sensors Mode-S transponder
151FBD
ICAO 24-bit transponder address · allocated to Russia
Currently assigned to RA-73661 · BOEING 737-800
- Hex
- 151FBD
- Octal
- 05217675
- Decimal
- 1,384,381
- Country
- RU
- Tail
- RA-73661
- Type
- B738
- Flights observed
- 58
- Distinct callsigns
- 20
- Country
- RU
- Last broadcast
- 1d ago
Last known position
Country allocation
The ICAO 24-bit address 151FBD 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 |
|---|---|---|---|
| AUL541 | - | 5 | 2026-05-15 |
| AUL581 | Aeroflot-Nord | 4 | 2026-04-29 |
| AUL572 | Aeroflot-Nord | 4 | 2026-06-01 |
| AUL532 | Aeroflot-Nord | 4 | 2026-05-21 |
| AUL531 | Aeroflot-Nord | 3 | 2026-04-29 |
| AUL513 | Aeroflot-Nord | 3 | 2026-05-08 |
| AUL507 | Aeroflot-Nord | 3 | 2026-06-02 |
| AUL506 | Aeroflot-Nord | 3 | 2026-05-26 |
| AUL505 | Aeroflot-Nord | 3 | 2026-05-29 |
| AUL582 | Aeroflot-Nord | 2 | 2026-05-19 |
| AUL574 | - | 2 | 2026-05-11 |
| AUL533 | Aeroflot-Nord | 2 | 2026-05-08 |
| AUL520 | Aeroflot-Nord | 2 | 2026-05-30 |
| AUL514 | Aeroflot-Nord | 2 | 2026-05-08 |
| AUL591 | Aeroflot-Nord | 1 | 2026-05-18 |
| AUL586 | Aeroflot-Nord | 1 | 2026-05-10 |
| AUL585 | Aeroflot-Nord | 1 | 2026-05-26 |
| AUL571 | Aeroflot-Nord | 1 | 2026-05-27 |
| AUL564 | Aeroflot-Nord | 1 | 2026-05-10 |
| AUL537 | - | 1 | 2026-04-24 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-02 | AUL152 | LED → ARH | Jun 2, 11:25 UTC | Jun 2, 11:50 UTC | 25m |
| 2026-06-02 | AUL508 | MMK → LED | Jun 2, 09:10 UTC | Jun 2, 10:10 UTC | 1h 0m |
| 2026-06-02 | AUL507 | LED → MMK | Jun 2, 06:45 UTC | Jun 2, 07:30 UTC | 45m |
| 2026-06-01 | AUL572 | OVB → LED | Jun 1, 07:30 UTC | Jun 2, 07:00 UTC | 23h 30m |
| 2026-05-31 | AUL572 | OVB → LED | May 31, 23:40 UTC | Jun 1, 07:45 UTC | 8h 5m |
| 2026-05-30 | AUL520 | LED → MMK | May 30, 17:30 UTC | May 30, 22:30 UTC | 5h 0m |
| 2026-05-29 | AUL505 | SVO → SCW | May 29, 20:40 UTC | May 29, 21:50 UTC | 1h 10m |
| 2026-05-29 | AUL150 | LED → SCW | May 29, 10:15 UTC | May 29, 16:55 UTC | 6h 40m |
| 2026-05-29 | AUL507 | LED → MMK | May 29, 01:40 UTC | May 29, 08:40 UTC | 7h 0m |
| 2026-05-28 | AUL572 | OVB → LED | May 28, 01:30 UTC | May 28, 01:40 UTC | 10m |
| 2026-05-27 | AUL571 | LED → OVB | May 27, 20:05 UTC | May 27, 20:20 UTC | 15m |
| 2026-05-26 | AUL585 | LED → KRR | May 26, 20:24 UTC | May 27, 07:05 UTC | 10h 41m |
| 2026-05-26 | AUL506 | KGD → LED | May 26, 12:20 UTC | May 26, 13:10 UTC | 50m |
| 2026-05-26 | AUL505 | SVO → SCW | May 26, 09:35 UTC | May 26, 10:14 UTC | 40m |
| 2026-05-23 | AUL176 | KGD → ARH | May 23, 15:05 UTC | May 23, 16:15 UTC | 1h 10m |
| 2026-05-23 | AUL175 | ARH → ARH | May 23, 13:05 UTC | May 23, 13:40 UTC | 35m |
| 2026-05-21 | AUL532 | KUF → LED | May 21, 11:10 UTC | May 21, 11:25 UTC | 15m |
