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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 6h ago
Flights observed
547
Distinct callsigns
20
Country
US
Last broadcast
6h ago

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
UCA4822 - 8 2026-07-12
UCA4277 - 8 2026-07-06
UCA4272 - 8 2026-06-26
UCA4851 - 7 2026-07-02
UCA4839 CommutAir 7 2026-06-08
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
UCA4859 CommutAir 5 2026-05-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 UCA4323 - Jul 13, 23:50 UTCJul 14, 00:50 UTC1h 0m
2026-07-13 UCA4323 IAH → MOB Jul 13, 23:54 UTCJul 14, 00:47 UTC53m
2026-07-13 UCA4326 - Jul 13, 22:00 UTCJul 13, 22:45 UTC45m
2026-07-13 UCA4326 BTR → IAH Jul 13, 21:59 UTCJul 13, 22:47 UTC48m
2026-07-13 UCA4336 - Jul 13, 18:55 UTCJul 13, 19:45 UTC50m
2026-07-13 UCA4373 - Jul 13, 14:50 UTCJul 13, 16:05 UTC1h 15m
2026-07-12 UCA5004 - Jul 12, 23:40 UTCJul 13, 00:40 UTC1h 0m
2026-07-12 UCA4377 - Jul 12, 21:20 UTCJul 12, 22:00 UTC40m
2026-07-12 UCA4825 - Jul 12, 19:35 UTCJul 12, 20:20 UTC45m
2026-07-12 UCA4825 IAH → CRP Jul 12, 19:39 UTCJul 12, 20:16 UTC37m
2026-07-12 UCA4822 - Jul 12, 16:30 UTCJul 12, 17:50 UTC1h 20m
2026-07-12 UCA4822 BHM → IAH Jul 12, 16:36 UTCJul 12, 17:57 UTC1h 21m
2026-07-12 UCA4231 - Jul 12, 12:50 UTCJul 12, 14:15 UTC1h 25m
2026-07-11 UCA4934 - Jul 11, 19:45 UTCJul 11, 20:00 UTC15m
2026-07-11 UCA4921 - Jul 11, 17:50 UTCJul 11, 18:05 UTC15m
2026-07-11 UCA4269 - Jul 11, 14:15 UTCJul 11, 15:50 UTC1h 35m
2026-07-10 UCA4284 - Jul 10, 23:45 UTCJul 11, 01:10 UTC1h 25m
2026-07-10 UCA4284 IAH → HSV Jul 10, 23:57 UTCJul 11, 01:07 UTC1h 10m
2026-07-10 UCA4980 - Jul 10, 19:55 UTCJul 10, 20:40 UTC45m
2026-07-10 UCA4287 - Jul 10, 17:45 UTCJul 10, 18:50 UTC1h 5m
2026-07-10 UCA4287 IAH → HRL Jul 10, 17:33 UTCJul 10, 18:48 UTC1h 15m
2026-07-10 UCA4947 - Jul 10, 14:45 UTCJul 10, 15:35 UTC50m
2026-07-10 UCA4947 BTR → IAH Jul 10, 14:47 UTCJul 10, 15:44 UTC57m
2026-07-10 UCA4260 - Jul 10, 13:05 UTCJul 10, 13:50 UTC45m
2026-07-10 UCA4941 - Jul 10, 10:20 UTCJul 10, 11:05 UTC45m
2026-07-10 UCA4941 BTR → IAH Jul 10, 10:12 UTCJul 10, 11:06 UTC54m
2026-07-10 UCA4828 - Jul 10, 02:55 UTCJul 10, 03:35 UTC40m
2026-07-10 UCA4363 - Jul 10, 00:55 UTCJul 10, 01:40 UTC45m
2026-07-10 UCA4363 CRP → IAH Jul 10, 01:00 UTCJul 10, 01:32 UTC32m
2026-07-09 UCA4811 - Jul 9, 23:15 UTCJul 9, 23:50 UTC35m
2026-07-09 UCA4345 - Jul 9, 21:15 UTCJul 9, 22:05 UTC50m
2026-07-09 UCA4352 - Jul 9, 19:30 UTCJul 9, 20:00 UTC30m
2026-07-09 UCA4352 IAH → BTR Jul 9, 19:39 UTCJul 9, 20:13 UTC34m
2026-07-09 UCA4329 - Jul 9, 17:25 UTCJul 9, 18:15 UTC50m
2026-07-09 UCA4329 BRO → IAH Jul 9, 17:28 UTCJul 9, 18:18 UTC50m
2026-07-09 UCA4813 - Jul 9, 15:10 UTCJul 9, 15:55 UTC45m
2026-07-09 UCA4226 - Jul 9, 12:25 UTCJul 9, 13:25 UTC1h 0m
2026-07-09 UCA4892 - Jul 9, 03:00 UTCJul 9, 03:50 UTC50m
2026-07-09 UCA4363 - Jul 9, 01:15 UTCJul 9, 01:55 UTC40m
2026-07-09 UCA4363 CRP → IAH Jul 9, 01:00 UTCJul 9, 01:54 UTC54m
2026-07-08 UCA4811 - Jul 8, 23:40 UTCJul 9, 00:20 UTC40m
2026-07-08 UCA4377 - Jul 8, 22:05 UTCJul 8, 22:45 UTC40m
2026-07-08 UCA4825 - Jul 8, 19:30 UTCJul 8, 20:10 UTC40m
2026-07-08 UCA4928 - Jul 8, 17:15 UTCJul 8, 18:00 UTC45m
2026-07-08 UCA4894 - Jul 8, 15:40 UTCJul 8, 16:20 UTC40m
2026-07-07 UCA4816 - Jul 7, 20:05 UTCJul 7, 21:15 UTC1h 10m
2026-07-07 UCA4821 - Jul 7, 15:25 UTCJul 7, 16:30 UTC1h 5m
2026-07-07 UCA4852 - Jul 7, 11:55 UTCJul 7, 13:25 UTC1h 30m
2026-07-07 UCA4852 SGF → IAH Jul 7, 12:10 UTCJul 7, 13:26 UTC1h 16m
2026-07-06 UCA4867 - Jul 6, 23:35 UTCJul 7, 01:00 UTC1h 25m

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 6h ago.
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 UCA4822, UCA4277, UCA4272, UCA4851, UCA4839.