sensors Mode-S transponder
A87876
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N645GT · BOEING 767-300 · operated by ATLAS AIR INC
- Hex
- A87876
- Octal
- 52074166
- Decimal
- 11,040,886
- Country
- US
- Tail
- N645GT
- Type
- B763
- Flights observed
- 66
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 7h ago
Last known position
Country allocation
The ICAO 24-bit address A87876 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 |
|---|---|---|---|
| CMB140 | - | 18 | 2026-05-29 |
| CMB564 | - | 7 | 2026-04-14 |
| GTI8714 | Atlas Air | 3 | 2026-05-24 |
| GTI8548 | Atlas Air | 3 | 2026-05-16 |
| GTI8547 | Atlas Air | 3 | 2026-05-15 |
| GTI8542 | Atlas Air | 3 | 2026-05-11 |
| GTI8541 | Atlas Air | 3 | 2026-05-10 |
| GTI8101 | Atlas Air | 3 | 2026-04-22 |
| GTI8087 | Atlas Air | 3 | 2026-04-15 |
| GTI8086 | Atlas Air | 3 | 2026-04-13 |
| CMB582 | - | 3 | 2026-04-21 |
| GTI8546 | Atlas Air | 2 | 2026-05-14 |
| GTI8543 | Atlas Air | 2 | 2026-05-12 |
| CMB378 | - | 2 | 2026-04-29 |
| GTI9858 | Atlas Air | 1 | 2026-04-20 |
| GTI9837 | Atlas Air | 1 | 2026-04-30 |
| GTI9712 | Atlas Air | 1 | 2026-05-15 |
| GTI8211 | Atlas Air | 1 | 2026-04-20 |
| GTI8120 | Atlas Air | 1 | 2026-04-19 |
| GTI8119 | Atlas Air | 1 | 2026-04-29 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | CMB140 | RMS → BWI | May 29, 10:55 UTC | May 29, 19:20 UTC | 8h 25m |
| 2026-05-28 | CMB140 | - | May 28, 21:40 UTC | May 29, 05:20 UTC | 7h 40m |
| 2026-05-24 | GTI8714 | NZY → HHN | May 24, 23:00 UTC | May 24, 23:46 UTC | 46m |
| 2026-05-24 | GTI8714 | NZY → HHN | May 24, 13:10 UTC | May 24, 15:55 UTC | 2h 45m |
| 2026-05-23 | GTI8714 | NZY → HHN | May 23, 08:05 UTC | May 23, 11:30 UTC | 3h 25m |
| 2026-05-22 | CMB140 | - | May 22, 10:10 UTC | May 22, 19:05 UTC | 8h 55m |
| 2026-05-21 | CMB140 | - | May 21, 21:50 UTC | May 22, 05:00 UTC | 7h 10m |
| 2026-05-16 | GTI8548 | KWI → HHN | May 16, 21:55 UTC | May 17, 02:15 UTC | 4h 20m |
| 2026-05-16 | GTI8548 | KWI → HHN | May 16, 14:11 UTC | May 16, 18:35 UTC | 4h 25m |
| 2026-05-16 | GTI8548 | KWI → HHN | May 16, 02:55 UTC | May 16, 11:21 UTC | 8h 26m |
| 2026-05-15 | GTI8547 | CVG → SUU | May 15, 21:10 UTC | May 15, 21:40 UTC | 30m |
| 2026-05-15 | GTI8547 | CVG → SUU | May 15, 12:55 UTC | May 15, 20:10 UTC | 7h 14m |
| 2026-05-15 | GTI8547 | CVG → SUU | May 15, 04:10 UTC | May 15, 09:15 UTC | 5h 5m |
| 2026-05-15 | GTI9712 | ORD → HIF | May 15, 01:05 UTC | May 15, 01:30 UTC | 25m |
| 2026-05-14 | GTI8546 | ANC → JFK | May 14, 02:15 UTC | May 14, 06:55 UTC | 4h 40m |
| 2026-05-13 | GTI8546 | ANC → JFK | May 13, 14:40 UTC | May 13, 23:00 UTC | 8h 20m |
| 2026-05-12 | GTI8543 | HKG → SYD | May 12, 22:45 UTC | May 13, 08:15 UTC | 9h 30m |
