Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A81205

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N619UX · EMBRAER ERJ-170-200 (long wing) · operated by UNITED AIRLINES INC

Hex
A81205
Octal
52011005
Decimal
11,014,661
Country
US
Tail
N619UX
Type
E75L
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
710
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S A81205.

Country allocation

The ICAO 24-bit address A81205 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
SKW5369 - 10 2026-07-09
SKW5261 SkyWest Airlines 10 2026-07-20
SKW5834 - 8 2026-07-18
SKW5602 - 8 2026-07-15
SKW4686 - 8 2026-07-09
SKW5923 SkyWest Airlines 7 2026-07-25
SKW5484 - 7 2026-06-28
SKW5461 SkyWest Airlines 7 2026-07-20
SKW5363 - 7 2026-06-21
SKW4717 SkyWest Airlines 7 2026-07-24
SKW4678 SkyWest Airlines 7 2026-07-26
SKW5996 SkyWest Airlines 6 2026-06-19
SKW5526 - 6 2026-06-21
SKW5487 - 6 2026-07-18
SKW5394 SkyWest Airlines 6 2026-07-26
SKW5328 SkyWest Airlines 6 2026-07-26
SKW5857 SkyWest Airlines 5 2026-06-30
SKW5768 SkyWest Airlines 5 2026-05-06
SKW5662 - 5 2026-07-11
SKW5510 - 5 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5371 FAR → ORD Jul 26, 20:10 UTCJul 26, 21:15 UTC1h 5m
2026-07-26 SKW5328 SBN → ORD Jul 26, 17:25 UTCJul 26, 18:30 UTC1h 5m
2026-07-26 SKW5394 SFO → RNO Jul 26, 15:40 UTCJul 26, 16:10 UTC30m
2026-07-26 SKW4678 BOI → SFO Jul 26, 12:55 UTCJul 26, 14:30 UTC1h 35m
2026-07-26 SKW5644 SFO → BOI Jul 26, 02:10 UTCJul 26, 03:15 UTC1h 5m
2026-07-26 SKW5433 SLC → SFO Jul 26, 00:15 UTCJul 26, 01:15 UTC1h 0m
2026-07-25 SKW5433 SLC → SFO Jul 25, 23:38 UTCJul 26, 01:08 UTC1h 30m
2026-07-25 SKW5471 SFO → ACV Jul 25, 21:15 UTCJul 25, 22:15 UTC1h 0m
2026-07-25 SKW5945 IAH → SLP Jul 25, 19:20 UTCJul 25, 20:15 UTC55m
2026-07-25 SKW5301 LNK → ORD Jul 25, 15:25 UTCJul 25, 16:00 UTC35m
2026-07-25 SKW5301 LNK → ORD Jul 25, 15:36 UTCJul 25, 16:41 UTC1h 5m
2026-07-25 SKW4678 BOI → SFO Jul 25, 12:45 UTCJul 25, 14:30 UTC1h 45m
2026-07-25 SKW5923 DEN → BOI Jul 25, 02:45 UTCJul 25, 04:15 UTC1h 30m
2026-07-24 SKW4721 CMH → ORD Jul 24, 21:20 UTCJul 24, 23:05 UTC1h 45m
2026-07-24 SKW4717 ABQ → SFO Jul 24, 16:55 UTCJul 24, 18:15 UTC1h 20m
2026-07-24 SKW4717 ABQ → SFO Jul 24, 16:56 UTCJul 24, 18:15 UTC1h 19m
2026-07-24 SKW5323 ORD → JAX Jul 24, 13:10 UTCJul 24, 15:25 UTC2h 15m
2026-07-24 SKW5323 ORD → JAX Jul 24, 13:14 UTCJul 24, 15:17 UTC2h 3m
2026-07-24 SKW5693 SFO → SBP Jul 24, 04:05 UTCJul 24, 05:35 UTC1h 30m
2026-07-24 SKW5349 SGF → ORD Jul 24, 02:30 UTCJul 24, 02:55 UTC25m
2026-07-23 SKW4806 ORD → CRW Jul 23, 22:40 UTCJul 24, 00:35 UTC1h 55m
