Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A05A6B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N12145 · EMBRAER ERJ-145XR · operated by UNITED AIRLINES INC

Hex
A05A6B
Octal
50055153
Decimal
10,508,907
Country
US
Tail
N12145
Type
E45X
Broadcasting now · callsign UCA4241 · 3,800 ft
Flights observed
580
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:35 UTC

Current position

A05A6B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A05A6B 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
UCA4276 - 10 2026-07-07
UCA4282 CommutAir 9 2026-07-26
UCA4258 CommutAir 9 2026-07-24
UCA4293 CommutAir 8 2026-07-24
UCA4277 - 8 2026-07-07
UCA4821 - 7 2026-07-03
UCA4365 - 7 2026-07-01
UCA4318 - 7 2026-07-18
UCA4297 - 7 2026-07-04
UCA4977 - 6 2026-07-14
UCA4961 - 6 2026-07-21
UCA4839 - 6 2026-07-06
UCA4814 CommutAir 6 2026-06-17
UCA4348 - 6 2026-06-17
UCA4340 CommutAir 6 2026-07-18
UCA4228 CommutAir 6 2026-06-12
UCA4929 - 5 2026-07-01
UCA4909 CommutAir 5 2026-07-23
UCA4853 - 5 2026-07-15
UCA4852 - 5 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UCA4379 IAH → BTR Jul 26, 21:45 UTCJul 26, 22:35 UTC50m
2026-07-26 UCA4366 IAH → LRD Jul 26, 19:45 UTCJul 26, 20:30 UTC45m
2026-07-26 UCA4282 IAD → TYS Jul 26, 14:35 UTCJul 26, 14:45 UTC10m
2026-07-26 UCA4282 IAD → TYS Jul 26, 14:36 UTCJul 26, 15:25 UTC49m
2026-07-26 UCA4320 IAH → JAN Jul 26, 02:05 UTCJul 26, 02:50 UTC45m
2026-07-25 UCA4842 - Jul 25, 22:20 UTCJul 25, 23:45 UTC1h 25m
2026-07-25 UCA4902 IAD → PHL Jul 25, 19:40 UTCJul 25, 21:00 UTC1h 20m
2026-07-25 UCA4851 - Jul 25, 16:55 UTCJul 25, 18:20 UTC1h 25m
2026-07-25 UCA4225 IAH → LCH Jul 25, 14:20 UTCJul 25, 15:45 UTC1h 25m
2026-07-25 UCA4225 IAH → LCH Jul 25, 14:29 UTCJul 25, 15:43 UTC1h 14m
2026-07-25 UCA4330 LCH → IAH Jul 25, 12:45 UTCJul 25, 13:05 UTC20m
2026-07-25 UCA4985 IAH → LCH Jul 25, 01:50 UTCJul 25, 02:10 UTC20m
2026-07-25 UCA4985 IAH → LCH Jul 25, 01:53 UTCJul 25, 02:15 UTC22m
2026-07-24 UCA4303 PNS → IAH Jul 24, 21:50 UTCJul 24, 23:05 UTC1h 15m
2026-07-24 UCA4869 IAD → BTV Jul 24, 19:30 UTCJul 24, 20:40 UTC1h 10m
2026-07-24 UCA4258 CVG → IAD Jul 24, 16:45 UTCJul 24, 18:05 UTC1h 20m
2026-07-24 UCA4258 CVG → IAD Jul 24, 16:48 UTCJul 24, 18:18 UTC1h 30m
2026-07-24 UCA4293 IAH → PNS Jul 24, 13:10 UTCJul 24, 14:30 UTC1h 20m
2026-07-23 UCA4111 MOT → IAH Jul 23, 23:16 UTCJul 24, 02:06 UTC2h 50m
2026-07-23 UCA4111 MOT → IAH Jul 23, 19:05 UTCJul 24, 02:05 UTC7h 0m
2026-07-23 UCA4909 HSV → IAH Jul 23, 16:25 UTCJul 23, 17:55 UTC1h 30m
