sensors Mode-S transponder
AADB37
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N799UA · BOEING 777-200 · operated by UNITED AIRLINES INC
- Hex
- AADB37
- Octal
- 52555467
- Decimal
- 11,197,239
- Country
- US
- Tail
- N799UA
- Type
- B772
- Flights observed
- 111
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 1h ago
Current position
Country allocation
The ICAO 24-bit address AADB37 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 |
|---|---|---|---|
| UAL984 | United Airlines | 8 | 2026-05-09 |
| UAL160 | United Airlines | 8 | 2026-05-26 |
| UAL949 | United Airlines | 5 | 2026-04-28 |
| UAL194 | United Airlines | 5 | 2026-05-25 |
| UAL925 | United Airlines | 4 | 2026-05-28 |
| UAL924 | United Airlines | 4 | 2026-04-24 |
| UAL889 | United Airlines | 4 | 2026-05-24 |
| UAL888 | United Airlines | 4 | 2026-05-23 |
| UAL852 | United Airlines | 4 | 2026-05-19 |
| UAL57 | United Airlines | 4 | 2026-05-08 |
| UAL130 | United Airlines | 4 | 2026-04-14 |
| UAL838 | United Airlines | 3 | 2026-04-30 |
| UAL45 | United Airlines | 3 | 2026-05-20 |
| UAL44 | United Airlines | 3 | 2026-05-19 |
| UAL1726 | United Airlines | 3 | 2026-04-13 |
| UAL131 | United Airlines | 3 | 2026-04-13 |
| UAL969 | United Airlines | 2 | 2026-05-01 |
| UAL948 | United Airlines | 2 | 2026-04-28 |
| UAL939 | United Airlines | 2 | 2026-05-15 |
| UAL930 | United Airlines | 2 | 2026-05-15 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | UAL803 | IAD → HND | May 29, 17:25 UTC | May 29, 23:45 UTC | 6h 20m |
| 2026-05-28 | UAL925 | LHR → IAD | May 28, 16:40 UTC | May 28, 23:50 UTC | 7h 10m |
| 2026-05-28 | UAL5 | IAH → LHR | May 28, 02:15 UTC | May 28, 11:30 UTC | 9h 15m |
| 2026-05-27 | UAL47 | FRA → IAH | May 27, 13:15 UTC | May 27, 23:25 UTC | 10h 10m |
| 2026-05-27 | UAL46 | IAH → FRA | May 27, 00:25 UTC | May 27, 09:25 UTC | 9h 1m |
| 2026-05-26 | UAL160 | MUC → IAH | May 26, 10:34 UTC | May 26, 19:45 UTC | 9h 10m |
| 2026-05-26 | UAL160 | MUC → IAH | May 26, 10:39 UTC | May 26, 21:09 UTC | 10h 30m |
| 2026-05-25 | UAL194 | SFO → MUC | May 25, 21:30 UTC | May 26, 07:55 UTC | 10h 25m |
| 2026-05-24 | UAL889 | PEK → SFO | May 24, 11:55 UTC | May 24, 13:45 UTC | 1h 50m |
| 2026-05-24 | UAL889 | PEK → SFO | May 24, 04:05 UTC | May 24, 21:50 UTC | 17h 45m |
| 2026-05-23 | UAL888 | SFO → PEK | May 23, 22:00 UTC | May 24, 21:45 UTC | 23h 45m |
| 2026-05-23 | UAL888 | SFO → PEK | May 23, 18:15 UTC | May 24, 07:36 UTC | 13h 21m |
| 2026-05-23 | UAL888 | SFO → PEK | May 23, 18:15 UTC | May 23, 23:40 UTC | 5h 25m |
| 2026-05-22 | UAL1777 | EWR → IAH | May 22, 12:57 UTC | May 22, 18:38 UTC | 5h 41m |
| 2026-05-22 | UAL1777 | EWR → IAH | May 22, 13:10 UTC | May 22, 18:50 UTC | 5h 40m |
| 2026-05-22 | UAL8141 | SAN → EWR | May 22, 05:55 UTC | May 22, 10:25 UTC | 4h 30m |
| 2026-05-21 | UAL927 | FRA → SFO | May 21, 16:01 UTC | May 21, 19:00 UTC | 3h 0m |
