sensors Mode-S transponder
AC7A61
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N903AR · BOEING 747-400 · operated by UMB BANK NA TRUSTEE
- Hex
- AC7A61
- Octal
- 53075141
- Decimal
- 11,303,521
- Country
- US
- Tail
- N903AR
- Type
- B744
- Flights observed
- 113
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 1h ago
Last known position
Country allocation
The ICAO 24-bit address AC7A61 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 |
|---|---|---|---|
| KYE7526 | SkyLease Cargo | 15 | 2026-05-30 |
| KYE4525 | SkyLease Cargo | 14 | 2026-05-30 |
| KYE7525 | SkyLease Cargo | 13 | 2026-05-29 |
| KYE4524 | SkyLease Cargo | 13 | 2026-05-31 |
| KYE4515 | SkyLease Cargo | 12 | 2026-05-05 |
| KYE4514 | SkyLease Cargo | 10 | 2026-05-06 |
| KYE4572 | SkyLease Cargo | 4 | 2026-05-26 |
| KYE4521 | SkyLease Cargo | 4 | 2026-04-30 |
| KYE4520 | SkyLease Cargo | 4 | 2026-04-30 |
| KYE9521 | SkyLease Cargo | 3 | 2026-06-03 |
| KYE4526 | SkyLease Cargo | 3 | 2026-04-28 |
| KYE4523 | SkyLease Cargo | 3 | 2026-04-27 |
| KYE4522 | SkyLease Cargo | 3 | 2026-04-29 |
| KYE9520 | SkyLease Cargo | 2 | 2026-06-02 |
| KYE4530 | - | 2 | 2026-05-16 |
| KYE4517 | SkyLease Cargo | 2 | 2026-04-22 |
| KYE4570 | SkyLease Cargo | 1 | 2026-05-27 |
| KYE4551 | SkyLease Cargo | 1 | 2026-05-13 |
| KYE4550 | SkyLease Cargo | 1 | 2026-05-14 |
| KYE4531 | SkyLease Cargo | 1 | 2026-05-15 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-03 | KYE9521 | MIA → ANC | Jun 3, 03:35 UTC | Jun 3, 04:15 UTC | 40m |
| 2026-06-02 | KYE9520 | ANC → MIA | Jun 2, 18:30 UTC | Jun 3, 00:10 UTC | 5h 40m |
| 2026-06-02 | KYE9520 | ANC → MIA | Jun 2, 02:30 UTC | Jun 2, 16:30 UTC | 14h 0m |
| 2026-06-01 | KYE9521 | MIA → ANC | Jun 1, 11:15 UTC | Jun 1, 22:00 UTC | 10h 45m |
| 2026-06-01 | KYE9521 | MIA → ANC | Jun 1, 01:30 UTC | Jun 1, 09:10 UTC | 7h 40m |
| 2026-05-31 | KYE4524 | SCL → MIA | May 31, 16:25 UTC | May 31, 21:30 UTC | 5h 5m |
| 2026-05-31 | KYE4524 | SCL → MIA | May 31, 13:35 UTC | May 31, 13:45 UTC | 10m |
| 2026-05-30 | KYE4525 | ORD → SCL | May 30, 20:50 UTC | May 31, 01:11 UTC | 4h 21m |
| 2026-05-30 | KYE7526 | CGO → ANC | May 30, 08:00 UTC | May 30, 15:40 UTC | 7h 40m |
| 2026-05-29 | KYE7526 | CGO → ANC | May 29, 13:00 UTC | May 30, 06:10 UTC | 17h 10m |
| 2026-05-29 | KYE7525 | MIA → ANC | May 29, 06:35 UTC | May 30, 06:10 UTC | 23h 35m |
| 2026-05-28 | KYE7525 | MIA → ANC | May 28, 18:55 UTC | May 29, 02:30 UTC | 7h 35m |
| 2026-05-27 | KYE4570 | POS → MIA | May 27, 06:04 UTC | May 27, 15:40 UTC | 9h 36m |
| 2026-05-26 | KYE4572 | SCL → SEA | May 26, 23:35 UTC | May 27, 01:44 UTC | 2h 10m |
| 2026-05-26 | KYE4572 | SCL → SEA | May 26, 20:45 UTC | May 26, 21:00 UTC | 15m |
| 2026-05-26 | KYE4572 | SCL → SEA | May 26, 13:40 UTC | May 26, 19:10 UTC | 5h 30m |
| 2026-05-25 | KYE4572 | SCL → SEA | May 25, 23:30 UTC | May 26, 08:54 UTC | 9h 25m |
