sensors Mode-S transponder
AABA9A
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N79011 · BOEING 777-200 · operated by UNITED AIRLINES INC
- Hex
- AABA9A
- Octal
- 52535232
- Decimal
- 11,188,890
- Country
- US
- Tail
- N79011
- Type
- B772
- Flights observed
- 134
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 2h ago
Last known position
Country allocation
The ICAO 24-bit address AABA9A 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 20 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| UAL803 | United Airlines | 7 | 2026-04-30 |
| UAL926 | United Airlines | 6 | 2026-05-06 |
| UAL130 | United Airlines | 6 | 2026-05-01 |
| UAL97 | United Airlines | 5 | 2026-05-26 |
| UAL888 | United Airlines | 5 | 2026-05-29 |
| UAL5 | United Airlines | 5 | 2026-04-15 |
| UAL47 | United Airlines | 5 | 2026-04-14 |
| UAL160 | - | 5 | 2026-04-13 |
| UAL96 | United Airlines | 4 | 2026-05-25 |
| UAL889 | United Airlines | 4 | 2026-05-27 |
| UAL59 | United Airlines | 4 | 2026-05-14 |
| UAL58 | United Airlines | 4 | 2026-05-13 |
| UAL44 | United Airlines | 4 | 2026-05-20 |
| UAL948 | United Airlines | 3 | 2026-05-28 |
| UAL927 | United Airlines | 3 | 2026-05-06 |
| UAL925 | United Airlines | 3 | 2026-04-15 |
| UAL876 | United Airlines | 3 | 2026-05-13 |
| UAL673 | United Airlines | 3 | 2026-05-15 |
| UAL672 | United Airlines | 3 | 2026-05-15 |
| UAL45 | United Airlines | 3 | 2026-05-21 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | UAL888 | SFO → PEK | May 29, 18:25 UTC | May 30, 08:04 UTC | 13h 39m |
| 2026-05-29 | UAL888 | SFO → PEK | May 29, 18:30 UTC | May 30, 06:30 UTC | 12h 0m |
| 2026-05-28 | UAL949 | LHR → SFO | May 28, 12:25 UTC | May 28, 14:30 UTC | 2h 5m |
| 2026-05-28 | UAL949 | LHR → SFO | May 28, 12:25 UTC | May 28, 22:38 UTC | 10h 13m |
| 2026-05-28 | UAL948 | SFO → LHR | May 28, 00:10 UTC | May 28, 10:15 UTC | 10h 5m |
| 2026-05-27 | UAL889 | PEK → SFO | May 27, 10:35 UTC | May 27, 21:00 UTC | 10h 25m |
| 2026-05-26 | UAL888 | SFO → PEK | May 26, 18:24 UTC | May 27, 06:20 UTC | 11h 55m |
| 2026-05-26 | UAL97 | BNE → SFO | May 26, 00:54 UTC | May 26, 09:04 UTC | 8h 10m |
| 2026-05-26 | UAL97 | BNE → SFO | May 26, 00:48 UTC | May 26, 13:26 UTC | 12h 38m |
| 2026-05-25 | UAL96 | SFO → BNE | May 25, 06:56 UTC | May 25, 20:08 UTC | 13h 12m |
| 2026-05-25 | UAL96 | SFO → BNE | May 25, 06:55 UTC | May 25, 11:25 UTC | 4h 30m |
| 2026-05-24 | UAL506 | MSN → DEN | May 24, 14:20 UTC | May 24, 14:30 UTC | 10m |
| 2026-05-24 | UAL506 | MSN → DEN | May 24, 14:07 UTC | May 25, 02:27 UTC | 12h 20m |
| 2026-05-24 | UAL507 | DEN → LGA | May 24, 00:25 UTC | May 24, 11:40 UTC | 11h 15m |
| 2026-05-23 | UAL889 | PEK → SFO | May 23, 10:55 UTC | May 23, 12:25 UTC | 1h 30m |
| 2026-05-23 | UAL889 | PEK → SFO | May 23, 09:56 UTC | May 23, 21:00 UTC | 11h 4m |
| 2026-05-23 | UAL889 | PEK → SFO | May 23, 09:56 UTC | May 23, 20:52 UTC | 10h 56m |
