sensors Mode-S transponder
ADFFFC
ICAO 24-bit transponder address
Currently assigned to 70-1585 · Northrop T-38C Talon
- Hex
- ADFFFC
- Octal
- 53377774
- Decimal
- 11,403,260
- Tail
- 70-1585
- Type
- T38
- Flights observed
- 11
- Distinct callsigns
- 10
- Country
- -
- Last broadcast
- Jul 22, 20:10 UTC
Last known position
Callsign history 10 distinct
Recent flights last 11
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-22 | SCAR12 | - | Jul 22, 19:35 UTC | Jul 22, 20:10 UTC | 35m |
| 2026-07-22 | SPEED22 | - | Jul 22, 16:20 UTC | Jul 22, 16:50 UTC | 30m |
| 2026-07-22 | SPEED42 | - | Jul 22, 13:10 UTC | Jul 22, 13:50 UTC | 40m |
| 2026-07-21 | BS11 | - | Jul 21, 19:30 UTC | Jul 21, 19:50 UTC | 20m |
| 2026-07-21 | GUTS22 | - | Jul 21, 12:25 UTC | Jul 21, 13:00 UTC | 35m |
| 2026-07-20 | SPD1 | - | Jul 20, 16:20 UTC | Jul 20, 16:30 UTC | 10m |
| 2026-07-20 | GUTS22 | - | Jul 20, 13:15 UTC | Jul 20, 13:50 UTC | 35m |
| 2026-05-04 | SPEED63 | - | May 4, 17:00 UTC | May 4, 17:30 UTC | 30m |
| 2026-04-15 | EAGLE67 | - | Apr 15, 20:00 UTC | Apr 15, 20:20 UTC | 20m |
| 2026-04-13 | GUTS31 | - | Apr 13, 19:55 UTC | Apr 13, 20:10 UTC | 15m |
| 2026-04-13 | BASS33 | - | Apr 13, 16:35 UTC | Apr 13, 17:00 UTC | 25m |
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 70-1585 page for operator, model, and routing details .