sensors Mode-S transponder
E4A173
ICAO 24-bit transponder address · allocated to Brazil
Currently assigned to PS-EER
- Hex
- E4A173
- Octal
- 71120563
- Decimal
- 14,983,539
- Country
- BR
- Tail
- PS-EER
- Type
- S22T
- Flights observed
- 21
- Distinct callsigns
- 1
- Country
- BR
- Last broadcast
- Jul 17, 15:20 UTC
Last known position
Country allocation
The ICAO 24-bit address E4A173 falls within the block assigned to Brazil (BR) by ICAO Annex 10, Volume III. Every aircraft registered in Brazil 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 |
|---|---|---|---|
| PSEER | - | 21 | 2026-07-17 |
Recent flights last 21
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-17 | PSEER | - | Jul 17, 15:10 UTC | Jul 17, 15:20 UTC | 10m |
| 2026-07-15 | PSEER | - | Jul 15, 12:35 UTC | Jul 15, 12:45 UTC | 10m |
| 2026-07-07 | PSEER | - | Jul 7, 12:25 UTC | Jul 7, 12:35 UTC | 10m |
| 2026-07-06 | PSEER | - | Jul 6, 12:30 UTC | Jul 6, 12:45 UTC | 15m |
| 2026-06-26 | PSEER | - | Jun 26, 10:25 UTC | Jun 26, 10:55 UTC | 30m |
| 2026-06-23 | PSEER | - | Jun 23, 18:55 UTC | Jun 23, 19:15 UTC | 20m |
| 2026-06-17 | PSEER | - | Jun 17, 20:40 UTC | Jun 17, 21:10 UTC | 30m |
| 2026-06-17 | PSEER | - | Jun 17, 14:05 UTC | Jun 17, 14:30 UTC | 25m |
| 2026-06-12 | PSEER | - | Jun 12, 15:50 UTC | Jun 12, 16:00 UTC | 10m |
| 2026-06-11 | PSEER | - | Jun 11, 09:45 UTC | Jun 11, 09:55 UTC | 10m |
| 2026-06-10 | PSEER | - | Jun 10, 21:10 UTC | Jun 10, 21:40 UTC | 30m |
| 2026-06-10 | PSEER | - | Jun 10, 12:35 UTC | Jun 10, 12:50 UTC | 15m |
| 2026-06-08 | PSEER | - | Jun 8, 12:15 UTC | Jun 8, 12:30 UTC | 15m |
| 2026-06-07 | PSEER | - | Jun 7, 12:00 UTC | Jun 7, 12:15 UTC | 15m |
| 2026-05-27 | PSEER | - | May 27, 17:05 UTC | May 27, 17:40 UTC | 35m |
| 2026-05-26 | PSEER | - | May 26, 13:34 UTC | May 26, 13:50 UTC | 15m |
| 2026-05-13 | PSEER | - | May 13, 12:45 UTC | May 13, 13:45 UTC | 1h 0m |
| 2026-05-12 | PSEER | - | May 12, 10:55 UTC | May 12, 11:40 UTC | 45m |
| 2026-05-07 | PSEER | - | May 7, 20:15 UTC | May 7, 20:35 UTC | 20m |
| 2026-05-07 | PSEER | - | May 7, 19:00 UTC | May 7, 19:30 UTC | 30m |
| 2026-05-05 | PSEER | - | May 5, 12:40 UTC | May 5, 13:00 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 PS-EER page for operator, model, and routing details .