2026-07-23 SKW5292 ORD → MTY Jul 23, 19:30 UTCJul 23, 21:20 UTC1h 50m
2026-07-23 SKW5299 SFO → FAT Jul 23, 17:30 UTCJul 23, 18:00 UTC30m
2026-07-23 SKW4741 DEN → AUS Jul 23, 03:35 UTCJul 23, 15:55 UTC12h 20m
2026-07-23 SKW5647 SJC → DEN Jul 23, 01:35 UTCJul 23, 02:15 UTC40m
2026-07-22 SKW5862 FAR → DEN Jul 22, 23:25 UTCJul 23, 00:15 UTC50m
2026-07-22 SKW5217 SFO → TUS Jul 22, 19:50 UTCJul 22, 21:50 UTC2h 0m
2026-07-22 SKW5612 - Jul 22, 14:50 UTCJul 22, 18:45 UTC3h 55m
2026-07-22 SKW5500 SMF → SFO Jul 22, 11:15 UTCJul 22, 12:40 UTC1h 25m
2026-07-21 SKW5405 ORD → ROA Jul 21, 23:30 UTCJul 22, 00:55 UTC1h 25m
2026-07-21 SKW5405 ORD → ROA Jul 21, 23:45 UTCJul 22, 00:39 UTC54m
2026-07-21 SKW5262 ORD → MKE Jul 21, 21:45 UTCJul 21, 21:55 UTC10m
2026-07-21 SKW5262 ORD → MKE Jul 21, 21:15 UTCJul 21, 21:55 UTC40m
2026-07-21 SKW5262 ORD → MKE Jul 21, 21:07 UTCJul 21, 21:30 UTC23m
2026-07-21 SKW5509 - Jul 21, 19:50 UTCJul 21, 20:15 UTC25m
2026-07-21 SKW5810 - Jul 21, 16:15 UTCJul 21, 17:45 UTC1h 30m
2026-07-21 SKW6020 - Jul 21, 14:10 UTCJul 21, 15:15 UTC1h 5m
2026-07-21 SKW5683 SLC → DEN Jul 21, 11:30 UTCJul 21, 12:40 UTC1h 10m
2026-07-20 SKW5261 ORD → SDF Jul 20, 23:05 UTCJul 21, 00:25 UTC1h 19m
2026-07-20 SKW5261 ORD → SDF Jul 20, 22:47 UTCJul 21, 00:25 UTC1h 38m
2026-07-20 SKW4721 CMH → ORD Jul 20, 19:30 UTCJul 20, 21:35 UTC2h 5m
2026-07-20 SKW4717 ABQ → SFO Jul 20, 16:35 UTCJul 20, 17:55 UTC1h 20m
2026-07-20 SKW4717 ABQ → SFO Jul 20, 16:41 UTCJul 20, 17:57 UTC1h 16m
2026-07-20 SKW6052 ORD → IND Jul 20, 14:15 UTCJul 20, 15:20 UTC1h 5m
2026-07-20 SKW5461 DEN → XWA Jul 20, 04:45 UTCJul 20, 05:05 UTC20m
2026-07-20 SKW5908 - Jul 20, 01:55 UTCJul 20, 03:10 UTC1h 15m
2026-07-20 SKW5908 RNO → LAX Jul 20, 01:52 UTCJul 20, 03:03 UTC1h 11m
2026-07-19 SKW380W LAX → RNO Jul 19, 23:25 UTCJul 20, 00:20 UTC55m
2026-07-19 SKW5307 ASE → SFO Jul 19, 21:10 UTCJul 19, 21:45 UTC35m
2026-07-19 SKW5655 BUR → SFO Jul 19, 17:55 UTCJul 19, 19:40 UTC1h 45m

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 N619UX page for operator, model, and routing details .

Mode-S A81205 frequently asked

What is Mode-S code A81205?
A81205 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N619UX.
Where is Mode-S A81205 registered?
Mode-S code A81205 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 A81205 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A81205, octal 52011005, decimal 11,014,661.
What flights does A81205 operate?
Mode-S A81205 has broadcast 20 distinct callsigns, including SKW5369, SKW5261, SKW5834, SKW5602, SKW4686.