sensors Mode-S transponder
A9F2C6
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N740CK · BOEING 747-400 · operated by KALITTA AIR LLC
- Hex
- A9F2C6
- Octal
- 52371306
- Decimal
- 11,137,734
- Country
- US
- Tail
- N740CK
- Type
- B744
- Flights observed
- 66
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 12d ago
Last known position
Country allocation
The ICAO 24-bit address A9F2C6 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 |
|---|---|---|---|
| CKS9740 | Kalitta Air | 10 | 2026-05-18 |
| CKS529 | Kalitta Air | 7 | 2026-04-17 |
| CMB547 | - | 6 | 2026-04-13 |
| CKS9164 | Kalitta Air | 6 | 2026-05-09 |
| CKS557 | Kalitta Air | 4 | 2026-05-17 |
| CMB164 | - | 3 | 2026-05-09 |
| CKS961 | Kalitta Air | 3 | 2026-05-02 |
| CKS819 | Kalitta Air | 3 | 2026-04-25 |
| CKS785 | Kalitta Air | 3 | 2026-05-08 |
| CKS601 | Kalitta Air | 3 | 2026-05-12 |
| CKS533 | Kalitta Air | 3 | 2026-04-19 |
| CKS9705 | Kalitta Air | 2 | 2026-05-04 |
| CKS960 | Kalitta Air | 2 | 2026-05-01 |
| CKS932 | Kalitta Air | 2 | 2026-04-21 |
| CKS931 | Kalitta Air | 2 | 2026-04-22 |
| CKS810 | Kalitta Air | 2 | 2026-04-23 |
| CKS556 | Kalitta Air | 2 | 2026-05-16 |
| CMB511 | - | 1 | 2026-04-15 |
| CKS535 | Kalitta Air | 1 | 2026-04-20 |
| CKS419 | - | 1 | 2026-05-04 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-18 | CKS9740 | JFK → CVG | May 18, 00:55 UTC | May 18, 01:25 UTC | 30m |
| 2026-05-17 | CKS557 | HKG → HKG | May 17, 16:40 UTC | May 17, 22:05 UTC | 5h 25m |
| 2026-05-17 | CKS557 | HKG → HKG | May 17, 08:10 UTC | May 17, 14:25 UTC | 6h 15m |
| 2026-05-16 | CKS556 | CVG → ANC | May 16, 12:11 UTC | May 17, 00:05 UTC | 11h 55m |
| 2026-05-15 | CKS557 | HKG → HKG | May 15, 21:45 UTC | May 16, 03:20 UTC | 5h 35m |
| 2026-05-15 | CKS557 | HKG → HKG | May 15, 09:45 UTC | May 15, 16:55 UTC | 7h 9m |
| 2026-05-14 | CKS556 | CVG → ANC | May 14, 11:30 UTC | May 14, 22:50 UTC | 11h 20m |
| 2026-05-12 | CKS601 | ANC → ORD | May 12, 11:45 UTC | May 12, 16:50 UTC | 5h 5m |
| 2026-05-12 | CKS601 | ANC → ORD | May 12, 03:05 UTC | May 12, 10:00 UTC | 6h 55m |
| 2026-05-11 | CKS601 | ANC → ORD | May 11, 19:10 UTC | May 11, 21:50 UTC | 2h 40m |
| 2026-05-09 | CKS9164 | RMS → IAD | May 9, 18:50 UTC | May 9, 22:39 UTC | 3h 50m |
| 2026-05-09 | CMB164 | - | May 9, 06:20 UTC | May 9, 13:50 UTC | 7h 30m |
| 2026-05-09 | CKS9164 | RMS → IAD | May 9, 00:15 UTC | May 9, 01:40 UTC | 1h 25m |
| 2026-05-08 | CKS785 | ANC → ORD | May 8, 10:54 UTC | May 8, 15:55 UTC | 5h 0m |
| 2026-05-08 | CKS785 | ANC → ORD | May 8, 01:55 UTC | May 8, 09:04 UTC | 7h 10m |
| 2026-05-07 | CKS785 | ANC → ORD | May 7, 23:34 UTC | May 7, 23:45 UTC | 10m |
| 2026-05-04 | CKS9705 | OSC → CVG | May 4, 22:20 UTC | May 5, 07:10 UTC | 8h 50m |
| 2026-05-04 | CKS419 | DNA → EIL | May 4, 09:50 UTC | May 4, 17:25 UTC | 7h 35m |
