sensors Mode-S transponder
45B424
ICAO 24-bit transponder address · allocated to Denmark
Currently assigned to OY-MAD · BOEING 777-200LR
- Hex
- 45B424
- Octal
- 21332044
- Decimal
- 4,568,100
- Country
- DK
- Tail
- OY-MAD
- Type
- B77L
- Flights observed
- 166
- Distinct callsigns
- 4
- Country
- DK
- Last broadcast
- 2h ago
Current position
Country allocation
The ICAO 24-bit address 45B424 falls within the block assigned to Denmark (DK) by ICAO Annex 10, Volume III. Every aircraft registered in Denmark 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 4 distinct
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-14 | SRR902 | - | Jul 14, 07:15 UTC | Jul 14, 12:30 UTC | 5h 15m |
| 2026-07-13 | SRR902 | - | Jul 13, 09:40 UTC | Jul 14, 08:25 UTC | 22h 45m |
| 2026-07-13 | SRR901 | - | Jul 13, 06:25 UTC | Jul 13, 10:20 UTC | 3h 55m |
| 2026-07-12 | SRR902 | - | Jul 12, 15:05 UTC | Jul 12, 16:20 UTC | 1h 15m |
| 2026-07-12 | SRR902 | - | Jul 12, 07:10 UTC | Jul 12, 12:25 UTC | 5h 15m |
| 2026-07-11 | SRR902 | - | Jul 11, 09:40 UTC | Jul 12, 08:30 UTC | 22h 50m |
| 2026-07-11 | SRR901 | - | Jul 11, 06:25 UTC | Jul 11, 10:00 UTC | 3h 35m |
| 2026-07-10 | SRR902 | - | Jul 10, 15:05 UTC | Jul 10, 16:20 UTC | 1h 15m |
| 2026-07-10 | SRR902 | - | Jul 10, 07:45 UTC | Jul 10, 13:15 UTC | 5h 30m |
| 2026-07-09 | SRR902 | - | Jul 9, 09:25 UTC | Jul 10, 09:00 UTC | 23h 35m |
| 2026-07-09 | SRR901 | - | Jul 9, 06:30 UTC | Jul 9, 10:15 UTC | 3h 45m |
| 2026-07-08 | SRR902 | - | Jul 8, 15:05 UTC | Jul 8, 16:15 UTC | 1h 10m |
| 2026-07-08 | SRR902 | - | Jul 8, 07:30 UTC | Jul 8, 12:45 UTC | 5h 15m |
| 2026-07-07 | SRR902 | - | Jul 7, 09:45 UTC | Jul 8, 08:45 UTC | 23h 0m |
| 2026-07-07 | SRR901 | - | Jul 7, 06:25 UTC | Jul 7, 10:15 UTC | 3h 50m |
| 2026-07-06 | SRR902 | - | Jul 6, 15:10 UTC | Jul 6, 16:20 UTC | 1h 10m |
| 2026-07-06 | SRR902 | - | Jul 6, 12:25 UTC | Jul 6, 12:50 UTC | 25m |
| 2026-07-06 | SRR902 | - | Jul 6, 07:25 UTC | Jul 6, 08:35 UTC | 1h 10m |
| 2026-07-05 | SRR902 | - | Jul 5, 09:35 UTC | Jul 6, 08:35 UTC | 23h 0m |
| 2026-07-05 | SRR901 | - | Jul 5, 06:20 UTC | Jul 5, 10:05 UTC | 3h 45m |
| 2026-07-04 | SRR904 | - | Jul 4, 19:40 UTC | Jul 4, 20:50 UTC | 1h 10m |
| 2026-07-04 | SRR904 | - | Jul 4, 12:30 UTC | Jul 4, 17:50 UTC | 5h 20m |
