Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A05A49

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N12136 · EMBRAER ERJ-145XR · operated by UNITED AIRLINES INC

Hex
A05A49
Octal
50055111
Decimal
10,508,873
Country
US
Tail
N12136
Type
E45X
No current signal · last broadcast 3h ago
Flights observed
517
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A05A49.

Country allocation

The ICAO 24-bit address A05A49 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
UCA4341 - 9 2026-07-12
UCA4277 - 9 2026-07-08
UCA4276 - 9 2026-07-08
UCA4247 - 9 2026-07-12
UCA4934 - 7 2026-07-09
UCA4921 - 7 2026-07-09
UCA4282 - 7 2026-07-11
UCA4914 - 6 2026-06-24
UCA4848 - 6 2026-06-25
UCA4822 - 6 2026-07-14
UCA4331 - 6 2026-07-12
UCA4301 - 6 2026-07-05
UCA4266 - 6 2026-07-11
UCA4248 - 6 2026-06-17
UCA4989 CommutAir 5 2026-07-09
UCA4984 - 5 2026-07-09
UCA4346 - 5 2026-07-08
UCA4344 CommutAir 5 2026-07-02
UCA4320 - 5 2026-07-11
UCA4312 - 5 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UCA4273 - Jul 14, 19:50 UTCJul 14, 20:45 UTC55m
2026-07-14 UCA4822 - Jul 14, 16:35 UTCJul 14, 18:00 UTC1h 25m
2026-07-14 UCA4231 - Jul 14, 14:05 UTCJul 14, 15:40 UTC1h 35m
2026-07-14 UCA4231 IAH → BHM Jul 14, 13:58 UTCJul 14, 15:32 UTC1h 34m
2026-07-14 UCA4303 - Jul 14, 00:25 UTCJul 14, 01:40 UTC1h 15m
2026-07-14 UCA4303 PNS → IAH Jul 14, 00:26 UTCJul 14, 01:40 UTC1h 14m
2026-07-13 UCA4869 - Jul 13, 22:25 UTCJul 13, 23:40 UTC1h 15m
2026-07-13 UCA4827 - Jul 13, 19:40 UTCJul 13, 21:25 UTC1h 45m
2026-07-13 UCA4827 AMA → IAH Jul 13, 19:37 UTCJul 13, 21:13 UTC1h 36m
2026-07-13 UCA4821 - Jul 13, 16:00 UTCJul 13, 17:15 UTC1h 15m
2026-07-13 UCA4299 - Jul 13, 12:15 UTCJul 13, 13:45 UTC1h 30m
2026-07-13 UCA4292 - Jul 13, 01:30 UTCJul 13, 03:05 UTC1h 35m
2026-07-12 UCA4247 - Jul 12, 23:25 UTCJul 13, 00:10 UTC45m
2026-07-12 UCA4247 CRP → IAH Jul 12, 23:12 UTCJul 13, 00:05 UTC53m
2026-07-12 UCA4341 - Jul 12, 21:50 UTCJul 12, 22:15 UTC25m
2026-07-12 UCA4341 IAH → CRP Jul 12, 21:44 UTCJul 12, 22:29 UTC45m
2026-07-12 UCA4243 - Jul 12, 19:30 UTCJul 12, 20:40 UTC1h 10m
2026-07-12 UCA4472 - Jul 12, 17:40 UTCJul 12, 18:35 UTC55m
2026-07-12 UCA4331 - Jul 12, 14:55 UTCJul 12, 15:45 UTC50m
2026-07-12 UCA4331 LFT → IAH Jul 12, 14:45 UTCJul 12, 15:42 UTC57m
2026-07-11 UCA4266 - Jul 11, 22:20 UTCJul 11, 23:00 UTC40m
2026-07-11 UCA4266 IAH → LFT Jul 11, 22:27 UTCJul 11, 23:03 UTC36m
2026-07-11 UCA4835 - Jul 11, 19:35 UTCJul 11, 20:25 UTC50m
2026-07-11 UCA4298 - Jul 11, 17:25 UTCJul 11, 18:15 UTC50m
2026-07-11 UCA4282 - Jul 11, 14:35 UTCJul 11, 15:35 UTC1h 0m
2026-07-11 UCA4282 JAN → IAH Jul 11, 14:36 UTCJul 11, 15:34 UTC58m
2026-07-11 UCA4320 - Jul 11, 01:45 UTCJul 11, 02:25 UTC40m
2026-07-09 UCA4984 - Jul 9, 23:25 UTCJul 9, 23:40 UTC15m
2026-07-09 UCA4375 - Jul 9, 21:50 UTCJul 9, 22:05 UTC15m
2026-07-09 UCA4934 - Jul 9, 19:40 UTCJul 9, 20:00 UTC20m
2026-07-09 UCA4921 - Jul 9, 17:55 UTCJul 9, 18:10 UTC15m
2026-07-09 UCA4989 MOB → IAH Jul 9, 14:30 UTCJul 9, 15:40 UTC1h 10m
2026-07-08 UCA4323 - Jul 8, 22:30 UTCJul 8, 23:25 UTC55m
2026-07-08 UCA4277 PBC → IAH Jul 8, 18:43 UTCJul 8, 20:18 UTC1h 35m
2026-07-08 UCA4277 - Jul 8, 18:30 UTCJul 8, 20:15 UTC1h 45m
2026-07-08 UCA4276 - Jul 8, 15:30 UTCJul 8, 17:25 UTC1h 55m
2026-07-08 UCA4276 IAH → PBC Jul 8, 15:26 UTCJul 8, 17:20 UTC1h 54m
2026-07-08 UCA4346 - Jul 8, 12:45 UTCJul 8, 13:40 UTC55m
2026-07-08 UCA4346 BRO → IAH Jul 8, 12:32 UTCJul 8, 13:39 UTC1h 7m
2026-07-08 UCA4309 IAH → BRO Jul 8, 01:48 UTCJul 8, 03:33 UTC1h 45m
2026-07-07 UCA4379 - Jul 7, 22:35 UTCJul 7, 23:30 UTC55m
2026-07-07 UCA4366 - Jul 7, 20:00 UTCJul 7, 20:45 UTC45m
2026-07-07 UCA4366 IAH → MFE Jul 7, 20:04 UTCJul 7, 20:49 UTC45m
2026-07-07 UCA4300 - Jul 7, 17:40 UTCJul 7, 18:55 UTC1h 15m
2026-07-07 UCA4300 LBB → IAH Jul 7, 17:39 UTCJul 7, 18:51 UTC1h 12m
2026-07-07 UCA4261 - Jul 7, 14:55 UTCJul 7, 16:05 UTC1h 10m
2026-07-07 UCA4330 - Jul 7, 13:10 UTCJul 7, 13:20 UTC10m
2026-07-07 UCA4985 - Jul 7, 02:55 UTCJul 7, 03:10 UTC15m
2026-07-07 UCA4985 IAH → LCH Jul 7, 02:47 UTCJul 7, 03:24 UTC37m
2026-07-07 UCA4247 - Jul 7, 01:10 UTCJul 7, 01:55 UTC45m

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 N12136 page for operator, model, and routing details .

Mode-S A05A49 frequently asked

What is Mode-S code A05A49?
A05A49 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N12136.
Where is Mode-S A05A49 registered?
Mode-S code A05A49 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 A05A49 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A05A49, octal 50055111, decimal 10,508,873.
What flights does A05A49 operate?
Mode-S A05A49 has broadcast 20 distinct callsigns, including UCA4341, UCA4277, UCA4276, UCA4247, UCA4934.