sensors Mode-S transponder
E4A5C1
ICAO 24-bit transponder address · allocated to Brazil
Currently assigned to PP-CTL · BELL 505 JetRanger X
- Hex
- E4A5C1
- Octal
- 71122701
- Decimal
- 14,984,641
- Country
- BR
- Tail
- PP-CTL
- Type
- B505
- Flights observed
- 13
- Distinct callsigns
- 1
- Country
- BR
- Last broadcast
- 21h ago
Last known position
Country allocation
The ICAO 24-bit address E4A5C1 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 |
|---|---|---|---|
| PSRZK | - | 13 | 2026-05-29 |
Recent flights last 13
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | PSRZK | BUD → VIE | May 29, 12:50 UTC | May 29, 13:20 UTC | 30m |
| 2026-05-28 | PSRZK | - | May 28, 23:40 UTC | May 29, 11:40 UTC | 12h 0m |
| 2026-05-28 | PSRZK | - | May 28, 21:40 UTC | May 28, 22:00 UTC | 20m |
| 2026-05-17 | PSRZK | - | May 17, 15:01 UTC | May 17, 15:45 UTC | 45m |
| 2026-05-17 | PSRZK | - | May 17, 12:30 UTC | May 17, 13:10 UTC | 40m |
| 2026-05-14 | PSRZK | - | May 14, 15:05 UTC | May 14, 15:15 UTC | 10m |
| 2026-05-14 | PSRZK | - | May 14, 10:05 UTC | May 14, 14:05 UTC | 4h 0m |
| 2026-05-14 | PSRZK | - | May 14, 00:35 UTC | May 14, 01:05 UTC | 30m |
| 2026-05-13 | PSRZK | - | May 13, 19:55 UTC | May 13, 20:10 UTC | 15m |
| 2026-05-11 | PSRZK | - | May 11, 10:50 UTC | May 11, 14:45 UTC | 3h 55m |
| 2026-05-11 | PSRZK | - | May 11, 09:05 UTC | May 11, 09:20 UTC | 15m |
| 2026-04-23 | PSRZK | - | Apr 23, 19:25 UTC | Apr 23, 19:55 UTC | 30m |
| 2026-04-22 | PSRZK | - | Apr 22, 20:50 UTC | Apr 23, 19:55 UTC | 23h 5m |
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 PP-CTL page for operator, model, and routing details .