Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A7DF61

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N606UX · EMBRAER ERJ-170-200 (long wing) · operated by UNITED AIRLINES INC

Hex
A7DF61
Octal
51757541
Decimal
11,001,697
Country
US
Tail
N606UX
Type
E75L
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
650
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A7DF61.

Country allocation

The ICAO 24-bit address A7DF61 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
SKW5290 SkyWest Airlines 10 2026-05-09
SKW5975 SkyWest Airlines 8 2026-04-28
SKW5484 SkyWest Airlines 8 2026-05-25
SKW6013 SkyWest Airlines 7 2026-04-28
SKW5985 SkyWest Airlines 7 2026-05-11
SKW5846 SkyWest Airlines 6 2026-07-25
SKW5793 - 6 2026-06-20
SKW5519 SkyWest Airlines 6 2026-07-23
SKW5512 - 6 2026-07-19
SKW5507 SkyWest Airlines 6 2026-07-26
SKW5426 - 6 2026-06-25
SKW4787 - 6 2026-06-29
SKW4730 - 6 2026-06-26
SKW4702 SkyWest Airlines 6 2026-07-20
SKW5604 - 5 2026-07-17
SKW5570 SkyWest Airlines 5 2026-05-11
SKW5542 SkyWest Airlines 5 2026-07-22
SKW5541 - 5 2026-06-21
SKW5492 - 5 2026-06-30
SKW5457 - 5 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5599 MKE → IAH Jul 26, 21:25 UTCJul 26, 22:15 UTC50m
2026-07-26 SKW5507 GSO → DEN Jul 26, 17:55 UTCJul 26, 20:05 UTC2h 10m
2026-07-26 SKW5507 GSO → DEN Jul 26, 18:04 UTCJul 26, 20:11 UTC2h 7m
2026-07-26 SKW5295 BHM → DEN Jul 26, 13:30 UTCJul 26, 15:55 UTC2h 25m
2026-07-26 SKW5815 DEN → BHM Jul 26, 00:35 UTCJul 26, 03:00 UTC2h 25m
2026-07-25 SKW5846 ORD → SDF Jul 25, 20:30 UTCJul 25, 22:35 UTC2h 5m
2026-07-25 SKW5846 ORD → SDF Jul 25, 20:32 UTCJul 25, 22:34 UTC2h 2m
2026-07-25 SKW4689 LAX → SFO Jul 25, 18:35 UTCJul 25, 19:25 UTC50m
2026-07-25 SKW5803 SHV → IAH Jul 25, 14:50 UTCJul 25, 17:15 UTC2h 25m
2026-07-25 SKW5803 SHV → IAH Jul 25, 14:47 UTCJul 25, 17:06 UTC2h 19m
2026-07-25 SKW5597 DEN → ASE Jul 25, 01:10 UTCJul 25, 02:35 UTC1h 25m
2026-07-25 SKW5597 DEN → ASE Jul 25, 01:05 UTCJul 25, 02:48 UTC1h 43m
2026-07-24 SKW5578 YYZ → ORD Jul 24, 21:50 UTCJul 24, 23:30 UTC1h 40m
2026-07-24 SKW5578 YYZ → ORD Jul 24, 21:55 UTCJul 24, 23:21 UTC1h 26m
2026-07-24 SKW463C DEN → PSC Jul 24, 17:33 UTCJul 24, 19:34 UTC2h 1m
2026-07-24 SKW463C DEN → PSC Jul 24, 17:35 UTCJul 24, 19:35 UTC2h 0m
2026-07-24 SKW5295 BHM → DEN Jul 24, 13:25 UTCJul 24, 16:05 UTC2h 40m
2026-07-24 SKW5815 DEN → BHM Jul 24, 00:25 UTCJul 24, 02:50 UTC2h 25m
2026-07-23 SKW5515 GSP → DEN Jul 23, 21:14 UTCJul 23, 23:11 UTC1h 57m
2026-07-23 SKW5515 GSP → DEN Jul 23, 21:00 UTCJul 23, 23:10 UTC2h 10m
2026-07-23 SKW5510 LAX → SBP Jul 23, 18:45 UTCJul 23, 20:05 UTC1h 20m
