sensors Mode-S transponder
151D51
ICAO 24-bit transponder address · allocated to Russia
Currently assigned to RA-73041 · BOEING 737-500
- Hex
- 151D51
- Octal
- 05216521
- Decimal
- 1,383,761
- Country
- RU
- Tail
- RA-73041
- Type
- B735
- Flights observed
- 44
- Distinct callsigns
- 20
- Country
- RU
- Last broadcast
- 10d ago
Last known position
Country allocation
The ICAO 24-bit address 151D51 falls within the block assigned to Russia (RU) by ICAO Annex 10, Volume III. Every aircraft registered in Russia 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 20 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| UTA6472 | - | 3 | 2026-07-04 |
| UTA9421 | - | 2 | 2026-05-06 |
| UTA6578 | - | 2 | 2026-07-14 |
| UTA6489 | UTair Aviation | 2 | 2026-05-04 |
| UTA6126 | - | 2 | 2026-07-12 |
| UTA6125 | - | 2 | 2026-07-11 |
| UTA6123 | - | 2 | 2026-07-09 |
| UTA478 | UTair Aviation | 2 | 2026-05-04 |
| UTA446 | - | 2 | 2026-07-13 |
| UTA445 | - | 2 | 2026-07-13 |
| UTA282 | - | 2 | 2026-07-20 |
| UTA184 | UTair Aviation | 2 | 2026-07-24 |
| UTA151 | - | 2 | 2026-07-08 |
| RA73041 | - | 2 | 2026-04-30 |
| UTA9422 | - | 1 | 2026-05-06 |
| UTA6577 | - | 1 | 2026-07-11 |
| UTA6562 | - | 1 | 2026-07-10 |
| UTA6492 | UTair Aviation | 1 | 2026-05-09 |
| UTA6474 | - | 1 | 2026-05-08 |
| UTA6473 | UTair Aviation | 1 | 2026-05-08 |
Recent flights last 44
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-24 | UTA184 | KZN → SGC | Jul 24, 11:10 UTC | Jul 24, 11:40 UTC | 30m |
| 2026-07-24 | UTA183 | SGC → KZN | Jul 24, 08:20 UTC | Jul 24, 08:50 UTC | 30m |
| 2026-07-20 | UTA282 | - | Jul 20, 07:35 UTC | Jul 20, 10:40 UTC | 3h 5m |
| 2026-07-18 | UTA185 | - | Jul 18, 09:10 UTC | Jul 18, 20:15 UTC | 11h 5m |
| 2026-07-17 | UTA403 | SGC → UFA | Jul 17, 08:30 UTC | Jul 17, 21:05 UTC | 12h 35m |
| 2026-07-15 | UTA282 | - | Jul 15, 07:50 UTC | Jul 15, 10:30 UTC | 2h 40m |
| 2026-07-14 | UTA6578 | - | Jul 14, 16:25 UTC | Jul 15, 00:05 UTC | 7h 39m |
| 2026-07-14 | UTA6578 | - | Jul 14, 01:05 UTC | Jul 15, 00:05 UTC | 22h 59m |
| 2026-07-13 | UTA445 | - | Jul 13, 12:30 UTC | Jul 14, 01:05 UTC | 12h 35m |
| 2026-07-13 | UTA446 | - | Jul 13, 06:30 UTC | Jul 13, 06:55 UTC | 25m |
| 2026-07-12 | UTA6126 | - | Jul 12, 14:45 UTC | Jul 13, 01:05 UTC | 10h 20m |
| 2026-07-11 | UTA6125 | - | Jul 11, 12:30 UTC | Jul 12, 05:40 UTC | 17h 10m |
| 2026-07-11 | UTA6577 | - | Jul 11, 01:15 UTC | Jul 11, 12:35 UTC | 11h 20m |
| 2026-07-10 | UTA6562 | - | Jul 10, 16:20 UTC | Jul 11, 12:35 UTC | 20h 15m |
