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
- 93
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 27m ago
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 |
|---|---|---|---|
| UAL153 | United Airlines | 8 | 2026-04-29 |
| UAL152 | United Airlines | 7 | 2026-04-28 |
| UAL199 | United Airlines | 5 | 2026-05-01 |
| UAL1855 | United Airlines | 5 | 2026-04-24 |
| UAL82 | United Airlines | 4 | 2026-05-27 |
| UAL1321 | United Airlines | 4 | 2026-04-16 |
| UAL123 | United Airlines | 4 | 2026-05-23 |
| UAL863 | United Airlines | 3 | 2026-05-11 |
| UAL83 | United Airlines | 3 | 2026-05-27 |
| UAL2692 | United Airlines | 3 | 2026-05-14 |
| UAL198 | United Airlines | 3 | 2026-04-29 |
| UAL1227 | United Airlines | 3 | 2026-05-23 |
| UAL923 | United Airlines | 2 | 2026-05-14 |
| UAL842 | United Airlines | 2 | 2026-05-29 |
| UAL772 | United Airlines | 2 | 2026-04-27 |
| UAL771 | United Airlines | 2 | 2026-04-26 |
| UAL713 | United Airlines | 2 | 2026-05-26 |
| UAL63 | United Airlines | 2 | 2026-05-19 |
| UAL33 | United Airlines | 2 | 2026-05-05 |
| UAL32 | United Airlines | 2 | 2026-05-16 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | UAL842 | SYD → LAX | May 29, 23:50 UTC | May 30, 12:45 UTC | 12h 55m |
| 2026-05-29 | UAL839 | LAX → SYD | May 29, 06:10 UTC | May 29, 20:25 UTC | 14h 15m |
| 2026-05-28 | UAL2403 | RDU → EWR | May 28, 16:30 UTC | May 28, 21:25 UTC | 4h 55m |
| 2026-05-27 | UAL83 | DEL → EWR | May 27, 20:15 UTC | May 28, 11:40 UTC | 15h 25m |
| 2026-05-27 | UAL82 | EWR → DEL | May 27, 01:39 UTC | May 27, 15:25 UTC | 13h 45m |
| 2026-05-26 | UAL713 | ORD → DEL | May 26, 17:35 UTC | May 26, 22:25 UTC | 4h 50m |
| 2026-05-26 | UAL61 | BRU → EWR | May 26, 01:14 UTC | May 26, 15:14 UTC | 14h 0m |
| 2026-05-25 | UAL60 | SFO → MEL | May 25, 07:10 UTC | May 25, 21:54 UTC | 14h 44m |
| 2026-05-24 | UAL1757 | PIT → DEN | May 24, 23:00 UTC | May 25, 03:25 UTC | 4h 25m |
| 2026-05-24 | UAL1849 | MCO → EWR | May 24, 15:30 UTC | May 24, 19:55 UTC | 4h 25m |
| 2026-05-23 | UAL1227 | PHX → IAD | May 23, 18:05 UTC | May 23, 23:25 UTC | 5h 20m |
| 2026-05-23 | UAL123 | ANC → ORD | May 23, 07:05 UTC | May 23, 14:15 UTC | 7h 10m |
| 2026-05-22 | UAL122 | IAD → LHR | May 22, 14:10 UTC | May 22, 20:00 UTC | 5h 50m |
| 2026-05-21 | UAL2222 | IAD → CPT | May 21, 19:32 UTC | May 22, 10:01 UTC | 14h 29m |
| 2026-05-21 | UAL2222 | IAD → CPT | May 21, 19:20 UTC | May 22, 09:55 UTC | 14h 35m |
| 2026-05-21 | UAL1122 | EWR → CPT | May 21, 03:15 UTC | May 21, 16:45 UTC | 13h 30m |
| 2026-05-21 | UAL1122 | EWR → CPT | May 21, 02:46 UTC | May 21, 17:01 UTC | 14h 15m |
| 2026-05-20 | UAL78 | NRT → EWR | May 20, 08:40 UTC | May 20, 20:15 UTC | 11h 35m |
