Apparatus

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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 Jul 26, 21:00 UTC
Flights observed
590
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:00 UTC

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
UCA4276 CommutAir 16 2026-07-23
UCA4277 CommutAir 14 2026-07-23
UCA4341 - 9 2026-07-12
UCA4247 - 9 2026-07-12
UCA4331 CommutAir 8 2026-07-24
UCA4934 - 7 2026-07-09
UCA4921 - 7 2026-07-09
UCA4301 CommutAir 7 2026-07-21
UCA4282 - 7 2026-07-11
UCA4266 CommutAir 7 2026-07-23
UCA4984 CommutAir 6 2026-07-24
UCA4914 - 6 2026-06-24
UCA4848 - 6 2026-06-25
UCA4837 CommutAir 6 2026-07-26
UCA4822 - 6 2026-07-14
UCA4248 - 6 2026-06-17
UCA4989 CommutAir 5 2026-07-09
UCA4923 CommutAir 5 2026-07-21
UCA4844 CommutAir 5 2026-07-23
UCA4378 CommutAir 5 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UCA4307 BTV → IAD Jul 26, 19:55 UTCJul 26, 21:00 UTC1h 5m
2026-07-26 UCA4830 LIT → IAH Jul 26, 17:35 UTCJul 26, 18:30 UTC55m
2026-07-26 UCA4371 IAD → BDL Jul 26, 15:00 UTCJul 26, 15:46 UTC46m
2026-07-26 UCA4837 BTR → IAH Jul 26, 12:20 UTCJul 26, 13:20 UTC1h 0m
2026-07-26 UCA4337 TUL → IAH Jul 26, 01:20 UTCJul 26, 02:20 UTC1h 0m
2026-07-26 UCA4337 TUL → IAH Jul 26, 01:32 UTCJul 26, 02:19 UTC47m
2026-07-25 UCA4841 TYS → IAH Jul 25, 22:20 UTCJul 25, 23:25 UTC1h 5m
2026-07-25 UCA4850 IAH → ELP Jul 25, 20:20 UTCJul 25, 21:25 UTC1h 5m
2026-07-25 UCA4378 PVD → IAD Jul 25, 17:50 UTCJul 25, 19:10 UTC1h 20m
2026-07-25 UCA4358 IAD → PVD Jul 25, 15:35 UTCJul 25, 16:50 UTC1h 15m
2026-07-24 UCA4984 IAH → AMA Jul 24, 23:35 UTCJul 24, 23:55 UTC20m
2026-07-24 UCA4375 BTR → IAH Jul 24, 22:19 UTCJul 24, 22:38 UTC19m
2026-07-24 UCA4859 LBB → IAH Jul 24, 19:45 UTCJul 24, 21:00 UTC1h 15m
2026-07-24 UCA4354 SYR → IAD Jul 24, 17:30 UTCJul 24, 18:40 UTC1h 10m
2026-07-24 UCA4354 SYR → IAD Jul 24, 17:27 UTCJul 24, 18:37 UTC1h 10m
2026-07-24 UCA4331 IAD → CMH Jul 24, 15:00 UTCJul 24, 15:35 UTC35m
2026-07-24 UCA4331 IAD → CMH Jul 24, 14:45 UTCJul 24, 15:35 UTC50m
2026-07-23 UCA4266 MFE → IAH Jul 23, 22:45 UTCJul 23, 23:15 UTC30m
2026-07-23 UCA4277 DEN → XNA Jul 23, 18:25 UTCJul 23, 20:20 UTC1h 55m
2026-07-23 UCA4276 IAH → PBC Jul 23, 15:35 UTCJul 23, 17:15 UTC1h 40m
2026-07-23 UCA4276 IAH → PBC Jul 23, 15:36 UTCJul 23, 17:17 UTC1h 41m
2026-07-23 UCA4844 PWM → IAD Jul 23, 12:10 UTCJul 23, 13:15 UTC1h 5m
2026-07-22 UCA4323 DEN → DRO Jul 22, 22:00 UTCJul 22, 23:05 UTC1h 5m
2026-07-22 UCA4289 ORF → IAD Jul 22, 19:25 UTCJul 22, 20:10 UTC45m
2026-07-22 UCA4289 ORF → IAD Jul 22, 19:20 UTCJul 22, 20:26 UTC1h 6m
2026-07-22 UCA4896 IAH → JAN Jul 22, 17:15 UTCJul 22, 18:05 UTC50m
2026-07-22 UCA4896 IAH → JAN Jul 22, 17:24 UTCJul 22, 18:16 UTC52m
2026-07-22 UCA4224 AMA → IAH Jul 22, 14:10 UTCJul 22, 15:25 UTC1h 15m
2026-07-22 UCA4839 IAH → AMA Jul 22, 01:45 UTCJul 22, 02:50 UTC1h 5m
2026-07-21 UCA4923 MOB → IAH Jul 21, 22:15 UTCJul 21, 23:20 UTC1h 5m
2026-07-21 UCA4307 BTV → IAD Jul 21, 19:55 UTCJul 21, 21:05 UTC1h 10m
2026-07-21 UCA4338 IAD → CMH Jul 21, 17:00 UTCJul 21, 18:25 UTC1h 25m
2026-07-21 UCA4297 IAD → PVD Jul 21, 14:50 UTCJul 21, 16:00 UTC1h 10m
2026-07-21 UCA4301 ICT → IAH Jul 21, 12:20 UTCJul 21, 13:20 UTC1h 0m
2026-07-21 UCA4296 - Jul 21, 01:20 UTCJul 21, 02:10 UTC50m
2026-07-20 UCA4353 IAD → PVD Jul 20, 23:15 UTCJul 21, 00:05 UTC49m
2026-07-20 UCA4278 IAD → CHS Jul 20, 21:45 UTCJul 20, 22:30 UTC45m
2026-07-20 UCA4980 BTR → IAH Jul 20, 19:40 UTCJul 20, 20:35 UTC55m
2026-07-20 UCA4287 IAH → HRL Jul 20, 17:25 UTCJul 20, 18:10 UTC45m
2026-07-20 UCA4357 LRD → IAH Jul 20, 14:45 UTCJul 20, 15:42 UTC57m
2026-07-20 UCA4357 - Jul 20, 14:40 UTCJul 20, 15:40 UTC1h 0m
2026-07-20 UCA4892 - Jul 20, 03:05 UTCJul 20, 04:05 UTC1h 0m
2026-07-20 UCA4892 IAH → LRD Jul 20, 03:03 UTCJul 20, 03:59 UTC56m
2026-07-20 UCA4228 - Jul 20, 00:20 UTCJul 20, 01:40 UTC1h 20m
2026-07-20 UCA4228 - Jul 20, 00:24 UTCJul 20, 01:42 UTC1h 18m
2026-07-19 UCA4256 IAH → BHM Jul 19, 22:15 UTCJul 19, 23:35 UTC1h 20m
2026-07-19 UCA4256 IAH → BHM Jul 19, 22:09 UTCJul 19, 23:37 UTC1h 28m
2026-07-19 UCA4277 DEN → XNA Jul 19, 18:45 UTCJul 19, 20:45 UTC2h 0m
2026-07-19 UCA4276 IAH → PBC Jul 19, 15:40 UTCJul 19, 16:15 UTC35m
2026-07-19 UCA4276 IAH → PBC Jul 19, 15:46 UTCJul 19, 17:21 UTC1h 35m

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 Jul 26, 21:00 UTC.
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 UCA4276, UCA4277, UCA4341, UCA4247, UCA4331.