sensors Mode-S transponder
A64924
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N504DN · AIRBUS A-350-900 · operated by DELTA AIR LINES INC, DEPT 595 AIRCRAFT REGISTRATIONS
- Hex
- A64924
- Octal
- 51444444
- Decimal
- 10,897,700
- Country
- US
- Tail
- N504DN
- Type
- A359
- Flights observed
- 123
- Distinct callsigns
- 18
- Country
- US
- Last broadcast
- 5h ago
Current position
Country allocation
The ICAO 24-bit address A64924 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 18 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| DAL281 | Delta Air Lines | 13 | 2026-05-26 |
| DAL166 | Delta Air Lines | 12 | 2026-04-28 |
| DAL173 | Delta Air Lines | 11 | 2026-05-13 |
| DAL68 | Delta Air Lines | 10 | 2026-05-24 |
| DAL196 | Delta Air Lines | 10 | 2026-05-25 |
| DAL388 | Delta Air Lines | 8 | 2026-05-27 |
| DAL167 | Delta Air Lines | 8 | 2026-04-27 |
| DAL69 | Delta Air Lines | 7 | 2026-05-22 |
| DAL389 | Delta Air Lines | 7 | 2026-05-21 |
| DAL275 | Delta Air Lines | 7 | 2026-05-29 |
| DAL274 | Delta Air Lines | 6 | 2026-05-28 |
| DAL197 | Delta Air Lines | 6 | 2026-05-24 |
| DAL172 | Delta Air Lines | 6 | 2026-05-12 |
| DAL280 | Delta Air Lines | 4 | 2026-05-22 |
| DAL137 | Delta Air Lines | 3 | 2026-05-20 |
| DAL136 | Delta Air Lines | 3 | 2026-05-20 |
| DAL8 | Delta Air Lines | 1 | 2026-04-12 |
| DAL2311 | - | 1 | 2026-04-13 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | DAL275 | DTW → HND | May 29, 18:25 UTC | May 29, 21:00 UTC | 2h 35m |
| 2026-05-29 | DAL275 | DTW → HND | May 29, 18:24 UTC | May 30, 06:59 UTC | 12h 35m |
| 2026-05-28 | DAL274 | ATL → CDG | May 28, 09:55 UTC | May 28, 22:00 UTC | 12h 5m |
| 2026-05-27 | DAL275 | DTW → HND | May 27, 18:20 UTC | May 28, 07:05 UTC | 12h 45m |
| 2026-05-27 | DAL388 | SFO → JFK | May 27, 03:09 UTC | May 27, 15:35 UTC | 12h 25m |
| 2026-05-26 | DAL388 | SFO → JFK | May 26, 09:04 UTC | May 27, 09:00 UTC | 23h 55m |
| 2026-05-26 | DAL281 | SEA → PVG | May 26, 08:15 UTC | May 27, 04:34 UTC | 20h 20m |
| 2026-05-25 | DAL281 | SEA → PVG | May 25, 23:19 UTC | May 26, 08:59 UTC | 9h 40m |
| 2026-05-25 | DAL281 | SEA → PVG | May 25, 23:16 UTC | May 26, 10:47 UTC | 11h 31m |
| 2026-05-25 | DAL196 | ICN → SEA | May 25, 10:15 UTC | May 25, 19:59 UTC | 9h 44m |
| 2026-05-25 | DAL196 | ICN → SEA | May 25, 10:14 UTC | May 25, 19:56 UTC | 9h 42m |
| 2026-05-24 | DAL197 | SEA → ICN | May 24, 20:15 UTC | May 25, 06:40 UTC | 10h 25m |
| 2026-05-24 | DAL197 | SEA → ICN | May 24, 20:14 UTC | May 25, 06:51 UTC | 10h 37m |
| 2026-05-24 | DAL68 | TPE → SEA | May 24, 03:40 UTC | May 24, 04:55 UTC | 1h 15m |
| 2026-05-24 | DAL68 | TPE → SEA | May 24, 02:10 UTC | May 24, 02:30 UTC | 20m |
| 2026-05-24 | DAL68 | TPE → SEA | May 24, 02:07 UTC | May 24, 12:14 UTC | 10h 7m |
| 2026-05-22 | DAL69 | SEA → TPE | May 22, 23:15 UTC | May 23, 11:10 UTC | 11h 54m |
