Apparatus

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sensors Mode-S transponder

A703C1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N551GJ · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A703C1
Octal
51601701
Decimal
10,945,473
Country
US
Tail
N551GJ
Type
CRJ7
No current signal · last broadcast 14h ago
Flights observed
662
Distinct callsigns
20
Country
US
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S A703C1.

Country allocation

The ICAO 24-bit address A703C1 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
GJS4564 GoJet Airlines 10 2026-05-31
GJS4498 - 9 2026-07-05
GJS4457 - 8 2026-07-11
GJS4430 - 8 2026-07-10
GJS4170 GoJet Airlines 8 2026-06-10
GJS4476 - 7 2026-07-06
GJS4441 GoJet Airlines 7 2026-05-11
GJS4418 - 7 2026-07-12
GJS4396 - 7 2026-06-27
GJS4167 - 7 2026-07-11
GJS4604 - 6 2026-06-28
GJS4554 GoJet Airlines 6 2026-05-15
GJS4495 - 6 2026-06-21
GJS4494 - 6 2026-07-11
GJS4486 - 6 2026-07-10
GJS4459 - 6 2026-07-12
GJS4442 - 6 2026-07-10
GJS4437 - 6 2026-07-10
GJS4415 GoJet Airlines 6 2026-05-30
GJS4408 - 6 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 GJS3395 IAD → STL Jul 13, 14:05 UTCJul 13, 16:00 UTC1h 55m
2026-07-13 GJS4471 - Jul 13, 00:01 UTCJul 13, 01:01 UTC1h 0m
2026-07-12 GJS4456 IAD → PVD Jul 12, 21:45 UTCJul 12, 23:05 UTC1h 20m
2026-07-12 GJS4418 ROA → IAD Jul 12, 18:55 UTCJul 12, 19:35 UTC40m
2026-07-12 GJS4612 IAD → ROA Jul 12, 16:55 UTCJul 12, 17:40 UTC45m
2026-07-12 GJS4459 - Jul 12, 14:05 UTCJul 12, 15:25 UTC1h 20m
2026-07-12 GKS4398 EWR → YOW Jul 12, 11:50 UTCJul 12, 12:50 UTC1h 0m
2026-07-12 GJS4531 - Jul 12, 02:35 UTCJul 12, 03:25 UTC50m
2026-07-12 GJS4531 ORF → EWR Jul 12, 02:33 UTCJul 12, 03:25 UTC52m
2026-07-12 GJS4448 EWR → ORF Jul 12, 00:45 UTCJul 12, 01:40 UTC55m
2026-07-11 GJS4494 - Jul 11, 22:30 UTCJul 11, 23:25 UTC55m
2026-07-11 GJS4494 ACK → EWR Jul 11, 22:18 UTCJul 11, 23:23 UTC1h 5m
2026-07-11 GJS4491 - Jul 11, 17:25 UTCJul 11, 18:00 UTC35m
2026-07-11 GJS4491 EWR → ACK Jul 11, 17:24 UTCJul 11, 17:59 UTC35m
2026-07-11 GLT4184 DCA → EWR Jul 11, 14:25 UTCJul 11, 15:05 UTC40m
2026-07-11 GKS4446 EWR → DCA Jul 11, 12:30 UTCJul 11, 13:10 UTC40m
2026-07-11 GJS4167 DCA → EWR Jul 11, 10:25 UTCJul 11, 11:05 UTC40m
2026-07-11 GJS4167 DCA → EWR Jul 11, 10:17 UTCJul 11, 11:07 UTC50m
2026-07-11 GJS4457 EWR → DCA Jul 11, 03:25 UTCJul 11, 04:05 UTC40m
2026-07-10 GJS4180 DCA → EWR Jul 10, 23:10 UTCJul 10, 23:50 UTC40m
2026-07-10 GJS4486 - Jul 10, 21:05 UTCJul 10, 21:45 UTC40m
