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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
Broadcasting now · callsign GJS4557 · 5,425 ft
Flights observed
643
Distinct callsigns
20
Country
US
Last broadcast
14h ago

Current position

A73DD3 is currently broadcasting. Map zoomed to live position.

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
GJS4176 - 8 2026-06-30
GJS4527 - 7 2026-07-07
GJS4513 GoJet Airlines 7 2026-06-09
GJS4389 - 7 2026-07-07
GJS4569 - 6 2026-07-13
GJS4546 - 6 2026-07-11
GJS4470 - 6 2026-06-23
GJS4441 GoJet Airlines 6 2026-05-30
GJS4434 - 6 2026-06-21
GJS4433 - 6 2026-07-03
GJS4428 - 6 2026-07-10
GJS4418 - 6 2026-07-10
GJS4401 - 6 2026-07-03
GJS4386 - 6 2026-07-03
GJS4173 GoJet Airlines 6 2026-06-01
GJS4170 GoJet Airlines 6 2026-06-21
GJS4611 GoJet Airlines 5 2026-05-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 GJS4179 - Jul 13, 23:35 UTCJul 14, 00:05 UTC30m
2026-07-13 GJS4466 - Jul 13, 21:10 UTCJul 13, 22:15 UTC1h 5m
2026-07-13 GJS4466 SGF → ORD Jul 13, 20:58 UTCJul 13, 22:05 UTC1h 7m
2026-07-13 GJS4569 - Jul 13, 18:55 UTCJul 13, 20:05 UTC1h 10m
2026-07-13 GJS4579 - Jul 13, 13:45 UTCJul 13, 15:50 UTC2h 5m
2026-07-12 GJS4416 ORD → STL Jul 12, 21:35 UTCJul 12, 22:15 UTC40m
2026-07-12 GJS4404 - Jul 12, 18:10 UTCJul 12, 19:20 UTC1h 10m
2026-07-12 GJS4502 - Jul 12, 16:20 UTCJul 12, 17:15 UTC55m
2026-07-12 GJS4502 ORD → LEX Jul 12, 16:13 UTCJul 12, 17:14 UTC1h 1m
2026-07-12 GJS4480 - Jul 12, 13:10 UTCJul 12, 14:35 UTC1h 25m
2026-07-12 GJS4500 - Jul 12, 02:01 UTCJul 12, 02:45 UTC45m
2026-07-12 GJS4500 ORD → HSV Jul 12, 01:57 UTCJul 12, 03:13 UTC1h 16m
2026-07-11 GJS4400 - Jul 11, 23:00 UTCJul 12, 00:50 UTC1h 50m
2026-07-11 GJS4523 - Jul 11, 20:35 UTCJul 11, 22:10 UTC1h 35m
2026-07-11 GJS4395 STL → ORD Jul 11, 17:40 UTCJul 11, 18:45 UTC1h 5m
2026-07-11 GJS4395 STL → ORD Jul 11, 17:25 UTCJul 11, 18:17 UTC52m
2026-07-11 GJS4425 IAD → STL Jul 11, 13:25 UTCJul 11, 15:25 UTC2h 0m
2026-07-11 GJS4498 - Jul 11, 10:30 UTCJul 11, 11:20 UTC50m
2026-07-11 GJS4546 IAD → BUF Jul 11, 02:55 UTCJul 11, 03:45 UTC50m
2026-07-11 GJS4593 - Jul 11, 00:25 UTCJul 11, 01:20 UTC55m
2026-07-10 GJS4588 IAD → CMH Jul 10, 21:55 UTCJul 10, 22:55 UTC1h 0m
2026-07-10 GJS4387 - Jul 10, 19:10 UTCJul 10, 20:05 UTC55m
2026-07-10 GJS4387 CMH → IAD Jul 10, 19:09 UTCJul 10, 20:01 UTC52m
2026-07-10 GJS4420 IAD → CMH Jul 10, 17:50 UTCJul 10, 18:13 UTC23m
2026-07-10 GJS4420 - Jul 10, 17:25 UTCJul 10, 18:10 UTC45m
2026-07-10 GJS4420 - Jul 10, 17:10 UTCJul 10, 17:20 UTC10m
2026-07-10 GJS4476 ROC → IAD Jul 10, 14:45 UTCJul 10, 15:40 UTC55m
2026-07-10 GJS4615 - Jul 10, 12:55 UTCJul 10, 13:45 UTC50m
2026-07-10 GJS4615 IAD → ROC Jul 10, 12:46 UTCJul 10, 13:39 UTC53m
2026-07-10 GJS4428 CMH → IAD Jul 10, 10:45 UTCJul 10, 11:40 UTC55m
2026-07-10 GJS4428 CMH → IAD Jul 10, 10:18 UTCJul 10, 11:53 UTC1h 35m
2026-07-10 GJS4414 IAD → CMH Jul 10, 08:15 UTCJul 10, 09:05 UTC50m
2026-07-10 GJS4455 - Jul 10, 05:35 UTCJul 10, 06:50 UTC1h 15m
2026-07-10 GJS4455 YOW → IAD Jul 10, 05:19 UTCJul 10, 06:44 UTC1h 25m
2026-07-10 GJS4418 IAD → YOW Jul 10, 03:00 UTCJul 10, 04:30 UTC1h 30m
2026-07-10 GJS4387 - Jul 10, 00:40 UTCJul 10, 01:30 UTC50m
2026-07-09 GJS4420 IAD → CMH Jul 9, 17:10 UTCJul 9, 18:00 UTC50m
2026-07-09 GJS4476 ROC → IAD Jul 9, 14:30 UTCJul 9, 15:20 UTC50m
2026-07-09 GJS4615 IAD → ROC Jul 9, 12:45 UTCJul 9, 13:40 UTC55m
2026-07-09 GJS4578 ROC → IAD Jul 9, 10:15 UTCJul 9, 11:05 UTC50m
2026-07-09 GJS4394 IAD → ROC Jul 9, 02:55 UTCJul 9, 03:30 UTC35m
2026-07-09 GJS4394 IAD → ROC Jul 9, 02:50 UTCJul 9, 03:35 UTC45m
2026-07-08 GJS4455 YOW → IAD Jul 8, 23:50 UTCJul 9, 01:00 UTC1h 10m
2026-07-08 GJS4418 - Jul 8, 21:15 UTCJul 8, 22:20 UTC1h 5m
2026-07-08 GJS4418 - Jul 8, 18:35 UTCJul 8, 19:15 UTC40m
2026-07-08 GJS4612 IAD → ROA Jul 8, 16:55 UTCJul 8, 17:40 UTC45m
2026-07-08 GJS4506 STL → IAD Jul 8, 14:00 UTCJul 8, 15:40 UTC1h 40m
2026-07-07 GJS4527 IAD → STL Jul 7, 22:30 UTCJul 8, 00:10 UTC1h 40m
2026-07-07 GJS4389 - Jul 7, 19:10 UTCJul 7, 20:30 UTC1h 20m
2026-07-07 GJS4476 - Jul 7, 16:55 UTCJul 7, 18:05 UTC1h 10m

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?
Yes. Mode-S A73DD3 is currently airborne.
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, GJS4176, GJS4527.