Apparatus

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sensors Mode-S transponder

A6C39F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N535GJ · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A6C39F
Octal
51541637
Decimal
10,929,055
Country
US
Tail
N535GJ
Type
CRJ7
No current signal · last broadcast Jul 26, 20:35 UTC
Flights observed
642
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:35 UTC

Last known position

Most recent position reported by Mode-S A6C39F.

Country allocation

The ICAO 24-bit address A6C39F 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
GJS4442 - 12 2026-07-20
GJS4396 - 10 2026-07-10
GJS4401 GoJet Airlines 9 2026-06-09
GJS4443 GoJet Airlines 8 2026-06-02
GJS4424 - 8 2026-07-07
GJS4393 - 8 2026-07-06
GJS4603 GoJet Airlines 7 2026-07-25
GJS4433 GoJet Airlines 7 2026-06-09
GJS4191 - 7 2026-07-18
GJS4172 - 7 2026-07-20
GJS4604 - 6 2026-07-09
GJS4582 GoJet Airlines 6 2026-06-19
GJS4568 - 6 2026-07-03
GJS4520 - 6 2026-07-13
GJS4440 - 6 2026-07-02
GJS4430 - 6 2026-07-20
GJS4394 GoJet Airlines 6 2026-05-15
GJS4381 GoJet Airlines 6 2026-07-24
GJS4176 - 6 2026-07-11
GJS4566 - 5 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 GJS4429 CVG → IAD Jul 26, 19:50 UTCJul 26, 20:25 UTC35m
2026-07-26 GJS4556 PQI → EWR Jul 26, 17:55 UTCJul 26, 18:20 UTC25m
2026-07-26 GJS4407 EWR → PQI Jul 26, 14:35 UTCJul 26, 16:05 UTC1h 30m
2026-07-26 GJS4596 MDT → ORD Jul 26, 12:25 UTCJul 26, 13:25 UTC1h 0m
2026-07-26 GJS4596 MDT → ORD Jul 26, 12:21 UTCJul 26, 13:26 UTC1h 5m
2026-07-25 GJS4603 MSN → ORD Jul 25, 22:55 UTCJul 25, 23:30 UTC35m
2026-07-25 GJS4603 MSN → ORD Jul 25, 22:59 UTCJul 25, 23:14 UTC15m
2026-07-25 GJS4194 EWR → DCA Jul 25, 21:25 UTCJul 25, 21:55 UTC30m
2026-07-25 GJS4194 EWR → DCA Jul 25, 21:34 UTCJul 25, 21:51 UTC17m
2026-07-25 GJS4571 ICT → ORD Jul 25, 18:15 UTCJul 25, 19:40 UTC1h 25m
2026-07-25 GJS4543 ORD → CMH Jul 25, 15:40 UTCJul 25, 17:15 UTC1h 35m
2026-07-25 GJS4480 DTW → ORD Jul 25, 12:15 UTCJul 25, 13:55 UTC1h 40m
2026-07-25 GJS4480 DTW → ORD Jul 25, 12:29 UTCJul 25, 13:52 UTC1h 23m
2026-07-25 GJS4500 EWR → DCA Jul 25, 01:30 UTCJul 25, 02:40 UTC1h 10m
2026-07-24 GJS4603 MSN → ORD Jul 24, 23:30 UTCJul 25, 00:20 UTC50m
2026-07-24 GJS4603 MSN → ORD Jul 24, 23:05 UTCJul 24, 23:48 UTC43m
2026-07-24 GJS4194 EWR → DCA Jul 24, 21:50 UTCJul 24, 22:20 UTC30m
2026-07-24 GJS4381 STL → ORD Jul 24, 18:10 UTCJul 24, 19:45 UTC1h 35m
2026-07-24 GJS4381 STL → ORD Jul 24, 18:19 UTCJul 24, 19:04 UTC45m
2026-07-24 GJS4382 EWR → DCA Jul 24, 16:00 UTCJul 24, 17:00 UTC1h 0m
