sensors Mode-S transponder
A254F7
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N24980 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC
- Hex
- A254F7
- Octal
- 50452367
- Decimal
- 10,638,583
- Country
- US
- Tail
- N24980
- Type
- B789
- Flights observed
- 59
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 3h ago
Last known position
Country allocation
The ICAO 24-bit address A254F7 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 |
|---|---|---|---|
| UAL32 | United Airlines | 5 | 2026-04-18 |
| UAL198 | United Airlines | 4 | 2026-04-15 |
| UAL99 | United Airlines | 3 | 2026-04-17 |
| UAL98 | United Airlines | 3 | 2026-04-16 |
| UAL27 | United Airlines | 3 | 2026-04-20 |
| UAL26 | United Airlines | 3 | 2026-04-21 |
| UAL199 | United Airlines | 3 | 2026-04-15 |
| UAL178 | United Airlines | 3 | 2026-04-22 |
| UAL1227 | United Airlines | 3 | 2026-04-27 |
| UAL893 | United Airlines | 2 | 2026-05-26 |
| UAL892 | United Airlines | 2 | 2026-05-27 |
| UAL761 | United Airlines | 2 | 2026-04-24 |
| UAL262 | United Airlines | 2 | 2026-04-23 |
| UAL181 | United Airlines | 2 | 2026-04-19 |
| UAL143 | United Airlines | 2 | 2026-04-25 |
| UAL142 | United Airlines | 2 | 2026-04-18 |
| UAL870 | United Airlines | 1 | 2026-05-26 |
| UAL863 | United Airlines | 1 | 2026-05-25 |
| UAL760 | United Airlines | 1 | 2026-04-24 |
| UAL3888 | United Airlines | 1 | 2026-05-22 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | UAL188 | EWR → JNB | May 30, 02:00 UTC | May 30, 02:25 UTC | 25m |
| 2026-05-27 | UAL2480 | BOS → SFO | May 27, 22:05 UTC | May 28, 02:45 UTC | 4h 40m |
| 2026-05-27 | UAL892 | ICN → SFO | May 27, 08:10 UTC | May 27, 18:30 UTC | 10h 20m |
| 2026-05-26 | UAL893 | SFO → ICN | May 26, 18:14 UTC | May 27, 06:09 UTC | 11h 55m |
| 2026-05-26 | UAL870 | SYD → SFO | May 26, 01:05 UTC | May 26, 14:09 UTC | 13h 5m |
| 2026-05-25 | UAL863 | SFO → SYD | May 25, 06:50 UTC | May 25, 20:45 UTC | 13h 54m |
| 2026-05-24 | UAL892 | ICN → SFO | May 24, 07:55 UTC | May 24, 17:55 UTC | 10h 0m |
| 2026-05-23 | UAL893 | SFO → ICN | May 23, 18:05 UTC | May 24, 05:45 UTC | 11h 41m |
| 2026-05-23 | UAL114 | PPT → SFO | May 23, 07:20 UTC | May 23, 14:40 UTC | 7h 20m |
| 2026-05-22 | UAL115 | SFO → PPT | May 22, 21:10 UTC | May 23, 05:05 UTC | 7h 54m |
| 2026-05-22 | UAL3888 | AMA → IAH | May 22, 06:20 UTC | May 22, 16:05 UTC | 9h 45m |
| 2026-04-28 | UAL3877 | BFM → DEN | Apr 28, 01:45 UTC | Apr 28, 13:00 UTC | 11h 15m |
| 2026-04-27 | UAL1227 | PHX → IAD | Apr 27, 23:10 UTC | Apr 27, 23:20 UTC | 10m |
| 2026-04-27 | UAL1227 | PHX → IAD | Apr 27, 17:22 UTC | Apr 27, 22:52 UTC | 5h 30m |
| 2026-04-27 | UAL1227 | PHX → IAD | Apr 27, 17:20 UTC | Apr 27, 19:45 UTC | 2h 25m |
| 2026-04-26 | UAL1855 | ORD → BOS | Apr 26, 20:35 UTC | Apr 27, 01:05 UTC | 4h 30m |
| 2026-04-26 | UAL33 | NRT → LAX | Apr 26, 08:10 UTC | Apr 26, 17:20 UTC | 9h 10m |
