Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 15h ago
Flights observed
525
Distinct callsigns
20
Country
US
Last broadcast
15h ago

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 - 8 2026-07-13
GJS4403 - 8 2026-07-11
GJS4580 - 7 2026-06-15
GJS4463 - 7 2026-06-25
GJS4397 GoJet Airlines 7 2026-06-09
GJS4394 - 7 2026-07-12
GJS4612 - 6 2026-07-13
GJS4602 GoJet Airlines 6 2026-06-04
GJS4529 GoJet Airlines 6 2026-05-14
GJS4506 - 6 2026-07-10
GJS4469 GoJet Airlines 6 2026-06-01
GJS4428 - 6 2026-07-13
GJS4390 - 6 2026-07-11
GJS4615 - 5 2026-07-12
GJS4604 - 5 2026-07-11
GJS4567 - 5 2026-07-11
GJS4545 - 5 2026-07-10
GJS4533 - 5 2026-06-27
GJS4530 - 5 2026-06-24
GJS4508 GoJet Airlines 5 2026-06-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 GJS4418 ROA → IAD Jul 13, 18:35 UTCJul 13, 19:10 UTC35m
2026-07-13 GJS4612 IAD → ROA Jul 13, 17:00 UTCJul 13, 17:45 UTC45m
2026-07-13 GJS4612 IAD → ROA Jul 13, 17:00 UTCJul 13, 17:39 UTC39m
2026-07-13 GJS4181 - Jul 13, 14:30 UTCJul 13, 15:35 UTC1h 5m
2026-07-13 GJS4188 IAD → DAY Jul 13, 12:36 UTCJul 13, 13:29 UTC53m
2026-07-13 GJS4188 IAD → DAY Jul 13, 12:30 UTCJul 13, 13:30 UTC1h 0m
2026-07-13 GJS4428 - Jul 13, 10:20 UTCJul 13, 11:15 UTC55m
2026-07-13 GJS4428 CMH → IAD Jul 13, 10:18 UTCJul 13, 11:17 UTC59m
2026-07-13 GJS4414 IAD → CMH Jul 13, 02:35 UTCJul 13, 03:25 UTC50m
2026-07-12 GJS4593 - Jul 12, 23:50 UTCJul 13, 00:45 UTC55m
2026-07-12 GJS4593 CMH → IAD Jul 12, 23:58 UTCJul 13, 00:43 UTC45m
2026-07-12 GJS4588 IAD → CMH Jul 12, 21:48 UTCJul 12, 22:32 UTC44m
2026-07-12 GJS4588 IAD → CMH Jul 12, 21:40 UTCJul 12, 22:35 UTC55m
2026-07-12 GJS4521 ROC → IAD Jul 12, 19:05 UTCJul 12, 20:05 UTC1h 0m
2026-07-12 GJS4485 IAD → ROC Jul 12, 17:20 UTCJul 12, 18:10 UTC50m
2026-07-12 GJS4167 - Jul 12, 15:01 UTCJul 12, 16:05 UTC1h 5m
2026-07-12 GJS4615 - Jul 12, 12:40 UTCJul 12, 13:45 UTC1h 5m
2026-07-12 GJS4578 ROC → IAD Jul 12, 10:15 UTCJul 12, 11:10 UTC55m
2026-07-12 GJS4394 - Jul 12, 03:45 UTCJul 12, 04:35 UTC50m
2026-07-12 GJS4561 RIC → IAD Jul 12, 02:26 UTCJul 12, 02:28 UTC2m
2026-07-12 GJS4561 - Jul 12, 02:01 UTCJul 12, 02:10 UTC10m
2026-07-12 GJS4176 - Jul 12, 00:05 UTCJul 12, 00:55 UTC50m
2026-07-11 GJS4567 - Jul 11, 21:40 UTCJul 11, 23:00 UTC1h 20m
2026-07-11 GJS4590 EWR → CMH Jul 11, 18:38 UTCJul 11, 20:05 UTC1h 27m
2026-07-11 GJS4590 EWR → CMH Jul 11, 18:35 UTCJul 11, 19:50 UTC1h 15m
2026-07-11 GJS4403 - Jul 11, 15:35 UTCJul 11, 16:30 UTC55m
2026-07-11 GJS4403 PIT → EWR Jul 11, 15:42 UTCJul 11, 16:33 UTC51m
2026-07-11 GJS4390 EWR → PIT Jul 11, 13:45 UTCJul 11, 14:28 UTC43m
2026-07-11 GJS4390 EWR → PIT Jul 11, 13:35 UTCJul 11, 14:25 UTC50m
2026-07-11 GJS4604 - Jul 11, 11:05 UTCJul 11, 11:55 UTC50m
2026-07-11 GJS4604 RIC → EWR Jul 11, 11:07 UTCJul 11, 11:48 UTC41m
2026-07-10 GJS4393 - Jul 10, 22:25 UTCJul 10, 22:35 UTC10m
2026-07-10 GJS4393 IAD → RIC Jul 10, 22:23 UTCJul 10, 22:47 UTC24m
2026-07-10 GJS4545 - Jul 10, 19:10 UTCJul 10, 20:30 UTC1h 20m
2026-07-10 GJS4424 - Jul 10, 17:00 UTCJul 10, 18:10 UTC1h 10m
2026-07-10 GJS4506 STL → IAD Jul 10, 13:50 UTCJul 10, 15:35 UTC1h 45m
2026-07-09 GJS4425 IAD → STL Jul 9, 13:55 UTCJul 9, 15:35 UTC1h 40m
2026-07-06 GJS4455 - Jul 6, 23:35 UTCJul 7, 01:00 UTC1h 25m
2026-07-06 GJS4418 IAD → YOW Jul 6, 21:25 UTCJul 6, 22:35 UTC1h 10m
2026-07-06 GJS4418 ROA → IAD Jul 6, 18:55 UTCJul 6, 19:40 UTC45m
2026-07-06 GJS4612 IAD → ROA Jul 6, 17:25 UTCJul 6, 18:00 UTC35m
2026-07-06 GJS4506 STL → IAD Jul 6, 14:40 UTCJul 6, 16:20 UTC1h 40m
2026-07-05 GJS4425 IAD → STL Jul 5, 13:15 UTCJul 5, 14:50 UTC1h 35m
2026-07-05 GJS4503 RIC → IAD Jul 5, 10:50 UTCJul 5, 11:20 UTC30m
2026-07-04 GJS4386 - Jul 4, 23:50 UTCJul 5, 00:45 UTC55m
2026-07-04 GJS4403 - Jul 4, 15:40 UTCJul 4, 16:30 UTC50m
2026-07-04 GJS4390 - Jul 4, 13:45 UTCJul 4, 14:40 UTC55m
2026-07-04 GJS4390 EWR → PIT Jul 4, 13:45 UTCJul 4, 14:36 UTC51m
2026-07-04 GJS4604 - Jul 4, 11:00 UTCJul 4, 11:50 UTC50m
2026-07-04 GJS4604 RIC → EWR Jul 4, 11:07 UTCJul 4, 11:50 UTC43m

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 15h ago.
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, GJS4580, GJS4463, GJS4397.