sensors Mode-S transponder
151D81
ICAO 24-bit transponder address · allocated to Russia
Currently assigned to RA-73089 · BOEING 737-800
- Hex
- 151D81
- Octal
- 05216601
- Decimal
- 1,383,809
- Country
- RU
- Tail
- RA-73089
- Type
- B738
- Flights observed
- 178
- Distinct callsigns
- 20
- Country
- RU
- Last broadcast
- 1h ago
Last known position
Country allocation
The ICAO 24-bit address 151D81 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 |
|---|---|---|---|
| UTA784 | - | 24 | 2026-07-14 |
| UTA783 | - | 22 | 2026-07-14 |
| UTA786 | - | 12 | 2026-07-13 |
| UTA810 | - | 10 | 2026-07-09 |
| UTA400 | UTair Aviation | 9 | 2026-07-12 |
| UTA785 | - | 8 | 2026-07-12 |
| UTA809 | - | 6 | 2026-06-29 |
| UTA808 | - | 6 | 2026-07-08 |
| UTA728 | UTair Aviation | 6 | 2026-06-05 |
| UTA701 | - | 6 | 2026-07-04 |
| UTA572 | - | 6 | 2026-06-12 |
| UTA454 | - | 5 | 2026-07-08 |
| UTA811 | - | 4 | 2026-07-02 |
| UTA806 | UTair Aviation | 4 | 2026-05-26 |
| UTA559 | - | 4 | 2026-07-11 |
| UTA875 | - | 3 | 2026-07-05 |
| UTA802 | - | 3 | 2026-07-10 |
| UTA727 | UTair Aviation | 3 | 2026-06-01 |
| UTA702 | UTair Aviation | 3 | 2026-07-04 |
| UTA358 | - | 3 | 2026-07-01 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-14 | UTA784 | - | Jul 14, 14:30 UTC | Jul 14, 18:15 UTC | 3h 45m |
| 2026-07-14 | UTA783 | - | Jul 14, 08:05 UTC | Jul 14, 12:45 UTC | 4h 40m |
| 2026-07-13 | UTA807 | - | Jul 13, 20:35 UTC | Jul 14, 05:15 UTC | 8h 40m |
| 2026-07-13 | UTA784 | - | Jul 13, 14:15 UTC | Jul 13, 18:55 UTC | 4h 40m |
| 2026-07-13 | UTA783 | - | Jul 13, 07:55 UTC | Jul 13, 12:40 UTC | 4h 45m |
| 2026-07-13 | UTA786 | - | Jul 13, 01:55 UTC | Jul 13, 02:30 UTC | 35m |
| 2026-07-12 | UTA786 | - | Jul 12, 23:05 UTC | Jul 13, 01:05 UTC | 2h 0m |
| 2026-07-12 | UTA785 | - | Jul 12, 18:20 UTC | Jul 12, 21:15 UTC | 2h 55m |
| 2026-07-12 | UTA400 | GRV → VKO | Jul 12, 15:35 UTC | Jul 12, 16:01 UTC | 25m |
| 2026-07-12 | UTA742 | - | Jul 12, 08:10 UTC | Jul 12, 14:25 UTC | 6h 15m |
| 2026-07-11 | UTA741 | - | Jul 11, 22:35 UTC | Jul 12, 06:35 UTC | 8h 0m |
| 2026-07-11 | UTA250 | - | Jul 11, 15:55 UTC | Jul 11, 16:30 UTC | 35m |
| 2026-07-11 | UTA250 | - | Jul 11, 13:45 UTC | Jul 11, 14:10 UTC | 25m |
| 2026-07-11 | UTA249 | - | Jul 11, 08:55 UTC | Jul 11, 12:05 UTC | 3h 10m |
| 2026-07-11 | UTA559 | - | Jul 11, 01:00 UTC | Jul 11, 07:00 UTC | 6h 0m |
| 2026-07-10 | UTA802 | - | Jul 10, 05:20 UTC | Jul 10, 15:50 UTC | 10h 30m |
| 2026-07-09 | UTA786 | - | Jul 9, 23:25 UTC | Jul 10, 02:10 UTC | 2h 45m |
| 2026-07-09 | UTA785 | - | Jul 9, 18:10 UTC | Jul 9, 20:55 UTC | 2h 45m |
