Apparatus

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sensors Mode-S transponder

A081A3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N13124 · EMBRAER ERJ-145XR · operated by UNITED AIRLINES INC

Hex
A081A3
Octal
50100643
Decimal
10,518,947
Country
US
Tail
N13124
Type
E45X
No current signal · last broadcast 25d ago
Flights observed
374
Distinct callsigns
20
Country
US
Last broadcast
25d ago

Last known position

Most recent position reported by Mode-S A081A3.

Country allocation

The ICAO 24-bit address A081A3 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
UCA4300 CommutAir 6 2026-06-02
UCA4929 CommutAir 5 2026-06-02
UCA4893 CommutAir 5 2026-05-21
UCA4844 CommutAir 5 2026-05-27
UCA4822 CommutAir 5 2026-06-01
UCA4378 CommutAir 5 2026-05-29
UCA4323 CommutAir 5 2026-06-06
UCA4285 CommutAir 5 2026-06-05
UCA4273 CommutAir 5 2026-06-05
UCA4226 CommutAir 5 2026-06-08
UCA4989 CommutAir 4 2026-06-07
UCA4985 - 4 2026-06-19
UCA4917 CommutAir 4 2026-06-02
UCA4372 CommutAir 4 2026-05-04
UCA4365 CommutAir 4 2026-06-02
UCA4346 CommutAir 4 2026-05-30
UCA4320 CommutAir 4 2026-06-09
UCA4314 CommutAir 4 2026-05-14
UCA4301 CommutAir 4 2026-04-17
UCA4268 CommutAir 4 2026-05-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-19 UCA3264 - Jun 19, 19:45 UTCJun 19, 21:09 UTC1h 25m
2026-06-19 UCA4330 - Jun 19, 12:34 UTCJun 19, 12:59 UTC25m
2026-06-19 UCA4330 LCH → IAH Jun 19, 12:40 UTCJun 19, 13:02 UTC22m
2026-06-19 UCA4985 - Jun 19, 01:50 UTCJun 19, 02:09 UTC20m
2026-06-19 UCA4985 IAH → LCH Jun 19, 01:53 UTCJun 19, 02:18 UTC25m
2026-06-09 UCA4237 IAH → MFE Jun 9, 17:40 UTCJun 9, 18:25 UTC45m
2026-06-09 UCA4350 PWM → IAD Jun 9, 15:27 UTCJun 9, 16:24 UTC57m
2026-06-09 UCA4318 JAN → IAH Jun 9, 12:30 UTCJun 9, 13:15 UTC45m
2026-06-09 UCA4320 IAH → JAN Jun 9, 01:35 UTCJun 9, 02:20 UTC45m
2026-06-09 UCA4320 IAH → JAN Jun 9, 01:42 UTCJun 9, 02:30 UTC48m
2026-06-08 UCA4996 SGF → IAH Jun 8, 22:00 UTCJun 8, 23:25 UTC1h 25m
2026-06-08 UCA4911 GPT → IAH Jun 8, 19:35 UTCJun 8, 20:50 UTC1h 15m
2026-06-08 UCA4245 JAN → IAH Jun 8, 17:20 UTCJun 8, 18:10 UTC50m
2026-06-08 UCA4245 JAN → IAH Jun 8, 17:20 UTCJun 8, 18:06 UTC46m
2026-06-08 UCA4347 IAH → JAN Jun 8, 15:20 UTCJun 8, 16:00 UTC40m
2026-06-08 UCA4226 LRD → IAH Jun 8, 12:40 UTCJun 8, 13:40 UTC1h 0m
2026-06-08 UCA4892 IAH → LRD Jun 8, 03:05 UTCJun 8, 03:55 UTC50m
2026-06-08 UCA4228 - Jun 8, 00:05 UTCJun 8, 01:30 UTC1h 25m
2026-06-07 UCA4256 IAH → BHM Jun 7, 21:35 UTCJun 7, 22:55 UTC1h 20m
2026-06-07 UCA4934 LCH → IAH Jun 7, 19:30 UTCJun 7, 19:45 UTC15m
2026-06-07 UCA4921 IAH → CRP Jun 7, 17:45 UTCJun 7, 18:00 UTC15m
