sensors Mode-S transponder
4B449A
ICAO 24-bit transponder address · allocated to Switzerland
Currently assigned to HB-ZZM · MCDONNELL-DOUGLAS MD-900 Explorer
- Hex
- 4B449A
- Octal
- 22642232
- Decimal
- 4,932,762
- Country
- CH
- Tail
- HB-ZZM
- Type
- EXPL
- Flights observed
- 49
- Distinct callsigns
- 4
- Country
- CH
- Last broadcast
- 13d ago
Last known position
Country allocation
The ICAO 24-bit address 4B449A falls within the block assigned to Switzerland (CH) by ICAO Annex 10, Volume III. Every aircraft registered in Switzerland 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 49
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-23 | MARTIN2 | - | Jul 23, 12:50 UTC | Jul 23, 13:00 UTC | 10m |
| 2026-07-21 | MARTIN2 | - | Jul 21, 15:20 UTC | Jul 21, 15:35 UTC | 15m |
| 2026-07-18 | MARTIN2 | - | Jul 18, 10:00 UTC | Jul 18, 10:20 UTC | 20m |
| 2026-07-17 | MARTIN2 | - | Jul 17, 09:45 UTC | Jul 17, 10:00 UTC | 15m |
| 2026-07-16 | MARTIN2 | - | Jul 16, 11:30 UTC | Jul 16, 11:54 UTC | 25m |
| 2026-07-16 | MARTIN2 | - | Jul 16, 06:35 UTC | Jul 16, 06:50 UTC | 15m |
| 2026-07-13 | MARTIN2 | - | Jul 13, 15:10 UTC | Jul 13, 15:40 UTC | 30m |
| 2026-07-13 | MARTIN2 | - | Jul 13, 09:30 UTC | Jul 13, 09:45 UTC | 15m |
| 2026-07-12 | MARTIN2 | - | Jul 12, 17:25 UTC | Jul 12, 17:55 UTC | 30m |
| 2026-07-12 | MARTIN2 | - | Jul 12, 14:25 UTC | Jul 12, 15:30 UTC | 1h 5m |
| 2026-07-12 | MARTIN2 | - | Jul 12, 10:40 UTC | Jul 12, 10:55 UTC | 15m |
| 2026-07-11 | MARTIN2 | - | Jul 11, 12:35 UTC | Jul 11, 13:10 UTC | 35m |
| 2026-07-10 | MARTIN2 | - | Jul 10, 17:20 UTC | Jul 10, 17:45 UTC | 25m |
| 2026-07-10 | MARTIN2 | - | Jul 10, 11:10 UTC | Jul 10, 11:45 UTC | 35m |
| 2026-07-08 | MARTIN2 | - | Jul 8, 09:10 UTC | Jul 8, 09:35 UTC | 25m |
| 2026-07-07 | MARTIN2 | - | Jul 7, 08:55 UTC | Jul 7, 09:05 UTC | 10m |
| 2026-07-06 | MARTIN2 | - | Jul 6, 16:15 UTC | Jul 6, 16:50 UTC | 35m |
| 2026-07-05 | MARTIN2 | - | Jul 5, 14:35 UTC | Jul 5, 15:10 UTC | 35m |
| 2026-07-05 | MARTIN2 | - | Jul 5, 11:35 UTC | Jul 5, 12:00 UTC | 25m |
| 2026-06-26 | MARTIN2 | - | Jun 26, 14:19 UTC | Jun 26, 14:59 UTC | 40m |
| 2026-06-26 | MARTIN2 | - | Jun 26, 13:19 UTC | Jun 26, 13:34 UTC | 15m |
| 2026-06-26 | MARTIN2 | - | Jun 26, 12:05 UTC | Jun 26, 12:39 UTC | 35m |
| 2026-06-26 | MARTIN2 | - | Jun 26, 11:00 UTC | Jun 26, 11:30 UTC | 30m |
| 2026-06-24 | MARTIN1 | - | Jun 24, 11:24 UTC | Jun 24, 11:50 UTC | 25m |
| 2026-05-20 | MARTIN1 | - | May 20, 15:05 UTC | May 20, 15:35 UTC | 30m |
| 2026-05-13 | MARTIN3 | - | May 13, 17:50 UTC | May 13, 18:00 UTC | 10m |
| 2026-05-13 | MARTIN3 | - | May 13, 16:00 UTC | May 13, 16:35 UTC | 35m |
| 2026-05-13 | MARTIN3 | - | May 13, 08:55 UTC | May 13, 09:30 UTC | 35m |
| 2026-05-13 | MARTIN3 | - | May 13, 06:45 UTC | May 13, 07:20 UTC | 35m |
| 2026-05-12 | MARTIN3 | - | May 12, 11:40 UTC | May 12, 13:00 UTC | 1h 20m |
| 2026-05-12 | MARTIN3 | - | May 12, 08:45 UTC | May 12, 09:05 UTC | 20m |
| 2026-05-12 | MARTIN3 | - | May 12, 07:30 UTC | May 12, 07:40 UTC | 10m |
| 2026-05-11 | MARTIN3 | - | May 11, 09:05 UTC | May 11, 10:20 UTC | 1h 15m |
| 2026-05-10 | MARTIN3 | - | May 10, 12:59 UTC | May 10, 14:00 UTC | 1h 0m |
| 2026-05-10 | MARTIN3 | - | May 10, 11:20 UTC | May 10, 12:00 UTC | 40m |
| 2026-05-09 | MARTIN3 | - | May 9, 12:15 UTC | May 9, 12:25 UTC | 10m |
| 2026-05-09 | MARTIN3 | - | May 9, 10:35 UTC | May 9, 11:45 UTC | 1h 10m |
| 2026-05-09 | MARTIN3 | - | May 9, 07:40 UTC | May 9, 08:15 UTC | 35m |
| 2026-05-08 | MARTIN3 | - | May 8, 15:55 UTC | May 8, 17:20 UTC | 1h 25m |
| 2026-05-08 | MARTIN3 | - | May 8, 14:25 UTC | May 8, 15:00 UTC | 35m |
| 2026-05-08 | MARTIN3 | - | May 8, 13:35 UTC | May 8, 13:50 UTC | 15m |
| 2026-05-07 | MARTIN3 | - | May 7, 12:20 UTC | May 7, 13:50 UTC | 1h 30m |
| 2026-05-07 | MARTIN3 | - | May 7, 11:25 UTC | May 7, 12:15 UTC | 50m |
| 2026-05-07 | MARTIN3 | - | May 7, 08:00 UTC | May 7, 09:30 UTC | 1h 30m |
| 2026-05-07 | MARTIN3 | - | May 7, 07:10 UTC | May 7, 07:30 UTC | 20m |
| 2026-05-06 | MARTIN3 | - | May 6, 07:50 UTC | May 6, 08:10 UTC | 20m |
| 2026-05-06 | MARTIN1 | - | May 6, 05:50 UTC | May 6, 06:05 UTC | 15m |
| 2026-04-30 | MARTIN1 | - | Apr 30, 15:50 UTC | Apr 30, 16:30 UTC | 40m |
| 2026-04-29 | MARTIN8 | - | Apr 29, 05:55 UTC | Apr 29, 06:15 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 HB-ZZM page for operator, model, and routing details .