sensors Mode-S transponder
A2CA5D
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N27901 · BOEING 787-8 Dreamliner · operated by UNITED AIRLINES INC
- Hex
- A2CA5D
- Octal
- 50545135
- Decimal
- 10,668,637
- Country
- US
- Tail
- N27901
- Type
- B788
- Flights observed
- 104
- Distinct callsigns
- 19
- Country
- US
- Last broadcast
- 51m ago
Last known position
Country allocation
The ICAO 24-bit address A2CA5D 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 19 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| UAL981 | United Airlines | 13 | 2026-04-20 |
| UAL952 | United Airlines | 11 | 2026-05-18 |
| UAL980 | United Airlines | 9 | 2026-04-20 |
| UAL953 | United Airlines | 8 | 2026-05-18 |
| UAL422 | United Airlines | 7 | 2026-04-18 |
| UAL997 | United Airlines | 6 | 2026-05-22 |
| UAL996 | United Airlines | 6 | 2026-05-29 |
| UAL613 | United Airlines | 5 | 2026-05-28 |
| UAL612 | United Airlines | 5 | 2026-05-27 |
| UAL423 | United Airlines | 5 | 2026-04-19 |
| UAL1147 | United Airlines | 5 | 2026-05-26 |
| UAL983 | United Airlines | 4 | 2026-05-20 |
| UAL982 | United Airlines | 4 | 2026-05-19 |
| UAL2274 | United Airlines | 4 | 2026-05-26 |
| UAL108 | United Airlines | 4 | 2026-05-17 |
| UAL109 | United Airlines | 3 | 2026-05-19 |
| UAL3905 | United Airlines | 2 | 2026-04-26 |
| UAL3884 | United Airlines | 2 | 2026-05-10 |
| UAL3892 | United Airlines | 1 | 2026-05-01 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | UAL996 | IAD → ACC | May 29, 06:00 UTC | May 30, 01:15 UTC | 19h 15m |
| 2026-05-28 | UAL996 | IAD → ACC | May 28, 23:50 UTC | May 29, 07:10 UTC | 7h 20m |
| 2026-05-28 | UAL613 | LOS → IAD | May 28, 02:20 UTC | May 28, 10:25 UTC | 8h 5m |
| 2026-05-27 | UAL612 | IAD → LOS | May 27, 09:50 UTC | May 28, 08:40 UTC | 22h 50m |
| 2026-05-27 | UAL612 | IAD → LOS | May 27, 03:34 UTC | May 28, 02:40 UTC | 23h 5m |
| 2026-05-26 | UAL2274 | EWR → RSW | May 26, 21:04 UTC | May 27, 01:34 UTC | 4h 30m |
| 2026-05-26 | UAL1147 | BOS → EWR | May 26, 12:50 UTC | May 26, 17:59 UTC | 5h 10m |
| 2026-05-25 | UAL2274 | EWR → RSW | May 25, 20:30 UTC | May 26, 01:00 UTC | 4h 30m |
| 2026-05-25 | UAL1147 | BOS → EWR | May 25, 14:05 UTC | May 25, 18:50 UTC | 4h 45m |
| 2026-05-25 | UAL613 | LOS → IAD | May 25, 01:55 UTC | May 25, 10:20 UTC | 8h 25m |
| 2026-05-24 | UAL613 | LOS → IAD | May 24, 10:35 UTC | May 25, 02:30 UTC | 15h 55m |
| 2026-05-24 | UAL612 | IAD → LOS | May 24, 04:15 UTC | May 24, 11:10 UTC | 6h 55m |
| 2026-05-24 | UAL612 | IAD → LOS | May 24, 03:48 UTC | May 24, 13:46 UTC | 9h 58m |
| 2026-05-23 | UAL2274 | EWR → RSW | May 23, 20:00 UTC | May 24, 00:25 UTC | 4h 25m |
| 2026-05-23 | UAL1147 | BOS → EWR | May 23, 12:50 UTC | May 23, 17:35 UTC | 4h 45m |
| 2026-05-23 | UAL1147 | BOS → EWR | May 23, 12:50 UTC | May 23, 17:45 UTC | 4h 55m |
| 2026-05-22 | UAL2274 | EWR → RSW | May 22, 20:00 UTC | May 23, 00:30 UTC | 4h 30m |
