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sensors Mode-S transponder

A19B18

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N202SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A19B18
Octal
50315430
Decimal
10,591,000
Country
US
Tail
N202SY
Type
E75L
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
544
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S A19B18.

Country allocation

The ICAO 24-bit address A19B18 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
SKW5593 - 9 2026-07-11
SKW5525 - 6 2026-07-11
SKW5465 SkyWest Airlines 6 2026-07-25
SKW5812 SkyWest Airlines 5 2026-05-16
SKW5811 SkyWest Airlines 5 2026-07-26
SKW5810 SkyWest Airlines 5 2026-06-03
SKW5765 - 5 2026-07-11
SKW5687 - 5 2026-07-02
SKW5574 SkyWest Airlines 5 2026-07-26
SKW5533 - 5 2026-07-16
SKW5267 SkyWest Airlines 5 2026-05-16
SKW5244 - 5 2026-06-22
SKW6027 SkyWest Airlines 4 2026-06-03
SKW6020 SkyWest Airlines 4 2026-06-03
SKW6004 SkyWest Airlines 4 2026-07-26
SKW5840 SkyWest Airlines 4 2026-05-24
SKW5659 - 4 2026-07-16
SKW5639 SkyWest Airlines 4 2026-05-30
SKW5475 - 4 2026-06-25
SKW5451 SkyWest Airlines 4 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW6004 ORD → SUN Jul 26, 19:50 UTCJul 26, 22:00 UTC2h 10m
2026-07-26 SKW5574 SJC → LAX Jul 26, 15:50 UTCJul 26, 18:25 UTC2h 35m
2026-07-26 SKW5811 BOS → ORD Jul 26, 12:25 UTCJul 26, 14:00 UTC1h 35m
2026-07-26 SKW5811 BOS → ORD Jul 26, 12:22 UTCJul 26, 14:02 UTC1h 40m
2026-07-26 SKW5331 IAH → CMH Jul 26, 02:45 UTCJul 26, 04:35 UTC1h 50m
2026-07-26 SKW5483 MSP → SFO Jul 26, 00:00 UTCJul 26, 00:27 UTC27m
2026-07-25 SKW5483 MSP → SFO Jul 25, 23:50 UTCJul 26, 00:35 UTC45m
2026-07-25 SKW5954 DEN → TUS Jul 25, 21:35 UTCJul 25, 22:30 UTC55m
2026-07-25 SKW5954 DEN → TUS Jul 25, 21:40 UTCJul 25, 22:25 UTC45m
2026-07-25 SKW5465 ORD → HPN Jul 25, 17:40 UTCJul 25, 19:30 UTC1h 50m
2026-07-25 SKW5326 BUR → SFO Jul 25, 15:15 UTCJul 25, 16:50 UTC1h 35m
2026-07-25 SKW4728 COU → ORD Jul 25, 10:25 UTCJul 25, 11:55 UTC1h 30m
2026-07-24 SKW5275 SUN → SFO Jul 24, 23:50 UTCJul 25, 01:10 UTC1h 20m
2026-07-24 SKW5210 ORD → ROA Jul 24, 20:25 UTCJul 24, 22:20 UTC1h 55m
2026-07-23 SKW5451 SFO → BFL Jul 23, 20:05 UTCJul 23, 21:45 UTC1h 40m
2026-07-23 SKW5451 SFO → BFL Jul 23, 20:04 UTCJul 23, 21:30 UTC1h 26m
2026-07-23 SKW5434 - Jul 23, 15:40 UTCJul 23, 17:50 UTC2h 10m
2026-07-23 SKW4672 - Jul 23, 12:30 UTCJul 23, 14:25 UTC1h 55m
2026-07-22 SKW5364 OKC → ORD Jul 22, 12:30 UTCJul 22, 14:10 UTC1h 40m
2026-07-22 SKW5364 OKC → ORD Jul 22, 12:25 UTCJul 22, 14:04 UTC1h 39m
