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sensors Mode-S transponder

A84E3F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N634SY · EMBRAER ERJ-170-100 · operated by SKYWEST AIRLINES INC

Hex
A84E3F
Octal
52047077
Decimal
11,030,079
Country
US
Tail
N634SY
Type
E170
No current signal · last broadcast Jul 26, 18:20 UTC
Flights observed
662
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:20 UTC

Last known position

Most recent position reported by Mode-S A84E3F.

Country allocation

The ICAO 24-bit address A84E3F 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
SKW4669 - 21 2026-07-10
SKW5254 - 17 2026-07-10
SKW5524 - 15 2026-07-05
SKW5403 - 14 2026-07-04
SKW5300 - 14 2026-07-03
SKW5780 - 12 2026-07-03
SKW5493 - 12 2026-07-02
SKW5684 SkyWest Airlines 10 2026-04-28
SKW5674 SkyWest Airlines 10 2026-04-28
SKW5781 - 9 2026-07-06
SKW5529 - 9 2026-07-17
SKW5520 - 9 2026-07-17
SKW5814 - 8 2026-07-14
SKW5778 - 8 2026-07-21
SKW5711 SkyWest Airlines 8 2026-07-25
SKW5697 SkyWest Airlines 8 2026-07-26
SKW5553 - 8 2026-07-12
SKW5503 SkyWest Airlines 8 2026-04-28
SKW5259 - 8 2026-07-14
SKW5917 - 7 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5769 XNA → ORD Jul 26, 17:55 UTCJul 26, 18:20 UTC25m
2026-07-26 SKW5766 ASE → DEN Jul 26, 13:55 UTCJul 26, 14:20 UTC25m
2026-07-26 SKW5697 SFO → BUR Jul 26, 03:50 UTCJul 26, 04:10 UTC20m
2026-07-26 SKW5697 SFO → BUR Jul 26, 03:55 UTCJul 26, 04:21 UTC26m
2026-07-26 SKW5607 TVC → DEN Jul 26, 02:25 UTCJul 26, 02:45 UTC20m
2026-07-25 SKW4700 FAT → SFO Jul 25, 17:40 UTCJul 25, 19:25 UTC1h 45m
2026-07-25 SKW5740 SFO → ONT Jul 25, 14:25 UTCJul 25, 15:55 UTC1h 30m
2026-07-25 SKW5711 PHL → ORD Jul 25, 00:45 UTCJul 25, 02:20 UTC1h 35m
2026-07-25 SKW5711 PHL → ORD Jul 25, 00:44 UTCJul 25, 02:34 UTC1h 50m
2026-07-24 SKW5560 ORD → CMH Jul 24, 23:00 UTCJul 24, 23:45 UTC45m
2026-07-24 SKW5854 ORD → MSN Jul 24, 20:15 UTCJul 24, 20:40 UTC25m
2026-07-24 SKW5745 ASE → SFO Jul 24, 17:05 UTCJul 24, 18:55 UTC1h 50m
2026-07-24 SKW5711 PHL → ORD Jul 24, 00:40 UTCJul 24, 02:10 UTC1h 30m
2026-07-23 SKW4655 ACV → SFO Jul 23, 22:40 UTCJul 23, 23:35 UTC55m
2026-07-23 SKW4655 ACV → SFO Jul 23, 22:30 UTCJul 23, 23:33 UTC1h 3m
2026-07-23 SKW5506 SFO → ASE Jul 23, 18:55 UTCJul 23, 21:05 UTC2h 10m
2026-07-23 SKW5455 - Jul 23, 14:00 UTCJul 23, 16:00 UTC2h 0m
2026-07-23 SKW5600 RNO → SFO Jul 23, 01:00 UTCJul 23, 02:35 UTC1h 35m
2026-07-21 SKW5766 - Jul 21, 14:00 UTCJul 21, 14:25 UTC25m
2026-07-21 SKW5779 - Jul 21, 02:15 UTCJul 21, 02:35 UTC20m
