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
- 252
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- Jul 26, 19:45 UTC
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 |
|---|---|---|---|
| UAL889 | United Airlines | 10 | 2026-06-26 |
| UAL803 | - | 10 | 2026-07-18 |
| UAL888 | United Airlines | 9 | 2026-06-25 |
| UAL926 | United Airlines | 7 | 2026-06-01 |
| UAL876 | United Airlines | 7 | 2026-07-19 |
| UAL672 | United Airlines | 7 | 2026-07-25 |
| UAL47 | - | 7 | 2026-07-08 |
| UAL160 | - | 7 | 2026-07-05 |
| UAL130 | - | 7 | 2026-07-01 |
| UAL97 | - | 6 | 2026-07-14 |
| UAL96 | - | 6 | 2026-07-13 |
| UAL506 | - | 6 | 2026-06-27 |
| UAL5 | - | 6 | 2026-06-15 |
| UAL44 | United Airlines | 6 | 2026-06-08 |
| UAL943 | United Airlines | 5 | 2026-06-17 |
| UAL942 | - | 5 | 2026-06-17 |
| UAL927 | United Airlines | 5 | 2026-06-01 |
| UAL875 | - | 5 | 2026-07-14 |
| UAL673 | United Airlines | 5 | 2026-07-25 |
| UAL59 | United Airlines | 5 | 2026-07-24 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | UAL917 | SFO → AKL | Jul 26, 06:56 UTC | Jul 26, 19:29 UTC | 12h 33m |
| 2026-07-26 | UAL917 | SFO → AKL | Jul 26, 07:05 UTC | Jul 26, 19:45 UTC | 12h 40m |
| 2026-07-25 | UAL673 | SFO → BOS | Jul 25, 15:20 UTC | Jul 26, 03:10 UTC | 11h 50m |
| 2026-07-25 | UAL672 | EWR → ATL | Jul 25, 02:44 UTC | Jul 25, 12:30 UTC | 9h 46m |
| 2026-07-25 | UAL672 | EWR → ATL | Jul 25, 02:10 UTC | Jul 25, 12:40 UTC | 10h 30m |
| 2026-07-24 | UAL59 | FRA → SFO | Jul 24, 11:15 UTC | Jul 24, 22:15 UTC | 11h 0m |
| 2026-07-23 | UAL58 | SFO → FRA | Jul 23, 22:25 UTC | Jul 24, 08:05 UTC | 9h 40m |
| 2026-07-23 | UAL1593 | LGA → DEN | Jul 23, 14:40 UTC | Jul 23, 19:55 UTC | 5h 15m |
| 2026-07-20 | UAL1141 | HNL → SFO | Jul 20, 06:05 UTC | Jul 20, 10:35 UTC | 4h 30m |
| 2026-07-19 | UAL876 | HND → SFO | Jul 19, 10:10 UTC | Jul 19, 19:50 UTC | 9h 40m |
| 2026-07-18 | UAL803 | IAD → HND | Jul 18, 18:10 UTC | Jul 19, 08:00 UTC | 13h 50m |
| 2026-07-17 | UAL885 | - | Jul 17, 08:54 UTC | Jul 17, 17:40 UTC | 8h 45m |
| 2026-07-17 | UAL885 | FCO → IAD | Jul 17, 08:47 UTC | Jul 17, 17:43 UTC | 8h 56m |
| 2026-07-16 | UAL884 | IAD → FCO | Jul 16, 22:45 UTC | Jul 17, 06:40 UTC | 7h 55m |
| 2026-07-16 | UAL885 | - | Jul 16, 10:35 UTC | Jul 16, 13:34 UTC | 3h 0m |
| 2026-07-16 | UAL885 | FCO → IAD | Jul 16, 09:47 UTC | Jul 16, 19:32 UTC | 9h 45m |
| 2026-07-15 | UAL884 | IAD → FCO | Jul 15, 23:25 UTC | Jul 16, 07:40 UTC | 8h 15m |
| 2026-07-15 | UAL804 | HND → IAD | Jul 15, 07:10 UTC | Jul 15, 19:00 UTC | 11h 50m |
