sensors Mode-S transponder
34738B
ICAO 24-bit transponder address · allocated to Spain
Currently assigned to HU.26-40A · AIRBUS HELICOPTERS EC-135/635
- Hex
- 34738B
- Octal
- 15071613
- Decimal
- 3,437,451
- Country
- ES
- Tail
- HU.26-40A
- Type
- EC35
- Flights observed
- 76
- Distinct callsigns
- 15
- Country
- ES
- Last broadcast
- 12h ago
Last known position
Country allocation
The ICAO 24-bit address 34738B falls within the block assigned to Spain (ES) by ICAO Annex 10, Volume III. Every aircraft registered in Spain 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 15 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| CUCO320 | - | 57 | 2026-07-17 |
| YELMO05 | - | 4 | 2026-06-10 |
| YELMO07 | - | 2 | 2026-06-09 |
| YELMO03 | - | 2 | 2026-06-11 |
| YELMO01 | - | 1 | 2026-06-12 |
| GALGO81 | - | 1 | 2026-04-23 |
| GALGO61 | - | 1 | 2026-04-23 |
| GALGO23 | - | 1 | 2026-05-12 |
| GALGO22 | - | 1 | 2026-04-21 |
| GALGO21 | - | 1 | 2026-04-30 |
| GALGO13 | - | 1 | 2026-04-27 |
| GALGO12 | - | 1 | 2026-05-05 |
| GALGO11 | - | 1 | 2026-05-22 |
| GALGO03 | - | 1 | 2026-04-30 |
| GALGO01 | - | 1 | 2026-05-08 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-17 | CUCO320 | - | Jul 17, 14:15 UTC | Jul 17, 14:39 UTC | 25m |
| 2026-07-17 | CUCO320 | - | Jul 17, 07:50 UTC | Jul 17, 08:20 UTC | 30m |
| 2026-07-09 | CUCO320 | - | Jul 9, 14:55 UTC | Jul 9, 16:05 UTC | 1h 10m |
| 2026-07-09 | CUCO320 | - | Jul 9, 03:25 UTC | Jul 9, 04:20 UTC | 55m |
| 2026-07-08 | CUCO320 | - | Jul 8, 10:35 UTC | Jul 8, 11:35 UTC | 1h 0m |
| 2026-07-08 | CUCO320 | - | Jul 8, 08:20 UTC | Jul 8, 08:40 UTC | 20m |
| 2026-07-08 | CUCO320 | - | Jul 8, 01:15 UTC | Jul 8, 03:10 UTC | 1h 55m |
| 2026-07-05 | CUCO320 | - | Jul 5, 17:50 UTC | Jul 5, 18:00 UTC | 10m |
| 2026-07-05 | CUCO320 | - | Jul 5, 07:55 UTC | Jul 5, 08:30 UTC | 35m |
| 2026-07-05 | CUCO320 | - | Jul 5, 06:15 UTC | Jul 5, 07:20 UTC | 1h 5m |
| 2026-07-04 | CUCO320 | - | Jul 4, 19:10 UTC | Jul 4, 19:35 UTC | 25m |
| 2026-07-04 | CUCO320 | - | Jul 4, 15:55 UTC | Jul 4, 17:05 UTC | 1h 10m |
| 2026-07-03 | CUCO320 | - | Jul 3, 16:55 UTC | Jul 3, 18:00 UTC | 1h 5m |
| 2026-07-03 | CUCO320 | - | Jul 3, 10:25 UTC | Jul 3, 11:35 UTC | 1h 10m |
| 2026-07-01 | CUCO320 | - | Jul 1, 10:25 UTC | Jul 1, 11:05 UTC | 40m |
| 2026-07-01 | CUCO320 | - | Jul 1, 06:20 UTC | Jul 1, 07:05 UTC | 45m |
| 2026-06-29 | CUCO320 | - | Jun 29, 11:50 UTC | Jun 29, 12:09 UTC | 20m |
| 2026-06-29 | CUCO320 | - | Jun 29, 07:05 UTC | Jun 29, 07:25 UTC | 20m |
