sensors Mode-S transponder
AA6CFA
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N771CK · BOEING 777-300ER · operated by BANK OF UTAH TRUSTEE
- Hex
- AA6CFA
- Octal
- 52466372
- Decimal
- 11,169,018
- Country
- US
- Tail
- N771CK
- Type
- B77W
- Flights observed
- 190
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 18h ago
Last known position
Country allocation
The ICAO 24-bit address AA6CFA 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 |
|---|---|---|---|
| CKS919 | - | 22 | 2026-07-05 |
| CKS979 | - | 21 | 2026-07-06 |
| CKS915 | - | 19 | 2026-07-02 |
| CKS217 | Kalitta Air | 18 | 2026-04-23 |
| CKS970 | - | 15 | 2026-07-05 |
| CKS916 | - | 15 | 2026-07-02 |
| CKS910 | - | 15 | 2026-07-04 |
| CKS235 | Kalitta Air | 12 | 2026-05-10 |
| CKS234 | Kalitta Air | 11 | 2026-05-09 |
| CKS216 | Kalitta Air | 11 | 2026-04-23 |
| CKS523 | - | 6 | 2026-07-13 |
| CKS218 | Kalitta Air | 5 | 2026-05-03 |
| CKS524 | - | 4 | 2026-07-12 |
| CKS219 | Kalitta Air | 4 | 2026-05-04 |
| CKS254 | Kalitta Air | 3 | 2026-05-06 |
| CKS241 | Kalitta Air | 3 | 2026-05-07 |
| CKS577 | - | 2 | 2026-07-09 |
| CKS9780 | - | 1 | 2026-07-07 |
| CKS9771 | Kalitta Air | 1 | 2026-05-11 |
| CKS9769 | - | 1 | 2026-07-09 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-13 | CKS523 | ANC → ORD | Jul 13, 13:35 UTC | Jul 13, 19:00 UTC | 5h 25m |
| 2026-07-13 | CKS523 | - | Jul 13, 04:20 UTC | Jul 13, 11:40 UTC | 7h 20m |
| 2026-07-13 | CKS523 | - | Jul 13, 01:20 UTC | Jul 13, 01:30 UTC | 10m |
| 2026-07-12 | CKS524 | - | Jul 12, 18:45 UTC | Jul 12, 19:25 UTC | 40m |
| 2026-07-12 | CKS524 | - | Jul 12, 03:25 UTC | Jul 12, 16:40 UTC | 13h 15m |
| 2026-07-11 | CKS523 | ANC → ORD | Jul 11, 13:15 UTC | Jul 11, 18:45 UTC | 5h 30m |
| 2026-07-11 | CKS523 | - | Jul 11, 02:20 UTC | Jul 11, 09:55 UTC | 7h 35m |
| 2026-07-10 | CKS523 | - | Jul 10, 23:15 UTC | Jul 10, 23:25 UTC | 10m |
| 2026-07-10 | CKS524 | - | Jul 10, 16:20 UTC | Jul 10, 16:55 UTC | 35m |
| 2026-07-09 | CKS524 | - | Jul 9, 22:30 UTC | Jul 10, 11:20 UTC | 12h 50m |
| 2026-07-09 | CKS9769 | - | Jul 9, 17:10 UTC | Jul 9, 17:35 UTC | 25m |
| 2026-07-09 | CKS577 | - | Jul 9, 12:55 UTC | Jul 9, 13:15 UTC | 20m |
| 2026-07-09 | CKS577 | - | Jul 9, 06:05 UTC | Jul 9, 07:10 UTC | 1h 5m |
| 2026-07-07 | CKS9780 | - | Jul 7, 12:55 UTC | Jul 7, 17:05 UTC | 4h 10m |
| 2026-07-06 | CKS979 | ANC → ORD | Jul 6, 23:00 UTC | Jul 7, 04:15 UTC | 5h 15m |
| 2026-07-06 | CKS979 | - | Jul 6, 05:50 UTC | Jul 6, 20:55 UTC | 15h 5m |
| 2026-07-06 | CKS979 | - | Jul 6, 00:40 UTC | Jul 6, 20:55 UTC | 20h 15m |
| 2026-07-05 | CKS970 | - | Jul 5, 23:40 UTC | Jul 6, 20:55 UTC | 21h 15m |
