sensors Mode-S transponder
3C4B21
ICAO 24-bit transponder address · allocated to Germany
Currently assigned to D-ABYA · BOEING 747-8
- Hex
- 3C4B21
- Octal
- 17045441
- Decimal
- 3,951,393
- Country
- DE
- Tail
- D-ABYA
- Type
- B748
- Flights observed
- 66
- Distinct callsigns
- 17
- Country
- DE
- Last broadcast
- 7h ago
Last known position
Country allocation
The ICAO 24-bit address 3C4B21 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 17 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| DLH463 | Lufthansa | 8 | 2026-05-25 |
| DLH431 | Lufthansa | 8 | 2026-05-24 |
| DLH430 | Lufthansa | 8 | 2026-05-24 |
| DLH506 | Lufthansa | 6 | 2026-05-30 |
| DLH462 | Lufthansa | 6 | 2026-05-25 |
| DLH507 | Lufthansa | 5 | 2026-05-31 |
| DLH499 | Lufthansa | 4 | 2026-06-02 |
| DLH498 | Lufthansa | 4 | 2026-06-01 |
| DLH573 | Lufthansa | 3 | 2026-05-16 |
| DLH457 | Lufthansa | 3 | 2026-05-29 |
| DLH456 | Lufthansa | 3 | 2026-05-29 |
| DLH754 | Lufthansa | 2 | 2026-05-19 |
| DLH572 | Lufthansa | 2 | 2026-05-15 |
| DLH7K | Lufthansa | 1 | 2026-04-22 |
| DLH755 | Lufthansa | 1 | 2026-05-19 |
| DLH572D | Lufthansa | 1 | 2026-04-18 |
| DLH423 | Lufthansa | 1 | 2026-04-22 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-02 | DLH499 | MEX → FRA | Jun 2, 02:15 UTC | Jun 2, 12:00 UTC | 9h 45m |
| 2026-06-01 | DLH498 | FRA → MEX | Jun 1, 12:10 UTC | Jun 1, 22:50 UTC | 10h 40m |
| 2026-05-31 | DLH507 | GRU → FRA | May 31, 21:45 UTC | Jun 1, 08:35 UTC | 10h 50m |
| 2026-05-30 | DLH506 | FRA → GRU | May 30, 20:50 UTC | May 31, 00:30 UTC | 3h 40m |
| 2026-05-29 | DLH457 | LAX → FRA | May 29, 22:25 UTC | May 30, 08:55 UTC | 10h 30m |
| 2026-05-29 | DLH456 | FRA → LAX | May 29, 09:35 UTC | May 29, 20:15 UTC | 10h 40m |
| 2026-05-28 | DLH499 | MEX → FRA | May 28, 02:50 UTC | May 28, 13:10 UTC | 10h 20m |
| 2026-05-27 | DLH498 | FRA → MEX | May 27, 12:25 UTC | May 27, 23:45 UTC | 11h 20m |
| 2026-05-26 | DLH457 | LAX → FRA | May 26, 23:05 UTC | May 27, 09:05 UTC | 10h 1m |
| 2026-05-26 | DLH456 | FRA → LAX | May 26, 09:40 UTC | May 26, 20:54 UTC | 11h 15m |
| 2026-05-25 | DLH463 | MIA → FRA | May 25, 21:24 UTC | May 26, 05:54 UTC | 8h 30m |
| 2026-05-25 | DLH462 | FRA → MIA | May 25, 09:10 UTC | May 25, 18:20 UTC | 9h 10m |
| 2026-05-24 | DLH431 | ORD → FRA | May 24, 23:00 UTC | May 25, 05:40 UTC | 6h 40m |
| 2026-05-24 | DLH430 | FRA → ORD | May 24, 09:55 UTC | May 24, 18:30 UTC | 8h 35m |
| 2026-05-23 | DLH463 | MIA → FRA | May 23, 21:45 UTC | May 24, 06:05 UTC | 8h 20m |
| 2026-05-23 | DLH462 | FRA → MIA | May 23, 09:50 UTC | May 23, 19:20 UTC | 9h 30m |
| 2026-05-21 | DLH431 | ORD → FRA | May 21, 21:55 UTC | May 22, 05:05 UTC | 7h 10m |
| 2026-05-21 | DLH430 | FRA → ORD | May 21, 09:25 UTC | May 21, 18:05 UTC | 8h 40m |