| 2026-06-28 | CUCO320 | - | Jun 28, 17:44 UTC | Jun 28, 18:14 UTC | 30m |
| 2026-06-28 | CUCO320 | - | Jun 28, 11:39 UTC | Jun 28, 11:55 UTC | 15m |
| 2026-06-27 | CUCO320 | - | Jun 27, 13:00 UTC | Jun 27, 13:09 UTC | 10m |
| 2026-06-27 | CUCO320 | - | Jun 27, 10:34 UTC | Jun 27, 10:50 UTC | 15m |
| 2026-06-23 | CUCO320 | - | Jun 23, 09:34 UTC | Jun 23, 10:19 UTC | 45m |
| 2026-06-12 | YELMO01 | - | Jun 12, 07:25 UTC | Jun 12, 08:25 UTC | 1h 0m |
| 2026-06-11 | YELMO03 | - | Jun 11, 10:05 UTC | Jun 11, 10:45 UTC | 40m |
| 2026-06-11 | YELMO03 | - | Jun 11, 07:05 UTC | Jun 11, 09:15 UTC | 2h 10m |
| 2026-06-10 | YELMO05 | - | Jun 10, 15:10 UTC | Jun 10, 15:20 UTC | 10m |
| 2026-06-10 | CUCO320 | - | Jun 10, 11:50 UTC | Jun 10, 12:55 UTC | 1h 5m |
| 2026-06-10 | YELMO05 | - | Jun 10, 10:15 UTC | Jun 10, 11:00 UTC | 45m |
| 2026-06-10 | YELMO05 | - | Jun 10, 07:10 UTC | Jun 10, 07:25 UTC | 15m |
| 2026-06-09 | YELMO07 | - | Jun 9, 08:00 UTC | Jun 9, 12:30 UTC | 4h 30m |
| 2026-06-09 | YELMO07 | - | Jun 9, 07:05 UTC | Jun 9, 07:20 UTC | 15m |
| 2026-06-08 | CUCO320 | - | Jun 8, 13:55 UTC | Jun 8, 14:45 UTC | 50m |
| 2026-06-08 | YELMO05 | - | Jun 8, 11:40 UTC | Jun 8, 12:35 UTC | 55m |
| 2026-06-03 | CUCO320 | - | Jun 3, 12:15 UTC | Jun 3, 12:30 UTC | 15m |
| 2026-05-22 | GALGO11 | - | May 22, 08:30 UTC | May 22, 09:10 UTC | 40m |
| 2026-05-19 | CUCO320 | - | May 19, 08:40 UTC | May 19, 09:45 UTC | 1h 5m |
| 2026-05-14 | CUCO320 | - | May 14, 07:30 UTC | May 14, 08:25 UTC | 55m |
| 2026-05-13 | CUCO320 | - | May 13, 06:05 UTC | May 13, 06:30 UTC | 25m |
| 2026-05-12 | GALGO23 | - | May 12, 08:20 UTC | May 12, 08:45 UTC | 25m |
| 2026-05-12 | CUCO320 | MAD → TOJ | May 12, 04:20 UTC | May 12, 04:50 UTC | 30m |
| 2026-05-09 | CUCO320 | - | May 9, 21:30 UTC | May 9, 22:30 UTC | 1h 0m |
| 2026-05-08 | GALGO01 | - | May 8, 10:49 UTC | May 8, 11:05 UTC | 15m |
| 2026-05-07 | CUCO320 | - | May 7, 18:25 UTC | May 7, 19:45 UTC | 1h 20m |
| 2026-05-07 | CUCO320 | - | May 7, 16:45 UTC | May 7, 17:30 UTC | 45m |
| 2026-05-05 | GALGO12 | - | May 5, 09:00 UTC | May 5, 09:15 UTC | 15m |
| 2026-05-04 | CUCO320 | - | May 4, 11:00 UTC | May 4, 11:15 UTC | 15m |
| 2026-05-04 | CUCO320 | - | May 4, 07:55 UTC | May 4, 08:25 UTC | 30m |
| 2026-05-03 | CUCO320 | - | May 3, 10:25 UTC | May 3, 10:50 UTC | 25m |
| 2026-05-03 | CUCO320 | - | May 3, 09:00 UTC | May 3, 09:25 UTC | 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 HU.26-40A page for operator, model, and routing details .