| 2026-05-12 | GTI8543 | HKG → SYD | May 12, 14:30 UTC | May 12, 19:15 UTC | 4h 45m |
| 2026-05-11 | GTI8542 | DFW → HHN | May 11, 15:05 UTC | May 11, 20:05 UTC | 5h 0m |
| 2026-05-11 | GTI8542 | DFW → HHN | May 11, 04:25 UTC | May 11, 11:30 UTC | 7h 5m |
| 2026-05-11 | GTI8542 | DFW → HHN | May 11, 03:05 UTC | May 11, 03:20 UTC | 15m |
| 2026-05-10 | GTI8541 | LCK → ANC | May 10, 12:05 UTC | May 10, 21:19 UTC | 9h 15m |
| 2026-05-10 | GTI8541 | LCK → ANC | May 10, 03:30 UTC | May 10, 08:30 UTC | 5h 0m |
| 2026-05-09 | GTI8541 | LCK → ANC | May 9, 16:55 UTC | May 9, 22:10 UTC | 5h 15m |
| 2026-05-08 | CMB140 | - | May 8, 20:00 UTC | May 8, 20:40 UTC | 40m |
| 2026-05-08 | CMB140 | - | May 8, 12:04 UTC | May 8, 19:55 UTC | 7h 50m |
| 2026-05-07 | CMB140 | - | May 7, 21:50 UTC | May 8, 05:09 UTC | 7h 19m |
| 2026-05-01 | CMB140 | - | May 1, 15:50 UTC | May 2, 00:10 UTC | 8h 20m |
| 2026-05-01 | CMB140 | - | May 1, 03:10 UTC | May 1, 11:30 UTC | 8h 20m |
| 2026-04-30 | GTI9837 | CVG → CVG | Apr 30, 04:25 UTC | Apr 30, 06:25 UTC | 2h 0m |
| 2026-04-29 | GTI8119 | RMS → BWI | Apr 29, 22:10 UTC | Apr 30, 01:10 UTC | 3h 0m |
| 2026-04-29 | CMB378 | - | Apr 29, 09:10 UTC | Apr 29, 19:20 UTC | 10h 10m |
| 2026-04-28 | CMB378 | - | Apr 28, 06:15 UTC | Apr 28, 16:25 UTC | 10h 10m |
| 2026-04-24 | CMB140 | - | Apr 24, 11:50 UTC | Apr 24, 19:30 UTC | 7h 40m |
| 2026-04-23 | CMB140 | - | Apr 23, 22:40 UTC | Apr 24, 06:45 UTC | 8h 5m |
| 2026-04-22 | GTI8101 | JFK → SDQ | Apr 22, 13:55 UTC | Apr 22, 16:00 UTC | 2h 5m |
| 2026-04-22 | GTI8101 | JFK → SDQ | Apr 22, 08:45 UTC | Apr 22, 11:40 UTC | 2h 55m |
| 2026-04-21 | GTI8101 | JFK → SDQ | Apr 21, 22:15 UTC | Apr 22, 05:35 UTC | 7h 20m |
| 2026-04-21 | CMB582 | - | Apr 21, 17:35 UTC | Apr 21, 18:10 UTC | 35m |
| 2026-04-21 | CMB582 | - | Apr 21, 12:05 UTC | Apr 21, 13:20 UTC | 1h 15m |
| 2026-04-21 | CMB582 | - | Apr 21, 01:00 UTC | Apr 21, 09:10 UTC | 8h 10m |
| 2026-04-20 | GTI8100 | - | Apr 20, 20:15 UTC | Apr 20, 20:55 UTC | 40m |
| 2026-04-20 | GTI9858 | ELP → BWI | Apr 20, 11:45 UTC | Apr 20, 15:00 UTC | 3h 15m |
| 2026-04-20 | GTI8211 | HKG → ICN | Apr 20, 04:05 UTC | Apr 20, 08:50 UTC | 4h 45m |
| 2026-04-19 | CMB524 | - | Apr 19, 17:45 UTC | Apr 20, 01:25 UTC | 7h 40m |
| 2026-04-19 | GTI8120 | HOP → HHN | Apr 19, 04:10 UTC | Apr 19, 12:00 UTC | 7h 50m |
| 2026-04-17 | CMB140 | - | Apr 17, 19:25 UTC | Apr 17, 21:05 UTC | 1h 40m |
| 2026-04-17 | CMB140 | - | Apr 17, 18:40 UTC | Apr 17, 19:20 UTC | 40m |
| 2026-04-17 | CMB140 | - | Apr 17, 13:20 UTC | Apr 17, 14:15 UTC | 55m |
| 2026-04-17 | CMB140 | - | Apr 17, 12:05 UTC | Apr 17, 13:15 UTC | 1h 10m |
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 N645GT page for operator, model, and routing details .