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sensors Mode-S transponder

A6CEC4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N538GJ · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A6CEC4
Octal
51547304
Decimal
10,931,908
Country
US
Tail
N538GJ
Type
CRJ7
No current signal · last broadcast Jul 26, 22:05 UTC
Flights observed
592
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:05 UTC

Last known position

Most recent position reported by Mode-S A6CEC4.

Country allocation

The ICAO 24-bit address A6CEC4 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
GJS4418 - 10 2026-07-17
GJS4403 - 8 2026-07-11
GJS4394 - 8 2026-07-16
GJS4615 - 7 2026-07-15
GJS4612 - 7 2026-07-14
GJS4580 - 7 2026-06-15
GJS4533 GoJet Airlines 7 2026-07-24
GJS4503 GoJet Airlines 7 2026-07-17
GJS4463 - 7 2026-06-25
GJS4455 - 7 2026-07-18
GJS4397 GoJet Airlines 7 2026-06-09
GJS4602 GoJet Airlines 6 2026-06-04
GJS4587 - 6 2026-07-16
GJS4529 GoJet Airlines 6 2026-05-14
GJS4506 - 6 2026-07-10
GJS4484 GoJet Airlines 6 2026-07-24
GJS4469 GoJet Airlines 6 2026-06-01
GJS4428 - 6 2026-07-13
GJS4390 - 6 2026-07-11
GJS4609 - 5 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 GJS4482 BTV → IAD Jul 26, 20:45 UTCJul 26, 22:05 UTC1h 20m
2026-07-26 GJS4571 ICT → ORD Jul 26, 18:05 UTCJul 26, 19:30 UTC1h 25m
2026-07-26 GJS4571 ICT → ORD Jul 26, 18:09 UTCJul 26, 19:24 UTC1h 15m
2026-07-26 GJS4543 ORD → CMH Jul 26, 15:58 UTCJul 26, 16:48 UTC50m
2026-07-26 GJS4543 ORD → CMH Jul 26, 15:40 UTCJul 26, 16:55 UTC1h 15m
2026-07-26 GJS4449 ORD → STL Jul 26, 12:40 UTCJul 26, 14:20 UTC1h 40m
2026-07-26 GJS4449 ORD → STL Jul 26, 12:33 UTCJul 26, 14:12 UTC1h 39m
2026-07-26 GJS4447 RIC → EWR Jul 26, 03:20 UTCJul 26, 04:25 UTC1h 5m
2026-07-26 GJS4447 RIC → EWR Jul 26, 03:03 UTCJul 26, 04:32 UTC1h 29m
2026-07-25 GJS4447 RIC → EWR Jul 25, 21:50 UTCJul 25, 23:25 UTC1h 35m
2026-07-25 GJS4447 RIC → EWR Jul 25, 21:50 UTCJul 25, 23:15 UTC1h 25m
2026-07-25 GJS4501 SCE → EWR Jul 25, 19:25 UTCJul 25, 20:40 UTC1h 15m
2026-07-25 GJS4584 IAD → EWR Jul 25, 14:25 UTCJul 25, 15:40 UTC1h 15m
2026-07-25 GJS4551 ORD → XNA Jul 25, 12:25 UTCJul 25, 13:25 UTC1h 0m
2026-07-25 GJS4415 EWR → PHL Jul 25, 09:50 UTCJul 25, 10:45 UTC55m
2026-07-25 GJS4415 EWR → PHL Jul 25, 10:03 UTCJul 25, 10:26 UTC23m
2026-07-24 GJS4484 EWR → HHH Jul 24, 23:15 UTCJul 24, 23:55 UTC40m
2026-07-24 GJS4533 IAD → LGA Jul 24, 21:30 UTCJul 24, 21:55 UTC25m
2026-07-24 GJS4533 IAD → LGA Jul 24, 21:00 UTCJul 24, 21:14 UTC14m
2026-07-24 GJS4488 GSP → EWR Jul 24, 19:25 UTCJul 24, 19:55 UTC30m
