Apparatus

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sensors Mode-S transponder

A05AD4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N12175 · EMBRAER ERJ-145XR · operated by UNITED AIRLINES INC

Hex
A05AD4
Octal
50055324
Decimal
10,509,012
Country
US
Tail
N12175
Type
E45X
No current signal · last broadcast Jul 26, 22:10 UTC
Flights observed
564
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:10 UTC

Last known position

Most recent position reported by Mode-S A05AD4.

Country allocation

The ICAO 24-bit address A05AD4 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
UCA4237 - 10 2026-07-07
UCA4234 CommutAir 8 2026-05-28
UCA4274 - 7 2026-07-13
UCA4902 CommutAir 6 2026-06-21
UCA4842 - 6 2026-06-22
UCA4833 - 6 2026-07-12
UCA4819 - 6 2026-06-24
UCA4818 - 6 2026-07-13
UCA4815 - 6 2026-06-30
UCA4377 - 6 2026-07-01
UCA4350 CommutAir 6 2026-07-18
UCA4267 - 6 2026-07-13
UCA4989 CommutAir 5 2026-07-26
UCA4959 - 5 2026-07-14
UCA4834 - 5 2026-07-14
UCA4812 - 5 2026-06-23
UCA4359 - 5 2026-06-25
UCA4334 - 5 2026-07-02
UCA4328 - 5 2026-06-30
UCA4319 - 5 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UCA4278 IAD → CHS Jul 26, 21:30 UTCJul 26, 22:10 UTC40m
2026-07-26 UCA4934 LCH → IAH Jul 26, 19:25 UTCJul 26, 19:40 UTC15m
2026-07-26 UCA4934 LCH → IAH Jul 26, 19:27 UTCJul 26, 19:41 UTC14m
2026-07-26 UCA4921 IAH → CRP Jul 26, 17:40 UTCJul 26, 17:55 UTC15m
2026-07-26 UCA4989 MOB → IAH Jul 26, 14:20 UTCJul 26, 15:30 UTC1h 10m
2026-07-26 UCA4989 MOB → IAH Jul 26, 14:12 UTCJul 26, 15:25 UTC1h 13m
2026-07-25 UCA4295 IAD → MOB Jul 25, 23:05 UTCJul 26, 00:55 UTC1h 50m
2026-07-25 UCA3262 IAD → PWM Jul 25, 16:30 UTCJul 25, 17:35 UTC1h 5m
2026-07-25 UCA3262 IAD → PWM Jul 25, 15:59 UTCJul 25, 17:43 UTC1h 44m
2026-07-23 UCA4914 IAD → TYS Jul 23, 23:05 UTCJul 24, 00:10 UTC1h 5m
2026-07-23 UCA4914 IAD → TYS Jul 23, 23:09 UTCJul 24, 00:12 UTC1h 3m
2026-07-23 UCA4824 IAD → HSV Jul 23, 19:10 UTCJul 23, 20:10 UTC1h 0m
2026-07-23 UCA4241 BTV → IAD Jul 23, 17:00 UTCJul 23, 18:05 UTC1h 5m
2026-07-23 UCA4840 IAD → CHO Jul 23, 14:35 UTCJul 23, 15:30 UTC55m
2026-07-23 UCA4370 BTV → IAD Jul 23, 12:45 UTCJul 23, 13:30 UTC45m
2026-07-23 UCA4270 MFE → IAH Jul 23, 00:20 UTCJul 23, 01:15 UTC55m
2026-07-22 UCA4823 - Jul 22, 21:50 UTCJul 22, 22:35 UTC45m
2026-07-22 UCA4942 ALB → IAD Jul 22, 19:05 UTCJul 22, 20:15 UTC1h 10m
2026-07-22 UCA4317 IAD → ALB Jul 22, 17:00 UTCJul 22, 17:55 UTC55m
2026-07-22 UCA4314 - Jul 22, 13:05 UTCJul 22, 14:55 UTC1h 50m
2026-07-22 UCA4314 MOB → IAD Jul 22, 13:08 UTCJul 22, 14:58 UTC1h 50m
