sensors Mode-S transponder
A57719
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N451PA · BOEING 747-400 · operated by ATLAS AIR INC
- Hex
- A57719
- Octal
- 51273431
- Decimal
- 10,843,929
- Country
- US
- Tail
- N451PA
- Type
- B744
- Flights observed
- 172
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- Jul 26, 16:10 UTC
Last known position
Country allocation
The ICAO 24-bit address A57719 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 20 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| GTI8153 | - | 9 | 2026-07-14 |
| GTI654 | Atlas Air | 9 | 2026-05-04 |
| GTI825 | Atlas Air | 8 | 2026-04-16 |
| GTI8373 | Atlas Air | 7 | 2026-07-19 |
| GTI8193 | Atlas Air | 7 | 2026-07-22 |
| GTI8158 | - | 7 | 2026-07-15 |
| GTI8998 | Atlas Air | 5 | 2026-05-08 |
| GTI8298 | Atlas Air | 5 | 2026-07-21 |
| GTI812 | Atlas Air | 5 | 2026-07-24 |
| GTI8997 | Atlas Air | 4 | 2026-05-07 |
| GTI8712 | - | 4 | 2026-07-17 |
| GTI8418 | Atlas Air | 4 | 2026-04-18 |
| GTI8192 | Atlas Air | 4 | 2026-07-22 |
| GTI8139 | - | 4 | 2026-07-12 |
| GTI8137 | - | 4 | 2026-07-18 |
| GTI9476 | Atlas Air | 3 | 2026-06-05 |
| GTI8692 | Atlas Air | 3 | 2026-04-28 |
| GTI8603 | Atlas Air | 3 | 2026-07-26 |
| GTI8502 | Atlas Air | 3 | 2026-04-25 |
| GTI8422 | Atlas Air | 3 | 2026-05-29 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | GTI8603 | MIA → MST | Jul 26, 09:50 UTC | Jul 26, 16:05 UTC | 6h 15m |
| 2026-07-25 | GTI8603 | MIA → MST | Jul 25, 16:15 UTC | Jul 26, 07:55 UTC | 15h 41m |
| 2026-07-25 | GTI8603 | MIA → MST | Jul 25, 10:20 UTC | Jul 26, 07:55 UTC | 21h 36m |
| 2026-07-25 | GTI8602 | ORD → ICN | Jul 25, 09:55 UTC | Jul 26, 07:55 UTC | 22h 1m |
| 2026-07-25 | GTI8602 | ORD → ICN | Jul 25, 00:35 UTC | Jul 25, 07:25 UTC | 6h 50m |
| 2026-07-24 | GTI812 | PVG → ANC | Jul 24, 08:05 UTC | Jul 24, 14:05 UTC | 6h 0m |
| 2026-07-23 | GTI812 | PVG → ANC | Jul 23, 16:30 UTC | Jul 24, 05:50 UTC | 13h 20m |
| 2026-07-22 | GTI8193 | YYZ → DFW | Jul 22, 19:50 UTC | Jul 22, 21:55 UTC | 2h 5m |
| 2026-07-22 | GTI8192 | DFW → HKG | Jul 22, 12:15 UTC | Jul 22, 12:55 UTC | 40m |
| 2026-07-21 | GTI8298 | NGU → HHN | Jul 21, 22:50 UTC | Jul 21, 23:15 UTC | 25m |
| 2026-07-21 | GTI8298 | NGU → HHN | Jul 21, 14:20 UTC | Jul 21, 22:05 UTC | 7h 45m |
| 2026-07-21 | GTI8298 | NGU → HHN | Jul 21, 05:10 UTC | Jul 21, 09:05 UTC | 3h 55m |
| 2026-07-20 | GTI8298 | - | Jul 20, 14:15 UTC | Jul 20, 23:35 UTC | 9h 20m |
| 2026-07-20 | GTI8298 | - | Jul 20, 09:35 UTC | Jul 20, 11:50 UTC | 2h 15m |
| 2026-07-19 | GTI8373 | HKG → ANC | Jul 19, 22:45 UTC | Jul 20, 05:50 UTC | 7h 5m |
| 2026-07-19 | GTI8373 | HKG → ANC | Jul 19, 10:20 UTC | Jul 19, 19:50 UTC | 9h 30m |
| 2026-07-19 | GTI8373 | HKG → ANC | Jul 19, 06:40 UTC | Jul 19, 07:10 UTC | 30m |
