Apparatus

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sensors Mode-S transponder

A05A48

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N12135 · EMBRAER ERJ-145XR · operated by UNITED AIRLINES INC

Hex
A05A48
Octal
50055110
Decimal
10,508,872
Country
US
Tail
N12135
Type
E45X
No current signal · last broadcast Jul 26, 20:10 UTC
Flights observed
614
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:10 UTC

Last known position

Most recent position reported by Mode-S A05A48.

Country allocation

The ICAO 24-bit address A05A48 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
UCA4839 - 8 2026-07-15
UCA4822 - 8 2026-07-12
UCA4277 - 8 2026-07-06
UCA4272 - 8 2026-06-26
UCA4852 - 7 2026-07-17
UCA4851 - 7 2026-07-02
UCA4276 - 7 2026-07-06
UCA4930 - 6 2026-06-19
UCA4921 - 6 2026-07-11
UCA4909 CommutAir 6 2026-05-26
UCA4863 - 6 2026-06-27
UCA4841 CommutAir 6 2026-06-18
UCA4832 CommutAir 6 2026-06-12
UCA4306 - 6 2026-06-26
UCA4294 - 6 2026-06-16
UCA4292 - 6 2026-07-03
UCA4273 - 6 2026-06-15
UCA4271 - 6 2026-06-26
UCA4240 - 6 2026-06-19
UCA4934 - 5 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UCA4327 IAD → SYR Jul 26, 19:20 UTCJul 26, 20:05 UTC45m
2026-07-26 UCA4349 IAD → BTV Jul 26, 17:20 UTCJul 26, 18:05 UTC45m
2026-07-26 UCA4958 GSP → IAD Jul 26, 14:50 UTCJul 26, 15:55 UTC1h 5m
2026-07-26 UCA4961 IAD → GSP Jul 26, 13:00 UTCJul 26, 14:05 UTC1h 5m
2026-07-26 UCA4939 ITH → IAD Jul 26, 10:15 UTCJul 26, 10:55 UTC40m
2026-07-26 UCA4950 IAD → ITH Jul 26, 02:55 UTCJul 26, 03:40 UTC45m
2026-07-26 UCA4950 IAD → ITH Jul 26, 02:56 UTCJul 26, 03:46 UTC50m
2026-07-25 UCA4313 PWM → IAD Jul 25, 23:45 UTCJul 26, 00:50 UTC1h 5m
2026-07-25 UCA4963 IAD → GSP Jul 25, 21:45 UTCJul 25, 22:45 UTC1h 0m
2026-07-25 UCA4328 IAD → CMH Jul 25, 19:05 UTCJul 25, 19:20 UTC15m
2026-07-25 UCA4815 IAD → CHO Jul 25, 17:15 UTCJul 25, 17:30 UTC15m
2026-07-25 UCA4332 ROA → IAD Jul 25, 14:35 UTCJul 25, 15:15 UTC40m
2026-07-25 UCA4332 ROA → IAD Jul 25, 14:44 UTCJul 25, 15:16 UTC32m
2026-07-25 UCA4368 IAD → ROA Jul 25, 13:00 UTCJul 25, 13:40 UTC40m
2026-07-25 UCA4368 IAD → ROA Jul 25, 12:51 UTCJul 25, 13:43 UTC52m
2026-07-25 UCA4251 IAD → BUF Jul 25, 10:30 UTCJul 25, 11:20 UTC50m
2026-07-25 UCA4849 OKC → IAH Jul 25, 02:30 UTCJul 25, 03:15 UTC45m
2026-07-24 UCA4829 IAD → PWM Jul 24, 23:45 UTCJul 25, 01:05 UTC1h 20m
2026-07-24 UCA4932 IAD → MHT Jul 24, 21:38 UTCJul 24, 22:30 UTC52m
2026-07-24 UCA4932 IAD → MHT Jul 24, 21:30 UTCJul 24, 22:40 UTC1h 10m
2026-07-24 UCA4230 AVP → IAD Jul 24, 19:25 UTCJul 24, 20:05 UTC40m
