sensors Mode-S transponder
A6DC17
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N541ER · operated by EMBRY-RIDDLE AERONAUTICAL UNIVERSITY INC
- Hex
- A6DC17
- Octal
- 51556027
- Decimal
- 10,935,319
- Country
- US
- Tail
- N541ER
- Type
- C172
- Flights observed
- 48
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 20d ago
Last known position
Country allocation
The ICAO 24-bit address A6DC17 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 1 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| ERU41 | - | 48 | 2026-07-25 |
Recent flights last 48
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-25 | ERU41 | - | Jul 25, 16:00 UTC | Jul 25, 17:20 UTC | 1h 20m |
| 2026-07-25 | ERU41 | - | Jul 25, 04:30 UTC | Jul 25, 06:10 UTC | 1h 40m |
| 2026-07-25 | ERU41 | - | Jul 25, 01:10 UTC | Jul 25, 02:55 UTC | 1h 45m |
| 2026-07-22 | ERU41 | - | Jul 22, 15:05 UTC | Jul 22, 16:00 UTC | 55m |
| 2026-07-21 | ERU41 | - | Jul 21, 16:30 UTC | Jul 21, 16:50 UTC | 20m |
| 2026-07-21 | ERU41 | - | Jul 21, 13:45 UTC | Jul 21, 14:50 UTC | 1h 5m |
| 2026-07-20 | ERU41 | - | Jul 20, 14:05 UTC | Jul 20, 14:45 UTC | 40m |
| 2026-07-19 | ERU41 | - | Jul 19, 15:15 UTC | Jul 19, 16:30 UTC | 1h 15m |
| 2026-07-11 | ERU41 | - | Jul 11, 20:35 UTC | Jul 11, 20:50 UTC | 15m |
| 2026-07-11 | ERU41 | - | Jul 11, 18:55 UTC | Jul 11, 19:30 UTC | 35m |
| 2026-07-10 | ERU41 | - | Jul 10, 20:00 UTC | Jul 10, 20:30 UTC | 30m |
| 2026-07-10 | ERU41 | - | Jul 10, 14:20 UTC | Jul 10, 15:20 UTC | 1h 0m |
| 2026-07-10 | ERU41 | - | Jul 10, 01:25 UTC | Jul 10, 02:05 UTC | 40m |
| 2026-07-08 | ERU41 | - | Jul 8, 02:00 UTC | Jul 8, 02:25 UTC | 25m |
| 2026-07-05 | ERU41 | - | Jul 5, 15:55 UTC | Jul 5, 16:50 UTC | 55m |
| 2026-07-01 | ERU41 | - | Jul 1, 15:30 UTC | Jul 1, 16:10 UTC | 40m |
| 2026-06-25 | ERU41 | - | Jun 25, 19:24 UTC | Jun 25, 19:39 UTC | 15m |
| 2026-06-25 | ERU41 | - | Jun 25, 16:55 UTC | Jun 25, 17:14 UTC | 20m |
| 2026-06-22 | ERU41 | - | Jun 22, 16:34 UTC | Jun 22, 16:50 UTC | 15m |
| 2026-06-22 | ERU41 | - | Jun 22, 16:14 UTC | Jun 22, 16:29 UTC | 15m |
| 2026-06-21 | ERU41 | - | Jun 21, 23:14 UTC | Jun 21, 23:30 UTC | 15m |
| 2026-06-21 | ERU41 | - | Jun 21, 21:49 UTC | Jun 21, 22:10 UTC | 20m |
| 2026-06-19 | ERU41 | - | Jun 19, 13:44 UTC | Jun 19, 15:14 UTC | 1h 30m |
| 2026-06-17 | ERU41 | - | Jun 17, 20:05 UTC | Jun 17, 20:15 UTC | 10m |
| 2026-06-05 | ERU41 | - | Jun 5, 14:05 UTC | Jun 5, 14:15 UTC | 10m |
| 2026-06-04 | ERU41 | - | Jun 4, 00:30 UTC | Jun 4, 01:05 UTC | 35m |
| 2026-05-31 | ERU41 | - | May 31, 19:00 UTC | May 31, 19:55 UTC | 55m |
| 2026-05-30 | ERU41 | - | May 30, 16:35 UTC | May 30, 16:55 UTC | 20m |
| 2026-05-22 | ERU41 | - | May 22, 18:10 UTC | May 22, 19:00 UTC | 50m |
| 2026-05-10 | ERU41 | - | May 10, 15:55 UTC | May 10, 16:44 UTC | 50m |
| 2026-05-07 | ERU41 | - | May 7, 19:45 UTC | May 7, 21:25 UTC | 1h 40m |
| 2026-05-07 | ERU41 | - | May 7, 15:20 UTC | May 7, 17:30 UTC | 2h 10m |
| 2026-05-06 | ERU41 | - | May 6, 23:35 UTC | May 6, 23:55 UTC | 20m |
| 2026-05-06 | ERU41 | - | May 6, 22:20 UTC | May 6, 22:40 UTC | 20m |
| 2026-05-06 | ERU41 | - | May 6, 16:55 UTC | May 6, 18:05 UTC | 1h 9m |
| 2026-05-06 | ERU41 | - | May 6, 14:30 UTC | May 6, 15:05 UTC | 35m |
| 2026-05-02 | ERU41 | - | May 2, 02:10 UTC | May 2, 03:00 UTC | 50m |
| 2026-05-01 | ERU41 | - | May 1, 21:15 UTC | May 1, 22:05 UTC | 50m |
| 2026-04-29 | ERU41 | - | Apr 29, 23:20 UTC | Apr 29, 23:40 UTC | 20m |
| 2026-04-25 | ERU41 | - | Apr 25, 15:25 UTC | Apr 25, 16:05 UTC | 40m |
| 2026-04-21 | ERU41 | - | Apr 21, 01:40 UTC | Apr 21, 02:40 UTC | 1h 0m |
| 2026-04-20 | ERU41 | - | Apr 20, 23:40 UTC | Apr 21, 01:05 UTC | 1h 25m |
| 2026-04-20 | ERU41 | - | Apr 20, 19:05 UTC | Apr 20, 19:20 UTC | 15m |
| 2026-04-20 | ERU41 | - | Apr 20, 17:55 UTC | Apr 20, 18:45 UTC | 50m |
| 2026-04-19 | ERU41 | - | Apr 19, 18:50 UTC | Apr 19, 20:05 UTC | 1h 15m |
| 2026-04-17 | ERU41 | - | Apr 17, 19:25 UTC | Apr 17, 19:40 UTC | 15m |
| 2026-04-17 | ERU41 | - | Apr 17, 18:45 UTC | Apr 17, 19:20 UTC | 35m |
| 2026-04-14 | ERU41 | - | Apr 14, 17:45 UTC | Apr 14, 18:05 UTC | 20m |
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 N541ER page for operator, model, and routing details .