| 2026-05-03 | CKS9705 | OSC → CVG | May 3, 15:45 UTC | May 4, 05:20 UTC | 13h 35m |
| 2026-05-02 | CKS961 | ANC → LAX | May 2, 18:10 UTC | May 2, 22:30 UTC | 4h 20m |
| 2026-05-02 | CKS961 | ANC → LAX | May 2, 09:05 UTC | May 2, 16:05 UTC | 7h 0m |
| 2026-05-02 | CKS961 | ANC → LAX | May 2, 01:05 UTC | May 2, 06:35 UTC | 5h 31m |
| 2026-05-01 | CKS960 | LAX → ANC | May 1, 17:00 UTC | May 2, 01:00 UTC | 8h 0m |
| 2026-05-01 | CKS960 | LAX → ANC | May 1, 07:25 UTC | May 1, 13:00 UTC | 5h 35m |
| 2026-04-25 | CKS9740 | JFK → CVG | Apr 25, 16:00 UTC | Apr 25, 18:20 UTC | 2h 20m |
| 2026-04-25 | CKS819 | ANC → NLU | Apr 25, 04:55 UTC | Apr 25, 12:20 UTC | 7h 25m |
| 2026-04-24 | CKS819 | ANC → NLU | Apr 24, 02:40 UTC | Apr 24, 09:40 UTC | 7h 0m |
| 2026-04-23 | CKS819 | ANC → NLU | Apr 23, 22:50 UTC | Apr 23, 23:05 UTC | 15m |
| 2026-04-23 | CKS810 | JFK → ICN | Apr 23, 08:35 UTC | Apr 23, 16:55 UTC | 8h 20m |
| 2026-04-23 | CKS810 | JFK → ICN | Apr 23, 00:55 UTC | Apr 23, 06:35 UTC | 5h 41m |
| 2026-04-22 | CKS931 | ANC → MIA | Apr 22, 13:30 UTC | Apr 22, 18:40 UTC | 5h 10m |
| 2026-04-22 | CKS931 | ANC → MIA | Apr 22, 04:05 UTC | Apr 22, 11:25 UTC | 7h 20m |
| 2026-04-21 | CKS932 | CVG → ANC | Apr 21, 08:40 UTC | Apr 21, 23:45 UTC | 15h 5m |
| 2026-04-20 | CKS932 | CVG → ANC | Apr 20, 23:25 UTC | Apr 21, 05:55 UTC | 6h 30m |
| 2026-04-20 | CKS535 | ANC → NLU | Apr 20, 01:20 UTC | Apr 20, 07:35 UTC | 6h 15m |
| 2026-04-19 | CKS533 | HKG → ANC | Apr 19, 22:30 UTC | Apr 19, 22:50 UTC | 20m |
| 2026-04-19 | CKS533 | HKG → ANC | Apr 19, 15:10 UTC | Apr 19, 16:50 UTC | 1h 40m |
| 2026-04-19 | CKS533 | HKG → ANC | Apr 19, 09:15 UTC | Apr 19, 12:00 UTC | 2h 45m |
| 2026-04-19 | CKS9164 | RMS → IAD | Apr 19, 05:20 UTC | Apr 19, 06:00 UTC | 40m |
| 2026-04-18 | CKS9164 | RMS → IAD | Apr 18, 18:10 UTC | Apr 18, 20:20 UTC | 2h 10m |
| 2026-04-18 | CMB164 | - | Apr 18, 07:25 UTC | Apr 18, 08:15 UTC | 50m |
| 2026-04-18 | CMB164 | - | Apr 18, 06:25 UTC | Apr 18, 13:25 UTC | 7h 0m |
| 2026-04-18 | CKS9164 | RMS → IAD | Apr 18, 01:25 UTC | Apr 18, 02:35 UTC | 1h 10m |
| 2026-04-18 | CKS9164 | RMS → IAD | Apr 18, 01:00 UTC | Apr 18, 01:20 UTC | 20m |
| 2026-04-17 | CKS529 | ANC → LAX | Apr 17, 21:25 UTC | Apr 17, 22:35 UTC | 1h 10m |
| 2026-04-17 | CKS529 | ANC → LAX | Apr 17, 19:25 UTC | Apr 17, 21:20 UTC | 1h 55m |
| 2026-04-17 | CKS529 | ANC → LAX | Apr 17, 17:25 UTC | Apr 17, 19:10 UTC | 1h 45m |
| 2026-04-17 | CKS529 | ANC → LAX | Apr 17, 17:05 UTC | Apr 17, 17:15 UTC | 10m |
| 2026-04-17 | CKS529 | ANC → LAX | Apr 17, 11:20 UTC | Apr 17, 11:25 UTC | 5m |
| 2026-04-17 | CKS529 | ANC → LAX | Apr 17, 09:50 UTC | Apr 17, 11:15 UTC | 1h 25m |
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 N740CK page for operator, model, and routing details .