| 2026-07-09 | UTA810 | - | Jul 9, 06:55 UTC | Jul 9, 16:35 UTC | 9h 40m |
| 2026-07-08 | UTA808 | - | Jul 8, 19:45 UTC | Jul 9, 04:20 UTC | 8h 35m |
| 2026-07-08 | UTA464 | TJM → VKO | Jul 8, 07:30 UTC | Jul 8, 15:45 UTC | 8h 15m |
| 2026-07-08 | UTA454 | - | Jul 8, 05:00 UTC | Jul 8, 05:15 UTC | 15m |
| 2026-07-07 | UTA453 | - | Jul 7, 18:30 UTC | Jul 7, 20:10 UTC | 1h 40m |
| 2026-07-07 | UTA810 | - | Jul 7, 07:00 UTC | Jul 7, 16:30 UTC | 9h 30m |
| 2026-07-07 | USTA454 | - | Jul 7, 04:50 UTC | Jul 7, 05:15 UTC | 25m |
| 2026-07-05 | UTA1514 | - | Jul 5, 19:30 UTC | Jul 5, 20:00 UTC | 30m |
| 2026-07-05 | UTA876 | - | Jul 5, 07:40 UTC | Jul 5, 17:45 UTC | 10h 5m |
| 2026-07-05 | UTA875 | - | Jul 5, 05:10 UTC | Jul 5, 05:40 UTC | 30m |
| 2026-07-04 | UTA702 | IST → TJM | Jul 4, 08:35 UTC | Jul 5, 05:40 UTC | 21h 5m |
| 2026-07-04 | UTA701 | - | Jul 4, 02:20 UTC | Jul 4, 06:50 UTC | 4h 30m |
| 2026-07-03 | UTA701 | - | Jul 3, 10:30 UTC | Jul 4, 06:50 UTC | 20h 20m |
| 2026-07-02 | UTA811 | - | Jul 2, 17:45 UTC | Jul 3, 08:50 UTC | 15h 5m |
| 2026-07-02 | UTA296 | - | Jul 2, 08:50 UTC | Jul 2, 16:10 UTC | 7h 20m |
| 2026-07-02 | UTA400 | GRV → VKO | Jul 2, 06:20 UTC | Jul 2, 06:35 UTC | 15m |
| 2026-07-01 | UTA355 | VKO → GRV | Jul 1, 22:55 UTC | Jul 1, 23:35 UTC | 40m |
| 2026-07-01 | UTA358 | - | Jul 1, 19:40 UTC | Jul 1, 20:55 UTC | 1h 15m |
| 2026-07-01 | UTA357 | - | Jul 1, 17:05 UTC | Jul 1, 18:05 UTC | 1h 0m |
| 2026-07-01 | UTA802 | - | Jul 1, 05:10 UTC | Jul 1, 15:30 UTC | 10h 20m |
| 2026-06-30 | UTA358 | - | Jun 30, 22:40 UTC | Jun 30, 23:50 UTC | 1h 10m |
| 2026-06-30 | UTA357 | - | Jun 30, 19:35 UTC | Jun 30, 20:30 UTC | 55m |
| 2026-06-30 | UTA802 | - | Jun 30, 06:05 UTC | Jun 30, 16:10 UTC | 10h 5m |
| 2026-06-29 | UTA786 | - | Jun 29, 23:14 UTC | Jun 30, 02:30 UTC | 3h 16m |
| 2026-06-29 | UTA785 | - | Jun 29, 18:14 UTC | Jun 29, 20:54 UTC | 2h 40m |
| 2026-06-29 | UTA809 | - | Jun 29, 06:59 UTC | Jun 29, 15:49 UTC | 8h 50m |
| 2026-06-28 | UTA454 | - | Jun 28, 10:24 UTC | Jun 29, 04:50 UTC | 18h 25m |
| 2026-06-28 | UTA454 | - | Jun 28, 08:19 UTC | Jun 29, 04:50 UTC | 20h 30m |
| 2026-06-28 | UTA454 | - | Jun 28, 08:05 UTC | Jun 29, 04:50 UTC | 20h 45m |
| 2026-06-27 | UTA875 | TJM → EVN | Jun 27, 10:19 UTC | Jun 28, 06:05 UTC | 19h 45m |
| 2026-06-27 | UTA702 | IST → TJM | Jun 27, 08:49 UTC | Jun 28, 06:05 UTC | 21h 15m |
| 2026-06-26 | UTA701 | - | Jun 26, 12:19 UTC | Jun 27, 07:04 UTC | 18h 45m |
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-73089 page for operator, model, and routing details .