Apparatus

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sensors Mode-S transponder

A81815

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N620UX · EMBRAER ERJ-170-200 (long wing) · operated by UNITED AIRLINES INC

Hex
A81815
Octal
52014025
Decimal
11,016,213
Country
US
Tail
N620UX
Type
E75L
Broadcasting now · callsign SKW4720 · 25,150 ft
Flights observed
647
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:20 UTC

Current position

A81815 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A81815 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
SKW5901 - 7 2026-06-18
SKW5645 SkyWest Airlines 7 2026-06-16
SKW5601 - 6 2026-06-19
SKW5290 - 6 2026-06-21
SKW5747 SkyWest Airlines 5 2026-06-16
SKW5577 - 5 2026-07-12
SKW5384 SkyWest Airlines 5 2026-07-25
SKW5382 - 5 2026-06-15
SKW5355 - 5 2026-07-19
SKW5256 SkyWest Airlines 5 2026-06-08
SKW4747 SkyWest Airlines 5 2026-05-06
SKW4703 SkyWest Airlines 5 2026-06-12
SKW4656 SkyWest Airlines 5 2026-06-19
SKW4643 - 5 2026-07-25
SKW789C SkyWest Airlines 4 2026-07-23
SKW717C SkyWest Airlines 4 2026-06-03
SKW5970 SkyWest Airlines 4 2026-07-22
SKW5936 - 4 2026-07-12
SKW5877 - 4 2026-04-13
SKW5857 SkyWest Airlines 4 2026-05-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5899 RNO → SFO Jul 26, 19:00 UTCJul 26, 20:00 UTC1h 0m
2026-07-26 SKW5410 PSP → SFO Jul 26, 16:50 UTCJul 26, 17:45 UTC55m
2026-07-26 SKW4730 - Jul 26, 14:10 UTCJul 26, 15:20 UTC1h 10m
2026-07-26 SKW4730 - Jul 26, 13:25 UTCJul 26, 13:40 UTC15m
2026-07-26 SKW5363 SYR → ORD Jul 26, 02:10 UTCJul 26, 03:35 UTC1h 25m
2026-07-25 SKW4653 DEN → DAY Jul 25, 22:55 UTCJul 26, 00:30 UTC1h 35m
2026-07-25 SKW4653 DEN → DAY Jul 25, 22:49 UTCJul 26, 00:23 UTC1h 34m
2026-07-25 SKW5590 SFO → SLC Jul 25, 20:00 UTCJul 25, 21:25 UTC1h 25m
2026-07-25 SKW5590 SFO → SLC Jul 25, 20:05 UTCJul 25, 21:33 UTC1h 28m
2026-07-25 SKW5384 ORD → TUL Jul 25, 18:10 UTCJul 25, 18:50 UTC40m
2026-07-25 SKW4643 - Jul 25, 16:25 UTCJul 25, 16:55 UTC30m
2026-07-25 SKW4642 BIS → DEN Jul 25, 11:20 UTCJul 25, 14:00 UTC2h 40m
2026-07-25 SKW418W LAX → AUS Jul 25, 01:55 UTCJul 25, 04:50 UTC2h 55m
2026-07-25 SKW418W LAX → AUS Jul 25, 01:57 UTCJul 25, 04:45 UTC2h 48m
2026-07-24 SKW5718 PSP → SFO Jul 24, 23:00 UTCJul 24, 23:55 UTC55m
2026-07-24 SKW5548 COS → DEN Jul 24, 20:15 UTCJul 24, 21:20 UTC1h 5m
2026-07-24 SKW5384 ORD → TUL Jul 24, 18:10 UTCJul 24, 18:35 UTC25m
2026-07-24 SKW4643 - Jul 24, 16:40 UTCJul 24, 17:10 UTC30m
2026-07-24 SKW4642 BIS → DEN Jul 24, 11:15 UTCJul 24, 13:50 UTC2h 35m
2026-07-24 SKW418W LAX → AUS Jul 24, 02:05 UTCJul 24, 05:00 UTC2h 55m
2026-07-23 SKW319U ACV → LAX Jul 23, 23:00 UTCJul 24, 00:30 UTC1h 30m