| 2026-05-19 | DLH755 | BLR → FRA | May 19, 23:55 UTC | May 20, 08:00 UTC | 8h 6m |
| 2026-05-19 | DLH754 | FRA → BLR | May 19, 20:40 UTC | May 19, 20:50 UTC | 10m |
| 2026-05-19 | DLH754 | FRA → BLR | May 19, 12:10 UTC | May 19, 19:15 UTC | 7h 5m |
| 2026-05-18 | DLH431 | ORD → FRA | May 18, 22:30 UTC | May 19, 05:55 UTC | 7h 25m |
| 2026-05-18 | DLH430 | FRA → ORD | May 18, 09:45 UTC | May 18, 18:40 UTC | 8h 54m |
| 2026-05-16 | DLH573 | JNB → FRA | May 16, 17:35 UTC | May 17, 03:40 UTC | 10h 5m |
| 2026-05-15 | DLH572 | FRA → JNB | May 15, 20:35 UTC | May 16, 06:31 UTC | 9h 56m |
| 2026-05-14 | DLH463 | MIA → FRA | May 14, 22:00 UTC | May 15, 06:10 UTC | 8h 10m |
| 2026-05-14 | DLH462 | FRA → MIA | May 14, 09:30 UTC | May 14, 19:20 UTC | 9h 50m |
| 2026-05-13 | DLH431 | ORD → FRA | May 13, 21:35 UTC | May 14, 05:25 UTC | 7h 50m |
| 2026-05-13 | DLH430 | FRA → ORD | May 13, 09:25 UTC | May 13, 18:00 UTC | 8h 35m |
| 2026-05-11 | DLH431 | ORD → FRA | May 11, 22:00 UTC | May 12, 05:25 UTC | 7h 25m |
| 2026-05-11 | DLH430 | FRA → ORD | May 11, 09:30 UTC | May 11, 18:25 UTC | 8h 55m |
| 2026-05-09 | DLH457 | LAX → FRA | May 9, 22:49 UTC | May 10, 09:15 UTC | 10h 25m |
| 2026-05-09 | DLH456 | FRA → LAX | May 9, 09:30 UTC | May 9, 20:25 UTC | 10h 55m |
| 2026-05-08 | DLH573 | JNB → FRA | May 8, 17:45 UTC | May 9, 03:50 UTC | 10h 5m |
| 2026-05-07 | DLH572 | FRA → JNB | May 7, 20:25 UTC | May 8, 06:20 UTC | 9h 55m |
| 2026-05-06 | DLH507 | GRU → FRA | May 6, 21:55 UTC | May 7, 08:35 UTC | 10h 40m |
| 2026-05-06 | DLH506 | FRA → GRU | May 6, 06:15 UTC | May 6, 07:55 UTC | 1h 40m |
| 2026-05-05 | DLH506 | FRA → GRU | May 5, 20:30 UTC | May 6, 05:55 UTC | 9h 24m |
| 2026-05-04 | DLH507 | GRU → FRA | May 4, 21:40 UTC | May 5, 08:00 UTC | 10h 20m |
| 2026-05-03 | DLH506 | FRA → GRU | May 3, 20:35 UTC | May 4, 08:25 UTC | 11h 50m |
| 2026-05-03 | DLH499 | MEX → FRA | May 3, 04:15 UTC | May 3, 14:15 UTC | 10h 0m |
| 2026-05-02 | DLH498 | FRA → MEX | May 2, 13:30 UTC | May 3, 01:05 UTC | 11h 35m |
| 2026-05-01 | DLH507 | GRU → FRA | May 1, 21:45 UTC | May 2, 08:20 UTC | 10h 36m |
| 2026-04-30 | DLH506 | FRA → GRU | Apr 30, 20:40 UTC | May 1, 08:00 UTC | 11h 20m |
| 2026-04-30 | DLH499 | MEX → FRA | Apr 30, 02:35 UTC | Apr 30, 13:05 UTC | 10h 30m |
| 2026-04-29 | DLH498 | FRA → MEX | Apr 29, 12:05 UTC | Apr 29, 23:25 UTC | 11h 19m |
| 2026-04-28 | DLH507 | GRU → FRA | Apr 28, 22:10 UTC | Apr 29, 08:50 UTC | 10h 40m |
| 2026-04-27 | DLH506 | FRA → GRU | Apr 27, 20:30 UTC | Apr 28, 07:50 UTC | 11h 20m |
| 2026-04-25 | DLH431 | ORD → FRA | Apr 25, 21:40 UTC | Apr 26, 05:35 UTC | 7h 55m |
| 2026-04-25 | DLH430 | FRA → ORD | Apr 25, 09:15 UTC | Apr 25, 17:15 UTC | 8h 0m |
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-ABYA page for operator, model, and routing details .