2026-07-24 GJS4190 GRR → EWR Jul 24, 13:20 UTCJul 24, 14:15 UTC55m
2026-07-24 GJS4495 GSO → EWR Jul 24, 03:30 UTCJul 24, 04:00 UTC30m
2026-07-24 GJS4483 DAY → ORD Jul 24, 00:35 UTCJul 24, 02:00 UTC1h 25m
2026-07-24 GJS4483 DAY → ORD Jul 24, 00:33 UTCJul 24, 01:42 UTC1h 9m
2026-07-23 GJS4482 BTV → IAD Jul 23, 22:30 UTCJul 23, 23:45 UTC1h 15m
2026-07-23 GJS4482 BTV → IAD Jul 23, 22:37 UTCJul 23, 23:48 UTC1h 11m
2026-07-23 GJS4571 ICT → ORD Jul 23, 19:45 UTCJul 23, 21:05 UTC1h 20m
2026-07-23 GJS4543 ORD → CMH Jul 23, 17:35 UTCJul 23, 18:45 UTC1h 10m
2026-07-23 GJS4480 DTW → ORD Jul 23, 15:00 UTCJul 23, 16:25 UTC1h 25m
2026-07-23 GJS4500 EWR → DCA Jul 23, 01:35 UTCJul 23, 02:40 UTC1h 5m
2026-07-22 GJS4530 ORD → SGF Jul 22, 23:25 UTCJul 22, 23:35 UTC10m
2026-07-22 GJS4530 ORD → SGF Jul 22, 21:55 UTCJul 22, 23:35 UTC1h 40m
2026-07-22 GJS4530 ORD → SGF Jul 22, 22:01 UTCJul 22, 23:07 UTC1h 6m
2026-07-22 GJS4542 ORD → LIT Jul 22, 19:15 UTCJul 22, 20:10 UTC55m
2026-07-22 GJS4410 IAD → LGA Jul 22, 16:25 UTCJul 22, 17:45 UTC1h 20m
2026-07-22 GJS4512 STL → EWR Jul 22, 13:55 UTCJul 22, 15:00 UTC1h 5m
2026-07-21 GJS4547 IAD → PVD Jul 21, 17:05 UTCJul 21, 18:55 UTC1h 50m
2026-07-20 GJS4386 - Jul 20, 23:25 UTCJul 21, 00:20 UTC54m
2026-07-20 GJS4442 - Jul 20, 17:40 UTCJul 20, 18:30 UTC50m
2026-07-20 GJS4442 DCA → EWR Jul 20, 17:17 UTCJul 20, 18:25 UTC1h 8m
2026-07-20 GJS4172 - Jul 20, 15:50 UTCJul 20, 16:30 UTC40m
2026-07-20 GJS4430 DCA → EWR Jul 20, 13:25 UTCJul 20, 14:05 UTC40m
2026-07-20 GJS4430 DCA → EWR Jul 20, 12:50 UTCJul 20, 14:02 UTC1h 12m
2026-07-20 GJS4437 EWR → PHL Jul 20, 11:45 UTCJul 20, 12:00 UTC15m
2026-07-20 GJS4437 EWR → PHL Jul 20, 11:10 UTCJul 20, 11:40 UTC30m
2026-07-20 GJS4384 IAD → YOW Jul 20, 00:55 UTCJul 20, 02:25 UTC1h 30m
2026-07-19 GJS4616 TYS → ORD Jul 19, 19:10 UTCJul 19, 20:50 UTC1h 40m
2026-07-19 GJS4182 EWR → STL Jul 19, 15:00 UTCJul 19, 16:00 UTC1h 0m
2026-07-19 GJS4497 - Jul 19, 13:00 UTCJul 19, 13:45 UTC45m
2026-07-18 GJS4191 - Jul 18, 10:50 UTCJul 18, 11:40 UTC50m

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 N535GJ page for operator, model, and routing details .

Mode-S A6C39F frequently asked

What is Mode-S code A6C39F?
A6C39F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N535GJ.
Where is Mode-S A6C39F registered?
Mode-S code A6C39F 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 A6C39F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6C39F, octal 51541637, decimal 10,929,055.
What flights does A6C39F operate?
Mode-S A6C39F has broadcast 20 distinct callsigns, including GJS4442, GJS4396, GJS4401, GJS4443, GJS4424.