| 2026-07-14 | UAL875 | SFO → HND | Jul 14, 18:25 UTC | Jul 15, 04:04 UTC | 9h 39m |
| 2026-07-14 | UAL875 | - | Jul 14, 18:25 UTC | Jul 14, 18:55 UTC | 30m |
| 2026-07-14 | UAL97 | - | Jul 14, 01:05 UTC | Jul 14, 13:45 UTC | 12h 40m |
| 2026-07-13 | UAL96 | SFO → BNE | Jul 13, 07:11 UTC | Jul 13, 21:06 UTC | 13h 55m |
| 2026-07-13 | UAL96 | - | Jul 13, 07:45 UTC | Jul 13, 20:30 UTC | 12h 45m |
| 2026-07-12 | UAL673 | - | Jul 12, 14:45 UTC | Jul 13, 02:35 UTC | 11h 50m |
| 2026-07-12 | UAL672 | SFO → BCN | Jul 12, 01:29 UTC | Jul 12, 11:47 UTC | 10h 18m |
| 2026-07-12 | UAL672 | - | Jul 12, 01:10 UTC | Jul 12, 10:30 UTC | 9h 20m |
| 2026-07-11 | UAL195 | - | Jul 11, 10:10 UTC | Jul 11, 21:40 UTC | 11h 30m |
| 2026-07-11 | UAL195 | MUC → SFO | Jul 11, 10:02 UTC | Jul 11, 21:38 UTC | 11h 36m |
| 2026-07-10 | UAL102 | - | Jul 10, 22:15 UTC | Jul 11, 07:45 UTC | 9h 30m |
| 2026-07-10 | UAL102 | IAH → MUC | Jul 10, 22:02 UTC | Jul 11, 07:41 UTC | 9h 39m |
| 2026-07-08 | UAL47 | - | Jul 8, 12:30 UTC | Jul 8, 22:50 UTC | 10h 20m |
| 2026-07-08 | UAL46 | - | Jul 8, 00:40 UTC | Jul 8, 10:05 UTC | 9h 25m |
| 2026-07-07 | UAL818 | - | Jul 7, 00:10 UTC | Jul 7, 09:55 UTC | 9h 45m |
| 2026-07-06 | UAL819 | - | Jul 6, 02:40 UTC | Jul 6, 04:55 UTC | 2h 15m |
| 2026-07-06 | UAL819 | IAH → EZE | Jul 6, 02:06 UTC | Jul 6, 11:24 UTC | 9h 18m |
| 2026-07-05 | UAL160 | - | Jul 5, 10:40 UTC | Jul 5, 21:15 UTC | 10h 35m |
| 2026-07-04 | UAL194 | SFO → MUC | Jul 4, 22:00 UTC | Jul 5, 08:30 UTC | 10h 30m |
| 2026-07-04 | UAL984 | - | Jul 4, 07:25 UTC | Jul 4, 18:20 UTC | 10h 55m |
| 2026-07-03 | UAL57 | EWR → CDG | Jul 3, 22:55 UTC | Jul 4, 05:20 UTC | 6h 25m |
| 2026-07-03 | UAL55 | - | Jul 3, 12:25 UTC | Jul 3, 19:55 UTC | 7h 30m |
| 2026-07-03 | UAL54 | EWR → CDG | Jul 3, 02:55 UTC | Jul 3, 09:25 UTC | 6h 30m |
| 2026-07-02 | UAL55 | - | Jul 2, 16:00 UTC | Jul 2, 23:50 UTC | 7h 50m |
| 2026-07-02 | UAL54 | EWR → CDG | Jul 2, 04:15 UTC | Jul 2, 10:40 UTC | 6h 25m |
| 2026-07-01 | UAL130 | HND → EWR | Jul 1, 09:25 UTC | Jul 1, 21:25 UTC | 12h 0m |
| 2026-07-01 | UAL803 | IAD → HND | Jul 1, 05:40 UTC | Jul 1, 06:30 UTC | 50m |
| 2026-06-30 | UAL803 | IAD → HND | Jun 30, 17:10 UTC | Jul 1, 00:25 UTC | 7h 15m |
| 2026-06-29 | UAL804 | HND → IAD | Jun 29, 07:55 UTC | Jun 29, 20:09 UTC | 12h 15m |
| 2026-06-28 | UAL875 | SFO → HND | Jun 28, 18:34 UTC | Jun 29, 05:09 UTC | 10h 35m |
| 2026-06-27 | UAL506 | - | Jun 27, 14:20 UTC | Jun 28, 02:20 UTC | 12h 0m |
| 2026-06-27 | UAL507 | SFO → FCO | Jun 27, 00:25 UTC | Jun 27, 11:39 UTC | 11h 15m |
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 .