sensors Mode-S transponder
A22D7B
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N23983 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC
- Hex
- A22D7B
- Octal
- 50426573
- Decimal
- 10,628,475
- Country
- US
- Tail
- N23983
- Type
- B789
- Flights observed
- 210
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- Jul 26, 17:35 UTC
Last known position
Country allocation
The ICAO 24-bit address A22D7B 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 |
|---|---|---|---|
| UAL152 | - | 18 | 2026-07-16 |
| UAL153 | - | 17 | 2026-07-17 |
| UAL199 | United Airlines | 9 | 2026-07-06 |
| UAL123 | - | 9 | 2026-06-12 |
| UAL83 | - | 7 | 2026-07-13 |
| UAL82 | - | 7 | 2026-07-13 |
| UAL198 | - | 7 | 2026-07-05 |
| UAL713 | United Airlines | 6 | 2026-07-23 |
| UAL2692 | - | 6 | 2026-07-14 |
| UAL1855 | - | 6 | 2026-06-28 |
| UAL122 | United Airlines | 6 | 2026-06-11 |
| UAL187 | - | 5 | 2026-07-02 |
| UAL923 | - | 4 | 2026-06-20 |
| UAL821 | United Airlines | 4 | 2026-07-19 |
| UAL772 | United Airlines | 4 | 2026-06-06 |
| UAL771 | United Airlines | 4 | 2026-06-05 |
| UAL33 | - | 4 | 2026-06-15 |
| UAL32 | - | 4 | 2026-06-14 |
| UAL188 | United Airlines | 4 | 2026-07-02 |
| UAL1321 | United Airlines | 4 | 2026-04-16 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | UAL3934 | FLL → ORD | Jul 26, 16:30 UTC | Jul 26, 17:35 UTC | 1h 5m |
| 2026-07-26 | UAL3934 | FLL → ORD | Jul 26, 16:20 UTC | Jul 26, 17:37 UTC | 1h 17m |
| 2026-07-25 | UAL613 | LOS → IAD | Jul 25, 02:00 UTC | Jul 25, 02:45 UTC | 45m |
| 2026-07-24 | UAL613 | LOS → IAD | Jul 24, 23:15 UTC | Jul 25, 09:56 UTC | 10h 41m |
| 2026-07-24 | UAL613 | LOS → IAD | Jul 24, 13:35 UTC | Jul 25, 10:00 UTC | 20h 25m |
| 2026-07-24 | UAL612 | IAD → LOS | Jul 24, 06:50 UTC | Jul 25, 02:45 UTC | 19h 55m |
| 2026-07-24 | UAL612 | IAD → LOS | Jul 24, 05:48 UTC | Jul 24, 16:51 UTC | 11h 3m |
| 2026-07-24 | UAL3884 | IAD → ORD | Jul 24, 03:00 UTC | Jul 24, 03:45 UTC | 45m |
| 2026-07-23 | UAL713 | ORD → DEL | Jul 23, 18:01 UTC | Jul 23, 22:38 UTC | 4h 37m |
| 2026-07-23 | UAL713 | ORD → DEL | Jul 23, 18:10 UTC | Jul 23, 22:45 UTC | 4h 35m |
| 2026-07-23 | UAL114 | PPT → SFO | Jul 23, 07:10 UTC | Jul 23, 15:00 UTC | 7h 50m |
| 2026-07-22 | UAL115 | SFO → PPT | Jul 22, 21:00 UTC | Jul 23, 04:40 UTC | 7h 40m |
| 2026-07-21 | UAL870 | SYD → SFO | Jul 21, 00:35 UTC | Jul 21, 13:40 UTC | 13h 5m |
| 2026-07-20 | UAL839 | - | Jul 20, 07:15 UTC | Jul 20, 21:30 UTC | 14h 15m |
| 2026-07-19 | UAL821 | SFO → MEX | Jul 19, 14:20 UTC | Jul 20, 03:20 UTC | 13h 0m |
| 2026-07-19 | UAL821 | SFO → MEX | Jul 19, 11:00 UTC | Jul 19, 11:15 UTC | 15m |
| 2026-07-19 | UAL821 | SFO → MEX | Jul 19, 09:00 UTC | Jul 19, 09:10 UTC | 10m |