2026-07-23 SKW319U ACV → LAX Jul 23, 22:59 UTCJul 24, 00:24 UTC1h 25m
2026-07-23 SKW789C LAX → ACV Jul 23, 20:15 UTCJul 23, 21:15 UTC1h 0m
2026-07-23 SKW789C LAX → ACV Jul 23, 20:00 UTCJul 23, 21:39 UTC1h 39m
2026-07-23 SKW5328 - Jul 23, 17:50 UTCJul 23, 18:55 UTC1h 5m
2026-07-23 SKW5394 - Jul 23, 15:50 UTCJul 23, 16:15 UTC25m
2026-07-23 SKW5394 SFO → RNO Jul 23, 15:39 UTCJul 23, 16:23 UTC44m
2026-07-23 SKW4678 - Jul 23, 12:45 UTCJul 23, 14:25 UTC1h 40m
2026-07-23 SKW5387 MTY → ORD Jul 23, 00:20 UTCJul 23, 01:15 UTC55m
2026-07-23 SKW5387 MTY → ORD Jul 23, 00:15 UTCJul 23, 01:29 UTC1h 14m
2026-07-22 SKW5970 SLC → SFO Jul 22, 21:30 UTCJul 22, 23:05 UTC1h 35m
2026-07-22 SKW6099 DSM → MKE Jul 22, 19:10 UTCJul 22, 20:20 UTC1h 10m
2026-07-22 SKW6099 DSM → MKE Jul 22, 19:14 UTCJul 22, 20:07 UTC53m
2026-07-22 SKW5594 PSC → SFO Jul 22, 16:35 UTCJul 22, 17:05 UTC30m
2026-07-22 SKW5594 PSC → SFO Jul 22, 16:44 UTCJul 22, 17:45 UTC1h 1m
2026-07-22 SKW5443 BHM → ORD Jul 22, 14:30 UTCJul 22, 15:50 UTC1h 20m
2026-07-22 SKW5969 SFO → SEA Jul 22, 11:10 UTCJul 22, 12:20 UTC1h 10m
2026-07-22 SKW5269 DEN → SJC Jul 22, 02:45 UTCJul 22, 04:10 UTC1h 25m
2026-07-21 SKW4721 CMH → ORD Jul 21, 19:25 UTCJul 21, 21:15 UTC1h 50m
2026-07-21 SKW4717 ABQ → SFO Jul 21, 16:41 UTCJul 21, 17:54 UTC1h 13m
2026-07-21 SKW4717 ABQ → SFO Jul 21, 16:35 UTCJul 21, 17:50 UTC1h 15m
2026-07-21 SKW5323 ORD → JAX Jul 21, 13:25 UTCJul 21, 15:25 UTC2h 0m
2026-07-21 SKW5693 SFO → SBP Jul 21, 04:00 UTCJul 21, 05:30 UTC1h 30m
2026-07-21 SKW5349 SGF → ORD Jul 21, 01:55 UTCJul 21, 02:25 UTC30m
2026-07-21 SKW5349 SGF → ORD Jul 21, 01:59 UTCJul 21, 02:21 UTC22m
2026-07-20 SKW4806 - Jul 20, 22:40 UTCJul 21, 00:35 UTC1h 55m
2026-07-20 SKW4686 - Jul 20, 19:30 UTCJul 20, 21:05 UTC1h 35m
2026-07-20 SKW5369 - Jul 20, 15:55 UTCJul 20, 17:30 UTC1h 35m
2026-07-20 SKW4660 HLN → DEN Jul 20, 12:45 UTCJul 20, 13:50 UTC1h 5m
2026-07-20 SKW4705 DEN → HLN Jul 20, 01:40 UTCJul 20, 13:50 UTC12h 10m

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 N620UX page for operator, model, and routing details .

Mode-S A81815 frequently asked

What is Mode-S code A81815?
A81815 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N620UX.
Where is Mode-S A81815 registered?
Mode-S code A81815 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 A81815 broadcasting right now?
Yes. Mode-S A81815 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A81815, octal 52014025, decimal 11,016,213.
What flights does A81815 operate?
Mode-S A81815 has broadcast 20 distinct callsigns, including SKW5901, SKW5645, SKW5601, SKW5290, SKW5747.