Apparatus

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sensors Mode-S transponder

A6F643

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N548GJ · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A6F643
Octal
51573103
Decimal
10,942,019
Country
US
Tail
N548GJ
Type
CRJ7
No current signal · last broadcast Jul 26, 15:35 UTC
Flights observed
676
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 15:35 UTC

Last known position

Most recent position reported by Mode-S A6F643.

Country allocation

The ICAO 24-bit address A6F643 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
GJS4497 - 11 2026-07-09
GJS4584 GoJet Airlines 9 2026-07-23
GJS4489 GoJet Airlines 9 2026-06-11
GJS4486 - 9 2026-07-08
GJS4181 GoJet Airlines 9 2026-06-23
GJS4491 - 8 2026-07-09
GJS4183 GoJet Airlines 8 2026-07-24
GJS4182 - 8 2026-07-10
GJS4432 - 7 2026-07-12
GJS4430 - 7 2026-07-12
GJS4385 - 7 2026-07-11
GJS4380 GoJet Airlines 7 2026-07-24
GJS4172 - 7 2026-07-12
GJS4573 GoJet Airlines 6 2026-07-23
GJS4510 GoJet Airlines 6 2026-07-19
GJS4494 - 6 2026-06-25
GJS4483 - 6 2026-07-06
GJS4434 - 6 2026-06-30
GJS4426 GoJet Airlines 6 2026-07-21
GJS4390 - 6 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 GJS3376 DCA → ALB Jul 26, 14:45 UTCJul 26, 15:35 UTC50m
2026-07-25 GJS4514 EWR → CVG Jul 25, 15:50 UTCJul 25, 16:25 UTC35m
2026-07-25 GJS4585 IAD → PHL Jul 25, 12:25 UTCJul 25, 14:00 UTC1h 35m
2026-07-24 GJS4605 PQI → EWR Jul 24, 22:35 UTCJul 25, 00:00 UTC1h 25m
2026-07-24 GJS4168 DCA → EWR Jul 24, 19:25 UTCJul 24, 21:00 UTC1h 35m
2026-07-24 GJS4380 RIC → EWR Jul 24, 16:30 UTCJul 24, 18:00 UTC1h 30m
2026-07-24 GJS4183 EWR → RIC Jul 24, 13:15 UTCJul 24, 14:05 UTC50m
2026-07-23 GJS4573 LEX → ORD Jul 23, 23:55 UTCJul 24, 01:35 UTC1h 40m
2026-07-23 GJS4574 ORD → YOW Jul 23, 20:25 UTCJul 23, 21:45 UTC1h 20m
2026-07-23 GJS4436 IAD → PWM Jul 23, 18:15 UTCJul 23, 19:20 UTC1h 5m
2026-07-23 GJS4436 IAD → PWM Jul 23, 18:16 UTCJul 23, 19:17 UTC1h 1m
2026-07-23 GJS4584 IAD → EWR Jul 23, 14:40 UTCJul 23, 16:00 UTC1h 20m
2026-07-23 GJS4584 IAD → EWR Jul 23, 14:33 UTCJul 23, 15:42 UTC1h 9m
2026-07-23 GJS4551 ORD → XNA Jul 23, 12:40 UTCJul 23, 13:50 UTC1h 10m
2026-07-22 GJS4400 IAD → LGA Jul 22, 22:05 UTCJul 23, 00:05 UTC2h 0m
2026-07-22 GJS4523 ORD → CAE Jul 22, 19:26 UTCJul 22, 20:35 UTC1h 9m
2026-07-22 GJS4523 - Jul 22, 19:10 UTCJul 22, 20:30 UTC1h 20m
2026-07-22 GJS4600 RIC → ORD Jul 22, 16:10 UTCJul 22, 18:00 UTC1h 50m
2026-07-22 GJS4541 IAD → CVG Jul 22, 13:45 UTCJul 22, 15:00 UTC1h 15m
2026-07-22 GJS4540 TUL → ORD Jul 22, 11:10 UTCJul 22, 11:40 UTC30m
