- Flights observed
- 29
- Distinct callsigns
- 14
- Country
- US
- Last broadcast
- Jul 26, 16:45 UTC
Last known position
Country allocation
The ICAO 24-bit address AB0F8B 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 14 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| UAL1 | United Airlines | 4 | 2026-07-25 |
| BOE787 | - | 4 | 2026-06-23 |
| UAL901 | United Airlines | 3 | 2026-07-23 |
| UAL900 | United Airlines | 3 | 2026-07-24 |
| UAL2 | United Airlines | 3 | 2026-07-26 |
| UAL2445 | - | 2 | 2026-07-12 |
| UAL1981 | - | 2 | 2026-07-12 |
| UAL1095 | United Airlines | 2 | 2026-07-20 |
| UAL949 | - | 1 | 2026-07-15 |
| UAL923 | - | 1 | 2026-07-15 |
| UAL4210 | United Airlines | 1 | 2026-06-27 |
| UAL3903 | - | 1 | 2026-07-11 |
| UAL336 | United Airlines | 1 | 2026-07-20 |
| UAL212 | - | 1 | 2026-07-13 |
Recent flights last 29
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | UAL2 | SIN → SFO | Jul 26, 02:50 UTC | Jul 26, 16:35 UTC | 13h 46m |
| 2026-07-26 | UAL2 | SIN → SFO | Jul 26, 01:30 UTC | Jul 26, 01:40 UTC | 10m |
| 2026-07-25 | UAL1 | SFO → SIN | Jul 25, 21:55 UTC | Jul 25, 22:05 UTC | 10m |
| 2026-07-25 | UAL1 | SFO → SIN | Jul 25, 06:21 UTC | Jul 25, 22:01 UTC | 15h 40m |
| 2026-07-25 | UAL1 | SFO → SIN | Jul 25, 06:35 UTC | Jul 25, 20:45 UTC | 14h 10m |
| 2026-07-24 | UAL900 | LHR → SFO | Jul 24, 10:10 UTC | Jul 24, 10:45 UTC | 35m |
| 2026-07-24 | UAL900 | LHR → SFO | Jul 24, 10:10 UTC | Jul 24, 20:27 UTC | 10h 17m |
| 2026-07-23 | UAL901 | SFO → LHR | Jul 23, 20:27 UTC | Jul 24, 05:41 UTC | 9h 14m |
| 2026-07-23 | UAL901 | SFO → LHR | Jul 23, 20:25 UTC | Jul 24, 05:45 UTC | 9h 20m |
| 2026-07-20 | UAL1095 | MYR → EWR | Jul 20, 12:30 UTC | Jul 20, 17:05 UTC | 4h 35m |
| 2026-07-20 | UAL336 | SFO → EWR | Jul 20, 02:15 UTC | Jul 20, 06:30 UTC | 4h 15m |
| 2026-07-18 | UAL900 | LHR → SFO | Jul 18, 10:15 UTC | Jul 18, 20:30 UTC | 10h 15m |
| 2026-07-17 | UAL901 | SFO → LHR | Jul 17, 20:44 UTC | Jul 18, 06:15 UTC | 9h 31m |
| 2026-07-17 | UAL2 | - | Jul 17, 01:05 UTC | Jul 17, 16:15 UTC | 15h 10m |
| 2026-07-16 | UAL1 | - | Jul 16, 07:00 UTC | Jul 16, 20:55 UTC | 13h 55m |
| 2026-07-15 | UAL949 | - | Jul 15, 13:30 UTC | Jul 15, 23:40 UTC | 10h 10m |
| 2026-07-15 | UAL923 | - | Jul 15, 01:05 UTC | Jul 15, 11:10 UTC | 10h 5m |
| 2026-07-13 | UAL212 | - | Jul 13, 16:20 UTC | Jul 13, 20:45 UTC | 4h 25m |
| 2026-07-12 | UAL1981 | - | Jul 12, 18:35 UTC | Jul 12, 23:20 UTC | 4h 45m |
| 2026-07-12 | UAL2445 | EWR → LAX | Jul 12, 11:35 UTC | Jul 12, 16:05 UTC | 4h 30m |
| 2026-07-12 | UAL2445 | - | Jul 12, 11:30 UTC | Jul 12, 16:10 UTC | 4h 40m |
| 2026-07-11 | UAL1981 | - | Jul 11, 22:35 UTC | Jul 12, 03:10 UTC | 4h 35m |
| 2026-07-11 | UAL3903 | SFO → LAX | Jul 11, 20:05 UTC | Jul 11, 21:00 UTC | 55m |
| 2026-07-10 | UAL1095 | - | Jul 10, 10:45 UTC | Jul 10, 15:35 UTC | 4h 50m |
| 2026-06-27 | UAL4210 | VCV → CLE | Jun 27, 15:45 UTC | Jun 27, 16:44 UTC | 1h 0m |
| 2026-06-23 | BOE787 | - | Jun 23, 20:34 UTC | Jun 23, 20:54 UTC | 20m |
| 2026-06-23 | BOE787 | - | Jun 23, 18:29 UTC | Jun 23, 20:04 UTC | 1h 35m |
| 2026-06-16 | BOE787 | - | Jun 16, 16:30 UTC | Jun 16, 16:50 UTC | 20m |
| 2026-06-16 | BOE787 | - | Jun 16, 13:44 UTC | Jun 16, 15:50 UTC | 2h 5m |
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 N81107 page for operator, model, and routing details .