2026-07-10 GJS4442 DCA → EWR Jul 10, 18:20 UTCJul 10, 19:05 UTC45m
2026-07-10 GJS4172 EWR → DCA Jul 10, 16:35 UTCJul 10, 17:25 UTC50m
2026-07-10 GJS4430 DCA → EWR Jul 10, 14:30 UTCJul 10, 15:15 UTC45m
2026-07-10 GJS4430 DCA → EWR Jul 10, 14:19 UTCJul 10, 15:08 UTC49m
2026-07-10 GJS4437 EWR → DCA Jul 10, 12:45 UTCJul 10, 13:30 UTC45m
2026-07-10 GJS4167 DCA → EWR Jul 10, 10:10 UTCJul 10, 10:55 UTC45m
2026-07-10 GJS4167 DCA → EWR Jul 10, 10:17 UTCJul 10, 11:04 UTC47m
2026-07-09 GJS4172 EWR → DCA Jul 9, 15:35 UTCJul 9, 16:35 UTC1h 0m
2026-07-09 GJS4172 EWR → DCA Jul 9, 15:22 UTCJul 9, 16:32 UTC1h 10m
2026-07-09 GJS4430 DCA → EWR Jul 9, 13:00 UTCJul 9, 14:00 UTC1h 0m
2026-07-09 GJS4430 DCA → EWR Jul 9, 12:50 UTCJul 9, 13:57 UTC1h 7m
2026-07-09 GJS4437 - Jul 9, 11:15 UTCJul 9, 11:55 UTC40m
2026-07-09 GJS4413 - Jul 9, 00:55 UTCJul 9, 02:40 UTC1h 45m
2026-07-08 GJS4465 - Jul 8, 22:55 UTCJul 9, 00:05 UTC1h 10m
2026-07-08 GJS4597 GRR → ORD Jul 8, 20:00 UTCJul 8, 20:35 UTC35m
2026-07-08 GJS4597 GRR → ORD Jul 8, 20:04 UTCJul 8, 20:17 UTC13m
2026-07-08 GJS4598 ORD → GRR Jul 8, 18:00 UTCJul 8, 18:25 UTC25m
2026-07-08 GJS4470 - Jul 8, 14:20 UTCJul 8, 15:15 UTC55m
2026-07-08 GJS4468 - Jul 8, 02:55 UTCJul 8, 03:45 UTC50m
2026-07-07 GJS4400 - Jul 7, 21:45 UTCJul 7, 23:30 UTC1h 45m
2026-07-07 GJS4523 - Jul 7, 19:15 UTCJul 7, 20:45 UTC1h 30m
2026-07-07 GJS4395 STL → ORD Jul 7, 16:40 UTCJul 7, 17:25 UTC45m
2026-07-07 GJS4395 STL → ORD Jul 7, 16:40 UTCJul 7, 17:39 UTC59m
2026-07-07 GJS4425 IAD → STL Jul 7, 13:25 UTCJul 7, 15:05 UTC1h 40m
2026-07-07 GJS4425 IAD → STL Jul 7, 13:17 UTCJul 7, 15:03 UTC1h 46m
2026-07-06 GJS4389 - Jul 6, 19:55 UTCJul 6, 21:15 UTC1h 20m
2026-07-06 GJS4389 BTV → IAD Jul 6, 19:39 UTCJul 6, 21:14 UTC1h 35m
2026-07-06 GJS4476 IAD → BTV Jul 6, 17:45 UTCJul 6, 18:55 UTC1h 10m
2026-07-06 GJS4476 IAD → BTV Jul 6, 17:40 UTCJul 6, 19:09 UTC1h 29m

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 N551GJ page for operator, model, and routing details .

Mode-S A703C1 frequently asked

What is Mode-S code A703C1?
A703C1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N551GJ.
Where is Mode-S A703C1 registered?
Mode-S code A703C1 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 A703C1 broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A703C1, octal 51601701, decimal 10,945,473.
What flights does A703C1 operate?
Mode-S A703C1 has broadcast 20 distinct callsigns, including GJS4564, GJS4498, GJS4457, GJS4430, GJS4170.