| 2026-04-25 | UAL143 | DEN → NRT | Apr 25, 17:59 UTC | Apr 26, 05:22 UTC | 11h 23m |
| 2026-04-25 | UAL143 | DEN → NRT | Apr 25, 17:55 UTC | Apr 26, 05:15 UTC | 11h 20m |
| 2026-04-24 | UAL761 | MUC → DEN | Apr 24, 14:25 UTC | Apr 25, 00:15 UTC | 9h 50m |
| 2026-04-24 | UAL761 | MUC → DEN | Apr 24, 14:31 UTC | Apr 25, 00:04 UTC | 9h 33m |
| 2026-04-24 | UAL760 | DEN → MUC | Apr 24, 02:30 UTC | Apr 24, 11:55 UTC | 9h 25m |
| 2026-04-23 | UAL263 | EWR → PBI | Apr 23, 14:05 UTC | Apr 23, 22:50 UTC | 8h 45m |
| 2026-04-23 | UAL262 | DEN → LHR | Apr 23, 02:50 UTC | Apr 23, 11:27 UTC | 8h 37m |
| 2026-04-23 | UAL262 | DEN → LHR | Apr 23, 02:50 UTC | Apr 23, 05:25 UTC | 2h 35m |
| 2026-04-22 | UAL178 | KIX → GUM | Apr 22, 12:50 UTC | Apr 22, 13:45 UTC | 55m |
| 2026-04-22 | UAL178 | KIX → GUM | Apr 22, 12:47 UTC | Apr 22, 23:35 UTC | 10h 48m |
| 2026-04-22 | UAL178 | KIX → GUM | Apr 22, 12:47 UTC | Apr 22, 23:40 UTC | 10h 53m |
| 2026-04-22 | UAL177 | GUM → KIX | Apr 22, 00:35 UTC | Apr 22, 10:35 UTC | 10h 0m |
| 2026-04-21 | UAL26 | LHR → DEN | Apr 21, 13:30 UTC | Apr 21, 22:25 UTC | 8h 55m |
| 2026-04-20 | UAL27 | DEN → LHR | Apr 20, 23:50 UTC | Apr 21, 08:30 UTC | 8h 40m |
| 2026-04-20 | UAL26 | LHR → DEN | Apr 20, 10:55 UTC | Apr 20, 12:00 UTC | 1h 5m |
| 2026-04-20 | UAL26 | LHR → DEN | Apr 20, 10:50 UTC | Apr 20, 19:51 UTC | 9h 1m |
| 2026-04-19 | UAL27 | DEN → LHR | Apr 19, 23:58 UTC | Apr 20, 08:18 UTC | 8h 20m |
| 2026-04-19 | UAL27 | DEN → LHR | Apr 19, 23:55 UTC | Apr 20, 08:20 UTC | 8h 25m |
| 2026-04-19 | UAL181 | FRA → DEN | Apr 19, 09:50 UTC | Apr 19, 17:45 UTC | 7h 55m |
| 2026-04-19 | UAL181 | FRA → DEN | Apr 19, 09:41 UTC | Apr 19, 19:26 UTC | 9h 45m |
| 2026-04-18 | UAL182 | DEN → FRA | Apr 18, 22:10 UTC | Apr 19, 06:55 UTC | 8h 45m |
| 2026-04-18 | UAL142 | NRT → DEN | Apr 18, 07:50 UTC | Apr 18, 18:01 UTC | 10h 11m |
| 2026-04-18 | UAL142 | NRT → DEN | Apr 18, 07:50 UTC | Apr 18, 17:55 UTC | 10h 5m |
| 2026-04-18 | UAL32 | LAX → NRT | Apr 18, 05:25 UTC | Apr 18, 05:35 UTC | 10m |
| 2026-04-18 | UAL32 | LAX → NRT | Apr 18, 04:50 UTC | Apr 18, 05:20 UTC | 30m |
| 2026-04-17 | UAL32 | LAX → NRT | Apr 17, 22:35 UTC | Apr 17, 23:20 UTC | 45m |
| 2026-04-17 | UAL32 | LAX → NRT | Apr 17, 19:25 UTC | Apr 17, 19:55 UTC | 30m |
| 2026-04-17 | UAL32 | LAX → NRT | Apr 17, 18:20 UTC | Apr 17, 19:20 UTC | 1h 0m |
| 2026-04-17 | UAL99 | MEL → LAX | Apr 17, 13:35 UTC | Apr 17, 14:15 UTC | 40m |
| 2026-04-17 | UAL99 | MEL → LAX | Apr 17, 01:20 UTC | Apr 17, 01:55 UTC | 35m |
| 2026-04-17 | UAL99 | MEL → LAX | Apr 17, 00:44 UTC | Apr 17, 01:15 UTC | 30m |
| 2026-04-16 | UAL98 | LAX → MEL | Apr 16, 21:14 UTC | Apr 16, 21:39 UTC | 25m |
| 2026-04-16 | UAL98 | LAX → MEL | Apr 16, 19:15 UTC | Apr 16, 21:10 UTC | 1h 55m |
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 N24980 page for operator, model, and routing details .