sensors Mode-S transponder
A779BB
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N581BC · EMBRAER EMB-505 Phenom 300 · operated by BEAR AIR II LLC
- Hex
- A779BB
- Octal
- 51674673
- Decimal
- 10,975,675
- Country
- US
- Tail
- N581BC
- Type
- E55P
- Flights observed
- 52
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 3d ago
Last known position
Country allocation
The ICAO 24-bit address A779BB falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States 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 1 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| N581BC | - | 52 | 2026-07-10 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-10 | N581BC | - | Jul 10, 20:25 UTC | Jul 10, 22:00 UTC | 1h 35m |
| 2026-07-10 | N581BC | - | Jul 10, 17:40 UTC | Jul 10, 19:30 UTC | 1h 50m |
| 2026-07-08 | N581BC | - | Jul 8, 15:35 UTC | Jul 8, 17:35 UTC | 2h 0m |
| 2026-07-08 | N581BC | - | Jul 8, 13:05 UTC | Jul 8, 14:35 UTC | 1h 30m |
| 2026-07-07 | N581BC | - | Jul 7, 16:00 UTC | Jul 7, 17:55 UTC | 1h 55m |
| 2026-07-07 | N581BC | - | Jul 7, 12:35 UTC | Jul 7, 14:50 UTC | 2h 15m |
| 2026-07-01 | N581BC | - | Jul 1, 19:45 UTC | Jul 1, 21:10 UTC | 1h 25m |
| 2026-07-01 | N581BC | - | Jul 1, 15:55 UTC | Jul 1, 17:25 UTC | 1h 30m |
| 2026-07-01 | N581BC | - | Jul 1, 02:30 UTC | Jul 1, 03:15 UTC | 45m |
| 2026-06-30 | N581BC | - | Jun 30, 15:10 UTC | Jun 30, 15:55 UTC | 45m |
| 2026-06-29 | N581BC | - | Jun 29, 18:55 UTC | Jun 29, 20:04 UTC | 1h 10m |
| 2026-06-29 | N581BC | - | Jun 29, 16:35 UTC | Jun 29, 17:59 UTC | 1h 25m |
| 2026-06-29 | N581BC | - | Jun 29, 13:14 UTC | Jun 29, 14:44 UTC | 1h 30m |
| 2026-06-23 | N581BC | - | Jun 23, 18:04 UTC | Jun 23, 19:10 UTC | 1h 5m |
| 2026-06-23 | N581BC | - | Jun 23, 16:35 UTC | Jun 23, 17:34 UTC | 1h 0m |
| 2026-06-22 | N581BC | - | Jun 22, 21:35 UTC | Jun 22, 22:19 UTC | 45m |
| 2026-06-22 | N581BC | - | Jun 22, 16:20 UTC | Jun 22, 17:15 UTC | 55m |
| 2026-06-18 | N581BC | - | Jun 18, 18:30 UTC | Jun 18, 19:45 UTC | 1h 15m |
| 2026-06-18 | N581BC | - | Jun 18, 12:05 UTC | Jun 18, 13:45 UTC | 1h 40m |
| 2026-06-17 | N581BC | - | Jun 17, 19:35 UTC | Jun 17, 21:50 UTC | 2h 15m |
| 2026-06-17 | N581BC | - | Jun 17, 15:50 UTC | Jun 17, 17:55 UTC | 2h 5m |
| 2026-06-14 | N581BC | - | Jun 14, 14:25 UTC | Jun 14, 16:40 UTC | 2h 15m |
| 2026-06-13 | N581BC | - | Jun 13, 14:10 UTC | Jun 13, 17:00 UTC | 2h 50m |
| 2026-06-12 | N581BC | - | Jun 12, 15:00 UTC | Jun 12, 18:40 UTC | 3h 40m |
| 2026-06-12 | N581BC | - | Jun 12, 13:40 UTC | Jun 12, 14:30 UTC | 50m |
| 2026-06-12 | N581BC | - | Jun 12, 00:40 UTC | Jun 12, 01:35 UTC | 55m |
| 2026-06-11 | N581BC | - | Jun 11, 16:15 UTC | Jun 11, 17:05 UTC | 50m |
| 2026-06-10 | N581BC | - | Jun 10, 15:55 UTC | Jun 10, 16:40 UTC | 45m |
| 2026-06-10 | N581BC | - | Jun 10, 13:25 UTC | Jun 10, 15:05 UTC | 1h 40m |
| 2026-06-10 | N581BC | - | Jun 10, 10:35 UTC | Jun 10, 12:00 UTC | 1h 25m |
| 2026-06-09 | N581BC | - | Jun 9, 19:50 UTC | Jun 9, 20:15 UTC | 25m |
| 2026-06-09 | N581BC | - | Jun 9, 14:40 UTC | Jun 9, 15:25 UTC | 45m |
| 2026-06-03 | N581BC | - | Jun 3, 19:05 UTC | Jun 3, 20:15 UTC | 1h 10m |
| 2026-06-03 | N581BC | - | Jun 3, 11:20 UTC | Jun 3, 12:40 UTC | 1h 20m |
| 2026-05-26 | N581BC | - | May 26, 19:45 UTC | May 26, 21:34 UTC | 1h 50m |
| 2026-05-25 | N581BC | - | May 25, 11:25 UTC | May 25, 13:15 UTC | 1h 50m |
| 2026-05-19 | N581BC | - | May 19, 19:55 UTC | May 19, 21:15 UTC | 1h 20m |
| 2026-05-19 | N581BC | - | May 19, 14:40 UTC | May 19, 16:10 UTC | 1h 30m |
| 2026-05-14 | N581BC | - | May 14, 01:05 UTC | May 14, 01:50 UTC | 45m |
| 2026-05-13 | N581BC | - | May 13, 20:50 UTC | May 13, 21:30 UTC | 40m |
| 2026-05-07 | N581BC | - | May 7, 19:45 UTC | May 7, 20:45 UTC | 1h 0m |
| 2026-05-07 | N581BC | - | May 7, 13:20 UTC | May 7, 14:20 UTC | 1h 0m |
| 2026-04-29 | N581BC | - | Apr 29, 18:25 UTC | Apr 29, 20:50 UTC | 2h 25m |
| 2026-04-26 | N581BC | - | Apr 26, 16:25 UTC | Apr 26, 20:05 UTC | 3h 40m |
| 2026-04-24 | N581BC | - | Apr 24, 18:55 UTC | Apr 24, 21:10 UTC | 2h 15m |
| 2026-04-24 | N581BC | - | Apr 24, 15:10 UTC | Apr 24, 17:15 UTC | 2h 5m |
| 2026-04-22 | N581BC | - | Apr 22, 20:00 UTC | Apr 22, 20:50 UTC | 50m |
| 2026-04-22 | N581BC | - | Apr 22, 12:10 UTC | Apr 22, 13:00 UTC | 50m |
| 2026-04-16 | N581BC | - | Apr 16, 18:15 UTC | Apr 16, 19:10 UTC | 55m |
| 2026-04-15 | N581BC | - | Apr 15, 21:15 UTC | Apr 15, 22:15 UTC | 1h 0m |
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 N581BC page for operator, model, and routing details .