sensors Mode-S transponder
71C704
ICAO 24-bit transponder address · allocated to Korea, South
Currently assigned to HL8704 · BOEING 787-9 Dreamliner
- Hex
- 71C704
- Octal
- 34343404
- Decimal
- 7,456,516
- Country
- KR
- Tail
- HL8704
- Type
- B789
- Flights observed
- 105
- Distinct callsigns
- 17
- Country
- KR
- Last broadcast
- 8h ago
Current position
Country allocation
The ICAO 24-bit address 71C704 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 17 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| APZ801 | Air Premiea | 24 | 2026-05-29 |
| APZ802 | Air Premiea | 17 | 2026-05-29 |
| APZ152 | Air Premiea | 9 | 2026-05-11 |
| APZ151 | Air Premiea | 8 | 2026-05-10 |
| APZ104 | Air Premiea | 7 | 2026-05-30 |
| APZ103 | Air Premiea | 7 | 2026-05-29 |
| APZ111 | Air Premiea | 5 | 2026-05-22 |
| APZ736 | Air Premiea | 4 | 2026-05-24 |
| APZ735 | Air Premiea | 4 | 2026-05-24 |
| APZ601 | - | 4 | 2026-04-14 |
| APZ112 | Air Premiea | 4 | 2026-05-22 |
| APZ602 | - | 3 | 2026-04-14 |
| APZ136 | Air Premiea | 2 | 2026-05-15 |
| APZ135 | Air Premiea | 2 | 2026-05-15 |
| APZ132 | Air Premiea | 2 | 2026-05-18 |
| APZ131 | Air Premiea | 2 | 2026-05-17 |
| APZ734 | - | 1 | 2026-04-14 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | APZ104 | LAX → ICN | May 30, 07:15 UTC | May 30, 09:00 UTC | 1h 45m |
| 2026-05-29 | APZ103 | ICN → LAX | May 29, 13:20 UTC | May 29, 23:55 UTC | 10h 35m |
| 2026-05-29 | APZ802 | HKG → ICN | May 29, 05:50 UTC | May 29, 08:55 UTC | 3h 5m |
| 2026-05-29 | APZ801 | ICN → HKG | May 29, 00:45 UTC | May 29, 03:40 UTC | 2h 55m |
| 2026-05-28 | APZ104 | LAX → ICN | May 28, 06:50 UTC | May 28, 19:40 UTC | 12h 50m |
| 2026-05-27 | APZ103 | ICN → LAX | May 27, 13:25 UTC | May 28, 00:15 UTC | 10h 50m |
| 2026-05-27 | APZ802 | HKG → ICN | May 27, 05:45 UTC | May 27, 08:55 UTC | 3h 11m |
| 2026-05-27 | APZ801 | ICN → HKG | May 27, 00:59 UTC | May 27, 03:50 UTC | 2h 50m |
| 2026-05-26 | APZ104 | LAX → ICN | May 26, 06:44 UTC | May 26, 19:25 UTC | 12h 40m |
| 2026-05-25 | APZ103 | ICN → LAX | May 25, 13:20 UTC | May 25, 23:54 UTC | 10h 34m |
| 2026-05-25 | APZ802 | HKG → ICN | May 25, 05:40 UTC | May 25, 08:55 UTC | 3h 15m |
| 2026-05-25 | APZ801 | ICN → HKG | May 25, 02:10 UTC | May 25, 03:35 UTC | 1h 25m |
| 2026-05-24 | APZ736 | NRT → ICN | May 24, 09:20 UTC | May 24, 11:20 UTC | 2h 0m |
| 2026-05-24 | APZ735 | ICN → NRT | May 24, 05:00 UTC | May 24, 07:00 UTC | 2h 0m |
| 2026-05-22 | APZ112 | SFO → ICN | May 22, 23:05 UTC | May 23, 11:05 UTC | 11h 59m |
| 2026-05-22 | APZ111 | ICN → SFO | May 22, 09:10 UTC | May 22, 18:55 UTC | 9h 45m |
| 2026-05-21 | APZ104 | LAX → ICN | May 21, 06:35 UTC | May 21, 19:35 UTC | 13h 0m |
| 2026-05-20 | APZ103 | ICN → LAX | May 20, 13:20 UTC | May 20, 23:40 UTC | 10h 20m |
