sensors Mode-S transponder
151DA1
ICAO 24-bit transponder address · allocated to Russia
Currently assigned to RA-73121 · BOEING 737-800
- Hex
- 151DA1
- Octal
- 05216641
- Decimal
- 1,383,841
- Country
- RU
- Tail
- RA-73121
- Type
- B738
- Flights observed
- 213
- Distinct callsigns
- 20
- Country
- RU
- Last broadcast
- Jul 26, 21:05 UTC
Current position
Country allocation
The ICAO 24-bit address 151DA1 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 |
|---|---|---|---|
| AFL905 | Aeroflot Russian Airlines | 14 | 2026-07-26 |
| AFL901 | Aeroflot Russian Airlines | 11 | 2026-07-25 |
| AFL909 | Aeroflot Russian Airlines | 8 | 2026-05-21 |
| AFL2149 | - | 7 | 2026-06-24 |
| AFL2122 | - | 7 | 2026-07-04 |
| AFL913 | Aeroflot Russian Airlines | 6 | 2026-05-24 |
| AFL912 | Aeroflot Russian Airlines | 6 | 2026-05-24 |
| AFL904 | Aeroflot Russian Airlines | 6 | 2026-07-23 |
| AFL2146 | Aeroflot Russian Airlines | 6 | 2026-05-25 |
| AFL2124 | - | 6 | 2026-07-06 |
| AFL2123 | - | 6 | 2026-07-04 |
| AFL2121 | - | 6 | 2026-07-11 |
| AFL900 | Aeroflot Russian Airlines | 5 | 2026-07-24 |
| AFL802 | - | 5 | 2026-07-17 |
| AFL429 | Aeroflot Russian Airlines | 5 | 2026-07-20 |
| AFL422 | Aeroflot Russian Airlines | 5 | 2026-06-02 |
| AFL2148 | Aeroflot Russian Airlines | 5 | 2026-06-11 |
| AFL2129 | - | 5 | 2026-07-16 |
| AFL1865 | Aeroflot Russian Airlines | 5 | 2026-06-12 |
| AFL803 | - | 4 | 2026-07-18 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | AFL905 | HRG → SVX | Jul 26, 05:05 UTC | Jul 26, 21:05 UTC | 16h 1m |
| 2026-07-25 | AFL901 | SSH → SVX | Jul 25, 10:20 UTC | Jul 26, 07:35 UTC | 21h 16m |
| 2026-07-25 | AFL901 | SSH → SVX | Jul 25, 09:15 UTC | Jul 26, 07:35 UTC | 22h 21m |
| 2026-07-24 | AFL900 | SVX → SSH | Jul 24, 12:30 UTC | Jul 25, 06:50 UTC | 18h 20m |
| 2026-07-24 | AFL905 | HRG → SVX | Jul 24, 11:05 UTC | Jul 25, 06:50 UTC | 19h 45m |
| 2026-07-24 | AFL905 | HRG → SVX | Jul 24, 08:20 UTC | Jul 25, 06:50 UTC | 22h 30m |
| 2026-07-24 | AFL905 | HRG → SVX | Jul 24, 06:45 UTC | Jul 25, 06:15 UTC | 23h 30m |
| 2026-07-24 | AFL905 | HRG → SVX | Jul 24, 06:10 UTC | Jul 24, 13:30 UTC | 7h 20m |
| 2026-07-23 | AFL904 | SVX → HRG | Jul 23, 10:20 UTC | Jul 24, 08:20 UTC | 22h 0m |
| 2026-07-23 | AFL901 | SSH → SVX | Jul 23, 09:05 UTC | Jul 24, 08:15 UTC | 23h 10m |
| 2026-07-23 | AFL901 | SSH → SVX | Jul 23, 06:20 UTC | Jul 24, 06:10 UTC | 23h 50m |
| 2026-07-23 | AFL901 | SSH → SVX | Jul 23, 05:15 UTC | Jul 23, 11:55 UTC | 6h 40m |
| 2026-07-22 | AFL900 | SVX → SSH | Jul 22, 10:20 UTC | Jul 23, 10:15 UTC | 23h 55m |
| 2026-07-22 | AFL905 | HRG → SVX | Jul 22, 05:10 UTC | Jul 22, 12:00 UTC | 6h 50m |
| 2026-07-21 | AFL901 | - | Jul 21, 10:40 UTC | Jul 22, 05:25 UTC | 18h 45m |
| 2026-07-21 | AFL901 | - | Jul 21, 09:00 UTC | Jul 22, 05:25 UTC | 20h 25m |
