Apparatus

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sensors Mode-S transponder

A0A923

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N14125 · EMBRAER ERJ-145XR · operated by UNITED AIRLINES INC

Hex
A0A923
Octal
50124443
Decimal
10,529,059
Country
US
Tail
N14125
Type
E45X
No current signal · last broadcast 13d ago
Flights observed
58
Distinct callsigns
20
Country
US
Last broadcast
13d ago

Last known position

Most recent position reported by Mode-S A0A923.

Country allocation

The ICAO 24-bit address A0A923 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
UCA4845 CommutAir 3 2026-04-20
UCA4842 - 3 2026-04-13
UCA4989 CommutAir 2 2026-04-18
UCA4985 CommutAir 2 2026-04-19
UCA4943 CommutAir 2 2026-04-20
UCA4937 CommutAir 2 2026-04-21
UCA4860 CommutAir 2 2026-04-17
UCA4843 - 2 2026-04-17
UCA4838 CommutAir 2 2026-04-14
UCA4811 CommutAir 2 2026-04-20
UCA4365 CommutAir 2 2026-04-15
UCA4355 CommutAir 2 2026-04-19
UCA4343 CommutAir 2 2026-04-16
UCA4314 CommutAir 2 2026-04-16
UCA4301 CommutAir 2 2026-04-22
UCA4295 CommutAir 2 2026-04-17
UCA3280 CommutAir 2 2026-05-16
UCA4980 CommutAir 1 2026-04-22
UCA4940 CommutAir 1 2026-04-17
UCA4929 CommutAir 1 2026-04-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-16 UCA3280 IAD → YQB May 16, 17:30 UTCMay 16, 19:40 UTC2h 10m
2026-05-16 UCA3280 IAD → YQB May 16, 13:31 UTCMay 16, 16:35 UTC3h 5m
2026-04-22 UCA3263 YQB → IAD Apr 22, 19:25 UTCApr 22, 22:55 UTC3h 30m
2026-04-22 UCA4980 BTR → IAH Apr 22, 17:15 UTCApr 22, 18:05 UTC50m
2026-04-22 UCA4338 IAD → CMH Apr 22, 15:25 UTCApr 22, 16:05 UTC40m
2026-04-22 UCA4301 ICT → IAH Apr 22, 12:55 UTCApr 22, 13:35 UTC40m
2026-04-22 UCA4301 ICT → IAH Apr 22, 12:42 UTCApr 22, 13:42 UTC1h 0m
2026-04-21 UCA4371 IAD → BDL Apr 21, 22:10 UTCApr 21, 22:35 UTC25m
2026-04-21 UCA4361 PWM → IAD Apr 21, 19:30 UTCApr 21, 20:10 UTC40m
2026-04-21 UCA4927 IAH → CRP Apr 21, 17:20 UTCApr 21, 18:05 UTC45m
2026-04-21 UCA4937 - Apr 21, 14:31 UTCApr 21, 16:01 UTC1h 30m
2026-04-21 UCA4937 - Apr 21, 14:40 UTCApr 21, 16:05 UTC1h 25m
2026-04-20 UCA4811 PVD → IAD Apr 20, 21:50 UTCApr 20, 23:00 UTC1h 10m
2026-04-20 UCA4811 PVD → IAD Apr 20, 21:54 UTCApr 20, 22:53 UTC59m
2026-04-20 UCA4845 LIT → IAH Apr 20, 19:15 UTCApr 20, 19:50 UTC35m
2026-04-20 UCA4845 LIT → IAH Apr 20, 19:20 UTCApr 20, 19:54 UTC34m
2026-04-20 UCA4943 IAD → AVP Apr 20, 17:35 UTCApr 20, 18:00 UTC25m
2026-04-20 UCA4896 IAH → JAN Apr 20, 14:30 UTCApr 20, 15:15 UTC45m
2026-04-19 UCA4858 IAD → DAY Apr 19, 23:35 UTCApr 20, 00:20 UTC45m
2026-04-19 UCA4816 AMA → IAH Apr 19, 20:40 UTCApr 19, 21:40 UTC1h 0m
2026-04-19 UCA4355 IAD → PVD Apr 19, 17:25 UTCApr 19, 18:10 UTC45m