| 2026-05-20 | APZ802 | HKG → ICN | May 20, 08:15 UTC | May 20, 08:55 UTC | 40m |
| 2026-05-20 | APZ802 | HKG → ICN | May 20, 05:45 UTC | May 20, 07:00 UTC | 1h 15m |
| 2026-05-20 | APZ801 | ICN → HKG | May 20, 03:25 UTC | May 20, 03:40 UTC | 15m |
| 2026-05-20 | APZ801 | ICN → HKG | May 20, 00:45 UTC | May 20, 02:50 UTC | 2h 5m |
| 2026-05-19 | APZ736 | NRT → ICN | May 19, 09:15 UTC | May 19, 11:05 UTC | 1h 50m |
| 2026-05-19 | APZ735 | ICN → NRT | May 19, 05:00 UTC | May 19, 07:05 UTC | 2h 5m |
| 2026-05-18 | APZ132 | EWR → ICN | May 18, 05:20 UTC | May 18, 19:55 UTC | 14h 34m |
| 2026-05-17 | APZ131 | ICN → EWR | May 17, 12:50 UTC | May 18, 02:05 UTC | 13h 15m |
| 2026-05-17 | APZ802 | HKG → ICN | May 17, 05:50 UTC | May 17, 08:55 UTC | 3h 5m |
| 2026-05-17 | APZ801 | ICN → HKG | May 17, 03:20 UTC | May 17, 03:40 UTC | 20m |
| 2026-05-17 | APZ801 | ICN → HKG | May 17, 00:40 UTC | May 17, 02:45 UTC | 2h 5m |
| 2026-05-15 | APZ136 | IAD → ICN | May 15, 17:35 UTC | May 16, 07:55 UTC | 14h 21m |
| 2026-05-15 | APZ135 | ICN → IAD | May 15, 01:20 UTC | May 15, 14:50 UTC | 13h 29m |
| 2026-05-13 | APZ136 | IAD → ICN | May 13, 17:45 UTC | May 14, 08:00 UTC | 14h 15m |
| 2026-05-13 | APZ135 | ICN → IAD | May 13, 01:20 UTC | May 13, 14:40 UTC | 13h 20m |
| 2026-05-11 | APZ152 | HNL → ICN | May 11, 07:50 UTC | May 11, 10:15 UTC | 2h 25m |
| 2026-05-11 | APZ152 | HNL → ICN | May 11, 00:45 UTC | May 11, 01:00 UTC | 15m |
| 2026-05-10 | APZ151 | ICN → HNL | May 10, 13:55 UTC | May 10, 21:54 UTC | 8h 0m |
| 2026-05-10 | APZ802 | HKG → ICN | May 10, 06:00 UTC | May 10, 08:45 UTC | 2h 45m |
| 2026-05-10 | APZ801 | ICN → HKG | May 10, 00:45 UTC | May 10, 03:50 UTC | 3h 5m |
| 2026-05-08 | APZ112 | SFO → ICN | May 8, 22:55 UTC | May 9, 11:05 UTC | 12h 10m |
| 2026-05-08 | APZ111 | ICN → SFO | May 8, 09:19 UTC | May 8, 19:15 UTC | 9h 55m |
| 2026-05-06 | APZ802 | HKG → ICN | May 6, 05:50 UTC | May 6, 08:50 UTC | 3h 0m |
| 2026-05-06 | APZ801 | ICN → HKG | May 6, 03:20 UTC | May 6, 03:40 UTC | 20m |
| 2026-05-06 | APZ801 | ICN → HKG | May 6, 00:35 UTC | May 6, 02:40 UTC | 2h 5m |
| 2026-05-05 | APZ104 | LAX → ICN | May 5, 06:45 UTC | May 5, 18:50 UTC | 12h 5m |
| 2026-05-04 | APZ103 | ICN → LAX | May 4, 13:25 UTC | May 5, 00:05 UTC | 10h 41m |
| 2026-05-04 | APZ152 | HNL → ICN | May 4, 00:45 UTC | May 4, 10:15 UTC | 9h 30m |
| 2026-05-03 | APZ151 | ICN → HNL | May 3, 21:14 UTC | May 3, 21:35 UTC | 20m |
| 2026-05-03 | APZ151 | ICN → HNL | May 3, 13:50 UTC | May 3, 15:25 UTC | 1h 35m |
| 2026-05-03 | APZ802 | HKG → ICN | May 3, 05:45 UTC | May 3, 08:40 UTC | 2h 55m |
| 2026-05-03 | APZ801 | ICN → HKG | May 3, 03:35 UTC | May 3, 03:50 UTC | 15m |
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 HL8704 page for operator, model, and routing details .