| 2026-07-19 | UAL821 | SFO → MEX | Jul 19, 09:05 UTC | Jul 19, 11:13 UTC | 2h 8m |
| 2026-07-19 | UAL820 | MEX → SFO | Jul 19, 00:05 UTC | Jul 19, 00:20 UTC | 15m |
| 2026-07-19 | UAL820 | MEX → SFO | Jul 19, 00:01 UTC | Jul 19, 02:11 UTC | 2h 10m |
| 2026-07-17 | UAL153 | - | Jul 17, 02:20 UTC | Jul 17, 02:39 UTC | 20m |
| 2026-07-16 | UAL152 | - | Jul 16, 14:29 UTC | Jul 16, 14:45 UTC | 15m |
| 2026-07-15 | UAL152 | - | Jul 15, 20:25 UTC | Jul 16, 10:00 UTC | 13h 35m |
| 2026-07-14 | UAL2692 | EWR → LAX | Jul 14, 14:34 UTC | Jul 14, 18:42 UTC | 4h 8m |
| 2026-07-14 | UAL2692 | - | Jul 14, 14:20 UTC | Jul 14, 18:45 UTC | 4h 25m |
| 2026-07-13 | UAL83 | - | Jul 13, 19:20 UTC | Jul 14, 02:45 UTC | 7h 25m |
| 2026-07-13 | UAL83 | DEL → EWR | Jul 13, 18:32 UTC | Jul 14, 10:13 UTC | 15h 41m |
| 2026-07-13 | UAL82 | - | Jul 13, 01:55 UTC | Jul 13, 15:55 UTC | 14h 0m |
| 2026-07-12 | UAL713 | SFO → EWR | Jul 12, 17:50 UTC | Jul 12, 22:33 UTC | 4h 43m |
| 2026-07-12 | UAL713 | SFO → EWR | Jul 12, 17:45 UTC | Jul 12, 22:35 UTC | 4h 50m |
| 2026-07-12 | UAL114 | PPT → SFO | Jul 12, 07:30 UTC | Jul 12, 15:09 UTC | 7h 39m |
| 2026-07-12 | UAL114 | - | Jul 12, 07:35 UTC | Jul 12, 15:10 UTC | 7h 35m |
| 2026-07-11 | UAL115 | SFO → PPT | Jul 11, 20:52 UTC | Jul 12, 04:50 UTC | 7h 58m |
| 2026-07-11 | UAL115 | - | Jul 11, 20:50 UTC | Jul 12, 04:55 UTC | 8h 5m |
| 2026-07-11 | UAL61 | MEL → SFO | Jul 11, 01:09 UTC | Jul 11, 14:47 UTC | 13h 38m |
| 2026-07-11 | UAL61 | - | Jul 11, 01:05 UTC | Jul 11, 02:15 UTC | 1h 10m |
| 2026-07-10 | UAL60 | SFO → MEL | Jul 10, 07:35 UTC | Jul 10, 22:25 UTC | 14h 50m |
| 2026-07-09 | UAL28 | - | Jul 9, 16:15 UTC | Jul 10, 04:00 UTC | 11h 45m |
| 2026-07-09 | UAL29 | - | Jul 9, 10:10 UTC | Jul 9, 10:30 UTC | 20m |
| 2026-07-08 | UAL29 | - | Jul 8, 18:50 UTC | Jul 9, 07:20 UTC | 12h 30m |
| 2026-07-08 | UAL870 | - | Jul 8, 00:40 UTC | Jul 8, 13:15 UTC | 12h 35m |
| 2026-07-07 | UAL839 | - | Jul 7, 07:00 UTC | Jul 7, 22:00 UTC | 15h 0m |
| 2026-07-06 | UAL199 | PVG → LAX | Jul 6, 12:31 UTC | Jul 6, 23:41 UTC | 11h 10m |
| 2026-07-06 | UAL199 | PVG → LAX | Jul 6, 06:40 UTC | Jul 6, 23:35 UTC | 16h 55m |
| 2026-07-05 | UAL198 | - | Jul 5, 20:50 UTC | Jul 6, 14:55 UTC | 18h 5m |
| 2026-07-05 | UAL198 | - | Jul 5, 20:40 UTC | Jul 6, 08:45 UTC | 12h 5m |
| 2026-07-05 | UAL153 | HKG → LAX | Jul 5, 04:55 UTC | Jul 5, 17:45 UTC | 12h 50m |
| 2026-07-05 | UAL153 | HKG → LAX | Jul 5, 02:15 UTC | Jul 5, 02:35 UTC | 20m |
| 2026-07-05 | UAL153 | HKG → LAX | Jul 5, 00:19 UTC | Jul 5, 02:32 UTC | 2h 13m |
| 2026-07-04 | UAL152 | LAX → HKG | Jul 4, 14:30 UTC | Jul 4, 14:40 UTC | 10m |
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 N23983 page for operator, model, and routing details .