sensors Mode-S transponder
A66935
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N512DN · AIRBUS A-350-900 · operated by DELTA AIR LINES INC
- Hex
- A66935
- Octal
- 51464465
- Decimal
- 10,905,909
- Country
- US
- Tail
- N512DN
- Type
- A359
- Flights observed
- 120
- Distinct callsigns
- 14
- Country
- US
- Last broadcast
- 1h ago
Last known position
Country allocation
The ICAO 24-bit address A66935 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States 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 14 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| DAL281 | Delta Air Lines | 20 | 2026-05-27 |
| DAL389 | Delta Air Lines | 15 | 2026-05-25 |
| DAL388 | Delta Air Lines | 14 | 2026-05-28 |
| DAL275 | Delta Air Lines | 13 | 2026-05-28 |
| DAL173 | Delta Air Lines | 11 | 2026-05-17 |
| DAL280 | Delta Air Lines | 9 | 2026-05-26 |
| DAL196 | Delta Air Lines | 7 | 2026-05-18 |
| DAL172 | Delta Air Lines | 7 | 2026-05-16 |
| DAL274 | Delta Air Lines | 6 | 2026-05-29 |
| DAL197 | Delta Air Lines | 6 | 2026-05-15 |
| DAL136 | Delta Air Lines | 4 | 2026-05-30 |
| DAL68 | Delta Air Lines | 3 | 2026-05-08 |
| DAL137 | Delta Air Lines | 3 | 2026-05-24 |
| DAL69 | Delta Air Lines | 2 | 2026-05-07 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | DAL136 | DTW → AMS | May 30, 02:45 UTC | May 30, 04:50 UTC | 2h 5m |
| 2026-05-29 | DAL274 | ATL → CDG | May 29, 09:55 UTC | May 29, 22:00 UTC | 12h 5m |
| 2026-05-28 | DAL275 | DTW → HND | May 28, 18:35 UTC | May 29, 07:25 UTC | 12h 50m |
| 2026-05-28 | DAL388 | SFO → JFK | May 28, 02:06 UTC | May 28, 15:01 UTC | 12h 55m |
| 2026-05-27 | DAL281 | SEA → PVG | May 27, 08:40 UTC | May 28, 04:20 UTC | 19h 40m |
| 2026-05-27 | DAL281 | SEA → PVG | May 27, 03:20 UTC | May 28, 03:15 UTC | 23h 55m |
| 2026-05-26 | DAL281 | SEA → PVG | May 26, 23:49 UTC | May 27, 10:10 UTC | 10h 21m |
| 2026-05-26 | DAL280 | SIN → ATL | May 26, 10:50 UTC | May 26, 12:14 UTC | 1h 25m |
| 2026-05-26 | DAL280 | SIN → ATL | May 26, 04:00 UTC | May 26, 20:09 UTC | 16h 10m |
| 2026-05-25 | DAL389 | JFK → DEN | May 25, 22:10 UTC | May 26, 20:09 UTC | 22h 0m |
| 2026-05-25 | DAL389 | JFK → DEN | May 25, 16:25 UTC | May 26, 05:34 UTC | 13h 10m |
| 2026-05-25 | DAL389 | JFK → DEN | May 25, 16:24 UTC | May 26, 06:40 UTC | 14h 16m |
| 2026-05-24 | DAL137 | AMS → DTW | May 24, 12:55 UTC | May 24, 20:40 UTC | 7h 45m |
| 2026-05-24 | DAL136 | DTW → AMS | May 24, 02:55 UTC | May 24, 09:50 UTC | 6h 55m |
| 2026-05-23 | DAL137 | AMS → DTW | May 23, 12:55 UTC | May 23, 20:50 UTC | 7h 55m |
| 2026-05-23 | DAL136 | DTW → AMS | May 23, 02:50 UTC | May 23, 09:35 UTC | 6h 45m |
| 2026-05-22 | DAL137 | AMS → DTW | May 22, 12:50 UTC | May 22, 20:20 UTC | 7h 30m |
| 2026-05-22 | DAL136 | DTW → AMS | May 22, 02:50 UTC | May 22, 09:30 UTC | 6h 40m |