| 2026-05-25 | KYE4525 | ORD → SCL | May 25, 08:50 UTC | May 25, 13:30 UTC | 4h 40m |
| 2026-05-24 | KYE7526 | CGO → ANC | May 24, 23:00 UTC | May 25, 05:20 UTC | 6h 20m |
| 2026-05-24 | KYE7526 | CGO → ANC | May 24, 00:20 UTC | May 24, 19:10 UTC | 18h 50m |
| 2026-05-23 | KYE7525 | MIA → ANC | May 23, 18:25 UTC | May 24, 18:15 UTC | 23h 50m |
| 2026-05-23 | KYE7525 | MIA → ANC | May 23, 08:50 UTC | May 23, 16:40 UTC | 7h 50m |
| 2026-05-23 | KYE4524 | SCL → MIA | May 23, 00:40 UTC | May 23, 05:30 UTC | 4h 49m |
| 2026-05-22 | KYE4524 | SCL → MIA | May 22, 21:45 UTC | May 22, 21:55 UTC | 10m |
| 2026-05-22 | KYE4525 | ORD → SCL | May 22, 15:45 UTC | May 22, 16:40 UTC | 55m |
| 2026-05-22 | KYE4525 | ORD → SCL | May 22, 07:50 UTC | May 22, 12:30 UTC | 4h 39m |
| 2026-05-21 | KYE7526 | CGO → ANC | May 21, 08:00 UTC | May 21, 15:25 UTC | 7h 25m |
| 2026-05-20 | KYE7526 | CGO → ANC | May 20, 13:00 UTC | May 21, 06:10 UTC | 17h 10m |
| 2026-05-20 | KYE7526 | CGO → ANC | May 20, 08:25 UTC | May 21, 06:10 UTC | 21h 45m |
| 2026-05-20 | KYE7525 | MIA → ANC | May 20, 06:55 UTC | May 21, 06:10 UTC | 23h 15m |
| 2026-05-19 | KYE7525 | MIA → ANC | May 19, 21:25 UTC | May 20, 05:20 UTC | 7h 56m |
| 2026-05-16 | KYE4530 | - | May 16, 10:40 UTC | May 16, 19:00 UTC | 8h 20m |
| 2026-05-16 | KYE4530 | - | May 16, 03:00 UTC | May 16, 03:20 UTC | 20m |
| 2026-05-15 | KYE4531 | MIA → EZE | May 15, 16:45 UTC | May 16, 00:40 UTC | 7h 55m |
| 2026-05-14 | KYE4550 | QRO → YHZ | May 14, 20:10 UTC | May 15, 04:30 UTC | 8h 20m |
| 2026-05-13 | KYE4551 | ORD → ASU | May 13, 17:30 UTC | May 14, 04:00 UTC | 10h 30m |
| 2026-05-12 | KYE4524 | SCL → MIA | May 12, 21:20 UTC | May 13, 02:00 UTC | 4h 40m |
| 2026-05-12 | KYE4525 | ORD → SCL | May 12, 05:35 UTC | May 12, 13:45 UTC | 8h 10m |
| 2026-05-11 | KYE7526 | CGO → ANC | May 11, 16:50 UTC | May 11, 22:35 UTC | 5h 45m |
| 2026-05-10 | KYE7526 | CGO → ANC | May 10, 21:14 UTC | May 11, 15:05 UTC | 17h 50m |
| 2026-05-10 | KYE7526 | CGO → ANC | May 10, 16:20 UTC | May 11, 15:05 UTC | 22h 45m |
| 2026-05-10 | KYE7525 | MIA → ANC | May 10, 15:09 UTC | May 11, 14:15 UTC | 23h 5m |
| 2026-05-10 | KYE7525 | MIA → ANC | May 10, 05:00 UTC | May 10, 13:14 UTC | 8h 15m |
| 2026-05-09 | KYE4524 | SCL → MIA | May 9, 16:35 UTC | May 10, 00:45 UTC | 8h 10m |
| 2026-05-09 | KYE4524 | SCL → MIA | May 9, 13:10 UTC | May 9, 13:45 UTC | 35m |
| 2026-05-09 | KYE4524 | SCL → MIA | May 9, 12:00 UTC | May 9, 12:10 UTC | 10m |
| 2026-05-08 | KYE4525 | ORD → SCL | May 8, 23:15 UTC | May 9, 03:50 UTC | 4h 35m |
| 2026-05-08 | KYE7526 | CGO → ANC | May 8, 07:29 UTC | May 8, 14:15 UTC | 6h 45m |
| 2026-05-07 | KYE7526 | CGO → ANC | May 7, 11:45 UTC | May 8, 05:29 UTC | 17h 45m |
| 2026-05-07 | KYE7526 | CGO → ANC | May 7, 06:30 UTC | May 8, 05:29 UTC | 23h 0m |
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 N903AR page for operator, model, and routing details .