sensors Mode-S transponder
AC948C
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N91CH · CESSNA 510 Citation Mustang · operated by U K CAPITAL
- Hex
- AC948C
- Octal
- 53112214
- Decimal
- 11,310,220
- Country
- US
- Tail
- N91CH
- Type
- C510
- Flights observed
- 43
- Distinct callsigns
- 1
- Country
- US
- Last broadcast
- 3d ago
Last known position
Country allocation
The ICAO 24-bit address AC948C 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 1 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| N91CH | - | 43 | 2026-07-11 |
Recent flights last 43
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-11 | N91CH | - | Jul 11, 17:30 UTC | Jul 11, 19:30 UTC | 2h 0m |
| 2026-07-10 | N91CH | - | Jul 10, 14:35 UTC | Jul 10, 16:10 UTC | 1h 35m |
| 2026-07-06 | N91CH | - | Jul 6, 22:40 UTC | Jul 6, 23:45 UTC | 1h 5m |
| 2026-07-06 | N91CH | - | Jul 6, 15:20 UTC | Jul 6, 17:15 UTC | 1h 55m |
| 2026-07-02 | N91CH | SCF → SLC | Jul 2, 20:30 UTC | Jul 2, 22:00 UTC | 1h 30m |
| 2026-06-29 | N91CH | - | Jun 29, 15:04 UTC | Jun 29, 16:39 UTC | 1h 35m |
| 2026-06-26 | N91CH | CLD → SLC | Jun 26, 18:49 UTC | Jun 26, 20:40 UTC | 1h 50m |
| 2026-06-25 | N91CH | - | Jun 25, 19:24 UTC | Jun 25, 20:34 UTC | 1h 10m |
| 2026-06-22 | N91CH | CLD → SCF | Jun 22, 01:35 UTC | Jun 22, 02:34 UTC | 1h 0m |
| 2026-06-18 | N91CH | - | Jun 18, 20:15 UTC | Jun 18, 21:20 UTC | 1h 5m |
| 2026-06-18 | N91CH | - | Jun 18, 17:35 UTC | Jun 18, 19:25 UTC | 1h 50m |
| 2026-06-18 | N91CH | - | Jun 18, 14:25 UTC | Jun 18, 16:30 UTC | 2h 5m |
| 2026-06-18 | N91CH | BUF → SUS | Jun 18, 10:50 UTC | Jun 18, 13:45 UTC | 2h 55m |
| 2026-06-17 | N91CH | RKV → BUF | Jun 17, 09:00 UTC | Jun 17, 22:20 UTC | 13h 20m |
| 2026-06-16 | N91CH | - | Jun 16, 11:30 UTC | Jun 16, 14:09 UTC | 2h 40m |
| 2026-06-16 | N91CH | - | Jun 16, 09:04 UTC | Jun 16, 10:45 UTC | 1h 40m |
| 2026-06-14 | N91CH | BOD → JER | Jun 14, 08:55 UTC | Jun 14, 10:05 UTC | 1h 10m |
| 2026-06-11 | N91CH | - | Jun 11, 09:20 UTC | Jun 11, 12:10 UTC | 2h 50m |
| 2026-06-08 | N91CH | - | Jun 8, 11:30 UTC | Jun 8, 12:40 UTC | 1h 10m |
| 2026-06-08 | N91CH | - | Jun 8, 08:20 UTC | Jun 8, 10:20 UTC | 2h 0m |
| 2026-06-05 | N91CH | - | Jun 5, 08:30 UTC | Jun 5, 10:10 UTC | 1h 40m |
| 2026-06-02 | N91CH | - | Jun 2, 08:25 UTC | Jun 2, 11:10 UTC | 2h 45m |
| 2026-05-31 | N91CH | RKV → BGO | May 31, 08:40 UTC | May 31, 11:35 UTC | 2h 55m |
| 2026-05-28 | N91CH | - | May 28, 12:00 UTC | May 28, 12:30 UTC | 30m |
| 2026-05-27 | N91CH | - | May 27, 13:05 UTC | May 28, 12:30 UTC | 23h 25m |
| 2026-05-27 | N91CH | - | May 27, 12:55 UTC | May 27, 13:25 UTC | 30m |
| 2026-05-23 | N91CH | - | May 23, 17:05 UTC | May 23, 18:55 UTC | 1h 50m |
| 2026-05-23 | N91CH | - | May 23, 14:35 UTC | May 23, 16:20 UTC | 1h 45m |
| 2026-05-22 | N91CH | - | May 22, 19:10 UTC | May 22, 21:25 UTC | 2h 15m |
| 2026-05-22 | N91CH | - | May 22, 16:20 UTC | May 22, 18:10 UTC | 1h 50m |
| 2026-05-19 | N91CH | SCF → CLD | May 19, 22:15 UTC | May 19, 23:25 UTC | 1h 10m |
| 2026-05-19 | N91CH | CLD → SCF | May 19, 16:20 UTC | May 19, 17:20 UTC | 1h 0m |
| 2026-05-13 | N91CH | - | May 13, 17:25 UTC | May 13, 19:25 UTC | 2h 0m |
| 2026-05-09 | N91CH | - | May 9, 17:45 UTC | May 9, 19:35 UTC | 1h 50m |
| 2026-05-07 | N91CH | - | May 7, 19:45 UTC | May 7, 20:45 UTC | 1h 0m |
| 2026-05-05 | N91CH | - | May 5, 21:50 UTC | May 5, 23:35 UTC | 1h 45m |
| 2026-05-05 | N91CH | - | May 5, 15:05 UTC | May 5, 16:45 UTC | 1h 40m |
| 2026-05-03 | N91CH | CLD → SCF | May 3, 23:10 UTC | May 4, 00:05 UTC | 55m |
| 2026-04-30 | N91CH | - | Apr 30, 23:15 UTC | May 1, 00:15 UTC | 1h 0m |
| 2026-04-27 | N91CH | CLD → SCF | Apr 27, 14:40 UTC | Apr 27, 15:40 UTC | 1h 0m |
| 2026-04-22 | N91CH | - | Apr 22, 19:50 UTC | Apr 22, 21:00 UTC | 1h 10m |
| 2026-04-19 | N91CH | CLD → SCF | Apr 19, 21:35 UTC | Apr 19, 22:40 UTC | 1h 5m |
| 2026-04-15 | N91CH | - | Apr 15, 21:05 UTC | Apr 15, 22:05 UTC | 1h 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 N91CH page for operator, model, and routing details .