| 2026-05-22 | UAL888 | SFO → PEK | May 22, 18:30 UTC | May 22, 19:00 UTC | 30m |
| 2026-05-22 | UAL888 | SFO → PEK | May 22, 18:15 UTC | May 23, 07:44 UTC | 13h 29m |
| 2026-05-21 | UAL45 | ZRH → SFO | May 21, 12:30 UTC | May 21, 23:50 UTC | 11h 20m |
| 2026-05-20 | UAL44 | SFO → ZRH | May 20, 20:42 UTC | May 21, 07:17 UTC | 10h 35m |
| 2026-05-20 | UAL44 | SFO → ZRH | May 20, 20:50 UTC | May 21, 07:15 UTC | 10h 25m |
| 2026-05-20 | UAL1777 | EWR → IAH | May 20, 12:15 UTC | May 20, 17:45 UTC | 5h 30m |
| 2026-05-20 | UAL2397 | EWR → PDX | May 20, 04:15 UTC | May 20, 08:40 UTC | 4h 26m |
| 2026-05-19 | UAL2238 | IAH → SFO | May 19, 20:20 UTC | May 20, 01:35 UTC | 5h 15m |
| 2026-05-19 | UAL56 | CDG → EWR | May 19, 09:00 UTC | May 19, 16:20 UTC | 7h 20m |
| 2026-05-19 | UAL56 | CDG → EWR | May 19, 09:09 UTC | May 19, 16:11 UTC | 7h 2m |
| 2026-05-19 | UAL915 | IAD → CDG | May 19, 00:15 UTC | May 19, 07:10 UTC | 6h 55m |
| 2026-05-18 | UAL919 | LHR → IAD | May 18, 11:50 UTC | May 18, 19:05 UTC | 7h 14m |
| 2026-05-18 | UAL948 | SFO → LHR | May 18, 00:20 UTC | May 18, 09:55 UTC | 9h 35m |
| 2026-05-17 | UAL948 | SFO → LHR | May 17, 23:59 UTC | May 18, 09:51 UTC | 9h 52m |
| 2026-05-17 | UAL97 | BNE → SFO | May 17, 00:50 UTC | May 17, 09:05 UTC | 8h 15m |
| 2026-05-17 | UAL97 | BNE → SFO | May 17, 00:43 UTC | May 17, 13:30 UTC | 12h 47m |
| 2026-05-16 | UAL96 | SFO → BNE | May 16, 07:51 UTC | May 16, 21:20 UTC | 13h 29m |
| 2026-05-15 | UAL673 | SFO → BOS | May 15, 14:30 UTC | May 16, 02:15 UTC | 11h 44m |
| 2026-05-15 | UAL672 | EWR → ATL | May 15, 01:19 UTC | May 15, 12:04 UTC | 10h 45m |
| 2026-05-15 | UAL672 | EWR → ATL | May 15, 01:15 UTC | May 15, 04:00 UTC | 2h 45m |
| 2026-05-14 | UAL59 | FRA → SFO | May 14, 11:30 UTC | May 14, 12:30 UTC | 1h 0m |
| 2026-05-14 | UAL59 | FRA → SFO | May 14, 11:29 UTC | May 14, 22:29 UTC | 11h 0m |
| 2026-05-13 | UAL58 | SFO → FRA | May 13, 21:07 UTC | May 14, 07:10 UTC | 10h 3m |
| 2026-05-13 | UAL58 | SFO → FRA | May 13, 21:10 UTC | May 14, 07:20 UTC | 10h 10m |
| 2026-05-13 | UAL876 | HND → SFO | May 13, 07:15 UTC | May 13, 16:25 UTC | 9h 10m |
| 2026-05-12 | UAL875 | SFO → HND | May 12, 18:05 UTC | May 13, 04:45 UTC | 10h 40m |
| 2026-05-12 | UAL97 | BNE → SFO | May 12, 13:00 UTC | May 12, 13:30 UTC | 30m |
| 2026-05-11 | UAL96 | SFO → BNE | May 11, 08:30 UTC | May 11, 22:30 UTC | 14h 0m |
| 2026-05-10 | UAL673 | SFO → BOS | May 10, 14:45 UTC | May 11, 02:30 UTC | 11h 45m |
| 2026-05-10 | UAL673 | SFO → BOS | May 10, 14:26 UTC | May 11, 02:30 UTC | 12h 4m |
| 2026-05-10 | UAL672 | EWR → ATL | May 10, 01:00 UTC | May 10, 12:00 UTC | 11h 0m |
| 2026-05-09 | UAL59 | FRA → SFO | May 9, 11:15 UTC | May 9, 12:30 UTC | 1h 15m |
| 2026-05-09 | UAL59 | FRA → SFO | May 9, 11:14 UTC | May 9, 22:14 UTC | 11h 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 N79011 page for operator, model, and routing details .