sensors Mode-S transponder
A7D72F
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N604MA · BOEING KC-135R/T Stratotanker · operated by WILMINGTON TRUST CO TRUSTEE
- Hex
- A7D72F
- Octal
- 51753457
- Decimal
- 10,999,599
- Country
- US
- Tail
- N604MA
- Type
- K35R
- Flights observed
- 43
- Distinct callsigns
- 5
- Country
- US
- Last broadcast
- Jul 18, 23:35 UTC
Last known position
Country allocation
The ICAO 24-bit address A7D72F 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 5 distinct
Recent flights last 43
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-18 | SWB91 | - | Jul 18, 23:00 UTC | Jul 18, 23:35 UTC | 35m |
| 2026-07-17 | SWB91 | - | Jul 17, 05:04 UTC | Jul 17, 05:39 UTC | 35m |
| 2026-07-15 | N6O4MA | - | Jul 15, 07:25 UTC | Jul 15, 13:55 UTC | 6h 30m |
| 2026-07-02 | ROBIN | - | Jul 2, 08:20 UTC | Jul 2, 08:50 UTC | 30m |
| 2026-06-29 | ROBIN | - | Jun 29, 03:54 UTC | Jun 29, 04:14 UTC | 20m |
| 2026-06-25 | ROBIN | - | Jun 25, 15:15 UTC | Jun 25, 18:10 UTC | 2h 55m |
| 2026-06-24 | ROBIN | - | Jun 24, 04:44 UTC | Jun 24, 07:15 UTC | 2h 30m |
| 2026-06-23 | ROBIN | - | Jun 23, 05:20 UTC | Jun 23, 07:49 UTC | 2h 30m |
| 2026-06-23 | ROBIN | - | Jun 23, 03:00 UTC | Jun 23, 04:05 UTC | 1h 5m |
| 2026-06-23 | ROBIN | - | Jun 23, 02:09 UTC | Jun 23, 02:29 UTC | 20m |
| 2026-06-22 | ROBIN | - | Jun 22, 03:05 UTC | Jun 22, 05:15 UTC | 2h 10m |
| 2026-06-19 | ROBIN | - | Jun 19, 08:04 UTC | Jun 19, 09:14 UTC | 1h 10m |
| 2026-06-19 | ROBIN | - | Jun 19, 07:04 UTC | Jun 19, 07:34 UTC | 30m |
| 2026-06-19 | ROBIN | - | Jun 19, 04:04 UTC | Jun 19, 04:25 UTC | 20m |
| 2026-06-18 | ROBIN | - | Jun 18, 07:45 UTC | Jun 18, 08:05 UTC | 20m |
| 2026-06-18 | ROBIN | - | Jun 18, 04:50 UTC | Jun 18, 06:25 UTC | 1h 35m |
| 2026-06-18 | ROBIN | - | Jun 18, 03:55 UTC | Jun 18, 04:15 UTC | 20m |
| 2026-06-15 | ROBIN | - | Jun 15, 04:20 UTC | Jun 15, 06:35 UTC | 2h 15m |
| 2026-06-12 | ROBIN | - | Jun 12, 03:50 UTC | Jun 12, 06:55 UTC | 3h 5m |
| 2026-06-11 | ROBIN | - | Jun 11, 02:55 UTC | Jun 11, 04:55 UTC | 2h 0m |
| 2026-06-10 | ROBIN | - | Jun 10, 04:20 UTC | Jun 10, 07:05 UTC | 2h 45m |
| 2026-06-09 | ROBIN | - | Jun 9, 04:35 UTC | Jun 9, 04:55 UTC | 20m |
| 2026-06-01 | HARPY | - | Jun 1, 04:20 UTC | Jun 1, 06:35 UTC | 2h 15m |
| 2026-05-27 | HARPY | - | May 27, 03:34 UTC | May 27, 06:25 UTC | 2h 50m |
| 2026-05-26 | HARPY | - | May 26, 06:25 UTC | May 26, 08:15 UTC | 1h 50m |
| 2026-05-26 | HARPY | - | May 26, 03:19 UTC | May 26, 03:35 UTC | 15m |
| 2026-05-25 | HARPY | - | May 25, 08:00 UTC | May 25, 08:25 UTC | 25m |
| 2026-05-25 | HARPY | - | May 25, 06:30 UTC | May 25, 07:10 UTC | 40m |
| 2026-05-25 | HARPY | - | May 25, 03:25 UTC | May 25, 03:45 UTC | 20m |
| 2026-05-22 | HARPY | - | May 22, 05:05 UTC | May 22, 08:15 UTC | 3h 10m |
| 2026-05-21 | HARPY | - | May 21, 05:25 UTC | May 21, 08:20 UTC | 2h 55m |
| 2026-05-19 | HARPY | - | May 19, 07:40 UTC | May 19, 08:45 UTC | 1h 5m |
| 2026-05-06 | HARPY | - | May 6, 04:10 UTC | May 6, 06:30 UTC | 2h 20m |
| 2026-04-27 | HARRIER | - | Apr 27, 04:00 UTC | Apr 27, 04:10 UTC | 10m |
| 2026-04-22 | HARRIER | - | Apr 22, 09:20 UTC | Apr 22, 09:45 UTC | 25m |
| 2026-04-22 | HARRIER | - | Apr 22, 05:01 UTC | Apr 22, 06:05 UTC | 1h 5m |
| 2026-04-22 | HARRIER | - | Apr 22, 04:10 UTC | Apr 22, 04:30 UTC | 20m |
| 2026-04-21 | HARRIER | - | Apr 21, 06:00 UTC | Apr 21, 07:35 UTC | 1h 35m |
| 2026-04-20 | HARRIER | - | Apr 20, 09:00 UTC | Apr 20, 09:10 UTC | 10m |
| 2026-04-20 | HARRIER | - | Apr 20, 04:55 UTC | Apr 20, 08:25 UTC | 3h 30m |
| 2026-04-17 | HARRIER | - | Apr 17, 08:40 UTC | Apr 17, 08:50 UTC | 10m |
| 2026-04-17 | HARRIER | - | Apr 17, 07:30 UTC | Apr 17, 08:05 UTC | 35m |
| 2026-04-17 | HARRIER | - | Apr 17, 05:45 UTC | Apr 17, 06:15 UTC | 30m |
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 N604MA page for operator, model, and routing details .