2026-07-23 SKW5519 ORD → DLH Jul 23, 16:37 UTCJul 23, 17:20 UTC43m
2026-07-23 SKW5519 ORD → DLH Jul 23, 16:20 UTCJul 23, 17:25 UTC1h 5m
2026-07-23 SKW5508 PWM → ORD Jul 23, 02:15 UTCJul 23, 03:30 UTC1h 15m
2026-07-23 SKW4786 - Jul 23, 00:05 UTCJul 23, 01:05 UTC1h 0m
2026-07-22 SKW5312 IAH → MSY Jul 22, 21:05 UTCJul 22, 22:00 UTC55m
2026-07-22 SKW5312 IAH → MSY Jul 22, 21:04 UTCJul 22, 22:08 UTC1h 4m
2026-07-22 SKW5248 MFR → SFO Jul 22, 19:30 UTCJul 22, 20:05 UTC35m
2026-07-22 SKW5372 BUR → SFO Jul 22, 16:45 UTCJul 22, 17:45 UTC1h 0m
2026-07-22 SKW5542 SDF → ORD Jul 22, 14:45 UTCJul 22, 15:05 UTC20m
2026-07-22 SKW5542 SDF → ORD Jul 22, 14:41 UTCJul 22, 14:56 UTC15m
2026-07-22 SKW5461 DEN → XWA Jul 22, 04:35 UTCJul 22, 04:55 UTC20m
2026-07-22 SKW4722 SMF → SFO Jul 22, 02:15 UTCJul 22, 03:20 UTC1h 5m
2026-07-22 SKW4722 SMF → SFO Jul 22, 02:11 UTCJul 22, 03:12 UTC1h 1m
2026-07-21 SKW5457 - Jul 21, 23:35 UTCJul 22, 00:35 UTC1h 0m
2026-07-21 SKW5523 ORD → MSN Jul 21, 20:55 UTCJul 21, 21:55 UTC1h 0m
2026-07-21 SKW5523 ORD → MSN Jul 21, 21:09 UTCJul 21, 21:48 UTC39m
2026-07-21 SKW5438 DEN → MRY Jul 21, 17:50 UTCJul 21, 18:15 UTC25m
2026-07-21 SKW5438 DEN → MRY Jul 21, 17:39 UTCJul 21, 19:51 UTC2h 12m
2026-07-21 SKW4640 - Jul 21, 13:25 UTCJul 21, 16:05 UTC2h 40m
2026-07-21 SKW4640 HSV → DEN Jul 21, 13:15 UTCJul 21, 15:50 UTC2h 35m
2026-07-21 SKW5356 FAT → SFO Jul 21, 00:35 UTCJul 21, 02:45 UTC2h 10m
2026-07-20 SKW4702 BFL → DEN Jul 20, 19:50 UTCJul 20, 22:00 UTC2h 10m
2026-07-20 SKW4671 BFL → SFO Jul 20, 18:00 UTCJul 20, 18:45 UTC45m
2026-07-20 SKW6046 SFO → STL Jul 20, 15:05 UTCJul 20, 16:55 UTC1h 50m
2026-07-20 SK6044 - Jul 20, 06:10 UTCJul 20, 07:30 UTC1h 20m
2026-07-20 SKW6042 IAH → ABQ Jul 20, 03:15 UTCJul 20, 05:15 UTC2h 0m
2026-07-19 SKW4753 OAK → GEG Jul 19, 23:45 UTCJul 20, 01:15 UTC1h 30m
2026-07-19 SKW4753 SFO → GEG Jul 19, 23:43 UTCJul 20, 01:12 UTC1h 29m
2026-07-19 SKW5599 MKE → IAH Jul 19, 21:35 UTCJul 19, 22:40 UTC1h 5m

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 N606UX page for operator, model, and routing details .

Mode-S A7DF61 frequently asked

What is Mode-S code A7DF61?
A7DF61 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N606UX.
Where is Mode-S A7DF61 registered?
Mode-S code A7DF61 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A7DF61 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A7DF61, octal 51757541, decimal 11,001,697.
What flights does A7DF61 operate?
Mode-S A7DF61 has broadcast 20 distinct callsigns, including SKW5290, SKW5975, SKW5484, SKW6013, SKW5985.