2026-07-21 GJS4507 - Jul 21, 23:30 UTCJul 22, 00:50 UTC1h 20m
2026-07-21 GJS4441 FSD → ORD Jul 21, 21:12 UTCJul 21, 21:37 UTC25m
2026-07-21 GJS4441 - Jul 21, 20:50 UTCJul 21, 20:55 UTC5m
2026-07-21 GJS4443 - Jul 21, 17:55 UTCJul 21, 19:10 UTC1h 15m
2026-07-21 GJS4426 GSO → EWR Jul 21, 14:15 UTCJul 21, 16:00 UTC1h 45m
2026-07-21 GJS4426 GSO → EWR Jul 21, 14:15 UTCJul 21, 15:43 UTC1h 28m
2026-07-21 GJS4553 ORD → LIT Jul 21, 01:18 UTCJul 21, 02:24 UTC1h 6m
2026-07-21 GJS4553 ORD → LIT Jul 21, 01:10 UTCJul 21, 02:25 UTC1h 15m
2026-07-20 GJS4171 DTW → EWR Jul 20, 22:30 UTCJul 20, 23:30 UTC1h 0m
2026-07-20 GJS4171 DTW → EWR Jul 20, 22:17 UTCJul 20, 23:16 UTC59m
2026-07-20 GJS4388 ORD → YOW Jul 20, 20:50 UTCJul 20, 21:30 UTC40m
2026-07-20 GJS4381 STL → ORD Jul 20, 18:19 UTCJul 20, 19:02 UTC43m
2026-07-20 GJS4381 STL → ORD Jul 20, 18:00 UTCJul 20, 19:45 UTC1h 45m
2026-07-20 GJS4382 EWR → DCA Jul 20, 15:40 UTCJul 20, 16:55 UTC1h 15m
2026-07-20 GJS4183 EWR → RIC Jul 20, 13:35 UTCJul 20, 14:40 UTC1h 5m
2026-07-20 GJS4183 EWR → RIC Jul 20, 13:17 UTCJul 20, 14:23 UTC1h 6m
2026-07-19 GJS4416 ILM → EWR Jul 19, 21:20 UTCJul 19, 22:05 UTC45m
2026-07-19 GJS4510 EWR → PIT Jul 19, 18:15 UTCJul 19, 18:55 UTC40m
2026-07-19 GJS4450 - Jul 19, 16:55 UTCJul 19, 17:30 UTC35m
2026-07-19 GJS4557 ORD → MSN Jul 19, 14:05 UTCJul 19, 14:50 UTC45m
2026-07-19 GJS3384 ALB → DCA Jul 19, 00:19 UTCJul 19, 02:06 UTC1h 47m
2026-07-18 GJS4607 TVC → ORD Jul 18, 18:20 UTCJul 18, 19:15 UTC55m
2026-07-18 GJS4185 - Jul 18, 15:10 UTCJul 18, 16:45 UTC1h 35m
2026-07-17 GJS4173 - Jul 17, 23:25 UTCJul 18, 01:00 UTC1h 35m
2026-07-17 GJS4383 - Jul 17, 21:30 UTCJul 17, 22:15 UTC45m
2026-07-17 GJS4383 ATW → ORD Jul 17, 21:11 UTCJul 17, 22:05 UTC54m
2026-07-17 GJS4475 ORD → ATW Jul 17, 18:15 UTCJul 17, 18:55 UTC40m
2026-07-17 GJS4426 - Jul 17, 15:44 UTCJul 17, 17:09 UTC1h 25m
2026-07-17 GJS4553 - Jul 17, 03:05 UTCJul 17, 04:29 UTC1h 25m
2026-07-17 GJS4553 ORD → GSO Jul 17, 03:13 UTCJul 17, 04:29 UTC1h 16m

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 N548GJ page for operator, model, and routing details .

Mode-S A6F643 frequently asked

What is Mode-S code A6F643?
A6F643 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N548GJ.
Where is Mode-S A6F643 registered?
Mode-S code A6F643 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 A6F643 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 15:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6F643, octal 51573103, decimal 10,942,019.
What flights does A6F643 operate?
Mode-S A6F643 has broadcast 20 distinct callsigns, including GJS4497, GJS4584, GJS4489, GJS4486, GJS4181.