| 2026-07-21 | AFL900 | SVX → SSH | Jul 21, 04:40 UTC | Jul 21, 06:50 UTC | 2h 10m |
| 2026-07-20 | AFL429 | SSH → SVO | Jul 20, 12:35 UTC | Jul 20, 13:05 UTC | 30m |
| 2026-07-20 | AFL429 | SSH → SVO | Jul 20, 03:45 UTC | Jul 20, 10:15 UTC | 6h 30m |
| 2026-07-19 | AFL429 | SSH → SVO | Jul 19, 12:20 UTC | Jul 20, 10:15 UTC | 21h 55m |
| 2026-07-19 | AFL429 | SSH → SVO | Jul 19, 11:25 UTC | Jul 20, 10:15 UTC | 22h 50m |
| 2026-07-18 | AFL803 | - | Jul 18, 14:20 UTC | Jul 19, 09:45 UTC | 19h 25m |
| 2026-07-18 | AFL803 | - | Jul 18, 13:25 UTC | Jul 19, 09:45 UTC | 20h 20m |
| 2026-07-18 | AFL676 | - | Jul 18, 11:15 UTC | Jul 18, 11:45 UTC | 30m |
| 2026-07-18 | AFL677 | - | Jul 18, 06:05 UTC | Jul 18, 07:30 UTC | 1h 25m |
| 2026-07-17 | AFL802 | - | Jul 17, 08:20 UTC | Jul 18, 04:10 UTC | 19h 51m |
| 2026-07-17 | AFL429 | SSH → SVO | Jul 17, 07:14 UTC | Jul 18, 04:10 UTC | 20h 56m |
| 2026-07-17 | AFL428 | - | Jul 17, 03:59 UTC | Jul 17, 05:25 UTC | 1h 25m |
| 2026-07-16 | AFL2157 | - | Jul 16, 16:19 UTC | Jul 16, 18:05 UTC | 1h 45m |
| 2026-07-16 | AFL2129 | - | Jul 16, 03:50 UTC | Jul 16, 15:05 UTC | 11h 15m |
| 2026-07-16 | AFL2128 | - | Jul 16, 02:00 UTC | Jul 16, 02:35 UTC | 35m |
| 2026-07-12 | AFL2161 | - | Jul 12, 19:45 UTC | Jul 12, 20:05 UTC | 20m |
| 2026-07-12 | AFL2160 | - | Jul 12, 01:25 UTC | Jul 12, 18:01 UTC | 16h 35m |
| 2026-07-11 | AFL2132 | SVO → SVO | Jul 11, 18:55 UTC | Jul 11, 19:20 UTC | 25m |
| 2026-07-11 | AFL2121 | - | Jul 11, 11:25 UTC | Jul 11, 12:00 UTC | 35m |
| 2026-07-11 | AFL2120 | - | Jul 11, 08:05 UTC | Jul 11, 10:00 UTC | 1h 55m |
| 2026-07-08 | AFL2159 | - | Jul 8, 15:25 UTC | Jul 8, 17:10 UTC | 1h 45m |
| 2026-07-08 | AFL2158 | - | Jul 8, 03:25 UTC | Jul 8, 13:30 UTC | 10h 5m |
| 2026-07-07 | AFL2127 | - | Jul 7, 14:45 UTC | Jul 7, 16:30 UTC | 1h 45m |
| 2026-07-07 | AFL2126 | - | Jul 7, 12:55 UTC | Jul 7, 13:30 UTC | 35m |
| 2026-07-06 | AFL2126 | - | Jul 6, 14:20 UTC | Jul 7, 13:30 UTC | 23h 10m |
| 2026-07-06 | AFL2125 | - | Jul 6, 13:15 UTC | Jul 6, 14:50 UTC | 1h 35m |
| 2026-07-06 | AFL2124 | - | Jul 6, 09:05 UTC | Jul 6, 11:30 UTC | 2h 25m |
| 2026-07-06 | AFL2124 | SVO → SVO | Jul 6, 06:40 UTC | Jul 6, 07:05 UTC | 25m |
| 2026-07-05 | AFL1867 | - | Jul 5, 11:40 UTC | Jul 5, 12:10 UTC | 30m |
| 2026-07-05 | AFL1866 | SVO → EVN | Jul 5, 06:55 UTC | Jul 5, 07:25 UTC | 30m |
| 2026-07-04 | AFL2123 | - | Jul 4, 14:45 UTC | Jul 4, 16:45 UTC | 2h 0m |
| 2026-07-04 | AFL2122 | - | Jul 4, 11:30 UTC | Jul 4, 13:10 UTC | 1h 40m |
| 2026-07-03 | AFL2122 | - | Jul 3, 16:20 UTC | Jul 4, 13:10 UTC | 20h 50m |
| 2026-07-03 | AFL2159 | - | Jul 3, 15:30 UTC | Jul 4, 13:10 UTC | 21h 40m |
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-73121 page for operator, model, and routing details .