sensors Mode-S transponder
A8E39A
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N672ER · CESSNA 172 Skyhawk · operated by EMBRY-RIDDLE AERONAUTICAL UNIVERSITY INC
- Hex
- A8E39A
- Octal
- 52161632
- Decimal
- 11,068,314
- Country
- US
- Tail
- N672ER
- Type
- C172
- Flights observed
- 41
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 22d ago
Last known position
Country allocation
The ICAO 24-bit address A8E39A 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 |
|---|---|---|---|
| ERU72 | - | 41 | 2026-07-25 |
Recent flights last 41
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-25 | ERU72 | - | Jul 25, 14:15 UTC | Jul 25, 14:30 UTC | 15m |
| 2026-07-23 | ERU72 | - | Jul 23, 13:40 UTC | Jul 23, 13:55 UTC | 15m |
| 2026-07-22 | ERU72 | - | Jul 22, 15:05 UTC | Jul 22, 15:15 UTC | 10m |
| 2026-07-17 | ERU72 | - | Jul 17, 16:10 UTC | Jul 17, 16:29 UTC | 20m |
| 2026-07-13 | ERU72 | - | Jul 13, 18:55 UTC | Jul 13, 19:15 UTC | 20m |
| 2026-07-11 | ERU72 | - | Jul 11, 21:15 UTC | Jul 11, 22:25 UTC | 1h 10m |
| 2026-07-11 | ERU72 | - | Jul 11, 16:30 UTC | Jul 11, 17:25 UTC | 55m |
| 2026-07-11 | ERU72 | - | Jul 11, 02:20 UTC | Jul 11, 03:10 UTC | 50m |
| 2026-07-10 | ERU72 | - | Jul 10, 13:45 UTC | Jul 10, 14:45 UTC | 1h 0m |
| 2026-07-08 | ERU72 | - | Jul 8, 13:50 UTC | Jul 8, 14:50 UTC | 1h 0m |
| 2026-07-06 | ERU72 | - | Jul 6, 14:50 UTC | Jul 6, 15:10 UTC | 20m |
| 2026-06-30 | ERU72 | - | Jun 30, 15:10 UTC | Jun 30, 16:30 UTC | 1h 20m |
| 2026-06-30 | ERU72 | - | Jun 30, 03:40 UTC | Jun 30, 04:20 UTC | 40m |
| 2026-06-30 | ERU72 | - | Jun 30, 02:50 UTC | Jun 30, 03:25 UTC | 35m |
| 2026-06-29 | ERU72 | - | Jun 29, 01:05 UTC | Jun 29, 02:14 UTC | 1h 10m |
| 2026-06-21 | ERU72 | - | Jun 21, 15:09 UTC | Jun 21, 16:39 UTC | 1h 30m |
| 2026-06-10 | ERU72 | - | Jun 10, 22:00 UTC | Jun 10, 22:50 UTC | 50m |
| 2026-06-05 | ERU72 | - | Jun 5, 17:55 UTC | Jun 5, 19:40 UTC | 1h 45m |
| 2026-06-05 | ERU72 | - | Jun 5, 02:00 UTC | Jun 5, 02:25 UTC | 25m |
| 2026-06-04 | ERU72 | - | Jun 4, 14:05 UTC | Jun 4, 14:20 UTC | 15m |
| 2026-05-23 | ERU72 | - | May 23, 14:10 UTC | May 23, 15:10 UTC | 1h 0m |
| 2026-05-23 | ERU72 | - | May 23, 03:30 UTC | May 23, 03:55 UTC | 25m |
| 2026-05-22 | ERU72 | - | May 22, 17:15 UTC | May 22, 18:05 UTC | 50m |
| 2026-05-21 | ERU72 | - | May 21, 20:50 UTC | May 21, 21:30 UTC | 40m |
| 2026-05-21 | ERU72 | - | May 21, 02:55 UTC | May 21, 03:10 UTC | 15m |
| 2026-05-19 | ERU72 | - | May 19, 15:40 UTC | May 19, 16:25 UTC | 45m |
| 2026-05-17 | ERU72 | - | May 17, 15:10 UTC | May 17, 16:50 UTC | 1h 40m |
| 2026-05-15 | ERU72 | - | May 15, 14:50 UTC | May 15, 16:40 UTC | 1h 50m |
| 2026-05-13 | ERU72 | - | May 13, 14:20 UTC | May 13, 16:10 UTC | 1h 50m |
| 2026-05-09 | ERU72 | - | May 9, 04:50 UTC | May 9, 05:35 UTC | 45m |
| 2026-05-09 | ERU72 | - | May 9, 03:30 UTC | May 9, 04:45 UTC | 1h 15m |
| 2026-05-08 | ERU72 | - | May 8, 14:35 UTC | May 8, 14:50 UTC | 15m |
| 2026-05-01 | ERU72 | - | May 1, 17:00 UTC | May 1, 18:00 UTC | 1h 0m |
| 2026-04-24 | ERU72 | - | Apr 24, 01:30 UTC | Apr 24, 02:10 UTC | 40m |
| 2026-04-24 | ERU72 | - | Apr 24, 00:10 UTC | Apr 24, 01:05 UTC | 55m |
| 2026-04-23 | ERU72 | - | Apr 23, 03:05 UTC | Apr 23, 03:45 UTC | 40m |
| 2026-04-23 | ERU72 | - | Apr 23, 00:40 UTC | Apr 23, 01:15 UTC | 35m |
| 2026-04-21 | ERU72 | - | Apr 21, 15:15 UTC | Apr 21, 15:25 UTC | 10m |
| 2026-04-21 | ERU72 | - | Apr 21, 14:01 UTC | Apr 21, 14:45 UTC | 45m |
| 2026-04-18 | ERU72 | - | Apr 18, 18:05 UTC | Apr 18, 18:30 UTC | 25m |
| 2026-04-15 | ERU72 | - | Apr 15, 02:10 UTC | Apr 15, 02:20 UTC | 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 N672ER page for operator, model, and routing details .