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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
Broadcasting now · callsign SKW5533 · 32,000 ft
Flights observed
486
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

A19B18 is currently broadcasting. Map zoomed to live position.

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
SKW5812 SkyWest Airlines 5 2026-05-16
SKW5810 SkyWest Airlines 5 2026-06-03
SKW5765 - 5 2026-07-11
SKW5687 - 5 2026-07-02
SKW5465 SkyWest Airlines 5 2026-05-28
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
SKW5840 SkyWest Airlines 4 2026-05-24
SKW5639 SkyWest Airlines 4 2026-05-30
SKW5475 - 4 2026-06-25
SKW5429 SkyWest Airlines 4 2026-06-05
SKW5367 SkyWest Airlines 4 2026-06-23
SKW5325 - 4 2026-07-06
SKW5324 - 4 2026-07-03
SKW6052 SkyWest Airlines 3 2026-05-11
SKW6005 SkyWest Airlines 3 2026-06-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 SKW5533 - Jul 15, 01:50 UTCJul 15, 02:00 UTC10m
2026-07-14 SKW5929 - Jul 14, 22:00 UTCJul 14, 22:55 UTC54m
2026-07-14 SKW5412 - Jul 14, 20:05 UTCJul 14, 21:00 UTC55m
2026-07-14 SKW5412 ORD → SDF Jul 14, 20:04 UTCJul 14, 20:57 UTC53m
2026-07-14 SKW5672 - Jul 14, 16:10 UTCJul 14, 17:35 UTC1h 25m
2026-07-14 SKW5360 - Jul 14, 13:50 UTCJul 14, 15:05 UTC1h 15m
2026-07-14 SKW5453 OKC → IAH Jul 14, 10:18 UTCJul 14, 11:27 UTC1h 9m
2026-07-14 SKW5453 - Jul 14, 10:15 UTCJul 14, 11:20 UTC1h 5m
2026-07-14 SKW4727 DEN → OKC Jul 14, 03:00 UTCJul 14, 04:04 UTC1h 4m
2026-07-14 SKW4727 DEN → OKC Jul 14, 02:55 UTCJul 14, 04:05 UTC1h 10m
2026-07-13 SKW5694 - Jul 13, 22:20 UTCJul 13, 23:45 UTC1h 25m
2026-07-13 SKW5641 DEN → XNA Jul 13, 19:40 UTCJul 13, 21:05 UTC1h 25m
2026-07-13 SKW5594 - Jul 13, 16:55 UTCJul 13, 18:05 UTC1h 10m
2026-07-13 SKW5594 OMA → DEN Jul 13, 16:44 UTCJul 13, 18:04 UTC1h 20m
2026-07-13 SKW5443 - Jul 13, 14:20 UTCJul 13, 15:35 UTC1h 15m
2026-07-13 SKW5545 - Jul 13, 10:10 UTCJul 13, 11:55 UTC1h 45m
2026-07-13 SKW5545 MSN → DEN Jul 13, 10:19 UTCJul 13, 11:56 UTC1h 37m
2026-07-13 SKW5214 DEN → MSN Jul 13, 03:05 UTCJul 13, 05:01 UTC1h 55m
2026-07-12 SKW5544 - Jul 12, 23:10 UTCJul 13, 01:10 UTC2h 0m
2026-07-12 SKW4802 - Jul 12, 20:05 UTCJul 12, 21:55 UTC1h 50m
2026-07-12 SKW5288 - Jul 12, 16:50 UTCJul 12, 18:10 UTC1h 20m
2026-07-12 SKW4801 DEN → DSM Jul 12, 14:05 UTCJul 12, 15:30 UTC1h 25m
2026-07-12 SKW5701 FSD → DEN Jul 12, 11:05 UTCJul 12, 12:15 UTC1h 10m
2026-07-12 SKW309L DEN → FSD Jul 12, 03:30 UTCJul 12, 04:40 UTC1h 10m
2026-07-11 SKW5260 - Jul 11, 21:45 UTCJul 11, 23:40 UTC1h 55m
2026-07-11 SKW5765 IAH → SHV Jul 11, 19:47 UTCJul 11, 20:41 UTC54m
2026-07-11 SKW5525 - Jul 11, 17:00 UTCJul 11, 18:40 UTC1h 40m
2026-07-11 SKW5525 MEM → IAH Jul 11, 17:01 UTCJul 11, 18:23 UTC1h 22m
2026-07-11 SKW5593 - Jul 11, 14:35 UTCJul 11, 15:50 UTC1h 15m
2026-07-11 SKW5820 - Jul 11, 11:10 UTCJul 11, 12:35 UTC1h 25m
2026-07-11 SKW5763 ORD → BUF Jul 11, 00:00 UTCJul 11, 01:05 UTC1h 5m
2026-07-10 SKW5382 - Jul 10, 19:40 UTCJul 10, 21:00 UTC1h 20m
2026-07-10 SKW5321 - Jul 10, 17:40 UTCJul 10, 18:30 UTC50m
2026-07-10 SKW5321 IAH → LIT Jul 10, 17:13 UTCJul 10, 18:37 UTC1h 24m
2026-07-10 SKW5283 - Jul 10, 00:20 UTCJul 10, 14:50 UTC14h 30m
2026-07-09 SKW5837 - Jul 9, 20:45 UTCJul 9, 21:20 UTC35m
2026-07-09 SKW5837 SHV → IAH Jul 9, 20:48 UTCJul 9, 21:20 UTC32m
2026-07-09 SKW5253 - Jul 9, 17:05 UTCJul 9, 18:50 UTC1h 45m
2026-07-09 SKW5558 - Jul 9, 13:30 UTCJul 9, 15:55 UTC2h 25m
2026-07-09 SKW5558 MKE → DEN Jul 9, 13:33 UTCJul 9, 15:56 UTC2h 23m
2026-07-09 SKW5297 - Jul 9, 02:55 UTCJul 9, 05:05 UTC2h 10m
2026-07-09 SKW5297 IAH → MKE Jul 9, 02:57 UTCJul 9, 05:05 UTC2h 8m
2026-07-08 SKW5238 ORD → BNA Jul 8, 23:25 UTCJul 9, 02:00 UTC2h 35m
2026-07-08 SKW416K - Jul 8, 18:40 UTCJul 8, 21:05 UTC2h 25m
2026-07-08 SKW5373 - Jul 8, 15:15 UTCJul 8, 17:25 UTC2h 10m
2026-07-08 SKW5192 - Jul 8, 13:50 UTCJul 8, 14:10 UTC20m
2026-07-08 SKW4667 - Jul 8, 10:05 UTCJul 8, 12:20 UTC2h 15m
2026-07-07 SKW5681 ORD → BGR Jul 7, 23:50 UTCJul 8, 02:00 UTC2h 10m
2026-07-07 SKW4795 - Jul 7, 19:35 UTCJul 7, 21:05 UTC1h 30m
2026-07-07 SKW4795 TUL → ORD Jul 7, 19:30 UTCJul 7, 20:49 UTC1h 19m

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?
Yes. Mode-S A19B18 is currently airborne.
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, SKW5812, SKW5810, SKW5765.