2026-07-23 UCA4262 IAD → STL Jul 23, 13:17 UTCJul 23, 15:13 UTC1h 56m
2026-07-23 UCA4262 IAD → STL Jul 23, 13:40 UTCJul 23, 15:10 UTC1h 30m
2026-07-23 UCA4311 - Jul 23, 10:05 UTCJul 23, 11:15 UTC1h 10m
2026-07-23 UCA4304 IAD → PHL Jul 23, 02:35 UTCJul 23, 03:50 UTC1h 15m
2026-07-22 UCA4313 PWM → IAD Jul 22, 23:50 UTCJul 23, 00:45 UTC55m
2026-07-22 UCA4313 PWM → IAD Jul 22, 23:53 UTCJul 23, 00:52 UTC59m
2026-07-22 UCA4963 IAD → GSP Jul 22, 21:50 UTCJul 22, 22:50 UTC1h 0m
2026-07-22 UCA4963 IAD → GSP Jul 22, 21:43 UTCJul 22, 22:52 UTC1h 9m
2026-07-22 UCA4362 ORF → IAD Jul 22, 19:00 UTCJul 22, 19:55 UTC55m
2026-07-22 UCA4360 IAD → SYR Jul 22, 17:05 UTCJul 22, 17:45 UTC40m
2026-07-22 UCA4834 - Jul 22, 15:05 UTCJul 22, 15:30 UTC25m
2026-07-22 UCA4319 - Jul 22, 13:05 UTCJul 22, 13:30 UTC25m
2026-07-22 UCA4244 OKC → IAH Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-22 UCA4964 IAD → MDT Jul 22, 02:50 UTCJul 22, 03:15 UTC25m
2026-07-21 UCA4958 - Jul 21, 14:30 UTCJul 21, 15:45 UTC1h 15m
2026-07-21 UCA4961 IAD → GSP Jul 21, 12:36 UTCJul 21, 13:29 UTC53m
2026-07-21 UCA4961 - Jul 21, 12:30 UTCJul 21, 13:25 UTC55m
2026-07-21 UCA4244 OKC → IAH Jul 21, 10:25 UTCJul 21, 10:55 UTC30m
2026-07-21 UCA4244 OKC → IAH Jul 21, 10:31 UTCJul 21, 10:57 UTC26m
2026-07-21 UCA4964 - Jul 21, 03:25 UTCJul 21, 03:55 UTC30m
2026-07-21 UCA4964 IAD → MDT Jul 21, 02:53 UTCJul 21, 03:48 UTC55m
2026-07-20 UCA4328 IAD → CMH Jul 20, 19:05 UTCJul 20, 19:25 UTC20m
2026-07-20 UCA4815 IAD → CHO Jul 20, 17:35 UTCJul 20, 17:50 UTC15m
2026-07-20 UCA4227 - Jul 20, 14:40 UTCJul 20, 15:25 UTC45m
2026-07-20 UCA4965 IAD → AVP Jul 20, 12:45 UTCJul 20, 13:20 UTC35m
2026-07-20 UCA4922 ROA → IAD Jul 20, 10:20 UTCJul 20, 11:05 UTC45m
2026-07-20 UCA4897 IAD → ROA Jul 20, 03:00 UTCJul 20, 03:35 UTC35m
2026-07-20 UCA4259 - Jul 20, 00:10 UTCJul 20, 00:45 UTC35m
2026-07-20 UCA4259 CAE → IAD Jul 20, 00:14 UTCJul 20, 01:40 UTC1h 26m

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 N12145 page for operator, model, and routing details .

Mode-S A05A6B frequently asked

What is Mode-S code A05A6B?
A05A6B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N12145.
Where is Mode-S A05A6B registered?
Mode-S code A05A6B 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 A05A6B broadcasting right now?
Yes. Mode-S A05A6B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A05A6B, octal 50055153, decimal 10,508,907.
What flights does A05A6B operate?
Mode-S A05A6B has broadcast 20 distinct callsigns, including UCA4276, UCA4282, UCA4258, UCA4293, UCA4277.