2026-06-07 UCA4989 MOB → IAH Jun 7, 14:05 UTCJun 7, 15:15 UTC1h 10m
2026-06-06 UCA4323 DEN → DRO Jun 6, 22:15 UTCJun 6, 23:15 UTC1h 0m
2026-06-06 UCA4859 LBB → IAH Jun 6, 19:40 UTCJun 6, 20:49 UTC1h 10m
2026-06-06 UCA4354 SYR → IAD Jun 6, 17:29 UTCJun 6, 18:45 UTC1h 15m
2026-06-06 UCA4354 SYR → IAD Jun 6, 17:34 UTCJun 6, 18:47 UTC1h 13m
2026-06-06 UCA4376 IAD → BTV Jun 6, 14:54 UTCJun 6, 15:44 UTC50m
2026-06-06 UCA4355 IAD → PVD Jun 6, 12:45 UTCJun 6, 13:34 UTC50m
2026-06-05 UCA4246 GPT → IAH Jun 5, 22:35 UTCJun 5, 23:45 UTC1h 10m
2026-06-05 UCA4273 IAH → GPT Jun 5, 20:05 UTCJun 5, 21:00 UTC55m
2026-06-05 UCA4928 CRP → IAH Jun 5, 17:20 UTCJun 5, 18:10 UTC50m
2026-06-05 UCA4928 CRP → IAH Jun 5, 17:22 UTCJun 5, 18:08 UTC46m
2026-06-05 UCA4894 IAH → CRP Jun 5, 15:35 UTCJun 5, 16:15 UTC40m
2026-06-05 UCA4226 LRD → IAH Jun 5, 12:45 UTCJun 5, 13:30 UTC45m
2026-06-05 UCA4285 IAH → MFE Jun 5, 00:15 UTCJun 5, 01:10 UTC55m
2026-06-04 UCA4816 AMA → IAH Jun 4, 20:55 UTCJun 4, 22:25 UTC1h 30m
2026-06-04 UCA4816 AMA → IAH Jun 4, 20:59 UTCJun 4, 22:08 UTC1h 9m
2026-06-04 UCA4817 IAH → AMA Jun 4, 18:35 UTCJun 4, 19:45 UTC1h 10m
2026-06-04 UCA4989 MOB → IAH Jun 4, 14:20 UTCJun 4, 15:45 UTC1h 25m
2026-06-04 UCA4989 MOB → IAH Jun 4, 14:27 UTCJun 4, 15:39 UTC1h 12m
2026-06-04 UCA4323 DEN → DRO Jun 4, 01:40 UTCJun 4, 02:35 UTC55m
2026-06-03 UCA4243 ORF → IAD Jun 3, 22:40 UTCJun 3, 23:50 UTC1h 10m
2026-06-03 UCA4243 ORF → IAD Jun 3, 22:55 UTCJun 3, 23:48 UTC53m
2026-06-03 UCA4272 IAH → GPT Jun 3, 17:15 UTCJun 3, 18:05 UTC50m
2026-06-03 UCA4272 IAH → GPT Jun 3, 17:13 UTCJun 3, 18:07 UTC54m
2026-06-03 UCA4357 LRD → IAH Jun 3, 14:45 UTCJun 3, 15:52 UTC1h 7m
2026-06-03 UCA4357 LRD → IAH Jun 3, 15:05 UTCJun 3, 15:55 UTC50m
2026-06-03 UCA4285 IAH → MFE Jun 3, 01:25 UTCJun 3, 02:15 UTC50m
2026-06-03 UCA4285 IAH → MFE Jun 3, 01:02 UTCJun 3, 02:14 UTC1h 12m
2026-06-02 UCA4365 IAD → BDL Jun 2, 22:45 UTCJun 2, 23:50 UTC1h 5m

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 N13124 page for operator, model, and routing details .

Mode-S A081A3 frequently asked

What is Mode-S code A081A3?
A081A3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N13124.
Where is Mode-S A081A3 registered?
Mode-S code A081A3 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 A081A3 broadcasting right now?
No active broadcast right now. Last signal was 25d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A081A3, octal 50100643, decimal 10,518,947.
What flights does A081A3 operate?
Mode-S A081A3 has broadcast 20 distinct callsigns, including UCA4300, UCA4929, UCA4893, UCA4844, UCA4822.