Apparatus

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sensors Mode-S transponder

A05A68

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N12142 · EMBRAER ERJ-145XR · operated by UNITED AIRLINES INC

Hex
A05A68
Octal
50055150
Decimal
10,508,904
Country
US
Tail
N12142
Type
E45X
No current signal · last broadcast 1d ago
Flights observed
324
Distinct callsigns
20
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A05A68.

Country allocation

The ICAO 24-bit address A05A68 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
UCA4929 CommutAir 6 2026-05-19
UCA4964 CommutAir 5 2026-05-23
UCA4244 CommutAir 5 2026-05-23
UCA4966 CommutAir 4 2026-04-20
UCA4965 CommutAir 4 2026-05-25
UCA4945 CommutAir 4 2026-05-12
UCA4365 CommutAir 4 2026-05-19
UCA4335 CommutAir 4 2026-05-28
UCA4286 CommutAir 4 2026-05-06
UCA4264 CommutAir 4 2026-04-30
UCA4257 CommutAir 4 2026-05-27
UCA4253 CommutAir 4 2026-05-25
UCA4251 CommutAir 4 2026-05-27
UCA4985 CommutAir 3 2026-05-16
UCA4962 CommutAir 3 2026-05-27
UCA4954 CommutAir 3 2026-05-12
UCA4942 CommutAir 3 2026-05-22
UCA4932 CommutAir 3 2026-05-22
UCA4920 CommutAir 3 2026-05-10
UCA4901 CommutAir 3 2026-04-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-28 UCA4926 IAD → ALB May 28, 22:05 UTCMay 28, 23:05 UTC1h 0m
2026-05-28 UCA4291 IAD → YUL May 28, 19:05 UTCMay 28, 20:00 UTC55m
2026-05-28 UCA4335 IAD → BDL May 28, 17:25 UTCMay 28, 18:10 UTC45m
2026-05-28 UCA4335 IAD → BDL May 28, 17:19 UTCMay 28, 18:09 UTC50m
2026-05-28 UCA4324 IAD → BTV May 28, 15:10 UTCMay 28, 16:00 UTC50m
2026-05-28 UCA4242 CHA → TYS May 28, 12:30 UTCMay 28, 13:45 UTC1h 15m
2026-05-28 UCA4342 CHO → IAD May 28, 10:35 UTCMay 28, 10:55 UTC20m
2026-05-28 UCA4265 CVG → IAD May 28, 04:00 UTCMay 28, 04:25 UTC25m
2026-05-28 UCA4959 GSP → IAD May 28, 01:10 UTCMay 28, 02:15 UTC1h 5m
2026-05-27 UCA4962 IAD → GSP May 27, 21:10 UTCMay 27, 22:20 UTC1h 10m
2026-05-27 UCA4848 TYS → IAD May 27, 17:45 UTCMay 27, 18:45 UTC1h 0m
2026-05-27 UCA4257 CVG → IAD May 27, 13:10 UTCMay 27, 14:15 UTC1h 5m
2026-05-27 UCA4251 IAD → BUF May 27, 10:05 UTCMay 27, 10:55 UTC50m
2026-05-27 UCA4849 OKC → IAH May 27, 02:49 UTCMay 27, 03:29 UTC40m
2026-05-27 UCA4238 IAD → BTV May 27, 00:00 UTCMay 27, 01:14 UTC1h 15m
2026-05-26 UCA4302 DEN → XNA May 26, 21:40 UTCMay 26, 22:50 UTC1h 10m
2026-05-26 UCA4833 STL → IAD May 26, 19:45 UTCMay 26, 20:29 UTC45m
2026-05-26 UCA4833 STL → IAD May 26, 19:48 UTCMay 26, 20:30 UTC42m
2026-05-26 UCA4831 IAD → ROA May 26, 17:35 UTCMay 26, 18:19 UTC45m
2026-05-26 UCA4296 MOB → IAH May 26, 15:29 UTCMay 26, 16:24 UTC55m