| 2026-05-19 | AUL582 | KUF → LED | May 19, 14:00 UTC | May 19, 23:45 UTC | 9h 45m |
| 2026-05-18 | AUL591 | LED → UFA | May 18, 00:45 UTC | May 18, 00:55 UTC | 10m |
| 2026-05-16 | AUL529 | MMK → MMK | May 16, 22:50 UTC | May 16, 23:10 UTC | 20m |
| 2026-05-16 | AUL520 | LED → MMK | May 16, 18:10 UTC | May 16, 18:20 UTC | 10m |
| 2026-05-15 | AUL541 | - | May 15, 07:45 UTC | May 15, 15:35 UTC | 7h 49m |
| 2026-05-12 | AUL506 | KGD → LED | May 12, 14:15 UTC | May 12, 15:05 UTC | 50m |
| 2026-05-11 | AUL574 | - | May 11, 19:50 UTC | May 12, 12:30 UTC | 16h 40m |
| 2026-05-11 | AUL574 | - | May 11, 15:45 UTC | May 12, 12:30 UTC | 20h 46m |
| 2026-05-10 | AUL564 | KUF → LED | May 10, 23:29 UTC | May 11, 20:35 UTC | 21h 6m |
| 2026-05-10 | AUL586 | KRR → LED | May 10, 13:19 UTC | May 10, 23:44 UTC | 10h 25m |
| 2026-05-09 | AUL541 | - | May 9, 16:05 UTC | May 10, 13:35 UTC | 21h 30m |
| 2026-05-09 | AUL541 | - | May 9, 03:10 UTC | May 9, 16:25 UTC | 13h 15m |
| 2026-05-08 | AUL533 | LED → KGD | May 8, 17:55 UTC | May 8, 18:35 UTC | 40m |
| 2026-05-08 | AUL514 | VOZ → LED | May 8, 14:15 UTC | May 8, 15:10 UTC | 55m |
| 2026-05-08 | AUL513 | LED → KGD | May 8, 11:25 UTC | May 8, 12:34 UTC | 1h 10m |
| 2026-05-08 | AUL506 | KGD → LED | May 8, 08:49 UTC | May 8, 09:49 UTC | 1h 0m |
| 2026-05-07 | AUL505 | SVO → SCW | May 7, 17:35 UTC | May 8, 07:20 UTC | 13h 45m |
| 2026-05-05 | AUL507 | LED → MMK | May 5, 03:35 UTC | May 5, 09:45 UTC | 6h 10m |
| 2026-05-03 | AUL533 | LED → KGD | May 3, 09:15 UTC | May 3, 21:35 UTC | 12h 20m |
| 2026-05-01 | AUL514 | VOZ → LED | May 1, 13:55 UTC | May 1, 15:15 UTC | 1h 20m |
| 2026-05-01 | AUL513 | LED → KGD | May 1, 11:50 UTC | May 1, 12:25 UTC | 35m |
| 2026-04-30 | AUL513 | LED → KGD | Apr 30, 13:20 UTC | May 1, 12:25 UTC | 23h 5m |
| 2026-04-29 | AUL581 | LED → KUF | Apr 29, 21:45 UTC | Apr 30, 13:20 UTC | 15h 35m |
| 2026-04-29 | AUL531 | LED → KUF | Apr 29, 08:45 UTC | Apr 29, 21:45 UTC | 13h 1m |
| 2026-04-28 | AUL581 | LED → KUF | Apr 28, 12:25 UTC | Apr 29, 08:55 UTC | 20h 30m |
| 2026-04-27 | AUL510 | GOJ → LED | Apr 27, 19:55 UTC | Apr 28, 09:50 UTC | 13h 55m |
| 2026-04-27 | AUL531 | LED → KUF | Apr 27, 08:30 UTC | Apr 27, 09:00 UTC | 30m |
| 2026-04-26 | AUL581 | LED → KUF | Apr 26, 13:25 UTC | Apr 26, 14:25 UTC | 1h 0m |
| 2026-04-26 | AUL532 | KUF → LED | Apr 26, 03:05 UTC | Apr 26, 11:30 UTC | 8h 25m |
| 2026-04-25 | AUL517 | LED → MMK | Apr 25, 12:15 UTC | Apr 26, 11:15 UTC | 23h 0m |
| 2026-04-25 | AUL509 | LED → GOJ | Apr 25, 06:35 UTC | Apr 25, 06:50 UTC | 15m |
| 2026-04-24 | AUL1538 | KZN → LED | Apr 24, 20:55 UTC | Apr 24, 21:10 UTC | 15m |
| 2026-04-24 | AUL537 | - | Apr 24, 16:20 UTC | Apr 24, 17:10 UTC | 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 RA-73661 page for operator, model, and routing details .