| 2026-07-10 | UTA445 | - | Jul 10, 10:30 UTC | Jul 11, 05:45 UTC | 19h 16m |
| 2026-07-09 | UTA446 | - | Jul 9, 13:00 UTC | Jul 10, 07:35 UTC | 18h 35m |
| 2026-07-09 | UTA6123 | - | Jul 9, 01:45 UTC | Jul 9, 13:05 UTC | 11h 20m |
| 2026-07-08 | UTA6123 | - | Jul 8, 18:00 UTC | Jul 9, 13:05 UTC | 19h 5m |
| 2026-07-08 | UTA151 | - | Jul 8, 11:15 UTC | Jul 9, 01:50 UTC | 14h 35m |
| 2026-07-07 | UTA151 | - | Jul 7, 16:50 UTC | Jul 8, 14:05 UTC | 21h 15m |
| 2026-07-07 | UTA186 | NUX → UFA | Jul 7, 13:55 UTC | Jul 8, 11:20 UTC | 21h 25m |
| 2026-07-07 | UTA6103 | - | Jul 7, 04:25 UTC | Jul 7, 16:55 UTC | 12h 30m |
| 2026-07-05 | UTA6126 | - | Jul 5, 15:45 UTC | Jul 6, 00:20 UTC | 8h 35m |
| 2026-07-04 | UTA6125 | - | Jul 4, 17:00 UTC | Jul 5, 06:40 UTC | 13h 40m |
| 2026-07-04 | UTA6472 | - | Jul 4, 06:20 UTC | Jul 5, 06:15 UTC | 23h 55m |
| 2026-07-04 | UTA6472 | - | Jul 4, 06:00 UTC | Jul 4, 17:05 UTC | 11h 5m |
| 2026-07-03 | UTA6472 | - | Jul 3, 21:35 UTC | Jul 4, 17:05 UTC | 19h 30m |
| 2026-05-10 | UTA6150 | - | May 10, 10:45 UTC | May 10, 11:10 UTC | 25m |
| 2026-05-10 | UTA6130 | - | May 10, 09:45 UTC | May 10, 10:10 UTC | 25m |
| 2026-05-09 | UTA6492 | OVB → SGC | May 9, 06:15 UTC | May 9, 06:30 UTC | 15m |
| 2026-05-08 | UTA184 | KZN → SGC | May 8, 21:00 UTC | May 9, 04:05 UTC | 7h 5m |
| 2026-05-08 | UTA6473 | TLK → SGC | May 8, 06:45 UTC | May 8, 19:05 UTC | 12h 20m |
| 2026-05-08 | UTA6474 | - | May 8, 04:14 UTC | May 8, 04:49 UTC | 35m |
| 2026-05-06 | UTA9422 | - | May 6, 16:45 UTC | May 6, 18:20 UTC | 1h 34m |
| 2026-05-06 | UTA9421 | - | May 6, 13:45 UTC | May 6, 15:25 UTC | 1h 40m |
| 2026-05-05 | UTA9421 | - | May 5, 18:30 UTC | May 6, 15:25 UTC | 20h 55m |
| 2026-05-05 | UTA6420 | NUX → TJM | May 5, 17:05 UTC | May 6, 15:25 UTC | 22h 20m |
| 2026-05-04 | UTA6489 | VKO → KUF | May 4, 20:25 UTC | May 5, 15:05 UTC | 18h 40m |
| 2026-05-04 | UTA6489 | VKO → KUF | May 4, 19:50 UTC | May 5, 15:05 UTC | 19h 15m |
| 2026-05-04 | UTA478 | KUF → SGC | May 4, 06:20 UTC | May 5, 03:15 UTC | 20h 56m |
| 2026-05-04 | UTA478 | KUF → SGC | May 4, 06:10 UTC | May 5, 03:15 UTC | 21h 6m |
| 2026-05-03 | UTA477 | SGC → KUF | May 3, 18:05 UTC | May 4, 06:55 UTC | 12h 50m |
| 2026-04-30 | RA73041 | - | Apr 30, 14:45 UTC | May 1, 09:05 UTC | 18h 20m |
| 2026-04-30 | RA73041 | - | Apr 30, 10:55 UTC | May 1, 09:05 UTC | 22h 10m |
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 RA-73041 page for operator, model, and routing details .