Apparatus

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sensors Mode-S transponder

A73A1C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N565GJ · operated by UNITED AIRLINES INC

Hex
A73A1C
Octal
51635034
Decimal
10,959,388
Country
US
Tail
N565GJ
Type
CRJ7
Broadcasting now · callsign GJS4525 · 6,900 ft
Flights observed
688
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Current position

A73A1C is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A73A1C 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
GJS4183 - 11 2026-06-25
GJS4384 GoJet Airlines 10 2026-07-24
GJS4191 GoJet Airlines 10 2026-07-25
GJS4182 GoJet Airlines 9 2026-07-22
GJS4519 GoJet Airlines 8 2026-06-14
GJS4391 - 8 2026-07-01
GJS4479 - 7 2026-07-01
GJS4454 - 7 2026-07-15
GJS4421 GoJet Airlines 7 2026-06-10
GJS4575 GoJet Airlines 6 2026-07-25
GJS4565 - 6 2026-06-30
GJS4560 GoJet Airlines 6 2026-07-23
GJS4546 GoJet Airlines 6 2026-06-09
GJS4508 GoJet Airlines 6 2026-07-23
GJS4503 GoJet Airlines 6 2026-07-26
GJS4502 - 6 2026-06-25
GJS4447 - 6 2026-06-27
GJS4445 - 6 2026-06-24
GJS4444 GoJet Airlines 6 2026-07-23
GJS4425 - 6 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 GJS4588 EWR → RIC Jul 26, 21:50 UTCJul 26, 22:45 UTC55m
2026-07-26 GJS4521 GSO → ORD Jul 26, 19:10 UTCJul 26, 20:05 UTC55m
2026-07-26 GJS4521 GSO → ORD Jul 26, 19:17 UTCJul 26, 20:21 UTC1h 4m
2026-07-26 GJS4485 EWR → DCA Jul 26, 17:15 UTCJul 26, 18:05 UTC50m
2026-07-26 GJS4167 RIC → EWR Jul 26, 14:40 UTCJul 26, 15:40 UTC1h 0m
2026-07-26 GJS4615 TYS → ORD Jul 26, 12:55 UTCJul 26, 13:55 UTC1h 0m
2026-07-26 GJS4503 EWR → DCA Jul 26, 10:40 UTCJul 26, 11:10 UTC30m
2026-07-25 GJS4515 ORD → LEX Jul 25, 23:50 UTCJul 26, 00:40 UTC50m
2026-07-25 GJS4515 ORD → LEX Jul 25, 21:45 UTCJul 25, 22:35 UTC50m
2026-07-25 GJS4538 - Jul 25, 18:05 UTCJul 25, 18:50 UTC45m
2026-07-25 GJS4437 EWR → PHL Jul 25, 15:25 UTCJul 25, 16:20 UTC55m
2026-07-25 GJS4437 EWR → PHL Jul 25, 15:19 UTCJul 25, 16:25 UTC1h 6m
2026-07-25 GJS4411 DCA → EWR Jul 25, 12:50 UTCJul 25, 13:35 UTC45m
2026-07-25 GJS4191 RIC → EWR Jul 25, 10:20 UTCJul 25, 11:10 UTC50m
2026-07-25 GJS4385 EWR → ROC Jul 25, 02:30 UTCJul 25, 03:15 UTC45m
2026-07-25 GJS4575 EWR → STL Jul 25, 00:00 UTCJul 25, 00:50 UTC50m
2026-07-24 GJS4384 IAD → YOW Jul 24, 22:00 UTCJul 24, 22:50 UTC50m
2026-07-24 GJS4514 EWR → CVG Jul 24, 00:30 UTCJul 24, 01:30 UTC1h 0m
2026-07-23 GJS4509 EWR → GSO Jul 23, 22:00 UTCJul 23, 23:15 UTC1h 15m
2026-07-23 GJS4560 DCA → EWR Jul 23, 19:30 UTCJul 23, 20:05 UTC35m
2026-07-23 GJS4472 ALB → EWR Jul 23, 17:45 UTCJul 23, 18:30 UTC45m