| 2026-05-21 | DAL274 | ATL → CDG | May 21, 10:00 UTC | May 21, 21:05 UTC | 11h 5m |
| 2026-05-20 | DAL275 | DTW → HND | May 20, 18:20 UTC | May 21, 07:45 UTC | 13h 25m |
| 2026-05-20 | DAL275 | DTW → HND | May 20, 18:19 UTC | May 21, 07:51 UTC | 13h 32m |
| 2026-05-20 | DAL388 | SFO → JFK | May 20, 03:10 UTC | May 20, 14:40 UTC | 11h 31m |
| 2026-05-19 | DAL388 | SFO → JFK | May 19, 11:20 UTC | May 20, 11:15 UTC | 23h 56m |
| 2026-05-19 | DAL281 | SEA → PVG | May 19, 10:00 UTC | May 20, 04:25 UTC | 18h 25m |
| 2026-05-19 | DAL281 | SEA → PVG | May 19, 05:20 UTC | May 20, 04:25 UTC | 23h 5m |
| 2026-05-19 | DAL281 | SEA → PVG | May 19, 03:20 UTC | May 20, 03:15 UTC | 23h 55m |
| 2026-05-19 | DAL281 | SEA → PVG | May 19, 00:45 UTC | May 19, 11:25 UTC | 10h 40m |
| 2026-05-18 | DAL196 | ICN → SEA | May 18, 10:10 UTC | May 18, 19:50 UTC | 9h 39m |
| 2026-05-17 | DAL173 | MXP → JFK | May 17, 17:30 UTC | May 18, 05:20 UTC | 11h 50m |
| 2026-05-16 | DAL172 | MNL → JFK | May 16, 11:31 UTC | May 16, 13:15 UTC | 1h 45m |
| 2026-05-15 | DAL197 | SEA → ICN | May 15, 22:50 UTC | May 16, 09:21 UTC | 10h 31m |
| 2026-05-15 | DAL280 | SIN → ATL | May 15, 10:50 UTC | May 15, 20:15 UTC | 9h 24m |
| 2026-05-15 | DAL280 | SIN → ATL | May 15, 09:42 UTC | May 15, 20:12 UTC | 10h 30m |
| 2026-05-13 | DAL281 | SEA → PVG | May 13, 23:25 UTC | May 14, 03:35 UTC | 4h 10m |
| 2026-05-13 | DAL281 | SEA → PVG | May 13, 23:22 UTC | May 14, 10:21 UTC | 10h 59m |
| 2026-05-13 | DAL196 | ICN → SEA | May 13, 10:10 UTC | May 13, 12:00 UTC | 1h 50m |
| 2026-05-13 | DAL196 | ICN → SEA | May 13, 10:07 UTC | May 13, 19:44 UTC | 9h 37m |
| 2026-05-13 | DAL196 | ICN → SEA | May 13, 10:07 UTC | May 13, 19:42 UTC | 9h 35m |
| 2026-05-12 | DAL173 | MXP → JFK | May 12, 17:30 UTC | May 13, 05:15 UTC | 11h 45m |
| 2026-05-12 | DAL173 | MXP → JFK | May 12, 17:30 UTC | May 13, 05:05 UTC | 11h 35m |
| 2026-05-11 | DAL172 | MNL → JFK | May 11, 11:15 UTC | May 11, 21:40 UTC | 10h 26m |
| 2026-05-10 | DAL173 | MXP → JFK | May 10, 20:50 UTC | May 11, 02:15 UTC | 5h 25m |
| 2026-05-10 | DAL173 | MXP → JFK | May 10, 20:50 UTC | May 11, 08:55 UTC | 12h 5m |
| 2026-05-09 | DAL172 | MNL → JFK | May 9, 10:35 UTC | May 9, 20:49 UTC | 10h 15m |
| 2026-05-08 | DAL197 | SEA → ICN | May 8, 20:10 UTC | May 9, 07:15 UTC | 11h 5m |
| 2026-05-08 | DAL68 | TPE → SEA | May 8, 03:35 UTC | May 8, 04:39 UTC | 1h 5m |
| 2026-05-08 | DAL68 | TPE → SEA | May 8, 02:09 UTC | May 8, 02:24 UTC | 15m |
| 2026-05-08 | DAL68 | TPE → SEA | May 8, 02:08 UTC | May 8, 12:29 UTC | 10h 21m |
| 2026-05-07 | DAL69 | SEA → TPE | May 7, 11:25 UTC | May 7, 12:00 UTC | 35m |
| 2026-05-06 | DAL69 | SEA → TPE | May 6, 23:25 UTC | May 7, 10:00 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 N512DN page for operator, model, and routing details .