sensors Mode-S transponder
AABBEF
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N791CA · BOEING 777-200LR
- Hex
- AABBEF
- Octal
- 52535757
- Decimal
- 11,189,231
- Country
- US
- Tail
- N791CA
- Type
- B77L
- Flights observed
- 37
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 6h ago
Last known position
Country allocation
The ICAO 24-bit address AABBEF 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 |
|---|---|---|---|
| NCR8844 | - | 3 | 2026-07-02 |
| NCR8801 | - | 3 | 2026-07-08 |
| NCR864 | - | 3 | 2026-06-05 |
| NCR8845 | - | 2 | 2026-07-02 |
| NCR8826 | - | 2 | 2026-06-25 |
| NCR8815 | - | 2 | 2026-07-14 |
| NCR8802 | - | 2 | 2026-07-08 |
| NCR711 | - | 2 | 2026-05-27 |
| N791CA | - | 2 | 2026-04-15 |
| NCR8859 | - | 1 | 2026-06-26 |
| NCR8858 | - | 1 | 2026-06-26 |
| NCR8847 | - | 1 | 2026-06-16 |
| NCR8846 | - | 1 | 2026-06-15 |
| NCR8836 | - | 1 | 2026-06-15 |
| NCR8834 | - | 1 | 2026-06-10 |
| NCR8833 | - | 1 | 2026-06-10 |
| NCR8830 | - | 1 | 2026-06-08 |
| NCR8829 | - | 1 | 2026-06-08 |
| NCR8825 | - | 1 | 2026-06-23 |
| NCR8823 | - | 1 | 2026-07-07 |
Recent flights last 37
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-14 | NCR8815 | - | Jul 14, 04:00 UTC | Jul 14, 04:10 UTC | 10m |
| 2026-07-14 | NCR8815 | - | Jul 14, 00:30 UTC | Jul 14, 00:55 UTC | 25m |
| 2026-07-09 | NCR8806 | - | Jul 9, 19:55 UTC | Jul 10, 11:10 UTC | 15h 15m |
| 2026-07-08 | NCR8802 | - | Jul 8, 19:00 UTC | Jul 8, 23:00 UTC | 4h 0m |
| 2026-07-08 | NCR8802 | - | Jul 8, 15:25 UTC | Jul 8, 18:55 UTC | 3h 30m |
| 2026-07-08 | NCR8801 | - | Jul 8, 01:25 UTC | Jul 8, 09:30 UTC | 8h 5m |
| 2026-07-07 | NCR8801 | - | Jul 7, 07:50 UTC | Jul 8, 07:45 UTC | 23h 55m |
| 2026-07-07 | NCR8801 | - | Jul 7, 07:20 UTC | Jul 8, 05:45 UTC | 22h 25m |
| 2026-07-07 | NCR8823 | - | Jul 7, 03:35 UTC | Jul 7, 04:25 UTC | 50m |
| 2026-07-02 | NCR8845 | - | Jul 2, 15:00 UTC | Jul 2, 22:15 UTC | 7h 15m |
| 2026-07-02 | NCR8844 | - | Jul 2, 04:30 UTC | Jul 2, 12:10 UTC | 7h 40m |
| 2026-06-26 | NCR8859 | - | Jun 26, 22:34 UTC | Jun 27, 06:15 UTC | 7h 40m |
| 2026-06-26 | NCR8858 | - | Jun 26, 12:29 UTC | Jun 26, 19:50 UTC | 7h 20m |
| 2026-06-25 | NCR8826 | - | Jun 25, 02:54 UTC | Jun 25, 08:55 UTC | 6h 0m |
| 2026-06-24 | NCR8826 | - | Jun 24, 16:34 UTC | Jun 25, 00:09 UTC | 7h 35m |
| 2026-06-23 | NCR8825 | - | Jun 23, 14:59 UTC | Jun 24, 04:05 UTC | 13h 5m |
| 2026-06-19 | NCR8845 | - | Jun 19, 11:45 UTC | Jun 19, 11:59 UTC | 15m |
| 2026-06-19 | NCR8844 | - | Jun 19, 07:54 UTC | Jun 19, 08:24 UTC | 30m |
| 2026-06-19 | NCR8844 | - | Jun 19, 01:04 UTC | Jun 19, 01:15 UTC | 10m |
| 2026-06-16 | NCR8847 | - | Jun 16, 05:15 UTC | Jun 16, 23:35 UTC | 18h 21m |
| 2026-06-15 | NCR8846 | - | Jun 15, 23:54 UTC | Jun 16, 00:45 UTC | 50m |
| 2026-06-15 | NCR8836 | - | Jun 15, 04:25 UTC | Jun 15, 04:55 UTC | 30m |
| 2026-06-10 | NCR8834 | - | Jun 10, 22:15 UTC | Jun 10, 22:35 UTC | 20m |
| 2026-06-10 | NCR8833 | - | Jun 10, 10:00 UTC | Jun 10, 18:35 UTC | 8h 35m |
| 2026-06-08 | NCR8830 | - | Jun 8, 08:25 UTC | Jun 8, 08:35 UTC | 10m |
| 2026-06-08 | NCR8829 | - | Jun 8, 04:55 UTC | Jun 8, 05:10 UTC | 15m |
| 2026-06-05 | NCR864 | - | Jun 5, 16:30 UTC | Jun 5, 17:05 UTC | 35m |
| 2026-06-05 | NCR864 | - | Jun 5, 10:00 UTC | Jun 5, 14:15 UTC | 4h 15m |
| 2026-06-04 | NCR864 | JFK → PIK | Jun 4, 23:55 UTC | Jun 5, 06:35 UTC | 6h 40m |
| 2026-06-03 | NCR715 | - | Jun 3, 18:00 UTC | Jun 3, 19:20 UTC | 1h 20m |
| 2026-06-03 | NCR714 | - | Jun 3, 15:45 UTC | Jun 3, 16:50 UTC | 1h 5m |
| 2026-06-03 | NCR713 | - | Jun 3, 13:10 UTC | Jun 3, 14:30 UTC | 1h 20m |
| 2026-05-28 | NCR712 | - | May 28, 20:45 UTC | May 29, 04:15 UTC | 7h 30m |
| 2026-05-27 | NCR711 | - | May 27, 23:50 UTC | May 28, 02:50 UTC | 3h 0m |
| 2026-05-27 | NCR711 | - | May 27, 14:40 UTC | May 27, 20:35 UTC | 5h 55m |
| 2026-04-15 | N791CA | - | Apr 15, 19:05 UTC | Apr 15, 20:05 UTC | 1h 0m |
| 2026-04-15 | N791CA | - | Apr 15, 17:05 UTC | Apr 15, 19:00 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 N791CA page for operator, model, and routing details .