2026-07-24 GJS4438 DCA → EWR Jul 24, 14:10 UTCJul 24, 15:45 UTC1h 35m
2026-07-24 GJS3375 RIC → EWR Jul 24, 12:26 UTCJul 24, 12:58 UTC32m
2026-07-20 GJS4531 LNK → ORD Jul 20, 04:20 UTCJul 20, 05:10 UTC50m
2026-07-20 GJS4531 LNK → ORD Jul 20, 03:20 UTCJul 20, 05:07 UTC1h 47m
2026-07-20 GJS4448 IAD → SDF Jul 20, 01:35 UTCJul 20, 02:50 UTC1h 15m
2026-07-19 GJS4608 - Jul 19, 21:45 UTCJul 19, 22:50 UTC1h 5m
2026-07-19 GJS4608 GSO → EWR Jul 19, 21:29 UTCJul 19, 22:56 UTC1h 27m
2026-07-19 GJS4489 EWR → DCA Jul 19, 16:35 UTCJul 19, 17:40 UTC1h 5m
2026-07-19 GJS4184 DCA → EWR Jul 19, 14:20 UTCJul 19, 14:55 UTC35m
2026-07-19 GJS4184 DCA → EWR Jul 19, 14:24 UTCJul 19, 14:57 UTC33m
2026-07-19 GJS4446 DCA → EWR Jul 19, 12:41 UTCJul 19, 13:21 UTC40m
2026-07-19 GJS4446 DCA → EWR Jul 19, 12:40 UTCJul 19, 13:20 UTC40m
2026-07-18 GJS4493 - Jul 18, 14:45 UTCJul 18, 15:35 UTC50m
2026-07-18 GJS4493 RIC → EWR Jul 18, 14:45 UTCJul 18, 15:35 UTC50m
2026-07-18 GJS4473 IAD → RIC Jul 18, 03:35 UTCJul 18, 04:00 UTC25m
2026-07-18 GJS4455 - Jul 18, 00:15 UTCJul 18, 00:50 UTC35m
2026-07-17 GJS4455 - Jul 17, 23:35 UTCJul 18, 00:10 UTC35m
2026-07-17 GJS4418 - Jul 17, 21:15 UTCJul 17, 22:25 UTC1h 10m
2026-07-17 GJS4549 IAD → ORF Jul 17, 19:09 UTCJul 17, 19:35 UTC25m
2026-07-17 GJS4535 - Jul 17, 17:20 UTCJul 17, 17:50 UTC30m
2026-07-17 GJS4504 - Jul 17, 14:50 UTCJul 17, 15:55 UTC1h 5m
2026-07-17 GJS4504 PVD → IAD Jul 17, 14:53 UTCJul 17, 16:02 UTC1h 9m
2026-07-17 GJS4492 - Jul 17, 12:50 UTCJul 17, 13:50 UTC1h 0m
2026-07-17 GJS4503 EWR → DCA Jul 17, 10:44 UTCJul 17, 11:04 UTC20m
2026-07-17 GJS4503 EWR → DCA Jul 17, 10:47 UTCJul 17, 11:12 UTC25m
2026-07-17 GJS4473 IAD → RIC Jul 17, 02:54 UTCJul 17, 03:14 UTC20m
2026-07-17 GJS4561 - Jul 17, 00:10 UTCJul 17, 00:35 UTC25m
2026-07-16 GJS4393 - Jul 16, 22:15 UTCJul 16, 22:35 UTC20m
2026-07-16 GJS4387 - Jul 16, 19:14 UTCJul 16, 20:15 UTC1h 0m
2026-07-16 GJS4420 - Jul 16, 17:05 UTCJul 16, 18:00 UTC55m

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 N538GJ page for operator, model, and routing details .

Mode-S A6CEC4 frequently asked

What is Mode-S code A6CEC4?
A6CEC4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N538GJ.
Where is Mode-S A6CEC4 registered?
Mode-S code A6CEC4 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 A6CEC4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6CEC4, octal 51547304, decimal 10,931,908.
What flights does A6CEC4 operate?
Mode-S A6CEC4 has broadcast 20 distinct callsigns, including GJS4418, GJS4403, GJS4394, GJS4615, GJS4612.