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sensors Mode-S transponder

A72B40

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N561GJ · BOMBARDIER Regional Jet CRJ-700 · operated by UNITED AIRLINES INC

Hex
A72B40
Octal
51625500
Decimal
10,955,584
Country
US
Tail
N561GJ
Type
CRJ7
No current signal · last broadcast Jul 26, 20:35 UTC
Flights observed
634
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:35 UTC

Last known position

Most recent position reported by Mode-S A72B40.

Country allocation

The ICAO 24-bit address A72B40 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
GJS4473 - 10 2026-07-20
GJS4446 - 9 2026-07-13
GJS4612 - 8 2026-07-17
GJS4494 - 8 2026-07-10
GJS4444 GoJet Airlines 8 2026-07-15
GJS4389 - 8 2026-07-19
GJS4575 - 7 2026-07-20
GJS4527 - 7 2026-07-22
GJS4453 - 7 2026-07-05
GJS4418 - 7 2026-07-17
GJS4396 - 7 2026-07-15
GJS4395 - 7 2026-07-01
GJS4586 - 6 2026-07-13
GJS4574 - 6 2026-07-08
GJS4558 GoJet Airlines 6 2026-06-14
GJS4553 GoJet Airlines 6 2026-07-25
GJS4517 - 6 2026-07-23
GJS4485 GoJet Airlines 6 2026-07-22
GJS4422 GoJet Airlines 6 2026-06-13
GJS4191 GoJet Airlines 6 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 GJS4383 STL → ORD Jul 26, 20:00 UTCJul 26, 20:35 UTC35m
2026-07-26 GJS4475 RIC → EWR Jul 26, 18:20 UTCJul 26, 19:00 UTC40m
2026-07-26 GJS4475 RIC → EWR Jul 26, 18:11 UTCJul 26, 18:59 UTC48m
2026-07-26 GJS4426 GSO → EWR Jul 26, 14:15 UTCJul 26, 15:45 UTC1h 30m
2026-07-25 GJS4553 ORD → LIT Jul 25, 23:57 UTCJul 26, 01:11 UTC1h 14m
2026-07-25 GJS4553 ORD → LIT Jul 25, 23:40 UTCJul 26, 00:50 UTC1h 10m
2026-07-25 GJS4533 IAD → LGA Jul 25, 21:00 UTCJul 25, 21:45 UTC45m
2026-07-25 GJS4533 IAD → LGA Jul 25, 21:00 UTCJul 25, 21:24 UTC24m
2026-07-25 GJS4488 GSP → EWR Jul 25, 19:40 UTCJul 25, 20:00 UTC20m
2026-07-25 GJS4189 PHL → EWR Jul 25, 15:10 UTCJul 25, 16:55 UTC1h 45m
2026-07-25 GJS4528 EWR → SCE Jul 25, 12:45 UTCJul 25, 14:10 UTC1h 25m
2026-07-25 GJS4458 RIC → EWR Jul 25, 10:25 UTCJul 25, 11:00 UTC35m
2026-07-25 GJS4458 RIC → EWR Jul 25, 10:17 UTCJul 25, 11:04 UTC47m
2026-07-24 GJS4417 RIC → ORD Jul 24, 23:50 UTCJul 25, 00:25 UTC35m
2026-07-24 GJS4417 RIC → ORD Jul 24, 23:44 UTCJul 25, 00:17 UTC33m
2026-07-24 GJS4597 ORD → ROA Jul 24, 22:05 UTCJul 24, 22:35 UTC30m
2026-07-24 GJS4598 ORD → ROA Jul 24, 19:35 UTCJul 24, 20:05 UTC30m
2026-07-24 GJS4600 RIC → ORD Jul 24, 16:05 UTCJul 24, 17:35 UTC1h 30m
2026-07-24 GJS4541 IAD → CVG Jul 24, 13:15 UTCJul 24, 14:30 UTC1h 15m
2026-07-24 GJS4540 TUL → ORD Jul 24, 10:10 UTCJul 24, 11:30 UTC1h 20m
