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sensors Mode-S transponder

A73DD3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N566GJ · operated by UNITED AIRLINES INC

Hex
A73DD3
Octal
51636723
Decimal
10,960,339
Country
US
Tail
N566GJ
Type
CRJ7
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
723
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A73DD3.

Country allocation

The ICAO 24-bit address A73DD3 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
GJS4476 - 9 2026-07-10
GJS4399 - 9 2026-07-06
GJS4184 - 9 2026-06-29
GJS4483 GoJet Airlines 8 2026-07-25
GJS4176 - 8 2026-06-30
GJS4569 - 7 2026-07-23
GJS4527 - 7 2026-07-07
GJS4513 GoJet Airlines 7 2026-06-09
GJS4447 GoJet Airlines 7 2026-07-26
GJS4434 GoJet Airlines 7 2026-07-21
GJS4389 - 7 2026-07-07
GJS4170 GoJet Airlines 7 2026-07-17
GJS4546 - 6 2026-07-11
GJS4500 - 6 2026-07-19
GJS4470 - 6 2026-06-23
GJS4453 - 6 2026-07-16
GJS4449 - 6 2026-07-17
GJS4441 GoJet Airlines 6 2026-05-30
GJS4433 - 6 2026-07-03
GJS4428 - 6 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 GJS4447 RIC → EWR Jul 26, 21:40 UTCJul 26, 22:45 UTC1h 5m
2026-07-26 GJS4501 SCE → EWR Jul 26, 19:05 UTCJul 26, 20:20 UTC1h 15m
2026-07-26 GJS4189 PHL → EWR Jul 26, 15:25 UTCJul 26, 17:10 UTC1h 45m
2026-07-26 GJS4189 PHL → EWR Jul 26, 15:17 UTCJul 26, 16:55 UTC1h 38m
2026-07-26 GJS4528 EWR → SCE Jul 26, 13:10 UTCJul 26, 14:25 UTC1h 15m
2026-07-25 GJS4483 DAY → ORD Jul 25, 23:25 UTCJul 26, 00:55 UTC1h 30m
2026-07-25 GJS4483 DAY → ORD Jul 25, 23:33 UTCJul 26, 00:41 UTC1h 8m
2026-07-25 GJS4482 BTV → IAD Jul 25, 21:10 UTCJul 25, 22:35 UTC1h 25m
2026-07-25 GJS4381 STL → ORD Jul 25, 18:05 UTCJul 25, 19:20 UTC1h 15m
2026-07-25 GJS4382 EWR → DCA Jul 25, 15:45 UTCJul 25, 16:50 UTC1h 5m
2026-07-25 GJS4522 - Jul 25, 13:10 UTCJul 25, 14:25 UTC1h 15m
2026-07-24 GJS4548 EWR → GSO Jul 24, 23:15 UTCJul 25, 00:20 UTC1h 5m
2026-07-24 GJS4564 ORD → ICT Jul 24, 20:15 UTCJul 24, 21:55 UTC1h 40m
2026-07-24 GJS4431 EWR → DCA Jul 24, 18:20 UTCJul 24, 19:35 UTC1h 15m
2026-07-24 GJS4584 IAD → EWR Jul 24, 14:35 UTCJul 24, 15:50 UTC1h 15m
2026-07-24 GJS4551 ORD → XNA Jul 24, 12:50 UTCJul 24, 13:55 UTC1h 5m
2026-07-24 GJS4415 EWR → PHL Jul 24, 09:50 UTCJul 24, 10:50 UTC1h 0m
2026-07-23 GJS4484 EWR → HHH Jul 23, 23:20 UTCJul 24, 00:05 UTC45m
2026-07-23 GJS4466 - Jul 23, 20:20 UTCJul 23, 21:40 UTC1h 20m
2026-07-23 GJS4569 - Jul 23, 17:45 UTCJul 23, 19:00 UTC1h 15m
2026-07-23 GJS4579 - Jul 23, 13:45 UTCJul 23, 15:25 UTC1h 40m
