Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 5h ago
Flights observed
581
Distinct callsigns
20
Country
US
Last broadcast
5h ago

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 GoJet Airlines 10 2026-06-14
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
GJS4433 GoJet Airlines 7 2026-06-09
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
GJS4394 GoJet Airlines 6 2026-05-15
GJS4176 - 6 2026-07-11
GJS4172 GoJet Airlines 6 2026-06-14
GJS4566 - 5 2026-07-03
GJS4558 GoJet Airlines 5 2026-06-04
GJS4540 GoJet Airlines 5 2026-06-03
GJS4524 GoJet Airlines 5 2026-05-20
GJS4508 - 5 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 GJS4174 DCA → EWR Jul 14, 00:40 UTCJul 14, 01:30 UTC50m
2026-07-13 GJS4432 - Jul 13, 23:05 UTCJul 13, 23:50 UTC45m
2026-07-13 GJS4494 - Jul 13, 20:15 UTCJul 13, 21:10 UTC55m
2026-07-13 GJS4491 - Jul 13, 18:05 UTCJul 13, 18:55 UTC50m
2026-07-13 GJS4182 - Jul 13, 15:45 UTCJul 13, 16:45 UTC1h 0m
2026-07-13 GJS4497 - Jul 13, 13:15 UTCJul 13, 14:00 UTC45m
2026-07-13 GJS4497 EWR → ACK Jul 13, 13:15 UTCJul 13, 14:06 UTC51m
2026-07-13 GJS4580 - Jul 13, 10:20 UTCJul 13, 11:35 UTC1h 15m
2026-07-13 GJS4520 EWR → GSO Jul 13, 02:23 UTCJul 13, 03:18 UTC55m
2026-07-12 GJS4385 ROC → EWR Jul 12, 23:35 UTCJul 13, 00:25 UTC50m
2026-07-12 GJS4586 - Jul 12, 21:30 UTCJul 12, 22:15 UTC45m
2026-07-12 GJS4508 - Jul 12, 15:20 UTCJul 12, 15:55 UTC35m
2026-07-12 GJS4457 EWR → DCA Jul 12, 00:48 UTCJul 12, 02:00 UTC1h 12m
2026-07-12 GJS4457 EWR → DCA Jul 12, 01:10 UTCJul 12, 02:01 UTC50m
2026-07-11 GJS4180 DCA → EWR Jul 11, 22:40 UTCJul 11, 23:15 UTC35m
2026-07-11 GJS4180 DCA → EWR Jul 11, 22:37 UTCJul 11, 23:28 UTC51m
2026-07-11 GJS4486 FME → DCA Jul 11, 21:30 UTCJul 11, 21:45 UTC15m
2026-07-11 GJS4486 - Jul 11, 20:45 UTCJul 11, 21:25 UTC40m
2026-07-11 GJS4486 EWR → DCA Jul 11, 20:25 UTCJul 11, 21:40 UTC1h 15m
2026-07-11 GJS4192 - Jul 11, 16:15 UTCJul 11, 17:45 UTC1h 30m
2026-07-11 GJS4192 CVG → EWR Jul 11, 16:19 UTCJul 11, 17:47 UTC1h 28m
2026-07-11 GJS4487 IAD → CVG Jul 11, 13:20 UTCJul 11, 14:30 UTC1h 10m
2026-07-11 GJS4487 IAD → CVG Jul 11, 13:17 UTCJul 11, 14:25 UTC1h 8m
2026-07-11 GJS4561 - Jul 11, 04:40 UTCJul 11, 05:10 UTC30m
2026-07-11 GJS4176 EWR → RIC Jul 11, 02:25 UTCJul 11, 03:20 UTC55m
2026-07-10 GJS4457 - Jul 10, 23:40 UTCJul 11, 00:50 UTC1h 10m
2026-07-10 GJS4457 PIT → EWR Jul 10, 23:26 UTCJul 11, 00:53 UTC1h 27m
2026-07-10 GJS4396 - Jul 10, 21:20 UTCJul 10, 22:35 UTC1h 15m
2026-07-10 GJS4396 EWR → PIT Jul 10, 20:27 UTCJul 10, 22:31 UTC2h 3m
2026-07-10 GJS4508 DCA → EWR Jul 10, 15:25 UTCJul 10, 16:10 UTC45m
2026-07-10 GJS4444 EWR → DCA Jul 10, 13:20 UTCJul 10, 14:10 UTC50m
2026-07-10 GJS4399 - Jul 10, 10:30 UTCJul 10, 12:00 UTC1h 30m
2026-07-09 GJS4430 - Jul 9, 18:45 UTCJul 9, 20:25 UTC1h 40m
2026-07-09 GJS4430 EWR → AVL Jul 9, 18:11 UTCJul 9, 20:20 UTC2h 9m
2026-07-09 GJS4403 - Jul 9, 15:50 UTCJul 9, 16:45 UTC55m
2026-07-09 GJS4390 EWR → PIT Jul 9, 13:45 UTCJul 9, 14:30 UTC45m
2026-07-09 GJS4390 EWR → PIT Jul 9, 13:35 UTCJul 9, 14:35 UTC1h 0m
2026-07-09 GJS4604 RIC → EWR Jul 9, 11:07 UTCJul 9, 12:07 UTC1h 0m
2026-07-09 GJS4473 IAD → RIC Jul 9, 02:28 UTCJul 9, 02:41 UTC13m
2026-07-09 GJS4473 - Jul 9, 02:20 UTCJul 9, 02:45 UTC25m
2026-07-09 GJS4587 PHL → IAD Jul 9, 00:05 UTCJul 9, 00:35 UTC30m
2026-07-08 GJS4534 IAD → PHL Jul 8, 22:10 UTCJul 8, 22:50 UTC40m
2026-07-08 GJS4387 - Jul 8, 19:20 UTCJul 8, 20:20 UTC1h 0m
2026-07-08 GJS4420 IAD → CMH Jul 8, 17:10 UTCJul 8, 17:55 UTC45m
2026-07-08 GJS4485 - Jul 8, 15:05 UTCJul 8, 15:25 UTC20m
2026-07-08 GJS4498 - Jul 8, 13:20 UTCJul 8, 13:45 UTC25m
2026-07-08 GJS4498 IAD → RIC Jul 8, 13:11 UTCJul 8, 13:52 UTC41m
2026-07-07 GJS4545 ORD → MLI Jul 7, 19:00 UTCJul 7, 20:15 UTC1h 15m
2026-07-07 GJS4424 - Jul 7, 16:50 UTCJul 7, 17:55 UTC1h 5m
2026-07-07 GJS4424 IAD → YOW Jul 7, 16:55 UTCJul 7, 17:58 UTC1h 3m

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 5h ago.
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.