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 2h ago
Flights observed
358
Distinct callsigns
20
Country
US
Last broadcast
2h 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 8 2026-05-16
GJS4441 GoJet Airlines 7 2026-05-11
GJS4554 GoJet Airlines 6 2026-05-15
GJS4604 GoJet Airlines 5 2026-05-14
GJS4556 GoJet Airlines 5 2026-05-09
GJS4514 GoJet Airlines 5 2026-05-22
GJS4507 GoJet Airlines 5 2026-05-22
GJS4472 GoJet Airlines 5 2026-05-25
GJS4415 GoJet Airlines 5 2026-05-25
GJS4409 GoJet Airlines 5 2026-05-15
GJS4380 GoJet Airlines 5 2026-05-11
GJS4170 GoJet Airlines 5 2026-05-11
GJS4566 GoJet Airlines 4 2026-05-21
GJS4518 GoJet Airlines 4 2026-05-25
GJS4515 GoJet Airlines 4 2026-05-23
GJS4505 GoJet Airlines 4 2026-05-21
GJS4498 GoJet Airlines 4 2026-05-18
GJS4495 GoJet Airlines 4 2026-04-27
GJS4475 GoJet Airlines 4 2026-05-19
GJS4412 GoJet Airlines 4 2026-05-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 GJS4428 DCA → EWR May 29, 22:15 UTCMay 29, 22:55 UTC40m
2026-05-29 GJS4618 SYR → EWR May 29, 19:45 UTCMay 29, 20:15 UTC30m
2026-05-29 GJS4618 SYR → EWR May 29, 19:43 UTCMay 29, 20:04 UTC21m
2026-05-29 GJS4488 GSP → EWR May 29, 18:16 UTCMay 29, 18:51 UTC35m
2026-05-29 GJS4488 GSP → EWR May 29, 17:55 UTCMay 29, 18:15 UTC20m
2026-05-29 GJS4578 PHL → IAD May 29, 14:55 UTCMay 29, 16:15 UTC1h 20m
2026-05-29 GJS4548 EWR → GSO May 29, 12:50 UTCMay 29, 13:50 UTC1h 0m
2026-05-27 GJS4477 AVL → EWR May 27, 19:10 UTCMay 27, 19:40 UTC30m
2026-05-27 GJS4471 DCA → EWR May 27, 17:35 UTCMay 27, 18:10 UTC35m
2026-05-27 GJS4596 MDT → ORD May 27, 15:35 UTCMay 27, 16:35 UTC1h 0m
2026-05-27 GJS4474 PHL → EWR May 27, 13:35 UTCMay 27, 14:25 UTC50m
2026-05-27 GJS4402 IAD → EWR May 27, 11:35 UTCMay 27, 12:35 UTC1h 0m
2026-05-26 GJS4165 AVP → EWR May 26, 22:09 UTCMay 26, 22:54 UTC45m
2026-05-26 GJS4606 STL → ORD May 26, 20:17 UTCMay 26, 20:28 UTC11m
2026-05-26 GJS4606 STL → ORD May 26, 20:05 UTCMay 26, 20:54 UTC50m
2026-05-26 GJS4588 EWR → RIC May 26, 18:24 UTCMay 26, 18:59 UTC35m
2026-05-26 GJS4569 ORF → EWR May 26, 14:40 UTCMay 26, 16:10 UTC1h 30m
2026-05-26 GJS4569 ORF → EWR May 26, 14:49 UTCMay 26, 16:21 UTC1h 32m
2026-05-26 GJS4524 EWR → GSO May 26, 11:54 UTCMay 26, 13:19 UTC1h 25m
2026-05-26 GJS4411 DCA → EWR May 26, 00:14 UTCMay 26, 01:10 UTC55m
2026-05-25 GJS4518 ORD → STL May 25, 22:15 UTCMay 25, 23:04 UTC50m
2026-05-25 GJS4392 LGA → IAD May 25, 19:40 UTCMay 25, 20:09 UTC30m
2026-05-25 GJS4392 LGA → IAD May 25, 19:50 UTCMay 25, 20:01 UTC11m
2026-05-25 GJS4472 ALB → EWR May 25, 18:10 UTCMay 25, 18:45 UTC35m
2026-05-25 GJS4472 ALB → EWR May 25, 18:24 UTCMay 25, 18:39 UTC15m
2026-05-25 GJS4415 EWR → PHL May 25, 14:25 UTCMay 25, 15:30 UTC1h 5m
2026-05-25 GJS4610 ITH → EWR May 25, 12:20 UTCMay 25, 13:10 UTC50m
2026-05-25 GJT4510 - May 25, 09:30 UTCMay 25, 10:25 UTC55m
2026-05-25 GJS4618 SYR → EWR May 25, 01:55 UTCMay 25, 02:25 UTC30m
2026-05-24 GJS4536 PWM → IAD May 24, 23:15 UTCMay 24, 23:46 UTC31m
2026-05-24 GJS4552 IAD → SYR May 24, 21:30 UTCMay 24, 21:45 UTC15m
2026-05-24 GJS4412 ILM → EWR May 24, 19:10 UTCMay 24, 20:15 UTC1h 5m
2026-05-24 GJS4412 ILM → EWR May 24, 19:12 UTCMay 24, 19:45 UTC33m
2026-05-24 GJS4559 PHL → EWR May 24, 16:50 UTCMay 24, 17:35 UTC45m
2026-05-24 GJS4173 DCA → EWR May 24, 13:10 UTCMay 24, 14:30 UTC1h 20m
2026-05-24 GJS4183 EWR → RIC May 24, 03:02 UTCMay 24, 04:06 UTC1h 4m
2026-05-24 GJS4183 EWR → RIC May 24, 02:55 UTCMay 24, 04:00 UTC1h 5m
2026-05-23 GJS4515 ORD → LEX May 23, 23:05 UTCMay 24, 00:30 UTC1h 25m
2026-05-23 GJS4515 ORD → LEX May 23, 23:03 UTCMay 24, 00:10 UTC1h 7m
2026-05-23 GJS4547 IAD → PVD May 23, 19:00 UTCMay 23, 20:15 UTC1h 15m
2026-05-23 GJS4547 IAD → PVD May 23, 19:03 UTCMay 23, 20:17 UTC1h 14m
2026-05-23 GJS4562 EWR → GSO May 23, 16:39 UTCMay 23, 16:51 UTC12m
2026-05-23 GJS4562 EWR → GSO May 23, 16:20 UTCMay 23, 17:05 UTC45m
2026-05-23 GJS4169 EWR → DCA May 23, 14:50 UTCMay 23, 15:20 UTC30m
2026-05-23 GJS4540 TUL → ORD May 23, 11:20 UTCMay 23, 12:40 UTC1h 20m
2026-05-22 GJS4507 IAD → LGA May 22, 23:23 UTCMay 23, 00:17 UTC54m
2026-05-22 GJS4507 IAD → LGA May 22, 23:10 UTCMay 23, 00:20 UTC1h 10m
2026-05-22 GJS4602 EWR → DCA May 22, 20:05 UTCMay 22, 20:35 UTC30m
2026-05-22 GJS4602 EWR → DCA May 22, 19:51 UTCMay 22, 20:20 UTC29m
2026-05-22 GJS4519 ORD → SCE May 22, 18:10 UTCMay 22, 18:40 UTC30m

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 2h 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, GJS4441, GJS4554, GJS4604, GJS4556.