sensors Mode-S transponder
3D21E4
ICAO 24-bit transponder address · allocated to Germany
Currently assigned to D-ELBW · CIRRUS SR-22T Turbo
- Hex
- 3D21E4
- Octal
- 17220744
- Decimal
- 4,006,372
- Country
- DE
- Tail
- D-ELBW
- Type
- S22T
- Flights observed
- 24
- Distinct callsigns
- 1
- Country
- DE
- Last broadcast
- Jul 19, 10:25 UTC
Last known position
Country allocation
The ICAO 24-bit address 3D21E4 falls within the block assigned to Germany (DE) by ICAO Annex 10, Volume III. Every aircraft registered in Germany 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 |
|---|---|---|---|
| DELBW | - | 24 | 2026-07-19 |
Recent flights last 24
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-19 | DELBW | - | Jul 19, 09:20 UTC | Jul 19, 10:25 UTC | 1h 5m |
| 2026-07-18 | DELBW | - | Jul 18, 08:30 UTC | Jul 18, 09:55 UTC | 1h 25m |
| 2026-07-14 | DELBW | - | Jul 14, 14:10 UTC | Jul 14, 15:55 UTC | 1h 45m |
| 2026-07-13 | DELBW | - | Jul 13, 06:35 UTC | Jul 13, 07:50 UTC | 1h 15m |
| 2026-07-12 | DELBW | - | Jul 12, 12:10 UTC | Jul 12, 13:25 UTC | 1h 15m |
| 2026-07-10 | DELBW | - | Jul 10, 10:30 UTC | Jul 10, 12:35 UTC | 2h 5m |
| 2026-06-27 | DELBW | - | Jun 27, 11:04 UTC | Jun 27, 12:25 UTC | 1h 20m |
| 2026-06-22 | DELBW | - | Jun 22, 11:24 UTC | Jun 22, 12:40 UTC | 1h 15m |
| 2026-06-19 | DELBW | - | Jun 19, 11:24 UTC | Jun 19, 12:49 UTC | 1h 25m |
| 2026-06-17 | DELBW | - | Jun 17, 06:05 UTC | Jun 17, 06:25 UTC | 20m |
| 2026-06-16 | DELBW | - | Jun 16, 11:20 UTC | Jun 16, 13:19 UTC | 2h 0m |
| 2026-06-14 | DELBW | - | Jun 14, 11:15 UTC | Jun 14, 12:25 UTC | 1h 10m |
| 2026-06-06 | DELBW | - | Jun 6, 11:25 UTC | Jun 6, 12:40 UTC | 1h 15m |
| 2026-05-27 | DELBW | - | May 27, 08:00 UTC | May 27, 11:15 UTC | 3h 15m |
| 2026-05-24 | DELBW | - | May 24, 10:40 UTC | May 24, 12:35 UTC | 1h 55m |
| 2026-04-26 | DELBW | - | Apr 26, 14:55 UTC | Apr 26, 15:10 UTC | 15m |
| 2026-04-26 | DELBW | BRN → LEJ | Apr 26, 10:30 UTC | Apr 26, 13:55 UTC | 3h 25m |
| 2026-04-25 | DELBW | - | Apr 25, 14:00 UTC | Apr 25, 15:50 UTC | 1h 50m |
| 2026-04-24 | DELBW | - | Apr 24, 14:25 UTC | Apr 24, 16:20 UTC | 1h 55m |
| 2026-04-22 | DELBW | - | Apr 22, 08:35 UTC | Apr 22, 10:00 UTC | 1h 25m |
| 2026-04-15 | DELBW | - | Apr 15, 11:00 UTC | Apr 15, 11:45 UTC | 45m |
| 2026-04-15 | DELBW | - | Apr 15, 10:45 UTC | Apr 15, 10:55 UTC | 10m |
| 2026-04-15 | DELBW | - | Apr 15, 09:10 UTC | Apr 15, 10:10 UTC | 1h 0m |
| 2026-04-13 | DELBW | - | Apr 13, 08:55 UTC | Apr 13, 10:20 UTC | 1h 25m |
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 D-ELBW page for operator, model, and routing details .