sensors Mode-S transponder
511173
ICAO 24-bit transponder address · allocated to Estonia
Currently assigned to ES-NTC · ATR-72-500
- Hex
- 511173
- Octal
- 24210563
- Decimal
- 5,312,883
- Country
- EE
- Tail
- ES-NTC
- Type
- AT75
- Flights observed
- 32
- Distinct callsigns
- 5
- Country
- EE
- Last broadcast
- 15d ago
Last known position
Country allocation
The ICAO 24-bit address 511173 falls within the block assigned to Estonia (EE) by ICAO Annex 10, Volume III. Every aircraft registered in Estonia 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 5 distinct
Recent flights last 32
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-14 | NYX770P | LEJ → TLL | May 14, 09:20 UTC | May 14, 11:40 UTC | 2h 20m |
| 2026-05-11 | NYX4911 | BSL → LEJ | May 11, 18:30 UTC | May 11, 19:45 UTC | 1h 15m |
| 2026-05-10 | NYX4904 | LEJ → BSL | May 10, 18:39 UTC | May 10, 20:05 UTC | 1h 25m |
| 2026-05-08 | NYX770P | - | May 8, 19:10 UTC | May 8, 20:50 UTC | 1h 40m |
| 2026-05-08 | NYX4906 | LEJ → GVA | May 8, 03:04 UTC | May 8, 05:20 UTC | 2h 15m |
| 2026-05-07 | NYX4911 | - | May 7, 18:40 UTC | May 7, 19:50 UTC | 1h 10m |
| 2026-05-06 | NYX4911 | - | May 6, 18:35 UTC | May 6, 19:05 UTC | 30m |
| 2026-05-06 | NYX4906 | LEJ → BSL | May 6, 03:20 UTC | May 6, 04:50 UTC | 1h 30m |
| 2026-04-27 | NYX4911 | - | Apr 27, 18:40 UTC | Apr 27, 19:55 UTC | 1h 15m |
| 2026-04-26 | NYX4904 | LEJ → BSL | Apr 26, 18:20 UTC | Apr 26, 19:35 UTC | 1h 15m |
| 2026-04-24 | NYX4911 | - | Apr 24, 18:45 UTC | Apr 24, 20:10 UTC | 1h 25m |
| 2026-04-24 | NYX4906 | LEJ → BSL | Apr 24, 02:15 UTC | Apr 24, 03:30 UTC | 1h 15m |
| 2026-04-23 | NYX4911 | - | Apr 23, 19:20 UTC | Apr 23, 20:45 UTC | 1h 25m |
| 2026-04-23 | NYX4906 | LEJ → BSL | Apr 23, 03:00 UTC | Apr 23, 04:15 UTC | 1h 15m |
| 2026-04-22 | NYX4911 | - | Apr 22, 20:55 UTC | Apr 22, 22:25 UTC | 1h 30m |
| 2026-04-22 | NYX4906 | LEJ → BSL | Apr 22, 03:45 UTC | Apr 22, 05:05 UTC | 1h 20m |
| 2026-04-21 | NYX4911 | - | Apr 21, 20:30 UTC | Apr 21, 21:50 UTC | 1h 20m |
| 2026-04-21 | NYX4906 | LEJ → BSL | Apr 21, 02:15 UTC | Apr 21, 03:35 UTC | 1h 20m |
| 2026-04-20 | NYX4911 | - | Apr 20, 18:45 UTC | Apr 20, 20:00 UTC | 1h 15m |
| 2026-04-19 | NYX4904 | LEJ → BSL | Apr 19, 18:35 UTC | Apr 19, 20:00 UTC | 1h 25m |
| 2026-04-17 | NYX4911 | - | Apr 17, 19:25 UTC | Apr 17, 20:00 UTC | 35m |
| 2026-04-17 | NYX4911 | - | Apr 17, 18:45 UTC | Apr 17, 19:20 UTC | 35m |
| 2026-04-17 | NYX4906 | - | Apr 17, 03:20 UTC | Apr 17, 04:00 UTC | 40m |
| 2026-04-17 | NYX4906 | - | Apr 17, 02:40 UTC | Apr 17, 03:15 UTC | 35m |
| 2026-04-16 | NYX4911 | - | Apr 16, 19:15 UTC | Apr 16, 20:05 UTC | 50m |
| 2026-04-16 | NYX4911 | - | Apr 16, 18:45 UTC | Apr 16, 19:10 UTC | 25m |
| 2026-04-16 | NYX4906 | - | Apr 16, 03:09 UTC | Apr 16, 04:10 UTC | 1h 0m |
| 2026-04-16 | NYX4906 | - | Apr 16, 02:45 UTC | Apr 16, 03:04 UTC | 20m |
| 2026-04-15 | NYX4911 | BSL → LEJ | Apr 15, 19:10 UTC | Apr 15, 20:25 UTC | 1h 15m |
| 2026-04-15 | NYX4906 | - | Apr 15, 05:00 UTC | Apr 15, 05:35 UTC | 35m |
| 2026-04-15 | NYX4906 | - | Apr 15, 04:15 UTC | Apr 15, 04:50 UTC | 35m |
| 2026-04-13 | NYX300 | DUB → DUB | Apr 13, 20:50 UTC | Apr 13, 23:40 UTC | 2h 50m |
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 ES-NTC page for operator, model, and routing details .