| 2026-05-19 | UAL7 | IAH → NRT | May 19, 15:30 UTC | May 20, 04:35 UTC | 13h 5m |
| 2026-05-19 | UAL63 | GRU → IAH | May 19, 01:25 UTC | May 19, 11:15 UTC | 9h 50m |
| 2026-05-19 | UAL63 | GRU → IAH | May 19, 01:11 UTC | May 19, 11:00 UTC | 9h 49m |
| 2026-05-18 | UAL62 | IAH → GRU | May 18, 00:10 UTC | May 18, 09:25 UTC | 9h 15m |
| 2026-05-17 | UAL6 | NRT → IAH | May 17, 08:10 UTC | May 17, 19:20 UTC | 11h 10m |
| 2026-05-16 | UAL32 | LAX → NRT | May 16, 18:00 UTC | May 17, 04:50 UTC | 10h 50m |
| 2026-05-15 | UAL935 | LHR → LAX | May 15, 12:55 UTC | May 15, 23:20 UTC | 10h 24m |
| 2026-05-14 | UAL923 | LAX → LHR | May 14, 22:45 UTC | May 15, 08:45 UTC | 10h 0m |
| 2026-05-14 | UAL923 | LAX → LHR | May 14, 22:48 UTC | May 15, 08:49 UTC | 10h 1m |
| 2026-05-14 | UAL2692 | IAD → PHL | May 14, 13:54 UTC | May 14, 18:38 UTC | 4h 44m |
| 2026-05-14 | UAL2692 | IAD → PHL | May 14, 13:50 UTC | May 14, 18:40 UTC | 4h 50m |
| 2026-05-14 | UAL83 | DEL → EWR | May 14, 08:50 UTC | May 14, 10:10 UTC | 1h 20m |
| 2026-05-13 | UAL83 | DEL → EWR | May 13, 18:55 UTC | May 14, 08:45 UTC | 13h 50m |
| 2026-05-13 | UAL82 | EWR → DEL | May 13, 15:50 UTC | May 13, 16:15 UTC | 25m |
| 2026-05-13 | UAL82 | EWR → DEL | May 13, 01:21 UTC | May 13, 15:33 UTC | 14h 12m |
| 2026-05-13 | UAL82 | EWR → DEL | May 13, 01:20 UTC | May 13, 16:15 UTC | 14h 55m |
| 2026-05-12 | UAL713 | ORD → DEL | May 12, 17:35 UTC | May 12, 22:20 UTC | 4h 45m |
| 2026-05-12 | UAL870 | SYD → SFO | May 12, 13:00 UTC | May 12, 13:35 UTC | 35m |
| 2026-05-11 | UAL863 | SFO → SYD | May 11, 06:40 UTC | May 11, 21:20 UTC | 14h 41m |
| 2026-05-10 | UAL1227 | PHX → IAD | May 10, 17:45 UTC | May 10, 23:09 UTC | 5h 25m |
| 2026-05-10 | UAL123 | ANC → ORD | May 10, 06:59 UTC | May 10, 08:15 UTC | 1h 15m |
| 2026-05-10 | UAL123 | ANC → ORD | May 10, 07:02 UTC | May 10, 13:59 UTC | 6h 57m |
| 2026-05-10 | UAL123 | ANC → ORD | May 10, 07:02 UTC | May 10, 14:06 UTC | 7h 4m |
| 2026-05-09 | UAL122 | IAD → LHR | May 9, 14:00 UTC | May 9, 20:20 UTC | 6h 20m |
| 2026-05-06 | UAL2303 | IAD → SAN | May 6, 08:25 UTC | May 6, 12:30 UTC | 4h 5m |
| 2026-05-05 | UAL33 | NRT → LAX | May 5, 08:40 UTC | May 5, 18:10 UTC | 9h 30m |
| 2026-05-04 | UAL79 | EWR → NRT | May 4, 15:45 UTC | May 5, 05:25 UTC | 13h 41m |
| 2026-05-03 | UAL187 | JNB → EWR | May 3, 20:20 UTC | May 4, 12:20 UTC | 16h 0m |
| 2026-05-03 | UAL188 | EWR → JNB | May 3, 02:20 UTC | May 3, 16:05 UTC | 13h 44m |
| 2026-05-02 | UAL2096 | LAX → EWR | May 2, 16:05 UTC | May 2, 20:30 UTC | 4h 25m |
| 2026-05-01 | UAL199 | PVG → LAX | May 1, 14:15 UTC | May 2, 00:15 UTC | 10h 0m |
| 2026-04-29 | UAL198 | LAX → PVG | Apr 29, 19:55 UTC | Apr 30, 07:50 UTC | 11h 54m |
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 .