2026-07-21 SKW5778 - Jul 21, 00:30 UTCJul 21, 01:00 UTC30m
2026-07-20 SKW5773 BNA → ORD Jul 20, 22:00 UTCJul 20, 22:40 UTC40m
2026-07-20 SKW5774 ASE → DEN Jul 20, 19:45 UTCJul 20, 20:10 UTC25m
2026-07-20 SKW5769 - Jul 20, 18:05 UTCJul 20, 18:20 UTC15m
2026-07-20 SKW5770 - Jul 20, 15:50 UTCJul 20, 16:15 UTC25m
2026-07-20 SKW5444 - Jul 20, 14:20 UTCJul 20, 14:35 UTC15m
2026-07-20 SKW5895 - Jul 20, 11:05 UTCJul 20, 12:35 UTC1h 30m
2026-07-20 SKW5687 OKC → IAH Jul 20, 03:05 UTCJul 20, 04:25 UTC1h 20m
2026-07-20 SKW5687 OKC → IAH Jul 20, 03:03 UTCJul 20, 04:27 UTC1h 24m
2026-07-20 SKW5736 SLC → SFO Jul 20, 00:06 UTCJul 20, 01:18 UTC1h 12m
2026-07-19 SKW5736 SLC → SFO Jul 19, 21:40 UTCJul 20, 01:25 UTC3h 45m
2026-07-19 SKW5774 ASE → DEN Jul 19, 19:55 UTCJul 19, 20:20 UTC25m
2026-07-19 SKW5774 ASE → DEN Jul 19, 19:32 UTCJul 19, 20:19 UTC47m
2026-07-19 SKW5769 - Jul 19, 18:10 UTCJul 19, 18:20 UTC10m
2026-07-19 SKW4687 ASE → DEN Jul 19, 14:58 UTCJul 19, 15:08 UTC10m
2026-07-19 SKW5711 - Jul 19, 01:00 UTCJul 19, 02:40 UTC1h 40m
2026-07-19 SKW5711 SFO → ASE Jul 19, 00:15 UTCJul 19, 03:05 UTC2h 50m
2026-07-18 SKW5560 - Jul 18, 22:25 UTCJul 18, 23:10 UTC45m
2026-07-18 SKW5854 ORD → MSN Jul 18, 20:05 UTCJul 18, 20:30 UTC25m
2026-07-18 SKW5854 ORD → MSN Jul 18, 19:59 UTCJul 18, 20:43 UTC44m
2026-07-18 SKW5745 - Jul 18, 15:55 UTCJul 18, 17:35 UTC1h 40m
2026-07-18 SKW5745 ASE → SFO Jul 18, 16:05 UTCJul 18, 17:34 UTC1h 29m
2026-07-18 SKW5444 - Jul 18, 14:00 UTCJul 18, 14:15 UTC15m
2026-07-18 SKW4777 - Jul 18, 11:25 UTCJul 18, 12:45 UTC1h 20m
2026-07-18 SKW4777 DSM → DEN Jul 18, 11:30 UTCJul 18, 12:46 UTC1h 16m
2026-07-18 SKW5389 SAN → SFO Jul 18, 03:10 UTCJul 18, 04:30 UTC1h 20m
2026-07-18 SKW5694 GRB → ORD Jul 18, 00:39 UTCJul 18, 02:09 UTC1h 30m
2026-07-17 SKW5641 DEN → XNA Jul 17, 22:10 UTCJul 17, 23:35 UTC1h 25m
2026-07-17 SKW5520 CLD → DEN Jul 17, 19:09 UTCJul 17, 21:10 UTC2h 0m
2026-07-17 SKW5520 CLD → DEN Jul 17, 19:10 UTCJul 17, 21:01 UTC1h 51m

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 N634SY page for operator, model, and routing details .

Mode-S A84E3F frequently asked

What is Mode-S code A84E3F?
A84E3F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N634SY.
Where is Mode-S A84E3F registered?
Mode-S code A84E3F 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 A84E3F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A84E3F, octal 52047077, decimal 11,030,079.
What flights does A84E3F operate?
Mode-S A84E3F has broadcast 20 distinct callsigns, including SKW4669, SKW5254, SKW5524, SKW5403, SKW5300.