2026-07-22 GJS4412 ILM → EWR Jul 22, 23:28 UTCJul 22, 23:52 UTC24m
2026-07-22 GJS4412 ILM → EWR Jul 22, 23:10 UTCJul 22, 23:55 UTC45m
2026-07-22 GJS4533 IAD → LGA Jul 22, 21:00 UTCJul 22, 21:35 UTC35m
2026-07-22 GJS4488 GSP → EWR Jul 22, 19:25 UTCJul 22, 19:45 UTC20m
2026-07-22 GJS4488 GSP → EWR Jul 22, 19:26 UTCJul 22, 19:51 UTC25m
2026-07-22 GJS4439 FSD → ORD Jul 22, 16:25 UTCJul 22, 17:35 UTC1h 10m
2026-07-22 GJS4462 EWR → GSO Jul 22, 14:10 UTCJul 22, 15:25 UTC1h 15m
2026-07-22 GJS4440 EWR → ITH Jul 22, 11:35 UTCJul 22, 12:05 UTC30m
2026-07-22 GJS4603 MSN → ORD Jul 22, 04:00 UTCJul 22, 04:25 UTC25m
2026-07-21 GJS4434 DCA → EWR Jul 21, 23:20 UTCJul 22, 01:20 UTC2h 0m
2026-07-21 GJS4465 - Jul 21, 20:00 UTCJul 21, 21:10 UTC1h 10m
2026-07-21 GJS4407 EWR → PQI Jul 21, 14:35 UTCJul 21, 16:15 UTC1h 40m
2026-07-21 GJS4596 MDT → ORD Jul 21, 12:15 UTCJul 21, 13:20 UTC1h 5m
2026-07-21 GJS4458 - Jul 21, 10:25 UTCJul 21, 11:05 UTC40m
2026-07-21 GJS4417 ORD → GRR Jul 21, 00:30 UTCJul 21, 01:00 UTC30m
2026-07-20 GJS4417 ORD → GRR Jul 20, 23:47 UTCJul 21, 00:54 UTC1h 7m
2026-07-20 GJS4597 ORD → ROA Jul 20, 21:45 UTCJul 20, 22:30 UTC45m
2026-07-20 GJS4597 ORD → ROA Jul 20, 21:45 UTCJul 20, 22:04 UTC19m
2026-07-20 GJS4598 ORD → ROA Jul 20, 20:25 UTCJul 20, 21:00 UTC35m
2026-07-20 GJS4395 CVG → EWR Jul 20, 16:40 UTCJul 20, 17:30 UTC50m
2026-07-20 GJS4613 - Jul 20, 14:55 UTCJul 20, 15:40 UTC45m
2026-07-20 GJS4440 EWR → ITH Jul 20, 11:40 UTCJul 20, 12:10 UTC30m
2026-07-20 GJS4440 EWR → ITH Jul 20, 11:50 UTCJul 20, 12:01 UTC11m
2026-07-20 GJS4603 MSN → ORD Jul 20, 03:35 UTCJul 20, 04:05 UTC30m
2026-07-19 GJS4483 - Jul 19, 23:30 UTCJul 20, 01:00 UTC1h 30m
2026-07-19 GJS4482 - Jul 19, 21:20 UTCJul 19, 22:45 UTC1h 25m
2026-07-19 GJS4571 - Jul 19, 18:05 UTCJul 19, 19:30 UTC1h 25m
2026-07-19 GJS4543 ORD → CHA Jul 19, 15:40 UTCJul 19, 16:45 UTC1h 5m
2026-07-19 GJS4480 - Jul 19, 12:25 UTCJul 19, 14:00 UTC1h 35m

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 N566GJ page for operator, model, and routing details .

Mode-S A73DD3 frequently asked

What is Mode-S code A73DD3?
A73DD3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N566GJ.
Where is Mode-S A73DD3 registered?
Mode-S code A73DD3 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 A73DD3 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A73DD3, octal 51636723, decimal 10,960,339.
What flights does A73DD3 operate?
Mode-S A73DD3 has broadcast 20 distinct callsigns, including GJS4476, GJS4399, GJS4184, GJS4483, GJS4176.