sensors Mode-S transponder
4A4CA1
ICAO 24-bit transponder address · allocated to Romania
Currently assigned to YR-SEA · AIRBUS A-320
- Hex
- 4A4CA1
- Octal
- 22446241
- Decimal
- 4,869,281
- Country
- RO
- Tail
- YR-SEA
- Type
- A320
- Flights observed
- 29
- Distinct callsigns
- 11
- Country
- RO
- Last broadcast
- Jul 26, 12:35 UTC
Last known position
Country allocation
The ICAO 24-bit address 4A4CA1 falls within the block assigned to Romania (RO) by ICAO Annex 10, Volume III. Every aircraft registered in Romania 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 11 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| HYM345 | - | 8 | 2026-07-25 |
| HYM346 | Himalayan Airlines | 6 | 2026-07-26 |
| HYM412 | Himalayan Airlines | 3 | 2026-07-23 |
| HYM411 | Himalayan Airlines | 3 | 2026-07-23 |
| HYM402 | - | 2 | 2026-07-22 |
| HYM401 | - | 2 | 2026-07-22 |
| SEK1214 | - | 1 | 2026-07-15 |
| SEK1213 | - | 1 | 2026-07-15 |
| SEK1212 | - | 1 | 2026-07-12 |
| SEK1211 | - | 1 | 2026-07-12 |
| HYM044P | - | 1 | 2026-07-16 |
Recent flights last 29
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | HYM346 | SSH → RMO | Jul 26, 03:50 UTC | Jul 26, 12:35 UTC | 8h 46m |
| 2026-07-25 | HYM345 | - | Jul 25, 10:20 UTC | Jul 26, 10:15 UTC | 23h 56m |
| 2026-07-25 | HYM346 | SSH → RMO | Jul 25, 08:35 UTC | Jul 26, 06:05 UTC | 21h 30m |
| 2026-07-25 | HYM345 | - | Jul 25, 04:00 UTC | Jul 25, 06:40 UTC | 2h 40m |
| 2026-07-24 | HYM346 | SSH → RMO | Jul 24, 06:50 UTC | Jul 24, 09:10 UTC | 2h 20m |
| 2026-07-24 | HYM345 | - | Jul 24, 02:35 UTC | Jul 24, 05:00 UTC | 2h 25m |
| 2026-07-23 | HYM412 | STN → RMO | Jul 23, 17:30 UTC | Jul 23, 20:05 UTC | 2h 35m |
| 2026-07-23 | HYM411 | RMO → STN | Jul 23, 13:00 UTC | Jul 23, 15:50 UTC | 2h 50m |
| 2026-07-23 | HYM346 | SSH → RMO | Jul 23, 08:10 UTC | Jul 23, 10:35 UTC | 2h 25m |
| 2026-07-23 | HYM345 | - | Jul 23, 04:25 UTC | Jul 23, 06:10 UTC | 1h 45m |
| 2026-07-22 | HYM402 | - | Jul 22, 14:30 UTC | Jul 22, 16:10 UTC | 1h 40m |
| 2026-07-22 | HYM401 | - | Jul 22, 02:15 UTC | Jul 22, 12:55 UTC | 10h 40m |
| 2026-07-21 | HYM346 | SSH → RMO | Jul 21, 15:05 UTC | Jul 21, 17:35 UTC | 2h 30m |
| 2026-07-21 | HYM345 | - | Jul 21, 10:40 UTC | Jul 21, 13:05 UTC | 2h 25m |
| 2026-07-21 | HYM346 | SSH → RMO | Jul 21, 02:40 UTC | Jul 21, 05:05 UTC | 2h 25m |
| 2026-07-20 | HYM345 | - | Jul 20, 23:20 UTC | Jul 21, 00:50 UTC | 1h 29m |
| 2026-07-20 | HYM402 | FRA → IAS | Jul 20, 18:45 UTC | Jul 20, 20:25 UTC | 1h 40m |
| 2026-07-20 | HYM401 | - | Jul 20, 12:05 UTC | Jul 20, 14:05 UTC | 2h 0m |
| 2026-07-19 | HYM412 | STN → RMO | Jul 19, 21:25 UTC | Jul 19, 23:50 UTC | 2h 25m |
| 2026-07-19 | HYM411 | RMO → STN | Jul 19, 17:10 UTC | Jul 19, 20:05 UTC | 2h 55m |
| 2026-07-19 | HYM345 | - | Jul 19, 03:40 UTC | Jul 19, 15:15 UTC | 11h 35m |
| 2026-07-18 | HYM412 | STN → RMO | Jul 18, 17:45 UTC | Jul 18, 20:05 UTC | 2h 20m |
| 2026-07-18 | HYM411 | - | Jul 18, 13:35 UTC | Jul 18, 16:05 UTC | 2h 30m |
| 2026-07-18 | HYM345 | - | Jul 18, 04:20 UTC | Jul 18, 11:00 UTC | 6h 40m |
| 2026-07-16 | HYM044P | - | Jul 16, 19:40 UTC | Jul 16, 22:10 UTC | 2h 30m |
| 2026-07-15 | SEK1214 | - | Jul 15, 13:15 UTC | Jul 15, 16:00 UTC | 2h 45m |
| 2026-07-15 | SEK1213 | - | Jul 15, 08:15 UTC | Jul 15, 10:35 UTC | 2h 20m |
| 2026-07-12 | SEK1212 | - | Jul 12, 11:55 UTC | Jul 12, 15:40 UTC | 3h 45m |
| 2026-07-12 | SEK1211 | - | Jul 12, 07:20 UTC | Jul 12, 09:50 UTC | 2h 30m |
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 YR-SEA page for operator, model, and routing details .