sensors Mode-S transponder
A6659A
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N511ER · CESSNA 172 Skyhawk · operated by EMBRY-RIDDLE AERONAUTICAL UNIVERSITY INC
- Hex
- A6659A
- Octal
- 51462632
- Decimal
- 10,904,986
- Country
- US
- Tail
- N511ER
- Type
- C172
- Flights observed
- 57
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 19d ago
Last known position
Country allocation
The ICAO 24-bit address A6659A 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 |
|---|---|---|---|
| ERU11 | - | 57 | 2026-07-26 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | ERU11 | - | Jul 26, 15:45 UTC | Jul 26, 16:05 UTC | 20m |
| 2026-07-24 | ERU11 | - | Jul 24, 16:55 UTC | Jul 24, 17:10 UTC | 15m |
| 2026-07-21 | ERU11 | - | Jul 21, 14:35 UTC | Jul 21, 15:00 UTC | 25m |
| 2026-07-21 | ERU11 | - | Jul 21, 05:00 UTC | Jul 21, 05:15 UTC | 15m |
| 2026-07-17 | ERU11 | - | Jul 17, 17:15 UTC | Jul 17, 17:35 UTC | 20m |
| 2026-07-15 | ERU11 | - | Jul 15, 18:20 UTC | Jul 15, 18:30 UTC | 10m |
| 2026-07-14 | ERU11 | - | Jul 14, 17:00 UTC | Jul 14, 17:50 UTC | 50m |
| 2026-07-14 | ERU11 | - | Jul 14, 13:25 UTC | Jul 14, 15:00 UTC | 1h 35m |
| 2026-07-09 | ERU11 | - | Jul 9, 14:20 UTC | Jul 9, 14:30 UTC | 10m |
| 2026-07-03 | ERU11 | - | Jul 3, 16:45 UTC | Jul 3, 17:05 UTC | 20m |
| 2026-07-03 | ERU11 | - | Jul 3, 13:50 UTC | Jul 3, 15:05 UTC | 1h 15m |
| 2026-07-02 | ERU11 | - | Jul 2, 16:40 UTC | Jul 2, 17:00 UTC | 20m |
| 2026-06-28 | ERU11 | - | Jun 28, 13:29 UTC | Jun 28, 13:59 UTC | 30m |
| 2026-06-25 | ERU11 | - | Jun 25, 18:50 UTC | Jun 25, 19:49 UTC | 1h 0m |
| 2026-06-23 | ERU11 | - | Jun 23, 14:35 UTC | Jun 23, 15:30 UTC | 55m |
| 2026-06-22 | ERU11 | - | Jun 22, 16:05 UTC | Jun 22, 16:14 UTC | 10m |
| 2026-06-19 | ERU11 | - | Jun 19, 02:39 UTC | Jun 19, 03:09 UTC | 30m |
| 2026-06-12 | ERU11 | - | Jun 12, 15:30 UTC | Jun 12, 16:15 UTC | 45m |
| 2026-06-12 | ERU11 | - | Jun 12, 03:25 UTC | Jun 12, 03:55 UTC | 30m |
| 2026-06-10 | ERU11 | - | Jun 10, 16:55 UTC | Jun 10, 17:30 UTC | 35m |
| 2026-06-10 | ERU11 | - | Jun 10, 03:25 UTC | Jun 10, 03:35 UTC | 10m |
| 2026-06-05 | ERU11 | - | Jun 5, 15:35 UTC | Jun 5, 16:35 UTC | 1h 0m |
| 2026-06-03 | ERU11 | - | Jun 3, 14:35 UTC | Jun 3, 16:00 UTC | 1h 25m |
| 2026-06-02 | ERU11 | - | Jun 2, 13:40 UTC | Jun 2, 14:35 UTC | 55m |
| 2026-06-01 | ERU11 | - | Jun 1, 16:40 UTC | Jun 1, 16:55 UTC | 15m |
| 2026-06-01 | ERU11 | - | Jun 1, 14:05 UTC | Jun 1, 14:15 UTC | 10m |
| 2026-05-30 | ERU11 | - | May 30, 23:40 UTC | May 31, 01:11 UTC | 1h 31m |
| 2026-05-30 | ERU11 | - | May 30, 16:50 UTC | May 30, 19:05 UTC | 2h 15m |
| 2026-05-28 | ERU11 | - | May 28, 14:15 UTC | May 28, 14:30 UTC | 15m |
| 2026-05-25 | ERU11 | - | May 25, 03:35 UTC | May 25, 05:20 UTC | 1h 45m |
| 2026-05-21 | ERU11 | - | May 21, 20:10 UTC | May 21, 20:20 UTC | 10m |
| 2026-05-21 | ERU11 | - | May 21, 16:30 UTC | May 21, 17:00 UTC | 30m |
| 2026-05-21 | ERU11 | - | May 21, 14:20 UTC | May 21, 14:30 UTC | 10m |
| 2026-05-20 | ERU11 | - | May 20, 20:40 UTC | May 20, 20:55 UTC | 15m |
| 2026-05-15 | ERU11 | - | May 15, 22:25 UTC | May 15, 22:45 UTC | 20m |
| 2026-05-15 | ERU11 | - | May 15, 16:20 UTC | May 15, 16:35 UTC | 15m |
| 2026-05-15 | ERU11 | - | May 15, 14:30 UTC | May 15, 15:20 UTC | 49m |
| 2026-05-14 | ERU11 | - | May 14, 04:00 UTC | May 14, 05:30 UTC | 1h 30m |
| 2026-05-13 | ERU11 | - | May 13, 23:30 UTC | May 14, 01:00 UTC | 1h 30m |
| 2026-05-12 | ERU11 | - | May 12, 22:05 UTC | May 12, 22:31 UTC | 25m |
| 2026-05-12 | ERU11 | - | May 12, 19:10 UTC | May 12, 19:55 UTC | 45m |
| 2026-05-11 | ERU11 | - | May 11, 03:45 UTC | May 11, 04:35 UTC | 50m |
| 2026-05-10 | ERU11 | - | May 10, 21:44 UTC | May 11, 00:25 UTC | 2h 40m |
| 2026-05-10 | ERU11 | - | May 10, 18:05 UTC | May 10, 19:05 UTC | 1h 0m |
| 2026-05-10 | ERU11 | - | May 10, 16:34 UTC | May 10, 17:30 UTC | 55m |
| 2026-05-08 | ERU11 | - | May 8, 00:25 UTC | May 8, 01:00 UTC | 35m |
| 2026-05-02 | ERU11 | - | May 2, 04:35 UTC | May 2, 05:15 UTC | 40m |
| 2026-05-02 | ERU11 | - | May 2, 03:55 UTC | May 2, 04:30 UTC | 35m |
| 2026-04-30 | ERU11 | - | Apr 30, 20:20 UTC | Apr 30, 20:40 UTC | 20m |
| 2026-04-30 | ERU11 | - | Apr 30, 19:00 UTC | Apr 30, 19:30 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 N511ER page for operator, model, and routing details .