2026-05-26 UCA4327 IAD → SYR May 26, 12:30 UTCMay 26, 13:29 UTC1h 0m
2026-05-26 UCA4267 IAD → PVD May 26, 00:04 UTCMay 26, 01:05 UTC1h 0m
2026-05-25 UCA4274 IAD → PVD May 25, 21:49 UTCMay 25, 22:55 UTC1h 5m
2026-05-25 UCA4938 SCE → IAD May 25, 19:00 UTCMay 25, 19:25 UTC24m
2026-05-25 UCA4253 DEN → SGF May 25, 17:15 UTCMay 25, 18:13 UTC58m
2026-05-25 UCA4253 DEN → SGF May 25, 17:15 UTCMay 25, 17:40 UTC25m
2026-05-25 UCA4227 AVP → IAD May 25, 14:55 UTCMay 25, 15:35 UTC40m
2026-05-25 UCA4965 IAD → AVP May 25, 12:51 UTCMay 25, 13:25 UTC34m
2026-05-25 UCA4965 IAD → AVP May 25, 12:50 UTCMay 25, 13:20 UTC30m
2026-05-25 UCA4922 ROA → IAD May 25, 10:31 UTCMay 25, 11:15 UTC44m
2026-05-25 UCA4922 ROA → IAD May 25, 10:30 UTCMay 25, 11:15 UTC45m
2026-05-25 UCA4897 IAD → ROA May 25, 03:00 UTCMay 25, 03:45 UTC45m
2026-05-25 UCA4897 IAD → ROA May 25, 02:48 UTCMay 25, 03:38 UTC50m
2026-05-24 UCA4305 IAD → CVG May 24, 23:35 UTCMay 24, 23:46 UTC11m
2026-05-24 UCA4310 IAD → BTV May 24, 21:40 UTCMay 24, 21:45 UTC5m
2026-05-24 UCA4268 MDT → IAD May 24, 19:55 UTCMay 24, 20:25 UTC30m
2026-05-24 UCA4268 MDT → IAD May 24, 19:57 UTCMay 24, 20:28 UTC31m
2026-05-24 UCA4372 IAD → MDT May 24, 17:05 UTCMay 24, 17:30 UTC25m
2026-05-24 UCA4834 PWM → IAD May 24, 15:05 UTCMay 24, 15:35 UTC30m
2026-05-24 UCA4834 PWM → IAD May 24, 15:02 UTCMay 24, 15:33 UTC31m
2026-05-24 UCA4252 ORF → IAD May 24, 03:10 UTCMay 24, 03:30 UTC20m
2026-05-23 UCA4267 IAD → PVD May 23, 23:55 UTCMay 24, 01:00 UTC1h 5m
2026-05-23 UCA4333 IAD → BDL May 23, 22:00 UTCMay 23, 22:55 UTC55m
2026-05-23 UCA4858 IAD → DAY May 23, 19:05 UTCMay 23, 20:05 UTC1h 0m
2026-05-23 UCA4843 IAD → ROC May 23, 17:05 UTCMay 23, 17:37 UTC32m
2026-05-23 UCA4843 IAD → ROC May 23, 16:55 UTCMay 23, 17:40 UTC45m
2026-05-23 UCA4850 IAH → ELP May 23, 14:40 UTCMay 23, 15:35 UTC55m
2026-05-23 UCA4860 ROC → IAD May 23, 12:40 UTCMay 23, 13:25 UTC45m
2026-05-23 UCA4244 OKC → IAH May 23, 10:25 UTCMay 23, 10:55 UTC30m
2026-05-23 UCA4964 IAD → MDT May 23, 03:15 UTCMay 23, 03:40 UTC25m

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 N12142 page for operator, model, and routing details .

Mode-S A05A68 frequently asked

What is Mode-S code A05A68?
A05A68 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N12142.
Where is Mode-S A05A68 registered?
Mode-S code A05A68 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 A05A68 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A05A68, octal 50055150, decimal 10,508,904.
What flights does A05A68 operate?
Mode-S A05A68 has broadcast 20 distinct callsigns, including UCA4929, UCA4964, UCA4244, UCA4966, UCA4965.