| 2026-05-21 | UAL927 | FRA → SFO | May 21, 15:51 UTC | May 22, 02:44 UTC | 10h 53m |
| 2026-05-21 | UAL926 | SFO → FRA | May 21, 02:40 UTC | May 21, 13:10 UTC | 10h 30m |
| 2026-05-20 | UAL45 | ZRH → SFO | May 20, 12:07 UTC | May 20, 22:51 UTC | 10h 44m |
| 2026-05-20 | UAL45 | ZRH → SFO | May 20, 12:05 UTC | May 20, 22:55 UTC | 10h 50m |
| 2026-05-19 | UAL44 | SFO → ZRH | May 19, 20:55 UTC | May 20, 07:25 UTC | 10h 31m |
| 2026-05-19 | UAL852 | TPE → SAN | May 19, 08:05 UTC | May 19, 17:40 UTC | 9h 35m |
| 2026-05-19 | UAL852 | TPE → SAN | May 19, 06:35 UTC | May 19, 06:50 UTC | 15m |
| 2026-05-18 | UAL853 | SFO → TPE | May 18, 07:00 UTC | May 18, 20:00 UTC | 12h 59m |
| 2026-05-17 | UAL889 | PEK → SFO | May 17, 10:40 UTC | May 17, 20:35 UTC | 9h 55m |
| 2026-05-17 | UAL889 | PEK → SFO | May 17, 09:45 UTC | May 17, 09:55 UTC | 10m |
| 2026-05-16 | UAL888 | SFO → PEK | May 16, 17:45 UTC | May 17, 05:50 UTC | 12h 5m |
| 2026-05-15 | UAL939 | LHR → SFO | May 15, 15:25 UTC | May 16, 01:50 UTC | 10h 25m |
| 2026-05-15 | UAL930 | SFO → LHR | May 15, 03:05 UTC | May 15, 12:55 UTC | 9h 50m |
| 2026-05-14 | UAL45 | ZRH → SFO | May 14, 12:05 UTC | May 14, 23:30 UTC | 11h 25m |
| 2026-05-13 | UAL44 | SFO → ZRH | May 13, 20:52 UTC | May 14, 07:20 UTC | 10h 28m |
| 2026-05-13 | UAL44 | SFO → ZRH | May 13, 20:55 UTC | May 13, 23:35 UTC | 2h 40m |
| 2026-05-13 | UAL852 | TPE → SAN | May 13, 07:25 UTC | May 13, 17:55 UTC | 10h 30m |
| 2026-05-13 | UAL852 | TPE → SAN | May 13, 06:45 UTC | May 13, 06:55 UTC | 10m |
| 2026-05-12 | UAL853 | SFO → TPE | May 12, 07:10 UTC | May 12, 19:45 UTC | 12h 35m |
| 2026-05-11 | UAL673 | SFO → BOS | May 11, 14:30 UTC | May 11, 22:35 UTC | 8h 5m |
| 2026-05-11 | UAL672 | EWR → ATL | May 11, 01:25 UTC | May 11, 12:15 UTC | 10h 50m |
| 2026-05-10 | UAL59 | FRA → SFO | May 10, 11:10 UTC | May 10, 22:09 UTC | 11h 0m |
| 2026-05-09 | UAL58 | SFO → FRA | May 9, 21:07 UTC | May 10, 07:05 UTC | 9h 58m |
| 2026-05-09 | UAL58 | SFO → FRA | May 9, 20:55 UTC | May 10, 07:15 UTC | 10h 20m |
| 2026-05-09 | UAL984 | CDG → SFO | May 9, 07:25 UTC | May 9, 18:05 UTC | 10h 40m |
| 2026-05-09 | UAL984 | CDG → SFO | May 9, 07:39 UTC | May 9, 17:49 UTC | 10h 10m |
| 2026-05-08 | UAL57 | EWR → CDG | May 8, 21:45 UTC | May 9, 04:35 UTC | 6h 50m |
| 2026-05-08 | UAL148 | GRU → EWR | May 8, 00:20 UTC | May 8, 09:19 UTC | 9h 0m |
| 2026-05-07 | UAL149 | EWR → GRU | May 7, 01:16 UTC | May 7, 09:48 UTC | 8h 32m |
| 2026-05-07 | UAL149 | EWR → GRU | May 7, 00:55 UTC | May 7, 10:00 UTC | 9h 5m |
| 2026-05-06 | UAL435 | KOA → SFO | May 6, 16:15 UTC | May 6, 21:20 UTC | 5h 5m |
| 2026-05-02 | UAL939 | LHR → SFO | May 2, 15:40 UTC | May 3, 02:20 UTC | 10h 40m |
| 2026-05-02 | UAL930 | SFO → LHR | May 2, 02:55 UTC | May 2, 12:45 UTC | 9h 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 N799UA page for operator, model, and routing details .