| 2026-05-22 | DAL280 | SIN → ATL | May 22, 09:40 UTC | May 22, 19:26 UTC | 9h 46m |
| 2026-05-21 | DAL389 | JFK → DEN | May 21, 16:17 UTC | May 22, 06:29 UTC | 14h 12m |
| 2026-05-21 | DAL389 | JFK → DEN | May 21, 16:20 UTC | May 22, 12:05 UTC | 19h 45m |
| 2026-05-20 | DAL137 | AMS → DTW | May 20, 12:55 UTC | May 20, 21:15 UTC | 8h 20m |
| 2026-05-20 | DAL137 | AMS → DTW | May 20, 12:52 UTC | May 20, 21:12 UTC | 8h 20m |
| 2026-05-20 | DAL136 | DTW → AMS | May 20, 03:00 UTC | May 20, 05:00 UTC | 2h 1m |
| 2026-05-20 | DAL136 | DTW → AMS | May 20, 02:59 UTC | May 20, 09:48 UTC | 6h 49m |
| 2026-05-18 | DAL137 | AMS → DTW | May 18, 14:40 UTC | May 18, 22:40 UTC | 7h 59m |
| 2026-05-18 | DAL136 | DTW → AMS | May 18, 04:55 UTC | May 18, 11:50 UTC | 6h 55m |
| 2026-05-17 | DAL274 | ATL → CDG | May 17, 22:35 UTC | May 18, 02:20 UTC | 3h 45m |
| 2026-05-17 | DAL274 | ATL → CDG | May 17, 11:10 UTC | May 17, 19:30 UTC | 8h 20m |
| 2026-05-16 | DAL275 | DTW → HND | May 16, 19:25 UTC | May 17, 08:20 UTC | 12h 55m |
| 2026-05-16 | DAL388 | SFO → JFK | May 16, 03:35 UTC | May 16, 15:31 UTC | 11h 56m |
| 2026-05-15 | DAL388 | SFO → JFK | May 15, 09:05 UTC | May 16, 04:55 UTC | 19h 49m |
| 2026-05-15 | DAL281 | SEA → PVG | May 15, 08:00 UTC | May 16, 04:55 UTC | 20h 54m |
| 2026-05-14 | DAL281 | SEA → PVG | May 14, 23:40 UTC | May 15, 09:20 UTC | 9h 40m |
| 2026-05-14 | DAL281 | SEA → PVG | May 14, 23:40 UTC | May 15, 10:18 UTC | 10h 38m |
| 2026-05-14 | DAL196 | ICN → SEA | May 14, 10:10 UTC | May 14, 19:55 UTC | 9h 45m |
| 2026-05-14 | DAL196 | ICN → SEA | May 14, 10:10 UTC | May 14, 19:48 UTC | 9h 38m |
| 2026-05-13 | DAL173 | MXP → JFK | May 13, 17:41 UTC | May 14, 05:19 UTC | 11h 38m |
| 2026-05-13 | DAL173 | MXP → JFK | May 13, 17:40 UTC | May 13, 22:55 UTC | 5h 15m |
| 2026-05-12 | DAL172 | MNL → JFK | May 12, 10:40 UTC | May 12, 21:25 UTC | 10h 45m |
| 2026-05-12 | DAL172 | MNL → JFK | May 12, 10:35 UTC | May 12, 21:20 UTC | 10h 45m |
| 2026-05-11 | DAL173 | MXP → JFK | May 11, 17:30 UTC | May 11, 22:35 UTC | 5h 4m |
| 2026-05-11 | DAL173 | MXP → JFK | May 11, 17:30 UTC | May 12, 05:28 UTC | 11h 58m |
| 2026-05-10 | DAL172 | MNL → JFK | May 10, 10:30 UTC | May 10, 21:04 UTC | 10h 35m |
| 2026-05-09 | DAL197 | SEA → ICN | May 9, 20:10 UTC | May 10, 06:59 UTC | 10h 50m |
| 2026-05-09 | DAL68 | TPE → SEA | May 9, 03:45 UTC | May 9, 12:20 UTC | 8h 35m |
| 2026-05-09 | DAL68 | TPE → SEA | May 9, 02:25 UTC | May 9, 02:35 UTC | 10m |
| 2026-05-07 | DAL69 | SEA → TPE | May 7, 23:14 UTC | May 8, 03:14 UTC | 4h 0m |
| 2026-05-07 | DAL69 | SEA → TPE | May 7, 23:15 UTC | May 8, 11:51 UTC | 12h 36m |
| 2026-05-07 | DAL196 | ICN → SEA | May 7, 10:15 UTC | May 7, 19:00 UTC | 8h 45m |
| 2026-05-07 | DAL196 | ICN → SEA | May 7, 10:13 UTC | May 7, 19:47 UTC | 9h 34m |
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 N504DN page for operator, model, and routing details .