2026-07-24 UCA4234 COD → DEN Jul 24, 17:25 UTCJul 24, 17:55 UTC30m
2026-07-24 UCA4332 ROA → IAD Jul 24, 14:35 UTCJul 24, 15:15 UTC40m
2026-07-24 UCA4368 IAD → ROA Jul 24, 12:45 UTCJul 24, 13:20 UTC35m
2026-07-24 UCA4922 ROA → IAD Jul 24, 10:20 UTCJul 24, 10:55 UTC35m
2026-07-24 UCA4897 IAD → ROA Jul 24, 02:45 UTCJul 24, 03:25 UTC40m
2026-07-24 UCA4853 SYR → IAD Jul 24, 00:20 UTCJul 24, 01:10 UTC50m
2026-07-23 UCA4977 IAD → PVD Jul 23, 22:30 UTCJul 23, 23:15 UTC45m
2026-07-23 UCA4229 XNA → IAH Jul 23, 19:00 UTCJul 23, 20:20 UTC1h 20m
2026-07-23 UCA4288 IAD → YUL Jul 23, 16:55 UTCJul 23, 18:10 UTC1h 15m
2026-07-23 UCA4853 SYR → IAD Jul 23, 00:00 UTCJul 23, 00:55 UTC55m
2026-07-22 UCA4977 IAD → PVD Jul 22, 21:50 UTCJul 22, 22:25 UTC35m
2026-07-22 UCA4958 GSP → IAD Jul 22, 15:55 UTCJul 22, 17:10 UTC1h 15m
2026-07-22 UCA4961 - Jul 22, 13:55 UTCJul 22, 15:00 UTC1h 5m
2026-07-22 UCA4970 ALB → IAD Jul 22, 11:10 UTCJul 22, 11:40 UTC30m
2026-07-19 UCA4317 IAD → ALB Jul 19, 17:05 UTCJul 19, 18:05 UTC1h 0m
2026-07-19 UCA4857 - Jul 19, 13:40 UTCJul 19, 15:05 UTC1h 25m
2026-07-19 UCA4270 MFE → IAH Jul 19, 03:35 UTCJul 19, 04:40 UTC1h 5m
2026-07-19 UCA4235 ALB → IAD Jul 19, 00:00 UTCJul 19, 01:00 UTC1h 0m
2026-07-18 UCA4889 - Jul 18, 14:15 UTCJul 18, 15:05 UTC50m
2026-07-18 UCA4321 IAD → ALB Jul 18, 02:25 UTCJul 18, 03:20 UTC56m
2026-07-18 UCA4351 IAD → IAD Jul 18, 00:55 UTCJul 18, 01:00 UTC5m
2026-07-17 UCA4351 - Jul 17, 23:20 UTCJul 18, 00:50 UTC1h 30m
2026-07-17 UCA4351 HSV → IAD Jul 17, 23:14 UTCJul 18, 00:54 UTC1h 40m
2026-07-17 UCA4946 - Jul 17, 20:20 UTCJul 17, 21:55 UTC1h 35m
2026-07-17 UCA4329 - Jul 17, 17:15 UTCJul 17, 18:05 UTC50m
2026-07-17 UCA4813 - Jul 17, 15:15 UTCJul 17, 15:55 UTC40m
2026-07-17 UCA4852 - Jul 17, 11:30 UTCJul 17, 12:55 UTC1h 25m
2026-07-17 UCA4852 SGF → IAH Jul 17, 11:35 UTCJul 17, 12:48 UTC1h 13m
2026-07-16 UCA4867 - Jul 16, 22:25 UTCJul 16, 23:40 UTC1h 15m

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 N12135 page for operator, model, and routing details .

Mode-S A05A48 frequently asked

What is Mode-S code A05A48?
A05A48 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N12135.
Where is Mode-S A05A48 registered?
Mode-S code A05A48 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 A05A48 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A05A48, octal 50055110, decimal 10,508,872.
What flights does A05A48 operate?
Mode-S A05A48 has broadcast 20 distinct callsigns, including UCA4839, UCA4822, UCA4277, UCA4272, UCA4852.