sensors Mode-S transponder
A6CBDD
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N537QS · CESSNA 680 Citation Latitude · operated by NETJETS SALES INC, GYPSUM MANAGEMENT AND SUPPLY INC, K INTERNATIONAL INC, MAKM LLC, NSB AIR LLC, O GREAT SARGE LLC
- Hex
- A6CBDD
- Octal
- 51545735
- Decimal
- 10,931,165
- Country
- US
- Tail
- N537QS
- Type
- C68A
- Flights observed
- 148
- Distinct callsigns
- 2
- Country
- US
- Last broadcast
- 10h ago
Last known position
Country allocation
The ICAO 24-bit address A6CBDD 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 2 distinct
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-13 | EJA537 | - | Jul 13, 20:35 UTC | Jul 13, 21:40 UTC | 1h 5m |
| 2026-07-13 | EJA537 | - | Jul 13, 17:40 UTC | Jul 13, 19:45 UTC | 2h 5m |
| 2026-07-13 | EJA537 | - | Jul 13, 15:55 UTC | Jul 13, 16:50 UTC | 55m |
| 2026-07-13 | EJA537 | - | Jul 13, 14:10 UTC | Jul 13, 14:45 UTC | 35m |
| 2026-07-13 | EJA537 | - | Jul 13, 03:01 UTC | Jul 13, 03:55 UTC | 55m |
| 2026-07-12 | EJA537 | - | Jul 12, 22:45 UTC | Jul 12, 23:30 UTC | 45m |
| 2026-07-12 | EJA537 | - | Jul 12, 18:25 UTC | Jul 12, 20:35 UTC | 2h 10m |
| 2026-07-12 | EJA537 | - | Jul 12, 01:45 UTC | Jul 12, 04:35 UTC | 2h 50m |
| 2026-07-11 | EJA537 | - | Jul 11, 13:30 UTC | Jul 11, 18:05 UTC | 4h 35m |
| 2026-07-10 | EJA537 | - | Jul 10, 21:20 UTC | Jul 10, 22:40 UTC | 1h 20m |
| 2026-07-10 | EJA537 | - | Jul 10, 16:30 UTC | Jul 10, 18:15 UTC | 1h 45m |
| 2026-07-09 | EJA537 | - | Jul 9, 19:20 UTC | Jul 10, 18:15 UTC | 22h 55m |
| 2026-07-09 | EJA537 | - | Jul 9, 17:20 UTC | Jul 10, 17:05 UTC | 23h 45m |
| 2026-07-09 | EJA537 | - | Jul 9, 16:25 UTC | Jul 9, 21:00 UTC | 4h 35m |
| 2026-07-09 | EJA537 | - | Jul 9, 11:55 UTC | Jul 9, 14:25 UTC | 2h 30m |
| 2026-07-08 | EJA537 | - | Jul 8, 19:00 UTC | Jul 8, 19:50 UTC | 50m |
| 2026-07-08 | EJA537 | - | Jul 8, 15:50 UTC | Jul 8, 16:40 UTC | 50m |
| 2026-07-07 | EJA537 | - | Jul 7, 17:15 UTC | Jul 7, 19:50 UTC | 2h 35m |
| 2026-07-07 | EJA537 | - | Jul 7, 13:50 UTC | Jul 7, 14:35 UTC | 45m |
| 2026-07-05 | EJA537 | - | Jul 5, 17:15 UTC | Jul 5, 19:35 UTC | 2h 20m |
| 2026-07-05 | EJA537 | - | Jul 5, 15:25 UTC | Jul 5, 15:50 UTC | 25m |
| 2026-07-03 | EJA537 | - | Jul 3, 14:15 UTC | Jul 3, 14:55 UTC | 40m |
| 2026-07-02 | EJA537 | - | Jul 2, 21:15 UTC | Jul 2, 22:35 UTC | 1h 20m |
| 2026-07-02 | EJA537 | - | Jul 2, 18:55 UTC | Jul 2, 19:40 UTC | 45m |
| 2026-07-02 | EJA537 | - | Jul 2, 16:35 UTC | Jul 2, 18:00 UTC | 1h 25m |
| 2026-06-29 | EJA537 | - | Jun 29, 14:50 UTC | Jun 29, 17:14 UTC | 2h 25m |
| 2026-06-29 | EJA537 | - | Jun 29, 13:24 UTC | Jun 29, 13:54 UTC | 30m |
| 2026-06-28 | EJA537 | - | Jun 28, 22:55 UTC | Jun 29, 00:49 UTC | 1h 55m |
| 2026-06-28 | EJA537 | - | Jun 28, 20:29 UTC | Jun 28, 21:20 UTC | 50m |
| 2026-05-30 | EJA537 | BED → MDW | May 30, 18:35 UTC | May 30, 19:35 UTC | 1h 0m |
| 2026-05-30 | EJA537 | BED → MDW | May 30, 15:50 UTC | May 30, 17:10 UTC | 1h 20m |
| 2026-05-30 | EJA537 | BED → MDW | May 30, 14:10 UTC | May 30, 14:40 UTC | 30m |
| 2026-05-30 | EJA537 | BED → MDW | May 30, 12:50 UTC | May 30, 13:30 UTC | 40m |
| 2026-05-29 | EJA537 | BED → MDW | May 29, 22:10 UTC | May 29, 22:35 UTC | 25m |
| 2026-05-29 | EJA537 | BED → MDW | May 29, 20:35 UTC | May 29, 21:30 UTC | 55m |
| 2026-05-29 | EJA537 | BED → MDW | May 29, 15:35 UTC | May 29, 16:15 UTC | 40m |
| 2026-05-29 | EJA537 | BED → MDW | May 29, 13:20 UTC | May 29, 14:40 UTC | 1h 20m |
| 2026-05-28 | EJA537 | BED → MDW | May 28, 20:20 UTC | May 28, 22:35 UTC | 2h 15m |
| 2026-05-28 | EJA537 | BED → MDW | May 28, 17:50 UTC | May 28, 18:15 UTC | 25m |
| 2026-05-28 | EJA537 | BED → MDW | May 28, 12:30 UTC | May 28, 15:50 UTC | 3h 20m |
| 2026-05-27 | EJA537 | BED → MDW | May 27, 19:55 UTC | May 27, 21:00 UTC | 1h 5m |
| 2026-05-27 | EJA537 | BED → MDW | May 27, 16:00 UTC | May 27, 18:45 UTC | 2h 45m |
| 2026-05-27 | EJA537 | BED → MDW | May 27, 14:35 UTC | May 27, 14:55 UTC | 20m |
| 2026-05-27 | EJA537 | BED → MDW | May 27, 01:24 UTC | May 27, 01:54 UTC | 30m |
| 2026-05-26 | EJA537 | BED → MDW | May 26, 22:05 UTC | May 26, 22:35 UTC | 30m |
| 2026-05-26 | EJA537 | BED → MDW | May 26, 16:30 UTC | May 26, 19:34 UTC | 3h 5m |
| 2026-05-25 | EJA537 | BED → MDW | May 25, 21:24 UTC | May 26, 03:35 UTC | 6h 10m |
| 2026-05-25 | EJA537 | BED → MDW | May 25, 17:15 UTC | May 25, 18:45 UTC | 1h 30m |
| 2026-05-23 | EJA537 | BED → MDW | May 23, 22:30 UTC | May 23, 23:20 UTC | 50m |
| 2026-05-23 | EJA537 | BED → MDW | May 23, 17:40 UTC | May 23, 20:05 UTC | 2h 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 N537QS page for operator, model, and routing details .