2026-07-21 UCA4369 - Jul 21, 15:35 UTCJul 21, 16:45 UTC1h 10m
2026-07-21 UCA4346 IAD → YOW Jul 21, 12:40 UTCJul 21, 13:40 UTC1h 0m
2026-07-21 UCA4309 IAD → CVG Jul 21, 01:45 UTCJul 21, 02:35 UTC50m
2026-07-21 UCA4309 IAD → CVG Jul 21, 01:48 UTCJul 21, 02:36 UTC48m
2026-07-20 UCA4923 - Jul 20, 22:15 UTCJul 20, 23:00 UTC45m
2026-07-20 UCA4923 MOB → IAH Jul 20, 22:27 UTCJul 20, 23:12 UTC45m
2026-07-20 UCA4307 BTV → IAD Jul 20, 20:05 UTCJul 20, 21:00 UTC55m
2026-07-20 UCA4307 BTV → IAD Jul 20, 20:04 UTCJul 20, 21:30 UTC1h 26m
2026-07-20 UCA4300 LBB → IAH Jul 20, 17:00 UTCJul 20, 18:10 UTC1h 10m
2026-07-20 UCA4261 IAH → LBB Jul 20, 15:00 UTCJul 20, 16:05 UTC1h 5m
2026-07-20 UCA4844 PWM → IAD Jul 20, 12:15 UTCJul 20, 13:20 UTC1h 5m
2026-07-20 UCA4844 PWM → IAD Jul 20, 12:19 UTCJul 20, 13:19 UTC1h 0m
2026-07-19 UCA4323 DEN → DRO Jul 19, 22:45 UTCJul 19, 23:45 UTC1h 0m
2026-07-19 UCA4835 MFE → IAH Jul 19, 19:20 UTCJul 19, 20:15 UTC55m
2026-07-19 UCA4298 PVD → IAD Jul 19, 17:35 UTCJul 19, 18:20 UTC45m
2026-07-19 UCA4298 PVD → IAD Jul 19, 17:43 UTCJul 19, 18:22 UTC39m
2026-07-19 UCA4989 MOB → IAH Jul 19, 14:15 UTCJul 19, 15:20 UTC1h 5m
2026-07-18 UCA4323 DEN → DRO Jul 18, 22:05 UTCJul 18, 23:15 UTC1h 10m
2026-07-18 UCA4350 PWM → IAD Jul 18, 19:45 UTCJul 18, 20:50 UTC1h 5m
2026-07-18 UCA4239 - Jul 18, 17:15 UTCJul 18, 18:15 UTC1h 0m
2026-07-18 UCA4239 IAH → MAF Jul 18, 17:13 UTCJul 18, 18:15 UTC1h 2m
2026-07-18 UCA4331 - Jul 18, 14:55 UTCJul 18, 15:30 UTC35m
2026-07-17 UCA4266 - Jul 17, 22:45 UTCJul 17, 23:14 UTC30m
2026-07-17 UCA4838 - Jul 17, 19:45 UTCJul 17, 20:55 UTC1h 10m
2026-07-17 UCA4301 - Jul 17, 17:40 UTCJul 17, 18:40 UTC1h 0m
2026-07-17 UCA4224 AMA → IAH Jul 17, 14:15 UTCJul 17, 15:25 UTC1h 10m
2026-07-17 UCA4224 AMA → IAH Jul 17, 14:20 UTCJul 17, 15:21 UTC1h 1m
2026-07-17 UCA4839 - Jul 17, 01:49 UTCJul 17, 02:54 UTC1h 5m
2026-07-16 UCA4348 - Jul 16, 22:59 UTCJul 16, 23:55 UTC55m

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 N12175 page for operator, model, and routing details .

Mode-S A05AD4 frequently asked

What is Mode-S code A05AD4?
A05AD4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N12175.
Where is Mode-S A05AD4 registered?
Mode-S code A05AD4 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 A05AD4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A05AD4, octal 50055324, decimal 10,509,012.
What flights does A05AD4 operate?
Mode-S A05AD4 has broadcast 20 distinct callsigns, including UCA4237, UCA4234, UCA4274, UCA4902, UCA4842.