| 2026-07-03 | SRR903 | - | Jul 3, 13:05 UTC | Jul 4, 13:00 UTC | 23h 55m |
| 2026-07-03 | SRR903 | - | Jul 3, 11:05 UTC | Jul 3, 14:55 UTC | 3h 50m |
| 2026-07-02 | SRR902 | - | Jul 2, 15:05 UTC | Jul 2, 16:10 UTC | 1h 5m |
| 2026-07-02 | SRR902 | - | Jul 2, 07:15 UTC | Jul 2, 12:30 UTC | 5h 15m |
| 2026-07-01 | SRR902 | - | Jul 1, 09:40 UTC | Jul 2, 08:30 UTC | 22h 50m |
| 2026-07-01 | SRR901 | - | Jul 1, 06:20 UTC | Jul 1, 10:25 UTC | 4h 5m |
| 2026-06-30 | SRR902 | - | Jun 30, 15:05 UTC | Jun 30, 16:15 UTC | 1h 10m |
| 2026-06-30 | SRR902 | - | Jun 30, 07:35 UTC | Jun 30, 12:40 UTC | 5h 5m |
| 2026-06-29 | SRR902 | - | Jun 29, 09:05 UTC | Jun 30, 08:50 UTC | 23h 46m |
| 2026-06-29 | SRR901 | - | Jun 29, 06:24 UTC | Jun 29, 10:24 UTC | 4h 0m |
| 2026-06-28 | SRR902 | - | Jun 28, 14:59 UTC | Jun 28, 16:05 UTC | 1h 5m |
| 2026-06-28 | SRR902 | - | Jun 28, 07:25 UTC | Jun 28, 12:19 UTC | 4h 55m |
| 2026-06-27 | SRR902 | - | Jun 27, 11:04 UTC | Jun 28, 11:00 UTC | 23h 55m |
| 2026-06-27 | SRR901 | - | Jun 27, 09:04 UTC | Jun 28, 08:39 UTC | 23h 35m |
| 2026-06-27 | SRR901 | - | Jun 27, 07:19 UTC | Jun 27, 11:09 UTC | 3h 50m |
| 2026-06-26 | SRR902 | - | Jun 26, 15:20 UTC | Jun 26, 16:30 UTC | 1h 10m |
| 2026-06-26 | SRR902 | - | Jun 26, 07:30 UTC | Jun 26, 12:39 UTC | 5h 10m |
| 2026-06-25 | SRR902 | - | Jun 25, 09:34 UTC | Jun 26, 08:45 UTC | 23h 10m |
| 2026-06-25 | SRR901 | - | Jun 25, 06:14 UTC | Jun 25, 10:04 UTC | 3h 50m |
| 2026-06-24 | SRR902 | - | Jun 24, 15:14 UTC | Jun 24, 16:24 UTC | 1h 10m |
| 2026-06-24 | SRR902 | - | Jun 24, 07:20 UTC | Jun 24, 12:14 UTC | 4h 55m |
| 2026-06-23 | SRR902 | - | Jun 23, 09:34 UTC | Jun 24, 09:00 UTC | 23h 25m |
| 2026-06-23 | SRR901 | - | Jun 23, 06:19 UTC | Jun 23, 10:15 UTC | 3h 55m |
| 2026-06-22 | SRR902 | BHX → BLL | Jun 22, 14:59 UTC | Jun 22, 16:14 UTC | 1h 15m |
| 2026-06-22 | SRR902 | - | Jun 22, 07:25 UTC | Jun 22, 12:34 UTC | 5h 10m |
| 2026-06-21 | SRR902 | - | Jun 21, 09:15 UTC | Jun 22, 08:40 UTC | 23h 25m |
| 2026-06-21 | SRR901 | - | Jun 21, 06:14 UTC | Jun 21, 10:09 UTC | 3h 55m |
| 2026-06-20 | SRR902 | - | Jun 20, 15:09 UTC | Jun 20, 16:14 UTC | 1h 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 OY-MAD page for operator, model, and routing details .