| 2026-07-18 | GTI8138 | DEL → HAN | Jul 18, 22:50 UTC | Jul 19, 06:00 UTC | 7h 10m |
| 2026-07-18 | GTI8137 | - | Jul 18, 17:40 UTC | Jul 18, 20:10 UTC | 2h 30m |
| 2026-07-18 | GTI8137 | - | Jul 18, 15:30 UTC | Jul 18, 15:45 UTC | 15m |
| 2026-07-17 | GTI8712 | - | Jul 17, 12:35 UTC | Jul 17, 13:00 UTC | 25m |
| 2026-07-17 | GTI8712 | - | Jul 17, 09:20 UTC | Jul 17, 09:45 UTC | 25m |
| 2026-07-16 | GTI8712 | - | Jul 16, 02:15 UTC | Jul 16, 08:45 UTC | 6h 30m |
| 2026-07-15 | GTI8712 | ICN → OKO | Jul 15, 19:20 UTC | Jul 15, 21:15 UTC | 1h 55m |
| 2026-07-15 | GTI8158 | - | Jul 15, 05:50 UTC | Jul 15, 16:50 UTC | 11h 0m |
| 2026-07-14 | GTI8153 | - | Jul 14, 08:00 UTC | Jul 14, 12:45 UTC | 4h 45m |
| 2026-07-13 | GTI8153 | ICN → AMS | Jul 13, 15:25 UTC | Jul 14, 12:45 UTC | 21h 20m |
| 2026-07-13 | GTI8140 | - | Jul 13, 02:50 UTC | Jul 13, 03:10 UTC | 20m |
| 2026-07-12 | GTI8140 | - | Jul 12, 20:05 UTC | Jul 12, 22:55 UTC | 2h 50m |
| 2026-07-12 | GTI8139 | - | Jul 12, 15:01 UTC | Jul 12, 17:30 UTC | 2h 30m |
| 2026-07-12 | GTI8139 | - | Jul 12, 12:50 UTC | Jul 12, 13:05 UTC | 15m |
| 2026-07-03 | GTI8292 | - | Jul 3, 23:10 UTC | Jul 4, 07:30 UTC | 8h 20m |
| 2026-07-03 | GTI8292 | - | Jul 3, 14:30 UTC | Jul 3, 18:20 UTC | 3h 50m |
| 2026-07-03 | GTI8292 | - | Jul 3, 02:55 UTC | Jul 3, 11:45 UTC | 8h 50m |
| 2026-07-02 | GTI8825 | - | Jul 2, 21:10 UTC | Jul 3, 00:00 UTC | 2h 50m |
| 2026-07-02 | CMB135 | - | Jul 2, 09:55 UTC | Jul 2, 18:15 UTC | 8h 20m |
| 2026-07-01 | CMB135 | - | Jul 1, 21:05 UTC | Jul 2, 04:05 UTC | 7h 0m |
| 2026-07-01 | GTI8824 | BWI → HHN | Jul 1, 15:50 UTC | Jul 1, 17:25 UTC | 1h 35m |
| 2026-07-01 | GTI518 | ANC → ORD | Jul 1, 07:25 UTC | Jul 1, 12:55 UTC | 5h 30m |
| 2026-06-30 | GTI518 | - | Jun 30, 22:10 UTC | Jul 1, 05:15 UTC | 7h 5m |
| 2026-06-29 | GTI517 | - | Jun 29, 07:40 UTC | Jun 29, 20:59 UTC | 13h 20m |
| 2026-06-28 | GTI8193 | - | Jun 28, 22:45 UTC | Jun 29, 04:04 UTC | 5h 20m |
| 2026-06-28 | GTI8193 | ICN → ANC | Jun 28, 12:44 UTC | Jun 28, 20:04 UTC | 7h 20m |
| 2026-06-27 | GTI8193 | - | Jun 27, 14:39 UTC | Jun 27, 16:39 UTC | 2h 0m |
| 2026-06-27 | GTI8192 | - | Jun 27, 08:20 UTC | Jun 27, 09:04 UTC | 45m |
| 2026-06-26 | GTI8192 | - | Jun 26, 15:15 UTC | Jun 27, 05:25 UTC | 14h 10m |
| 2026-06-26 | GTI8193 | ANC → ORD | Jun 26, 07:05 UTC | Jun 26, 12:24 UTC | 5h 20m |
| 2026-06-25 | GTI8193 | ICN → ANC | Jun 25, 21:20 UTC | Jun 26, 04:59 UTC | 7h 40m |
| 2026-06-25 | GTI8193 | - | Jun 25, 18:59 UTC | Jun 25, 19:29 UTC | 30m |
| 2026-06-25 | GTI8192 | - | Jun 25, 09:34 UTC | Jun 25, 10:20 UTC | 45m |
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 N451PA page for operator, model, and routing details .