2026-07-23 GJS4508 STL → EWR Jul 23, 15:10 UTCJul 23, 15:45 UTC35m
2026-07-23 GJS4444 EWR → DCA Jul 23, 13:30 UTCJul 23, 14:07 UTC37m
2026-07-23 GJS4444 EWR → DCA Jul 23, 13:25 UTCJul 23, 14:10 UTC45m
2026-07-23 GJS4174 DCA → EWR Jul 23, 01:30 UTCJul 23, 02:10 UTC40m
2026-07-22 GJS4432 STL → EWR Jul 22, 22:38 UTCJul 22, 23:46 UTC1h 8m
2026-07-22 GJS4432 STL → EWR Jul 22, 23:05 UTCJul 22, 23:55 UTC50m
2026-07-22 GJS4515 - Jul 22, 20:15 UTCJul 22, 21:05 UTC50m
2026-07-22 GJS4538 EWR → BTV Jul 22, 18:05 UTCJul 22, 18:50 UTC45m
2026-07-22 GJS4538 EWR → BTV Jul 22, 18:10 UTCJul 22, 18:47 UTC37m
2026-07-22 GJS4182 EWR → STL Jul 22, 15:00 UTCJul 22, 15:55 UTC55m
2026-07-22 GJS4182 EWR → STL Jul 22, 15:11 UTCJul 22, 15:56 UTC45m
2026-07-22 GJS4497 - Jul 22, 13:10 UTCJul 22, 13:55 UTC45m
2026-07-22 GJS4191 RIC → EWR Jul 22, 11:10 UTCJul 22, 11:15 UTC5m
2026-07-21 GJS3378 - Jul 21, 15:55 UTCJul 21, 17:10 UTC1h 15m
2026-07-21 GJS4444 EWR → DCA Jul 21, 13:25 UTCJul 21, 14:25 UTC1h 0m
2026-07-20 GJS4413 DCA → EWR Jul 20, 23:40 UTCJul 21, 01:30 UTC1h 50m
2026-07-20 GJS4465 - Jul 20, 20:45 UTCJul 20, 21:50 UTC1h 5m
2026-07-20 GJS4510 EWR → PIT Jul 20, 18:55 UTCJul 20, 19:30 UTC35m
2026-07-20 GJS4450 - Jul 20, 17:00 UTCJul 20, 18:00 UTC1h 0m
2026-07-20 GJS4557 ORD → MSN Jul 20, 14:05 UTCJul 20, 14:45 UTC40m
2026-07-20 GJS4179 IAD → EWR Jul 20, 00:15 UTCJul 20, 00:50 UTC35m
2026-07-19 GJS4466 - Jul 19, 21:15 UTCJul 19, 22:25 UTC1h 10m
2026-07-19 GJS4466 SGF → ORD Jul 19, 20:56 UTCJul 19, 22:08 UTC1h 12m
2026-07-19 GJS4569 - Jul 19, 17:40 UTCJul 19, 18:55 UTC1h 15m
2026-07-19 GJS4579 - Jul 19, 13:50 UTCJul 19, 15:25 UTC1h 35m
2026-07-18 GJS4527 IAD → STL Jul 18, 22:43 UTCJul 19, 00:36 UTC1h 53m
2026-07-18 GJS4527 IAD → STL Jul 18, 22:35 UTCJul 19, 00:10 UTC1h 35m
2026-07-18 GJS4459 - Jul 18, 15:10 UTCJul 18, 17:05 UTC1h 55m
2026-07-18 GJS4398 - Jul 18, 13:15 UTCJul 18, 14:15 UTC1h 0m

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 N565GJ page for operator, model, and routing details .

Mode-S A73A1C frequently asked

What is Mode-S code A73A1C?
A73A1C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N565GJ.
Where is Mode-S A73A1C registered?
Mode-S code A73A1C 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 A73A1C broadcasting right now?
Yes. Mode-S A73A1C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A73A1C, octal 51635034, decimal 10,959,388.
What flights does A73A1C operate?
Mode-S A73A1C has broadcast 20 distinct callsigns, including GJS4183, GJS4384, GJS4191, GJS4182, GJS4519.