2026-07-23 GJS4507 IAD → LGA Jul 23, 23:30 UTCJul 24, 00:45 UTC1h 15m
2026-07-23 GJS4441 GSO → EWR Jul 23, 20:25 UTCJul 23, 21:00 UTC35m
2026-07-23 GJS4441 GSO → EWR Jul 23, 20:10 UTCJul 23, 21:20 UTC1h 10m
2026-07-23 GJS4443 - Jul 23, 17:50 UTCJul 23, 18:55 UTC1h 5m
2026-07-23 GJS4517 - Jul 23, 15:35 UTCJul 23, 16:25 UTC50m
2026-07-22 GJS4527 - Jul 22, 23:20 UTCJul 23, 01:15 UTC1h 55m
2026-07-22 GJS4545 ORD → MLI Jul 22, 19:35 UTCJul 22, 20:50 UTC1h 15m
2026-07-22 GJS4424 EWR → CVG Jul 22, 17:30 UTCJul 22, 18:35 UTC1h 5m
2026-07-22 GJS4485 EWR → DCA Jul 22, 15:35 UTCJul 22, 16:00 UTC25m
2026-07-21 GJS3381 - Jul 21, 22:25 UTCJul 21, 22:50 UTC25m
2026-07-21 GJS3381 DCA → RIC Jul 21, 22:37 UTCJul 21, 22:46 UTC9m
2026-07-21 GJS3377 - Jul 21, 15:10 UTCJul 21, 16:45 UTC1h 35m
2026-07-21 GJS4497 - Jul 21, 13:00 UTCJul 21, 13:45 UTC45m
2026-07-21 GJS4191 RIC → EWR Jul 21, 10:45 UTCJul 21, 11:35 UTC50m
2026-07-21 GJS4385 - Jul 21, 02:10 UTCJul 21, 02:55 UTC45m
2026-07-20 GJS4575 - Jul 20, 23:55 UTCJul 21, 00:40 UTC45m
2026-07-20 GJS4575 BTV → EWR Jul 20, 23:48 UTCJul 21, 00:42 UTC54m
2026-07-20 GJS4384 IAD → YOW Jul 20, 22:00 UTCJul 20, 22:50 UTC50m
2026-07-20 GJS4384 IAD → YOW Jul 20, 21:48 UTCJul 20, 22:54 UTC1h 6m
2026-07-20 GJS4403 - Jul 20, 15:45 UTCJul 20, 16:45 UTC1h 0m
2026-07-20 GJS4403 PIT → EWR Jul 20, 15:42 UTCJul 20, 16:44 UTC1h 2m
2026-07-20 GJS4390 EWR → GSO Jul 20, 14:00 UTCJul 20, 14:50 UTC50m
2026-07-20 GJS4604 - Jul 20, 12:15 UTCJul 20, 13:00 UTC45m
2026-07-20 GJS4473 - Jul 20, 02:35 UTCJul 20, 02:55 UTC20m
2026-07-20 GJS4473 IAD → RIC Jul 20, 02:28 UTCJul 20, 02:58 UTC30m
2026-07-20 GJS4561 PWM → IAD Jul 20, 00:40 UTCJul 20, 01:10 UTC30m
2026-07-19 GJS4393 - Jul 19, 23:05 UTCJul 19, 23:40 UTC35m
2026-07-19 GJS4389 - Jul 19, 20:50 UTCJul 19, 22:05 UTC1h 15m
2026-07-19 GJS4389 BTV → IAD Jul 19, 20:45 UTCJul 19, 22:02 UTC1h 17m
2026-07-19 GJS4476 RIC → EWR Jul 19, 16:50 UTCJul 19, 17:55 UTC1h 5m

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 N561GJ page for operator, model, and routing details .

Mode-S A72B40 frequently asked

What is Mode-S code A72B40?
A72B40 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N561GJ.
Where is Mode-S A72B40 registered?
Mode-S code A72B40 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 A72B40 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A72B40, octal 51625500, decimal 10,955,584.
What flights does A72B40 operate?
Mode-S A72B40 has broadcast 20 distinct callsigns, including GJS4473, GJS4446, GJS4612, GJS4494, GJS4444.