| 2026-05-22 | UAL1147 | BOS → EWR | May 22, 13:00 UTC | May 22, 18:05 UTC | 5h 5m |
| 2026-05-22 | UAL997 | ACC → IAD | May 22, 00:40 UTC | May 22, 08:50 UTC | 8h 10m |
| 2026-05-21 | UAL997 | ACC → IAD | May 21, 09:20 UTC | May 22, 08:50 UTC | 23h 30m |
| 2026-05-21 | UAL997 | ACC → IAD | May 21, 09:10 UTC | May 22, 01:35 UTC | 16h 25m |
| 2026-05-21 | UAL996 | IAD → ACC | May 21, 02:30 UTC | May 22, 01:15 UTC | 22h 45m |
| 2026-05-20 | UAL983 | ATH → IAD | May 20, 09:35 UTC | May 20, 20:10 UTC | 10h 35m |
| 2026-05-19 | UAL982 | IAD → ATH | May 19, 22:30 UTC | May 20, 07:40 UTC | 9h 11m |
| 2026-05-19 | UAL109 | EDI → EWR | May 19, 10:25 UTC | May 19, 18:40 UTC | 8h 15m |
| 2026-05-18 | UAL953 | ORD → MUC | May 18, 23:50 UTC | May 19, 01:05 UTC | 1h 15m |
| 2026-05-18 | UAL953 | ORD → MUC | May 18, 23:28 UTC | May 19, 07:53 UTC | 8h 25m |
| 2026-05-18 | UAL952 | MUC → ORD | May 18, 09:45 UTC | May 18, 19:00 UTC | 9h 14m |
| 2026-05-17 | UAL108 | EWR → EDI | May 17, 22:01 UTC | May 18, 00:00 UTC | 2h 0m |
| 2026-05-17 | UAL108 | EWR → EDI | May 17, 21:58 UTC | May 18, 05:42 UTC | 7h 44m |
| 2026-05-16 | UAL997 | ACC → IAD | May 16, 07:11 UTC | May 16, 09:31 UTC | 2h 20m |
| 2026-05-14 | UAL996 | IAD → ACC | May 14, 23:40 UTC | May 15, 06:30 UTC | 6h 50m |
| 2026-05-14 | UAL983 | ATH → IAD | May 14, 09:20 UTC | May 14, 19:30 UTC | 10h 10m |
| 2026-05-13 | UAL982 | IAD → ATH | May 13, 21:33 UTC | May 14, 06:24 UTC | 8h 51m |
| 2026-05-13 | UAL982 | IAD → ATH | May 13, 21:25 UTC | May 13, 23:15 UTC | 1h 50m |
| 2026-05-12 | UAL983 | ATH → IAD | May 12, 09:05 UTC | May 12, 19:35 UTC | 10h 30m |
| 2026-05-12 | UAL983 | ATH → IAD | May 12, 09:00 UTC | May 12, 11:15 UTC | 2h 15m |
| 2026-05-11 | UAL982 | IAD → ATH | May 11, 21:30 UTC | May 12, 06:15 UTC | 8h 45m |
| 2026-05-11 | UAL109 | EDI → EWR | May 11, 10:20 UTC | May 11, 18:55 UTC | 8h 35m |
| 2026-05-10 | UAL953 | ORD → MUC | May 10, 23:15 UTC | May 11, 07:10 UTC | 7h 55m |
| 2026-05-10 | UAL3884 | IAD → ORD | May 10, 00:05 UTC | May 10, 09:50 UTC | 9h 45m |
| 2026-05-09 | UAL3884 | IAD → ORD | May 9, 23:09 UTC | May 9, 23:20 UTC | 10m |
| 2026-05-01 | UAL3892 | IAD → EWR | May 1, 04:05 UTC | May 1, 13:55 UTC | 9h 50m |
| 2026-04-30 | UAL952 | MUC → ORD | Apr 30, 09:40 UTC | Apr 30, 11:15 UTC | 1h 35m |
| 2026-04-30 | UAL952 | MUC → ORD | Apr 30, 09:47 UTC | Apr 30, 18:15 UTC | 8h 28m |
| 2026-04-30 | UAL952 | MUC → ORD | Apr 30, 09:47 UTC | Apr 30, 18:11 UTC | 8h 24m |
| 2026-04-29 | UAL953 | ORD → MUC | Apr 29, 23:20 UTC | Apr 30, 07:25 UTC | 8h 5m |
| 2026-04-29 | UAL952 | MUC → ORD | Apr 29, 09:45 UTC | Apr 29, 18:35 UTC | 8h 50m |
| 2026-04-28 | UAL108 | EWR → EDI | Apr 28, 22:15 UTC | Apr 29, 06:00 UTC | 7h 45m |
| 2026-04-26 | UAL613 | LOS → IAD | Apr 26, 23:15 UTC | Apr 27, 10:39 UTC | 11h 24m |
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 N27901 page for operator, model, and routing details .