2026-07-22 SKW5392 LAX → SFO Jul 22, 02:25 UTCJul 22, 04:05 UTC1h 40m
2026-07-21 SKW5702 ASE → ORD Jul 21, 21:40 UTCJul 22, 00:05 UTC2h 25m
2026-07-21 SKW4703 - Jul 21, 16:25 UTCJul 21, 18:10 UTC1h 45m
2026-07-21 SKW4803 BUR → SFO Jul 21, 13:05 UTCJul 21, 13:30 UTC25m
2026-07-21 SKW5362 ORD → PIA Jul 21, 03:35 UTCJul 21, 03:50 UTC15m
2026-07-21 SKW4679 BNA → ORD Jul 21, 00:15 UTCJul 21, 01:35 UTC1h 20m
2026-07-20 SKW5665 DEN → SLC Jul 20, 21:50 UTCJul 20, 23:05 UTC1h 15m
2026-07-20 SKW5419 SBA → SFO Jul 20, 18:00 UTCJul 20, 18:45 UTC45m
2026-07-20 SKW5419 SBA → SFO Jul 20, 17:49 UTCJul 20, 18:29 UTC40m
2026-07-20 SKW5968 - Jul 20, 15:50 UTCJul 20, 16:25 UTC35m
2026-07-20 SKW5364 OKC → ORD Jul 20, 12:25 UTCJul 20, 14:15 UTC1h 50m
2026-07-19 SKW5278 HPN → ORD Jul 19, 23:30 UTCJul 20, 00:35 UTC1h 5m
2026-07-19 SKW5798 - Jul 19, 20:35 UTCJul 19, 21:55 UTC1h 20m
2026-07-19 SKW5414 FAR → DEN Jul 19, 18:05 UTCJul 19, 19:15 UTC1h 10m
2026-07-19 SKW4656 - Jul 19, 15:00 UTCJul 19, 16:35 UTC1h 35m
2026-07-19 SKW5601 - Jul 19, 12:45 UTCJul 19, 14:00 UTC1h 15m
2026-07-18 SKW6004 ORD → SUN Jul 18, 22:05 UTCJul 19, 01:15 UTC3h 10m
2026-07-18 SKW6004 ORD → SUN Jul 18, 20:09 UTCJul 19, 01:01 UTC4h 52m
2026-07-18 SKW5574 - Jul 18, 16:25 UTCJul 18, 18:00 UTC1h 35m
2026-07-18 SKW5574 ORD → YHZ Jul 18, 16:23 UTCJul 18, 18:53 UTC2h 30m
2026-07-18 SKW5501 - Jul 18, 13:25 UTCJul 18, 14:40 UTC1h 15m
2026-07-18 SKW5501 LIT → ORD Jul 18, 13:31 UTCJul 18, 14:37 UTC1h 6m
2026-07-18 SKW5228 - Jul 18, 04:05 UTCJul 18, 05:15 UTC1h 10m
2026-07-17 SKW5524 - Jul 17, 23:55 UTCJul 18, 01:25 UTC1h 30m
2026-07-17 SKW5524 GSP → ORD Jul 17, 23:48 UTCJul 18, 01:20 UTC1h 32m
2026-07-17 SKW5403 - Jul 17, 20:40 UTCJul 17, 22:20 UTC1h 40m
2026-07-17 SKW5403 ORD → GSP Jul 17, 20:06 UTCJul 17, 22:06 UTC2h 0m
2026-07-17 SKW5204 - Jul 17, 16:40 UTCJul 17, 18:34 UTC1h 55m
2026-07-17 SKW5204 ALB → ORD Jul 17, 16:14 UTCJul 17, 18:37 UTC2h 23m
2026-07-16 SKW5451 - Jul 16, 19:45 UTCJul 16, 21:25 UTC1h 40m

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 N202SY page for operator, model, and routing details .

Mode-S A19B18 frequently asked

What is Mode-S code A19B18?
A19B18 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N202SY.
Where is Mode-S A19B18 registered?
Mode-S code A19B18 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 A19B18 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A19B18, octal 50315430, decimal 10,591,000.
What flights does A19B18 operate?
Mode-S A19B18 has broadcast 20 distinct callsigns, including SKW5593, SKW5525, SKW5465, SKW5812, SKW5811.