| 2026-07-05 | CKS970 | YYZ → ANC | Jul 5, 14:25 UTC | Jul 5, 20:10 UTC | 5h 45m |
| 2026-07-05 | CKS919 | - | Jul 5, 06:00 UTC | Jul 5, 11:35 UTC | 5h 35m |
| 2026-07-04 | CKS919 | - | Jul 4, 12:05 UTC | Jul 5, 04:20 UTC | 16h 15m |
| 2026-07-04 | CKS919 | - | Jul 4, 06:35 UTC | Jul 5, 04:20 UTC | 21h 45m |
| 2026-07-04 | CKS910 | ANC → ANC | Jul 4, 05:10 UTC | Jul 5, 04:20 UTC | 23h 10m |
| 2026-07-03 | CKS910 | YYZ → ANC | Jul 3, 19:15 UTC | Jul 4, 01:10 UTC | 5h 55m |
| 2026-07-03 | CKS912 | ANC → YYZ | Jul 3, 11:00 UTC | Jul 3, 16:35 UTC | 5h 35m |
| 2026-07-02 | CKS915 | HKG → ANC | Jul 2, 19:25 UTC | Jul 3, 04:45 UTC | 9h 20m |
| 2026-07-02 | CKS916 | - | Jul 2, 14:10 UTC | Jul 2, 14:15 UTC | 5m |
| 2026-07-02 | CKS916 | - | Jul 2, 03:50 UTC | Jul 2, 13:15 UTC | 9h 25m |
| 2026-07-01 | CKS916 | - | Jul 1, 20:00 UTC | Jul 2, 01:20 UTC | 5h 20m |
| 2026-06-29 | CKS979 | ANC → ORD | Jun 29, 08:29 UTC | Jun 29, 13:59 UTC | 5h 30m |
| 2026-06-28 | CKS979 | - | Jun 28, 14:45 UTC | Jun 29, 05:34 UTC | 14h 50m |
| 2026-06-28 | CKS970 | - | Jun 28, 08:39 UTC | Jun 29, 05:34 UTC | 20h 55m |
| 2026-06-27 | CKS970 | YYZ → ANC | Jun 27, 21:44 UTC | Jun 28, 03:45 UTC | 6h 0m |
| 2026-06-27 | CKS919 | - | Jun 27, 08:20 UTC | Jun 27, 14:00 UTC | 5h 40m |
| 2026-06-26 | CKS919 | - | Jun 26, 13:40 UTC | Jun 27, 05:35 UTC | 15h 55m |
| 2026-06-26 | CKS919 | - | Jun 26, 08:40 UTC | Jun 27, 05:35 UTC | 20h 55m |
| 2026-06-26 | CKS910 | ANC → ANC | Jun 26, 07:35 UTC | Jun 27, 05:35 UTC | 22h 0m |
| 2026-06-25 | CKS910 | YYZ → ANC | Jun 25, 22:59 UTC | Jun 26, 04:50 UTC | 5h 50m |
| 2026-06-25 | CKS919 | - | Jun 25, 13:35 UTC | Jun 25, 19:24 UTC | 5h 50m |
| 2026-06-24 | CKS915 | HKG → ANC | Jun 24, 22:25 UTC | Jun 25, 08:14 UTC | 9h 50m |
| 2026-06-24 | CKS916 | YYZ → ANC | Jun 24, 09:45 UTC | Jun 24, 19:49 UTC | 10h 5m |
| 2026-06-24 | CKS916 | YYZ → ANC | Jun 24, 00:49 UTC | Jun 24, 06:25 UTC | 5h 35m |
| 2026-06-22 | CKS979 | ANC → ORD | Jun 22, 13:54 UTC | Jun 22, 19:14 UTC | 5h 20m |
| 2026-06-21 | CKS979 | - | Jun 21, 20:05 UTC | Jun 22, 12:19 UTC | 16h 15m |
| 2026-06-21 | CKS979 | - | Jun 21, 14:34 UTC | Jun 22, 12:19 UTC | 21h 45m |
| 2026-06-21 | CKS970 | YYZ → ANC | Jun 21, 14:15 UTC | Jun 22, 12:19 UTC | 22h 5m |
| 2026-06-20 | CKS970 | YYZ → ANC | Jun 20, 21:34 UTC | Jun 21, 03:19 UTC | 5h 45m |
| 2026-06-20 | CKS919 | PVG → ANC | Jun 20, 08:09 UTC | Jun 20, 13:55 UTC | 5h 45m |
| 2026-06-19 | CKS919 | PVG → ANC | Jun 19, 10:35 UTC | Jun 20, 06:29 UTC | 19h 55m |
| 2026-06-19 | CKS910 | JFK → ANC | Jun 19, 10:09 UTC | Jun 20, 06:29 UTC | 20h 20m |
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 N771CK page for operator, model, and routing details .