICN → YVR | Jun 1, 14:00 UTC | Jun 1, 23:20 UTC | 9h 20m |
| 2026-05-31 | KAL072 | YVR → ICN | May 31, 22:00 UTC | Jun 1, 08:20 UTC | 10h 20m |
| 2026-05-31 | KAL071 | ICN → YVR | May 31, 10:15 UTC | May 31, 19:25 UTC | 9h 10m |
| 2026-05-30 | KAL076 | YVR → ICN | May 30, 08:10 UTC | May 30, 18:55 UTC | 10h 45m |
| 2026-05-29 | KAL075 | ICN → YVR | May 29, 14:25 UTC | May 29, 23:25 UTC | 9h 1m |
| 2026-05-28 | KAL072 | YVR → ICN | May 28, 21:55 UTC | May 29, 09:05 UTC | 11h 10m |
| 2026-05-28 | KAL071 | ICN → YVR | May 28, 10:10 UTC | May 28, 19:25 UTC | 9h 15m |
| 2026-05-28 | KAL706 | NRT → ICN | May 28, 00:30 UTC | May 28, 02:30 UTC | 2h 0m |
| 2026-05-27 | KAL705 | ICN → NRT | May 27, 10:10 UTC | May 27, 11:55 UTC | 1h 45m |
| 2026-05-27 | KAL704 | NRT → ICN | May 27, 05:29 UTC | May 27, 07:30 UTC | 2h 1m |
| 2026-05-27 | KAL703 | ICN → NRT | May 27, 01:39 UTC | May 27, 03:34 UTC | 1h 55m |
| 2026-05-26 | KAL076 | YVR → ICN | May 26, 08:10 UTC | May 26, 18:40 UTC | 10h 30m |
| 2026-05-25 | KAL075 | ICN → YVR | May 25, 14:00 UTC | May 25, 23:10 UTC | 9h 10m |
| 2026-05-25 | KAL928 | MXP → ICN | May 25, 07:25 UTC | May 25, 07:50 UTC | 25m |
| 2026-05-24 | KAL928 | MXP → ICN | May 24, 20:40 UTC | May 24, 21:45 UTC | 1h 5m |
| 2026-05-24 | KAL927 | ICN → MXP | May 24, 04:50 UTC | May 24, 17:15 UTC | 12h 25m |
| 2026-05-24 | KAL706 | NRT → ICN | May 24, 00:35 UTC | May 24, 02:30 UTC | 1h 55m |
| 2026-05-23 | KAL705 | ICN → NRT | May 23, 09:55 UTC | May 23, 11:45 UTC | 1h 50m |
| 2026-05-23 | KAL724 | KIX → ICN | May 23, 04:15 UTC | May 23, 05:50 UTC | 1h 35m |
| 2026-05-23 | KAL723 | ICN → KIX | May 23, 01:10 UTC | May 23, 02:30 UTC | 1h 20m |
| 2026-05-22 | KAL752 | NGO → ICN | May 22, 17:35 UTC | May 22, 19:20 UTC | 1h 45m |
| 2026-05-22 | KAL751 | ICN → NGO | May 22, 11:55 UTC | May 22, 13:40 UTC | 1h 45m |
| 2026-05-22 | KAL704 | NRT → ICN | May 22, 05:30 UTC | May 22, 07:25 UTC | 1h 55m |
| 2026-05-22 | KAL703 | ICN → NRT | May 22, 01:35 UTC | May 22, 03:30 UTC | 1h 55m |
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.