2026-04-19 UCA4355 IAD → PVD Apr 19, 17:37 UTCApr 19, 18:26 UTC49m
2026-04-19 UCA4819 LRD → IAH Apr 19, 14:50 UTCApr 19, 15:10 UTC20m
2026-04-19 UCA4985 IAH → LCH Apr 19, 01:55 UTCApr 19, 02:10 UTC15m
2026-04-19 UCA4985 IAH → LCH Apr 19, 01:53 UTCApr 19, 02:27 UTC34m
2026-04-18 UCA4246 GPT → IAH Apr 18, 23:10 UTCApr 19, 00:35 UTC1h 25m
2026-04-18 UCA4272 - Apr 18, 18:20 UTCApr 18, 19:10 UTC50m
2026-04-18 UCA4989 MOB → IAH Apr 18, 14:15 UTCApr 18, 15:30 UTC1h 15m
2026-04-18 UCA4989 MOB → IAH Apr 18, 14:12 UTCApr 18, 15:26 UTC1h 14m
2026-04-17 UCA4295 IAD → MOB Apr 17, 23:25 UTCApr 18, 01:00 UTC1h 35m
2026-04-17 UCA4295 IAD → MOB Apr 17, 23:05 UTCApr 17, 23:20 UTC15m
2026-04-17 UCA4860 ROC → IAD Apr 17, 19:25 UTCApr 17, 19:50 UTC25m
2026-04-17 UCA4860 ROC → IAD Apr 17, 19:04 UTCApr 17, 19:49 UTC45m
2026-04-17 UCA4843 - Apr 17, 17:25 UTCApr 17, 18:00 UTC35m
2026-04-17 UCA4843 - Apr 17, 17:10 UTCApr 17, 17:15 UTC5m
2026-04-17 UCA4834 - Apr 17, 14:50 UTCApr 17, 15:15 UTC24m
2026-04-17 UCA4319 IAD → SCE Apr 17, 13:01 UTCApr 17, 13:53 UTC52m
2026-04-17 UCA4940 IAD → ALB Apr 17, 00:35 UTCApr 17, 01:00 UTC25m
2026-04-16 UCA4840 IAD → CHO Apr 16, 23:00 UTCApr 16, 23:10 UTC10m
2026-04-16 UCA4314 PWM → IAD Apr 16, 19:15 UTCApr 16, 19:50 UTC35m
2026-04-16 UCA4314 PWM → IAD Apr 16, 18:00 UTCApr 16, 19:10 UTC1h 10m
2026-04-16 UCA4369 IAH → MOB Apr 16, 15:37 UTCApr 16, 16:28 UTC51m
2026-04-16 UCA4852 SGF → IAH Apr 16, 11:25 UTCApr 16, 13:00 UTC1h 35m
2026-04-16 UCA4343 IAD → PHL Apr 16, 03:09 UTCApr 16, 03:24 UTC15m
2026-04-16 UCA4343 IAD → PHL Apr 16, 01:25 UTCApr 16, 03:04 UTC1h 40m
2026-04-15 UCA4365 IAD → BDL Apr 15, 23:10 UTCApr 15, 23:30 UTC20m
2026-04-15 UCA4365 IAD → BDL Apr 15, 22:38 UTCApr 15, 23:26 UTC48m
2026-04-15 UCA4929 LBB → IAH Apr 15, 20:15 UTCApr 15, 21:00 UTC45m
2026-04-15 UCA4297 IAD → PVD Apr 15, 17:28 UTCApr 15, 18:13 UTC45m
2026-04-14 UCA4838 IAH → ELP Apr 14, 14:50 UTCApr 14, 15:19 UTC29m

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 N14125 page for operator, model, and routing details .

Mode-S A0A923 frequently asked

What is Mode-S code A0A923?
A0A923 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N14125.
Where is Mode-S A0A923 registered?
Mode-S code A0A923 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 A0A923 broadcasting right now?
No active broadcast right now. Last signal was 13d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0A923, octal 50124443, decimal 10,529,059.
What flights does A0A923 operate?
Mode-S A0A923 has broadcast 20 distinct callsigns, including UCA4845, UCA4842, UCA4989, UCA4985, UCA4943.