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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 18h ago
Flights observed
620
Distinct callsigns
20
Country
US
Last broadcast
18h ago

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
GJS4489 GoJet Airlines 9 2026-06-11
GJS4486 - 9 2026-07-08
GJS4181 GoJet Airlines 9 2026-06-23
GJS4491 - 8 2026-07-09
GJS4182 - 8 2026-07-10
GJS4584 - 7 2026-06-28
GJS4432 - 7 2026-07-12
GJS4430 - 7 2026-07-12
GJS4385 - 7 2026-07-11
GJS4172 - 7 2026-07-12
GJS4494 - 6 2026-06-25
GJS4483 - 6 2026-07-06
GJS4434 - 6 2026-06-30
GJS4390 - 6 2026-06-18
GJS4380 - 6 2026-06-23
GJS4180 - 6 2026-07-08
GJS4611 - 5 2026-06-15
GJS4573 GoJet Airlines 5 2026-05-27
GJS4572 - 5 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 GJS4527 IAD → STL Jul 13, 22:20 UTCJul 13, 23:55 UTC1h 35m
2026-07-13 GJS4389 - Jul 13, 19:00 UTCJul 13, 20:05 UTC1h 5m
2026-07-13 GJS4476 - Jul 13, 16:45 UTCJul 13, 17:50 UTC1h 5m
2026-07-13 GJS4459 - Jul 13, 14:05 UTCJul 13, 15:20 UTC1h 15m
2026-07-13 GJS4398 - Jul 13, 11:50 UTCJul 13, 12:50 UTC1h 0m
2026-07-13 GJS4174 DCA → EWR Jul 13, 00:55 UTCJul 13, 01:45 UTC50m
2026-07-12 GJS4432 EWR → DCA Jul 12, 23:30 UTCJul 13, 00:10 UTC40m
2026-07-12 GJS4442 DCA → EWR Jul 12, 17:20 UTCJul 12, 18:05 UTC45m
2026-07-12 GJS4172 EWR → DCA Jul 12, 15:20 UTCJul 12, 16:05 UTC45m
2026-07-12 GJS4172 EWR → DCA Jul 12, 15:22 UTCJul 12, 16:04 UTC42m
2026-07-12 GJS4430 - Jul 12, 13:10 UTCJul 12, 13:50 UTC40m
2026-07-12 GJS4437 EWR → DCA Jul 12, 10:50 UTCJul 12, 11:35 UTC45m
2026-07-11 GJS4191 - Jul 11, 11:00 UTCJul 11, 11:55 UTC55m
2026-07-11 GJS4191 BTV → EWR Jul 11, 10:38 UTCJul 11, 11:52 UTC1h 14m
2026-07-11 GJS4385 - Jul 11, 04:45 UTCJul 11, 05:31 UTC45m
2026-07-11 GJS4385 EWR → BTV Jul 11, 04:37 UTCJul 11, 05:26 UTC49m
2026-07-11 GJS4575 - Jul 11, 02:55 UTCJul 11, 03:45 UTC50m
2026-07-10 GJS4384 EWR → BTV Jul 10, 22:16 UTCJul 10, 22:59 UTC43m
2026-07-10 GJS4384 EWR → BTV Jul 10, 22:05 UTCJul 10, 23:00 UTC55m
2026-07-10 GJS4182 - Jul 10, 20:10 UTCJul 10, 21:00 UTC50m
2026-07-09 GJS4491 - Jul 9, 18:05 UTCJul 9, 18:50 UTC45m
2026-07-09 GJS4182 - Jul 9, 15:05 UTCJul 9, 15:55 UTC50m
2026-07-09 GJS4497 - Jul 9, 13:20 UTCJul 9, 14:00 UTC40m
2026-07-09 GJS4399 - Jul 9, 10:10 UTCJul 9, 11:35 UTC1h 25m
2026-07-09 GJS4405 - Jul 9, 01:25 UTCJul 9, 02:45 UTC1h 20m
2026-07-08 GJS4180 DCA → EWR Jul 8, 22:52 UTCJul 8, 23:19 UTC27m
2026-07-08 GJS4180 - Jul 8, 22:35 UTCJul 8, 23:20 UTC45m
2026-07-08 GJS4486 - Jul 8, 20:35 UTCJul 8, 21:20 UTC45m
2026-07-08 GJS4486 EWR → DCA Jul 8, 19:55 UTCJul 8, 21:18 UTC1h 23m
2026-07-08 GJS4442 DCA → EWR Jul 8, 17:05 UTCJul 8, 17:50 UTC45m
2026-07-08 GJS4172 EWR → DCA Jul 8, 15:20 UTCJul 8, 16:05 UTC45m
2026-07-08 GJS4430 DCA → EWR Jul 8, 12:40 UTCJul 8, 13:20 UTC40m
2026-07-08 GJS4430 DCA → EWR Jul 8, 12:50 UTCJul 8, 13:17 UTC27m
2026-07-08 GJS4437 EWR → DCA Jul 8, 10:45 UTCJul 8, 11:35 UTC50m
2026-07-08 GJS4174 DCA → EWR Jul 8, 01:05 UTCJul 8, 01:40 UTC35m
2026-07-07 GJS4432 EWR → DCA Jul 7, 23:18 UTCJul 8, 00:09 UTC51m
2026-07-07 GJS4432 EWR → DCA Jul 7, 23:25 UTCJul 8, 00:15 UTC50m
2026-07-07 GJS3370 MHT → EWR Jul 7, 19:35 UTCJul 7, 20:40 UTC1h 5m
2026-07-07 GJS4497 EWR → MHT Jul 7, 15:55 UTCJul 7, 17:20 UTC1h 25m
2026-07-07 GJS4191 - Jul 7, 10:30 UTCJul 7, 11:30 UTC1h 0m
2026-07-07 GJS4385 - Jul 7, 02:45 UTCJul 7, 03:35 UTC50m
2026-07-06 GJS4413 - Jul 6, 23:15 UTCJul 7, 00:55 UTC1h 40m
2026-07-06 GJS4465 ORD → CHA Jul 6, 20:05 UTCJul 6, 20:53 UTC48m
2026-07-06 GJS4465 ORD → CHA Jul 6, 19:50 UTCJul 6, 21:00 UTC1h 10m
2026-07-06 GJS4170 DCA → EWR Jul 6, 17:30 UTCJul 6, 18:15 UTC45m
2026-07-06 GJS4460 ORD → ATW Jul 6, 15:58 UTCJul 6, 16:09 UTC11m
2026-07-06 GJS4460 - Jul 6, 15:40 UTCJul 6, 16:10 UTC30m
2026-07-06 GJS4190 - Jul 6, 13:15 UTCJul 6, 14:10 UTC55m
2026-07-06 GJS4495 ORD → ATW Jul 6, 04:20 UTCJul 6, 04:50 UTC30m
2026-07-06 GJS4483 - Jul 6, 03:05 UTCJul 6, 03:10 UTC5m

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 18h ago.
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, GJS4489, GJS4486, GJS4181, GJS4491.