sensors Mode-S transponder
71CA11
ICAO 24-bit transponder address · allocated to Korea, South
- Hex
- 71CA11
- Octal
- 34345021
- Decimal
- 7,457,297
- Country
- KR
- Flights observed
- 32
- Distinct callsigns
- 1
- Country
- KR
- Last broadcast
- 3d ago
Last known position
Country allocation
The ICAO 24-bit address 71CA11 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 1 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| HL9211 | - | 32 | 2026-07-25 |
Recent flights last 32
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-25 | HL9211 | - | Jul 25, 04:20 UTC | Jul 25, 05:05 UTC | 45m |
| 2026-07-24 | HL9211 | - | Jul 24, 13:15 UTC | Jul 24, 14:05 UTC | 50m |
| 2026-07-24 | HL9211 | - | Jul 24, 07:25 UTC | Jul 24, 08:10 UTC | 45m |
| 2026-07-19 | HL9211 | - | Jul 19, 08:45 UTC | Jul 19, 09:45 UTC | 1h 0m |
| 2026-07-19 | HL9211 | - | Jul 19, 07:30 UTC | Jul 19, 08:40 UTC | 1h 10m |
| 2026-07-17 | HL9211 | - | Jul 17, 08:54 UTC | Jul 17, 09:50 UTC | 55m |
| 2026-07-17 | HL9211 | - | Jul 17, 05:45 UTC | Jul 17, 06:20 UTC | 35m |
| 2026-07-16 | HL9211 | - | Jul 16, 10:45 UTC | Jul 16, 11:30 UTC | 45m |
| 2026-07-14 | HL9211 | - | Jul 14, 05:00 UTC | Jul 14, 05:15 UTC | 15m |
| 2026-07-14 | HL9211 | - | Jul 14, 03:00 UTC | Jul 14, 03:10 UTC | 10m |
| 2026-06-29 | HL9211 | - | Jun 29, 00:20 UTC | Jun 29, 00:39 UTC | 20m |
| 2026-06-28 | HL9211 | - | Jun 28, 02:20 UTC | Jun 28, 03:25 UTC | 1h 5m |
| 2026-06-28 | HL9211 | - | Jun 28, 00:35 UTC | Jun 28, 01:19 UTC | 45m |
| 2026-06-27 | HL9211 | - | Jun 27, 05:25 UTC | Jun 27, 05:59 UTC | 35m |
| 2026-06-27 | HL9211 | - | Jun 27, 02:29 UTC | Jun 27, 03:30 UTC | 1h 0m |
| 2026-06-25 | HL9211 | - | Jun 25, 05:39 UTC | Jun 25, 06:14 UTC | 35m |
| 2026-06-23 | HL9211 | - | Jun 23, 06:15 UTC | Jun 23, 07:05 UTC | 50m |
| 2026-06-23 | HL9211 | - | Jun 23, 00:50 UTC | Jun 23, 02:04 UTC | 1h 15m |
| 2026-06-22 | HL9211 | - | Jun 22, 09:04 UTC | Jun 22, 09:30 UTC | 25m |
| 2026-06-22 | HL9211 | - | Jun 22, 07:14 UTC | Jun 22, 08:00 UTC | 45m |
| 2026-06-22 | HL9211 | - | Jun 22, 05:34 UTC | Jun 22, 05:44 UTC | 10m |
| 2026-06-22 | HL9211 | - | Jun 22, 04:15 UTC | Jun 22, 04:24 UTC | 10m |
| 2026-06-18 | HL9211 | - | Jun 18, 11:30 UTC | Jun 18, 12:25 UTC | 55m |
| 2026-06-18 | HL9211 | - | Jun 18, 08:15 UTC | Jun 18, 10:05 UTC | 1h 50m |
| 2026-06-16 | HL9211 | - | Jun 16, 11:05 UTC | Jun 16, 11:49 UTC | 45m |
| 2026-06-16 | HL9211 | - | Jun 16, 08:00 UTC | Jun 16, 08:10 UTC | 10m |
| 2026-06-14 | HL9211 | - | Jun 14, 11:15 UTC | Jun 14, 11:50 UTC | 35m |
| 2026-06-13 | HL9211 | - | Jun 13, 11:05 UTC | Jun 13, 13:00 UTC | 1h 55m |
| 2026-06-12 | HL9211 | - | Jun 12, 09:50 UTC | Jun 12, 10:40 UTC | 50m |
| 2026-06-12 | HL9211 | - | Jun 12, 01:35 UTC | Jun 12, 01:55 UTC | 20m |
| 2026-06-05 | HL9211 | - | Jun 5, 05:55 UTC | Jun 5, 06:35 UTC | 40m |
| 2026-06-04 | HL9211 | - | Jun 4, 01:25 UTC | Jun 4, 02:05 UTC | 40m |
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.