Apparatus

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sensors Mode-S transponder

A0A9D1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N14174 · EMBRAER ERJ-145XR · operated by UNITED AIRLINES INC

Hex
A0A9D1
Octal
50124721
Decimal
10,529,233
Country
US
Tail
N14174
Type
E45X
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
703
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A0A9D1.

Country allocation

The ICAO 24-bit address A0A9D1 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
UCA4307 CommutAir 10 2026-07-18
UCA4257 - 10 2026-07-25
UCA4241 - 10 2026-07-20
UCA4965 CommutAir 8 2026-07-23
UCA4824 - 8 2026-07-20
UCA4274 CommutAir 8 2026-07-22
UCA4950 CommutAir 7 2026-07-24
UCA4942 CommutAir 7 2026-07-23
UCA4939 CommutAir 7 2026-07-24
UCA4856 - 7 2026-07-10
UCA4848 CommutAir 7 2026-07-25
UCA4354 - 7 2026-06-23
UCA4313 CommutAir 7 2026-07-23
UCA4270 - 7 2026-07-03
UCA4251 - 7 2026-06-28
UCA4227 - 7 2026-07-23
UCA4923 - 6 2026-07-18
UCA4857 - 6 2026-07-03
UCA4836 - 6 2026-06-24
UCA4810 - 6 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UCA4250 IAD → MDT Jul 26, 22:00 UTCJul 26, 22:15 UTC15m
2026-07-26 UCA4362 ORF → IAD Jul 26, 19:05 UTCJul 26, 20:00 UTC55m
2026-07-26 UCA4360 IAD → SYR Jul 26, 17:10 UTCJul 26, 17:50 UTC40m
2026-07-26 UCA4840 IAD → CHO Jul 26, 14:35 UTCJul 26, 15:30 UTC55m
2026-07-26 UCA4370 BTV → IAD Jul 26, 12:40 UTCJul 26, 13:20 UTC40m
2026-07-25 UCA4238 IAD → BTV Jul 25, 23:50 UTCJul 26, 01:05 UTC1h 15m
2026-07-25 UCA4302 DEN → XNA Jul 25, 21:45 UTCJul 25, 22:50 UTC1h 5m
2026-07-25 UCA4848 TYS → IAD Jul 25, 18:00 UTCJul 25, 19:10 UTC1h 10m
2026-07-25 UCA4848 TYS → IAD Jul 25, 17:53 UTCJul 25, 19:16 UTC1h 23m
2026-07-25 UCA4257 - Jul 25, 13:50 UTCJul 25, 14:50 UTC1h 0m
2026-07-25 UCA4853 SYR → IAD Jul 25, 00:25 UTCJul 25, 01:25 UTC1h 0m
2026-07-24 UCA4977 IAD → PVD Jul 24, 22:25 UTCJul 24, 23:10 UTC45m
2026-07-24 UCA4848 TYS → IAD Jul 24, 17:55 UTCJul 24, 19:20 UTC1h 25m
2026-07-24 UCA4257 - Jul 24, 13:30 UTCJul 24, 14:30 UTC1h 0m
2026-07-24 UCA4939 ITH → IAD Jul 24, 10:16 UTCJul 24, 11:25 UTC1h 9m
2026-07-24 UCA4950 IAD → ITH Jul 24, 03:00 UTCJul 24, 03:35 UTC35m
2026-07-23 UCA4313 PWM → IAD Jul 23, 23:55 UTCJul 24, 01:00 UTC1h 5m
2026-07-23 UCA4313 PWM → IAD Jul 23, 23:53 UTCJul 24, 01:12 UTC1h 19m
2026-07-23 UCA4963 IAD → GSP Jul 23, 21:45 UTCJul 23, 22:55 UTC1h 10m
2026-07-23 UCA4942 ALB → IAD Jul 23, 19:20 UTCJul 23, 20:30 UTC1h 10m
2026-07-23 UCA4317 IAD → ALB Jul 23, 17:10 UTCJul 23, 18:05 UTC55m
2026-07-23 UCA4227 - Jul 23, 14:55 UTCJul 23, 15:40 UTC45m
2026-07-23 UCA4965 IAD → AVP Jul 23, 12:50 UTCJul 23, 13:30 UTC40m
2026-07-23 UCA4342 CHO → IAD Jul 23, 10:40 UTCJul 23, 11:00 UTC20m
2026-07-23 UCA4265 CVG → IAD Jul 23, 03:10 UTCJul 23, 03:25 UTC15m
2026-07-23 UCA4267 IAD → PVD Jul 23, 01:00 UTCJul 23, 01:55 UTC55m
2026-07-22 UCA4274 IAD → PVD Jul 22, 23:00 UTCJul 23, 00:20 UTC1h 20m
2026-07-22 UCA4230 AVP → IAD Jul 22, 19:30 UTCJul 22, 20:10 UTC40m
2026-07-22 UCA4234 COD → DEN Jul 22, 18:00 UTCJul 22, 18:30 UTC30m
2026-07-22 UCA4227 - Jul 22, 14:55 UTCJul 22, 15:35 UTC40m
2026-07-22 UCA4965 IAD → AVP Jul 22, 13:20 UTCJul 22, 13:50 UTC30m
2026-07-22 UCA4922 ROA → IAD Jul 22, 10:31 UTCJul 22, 11:06 UTC35m
2026-07-22 UCA3266 IAD → YQB Jul 22, 00:30 UTCJul 22, 01:20 UTC50m
2026-07-21 UCA4257 IAD → TYS Jul 21, 13:17 UTCJul 21, 14:39 UTC1h 22m
2026-07-21 UCA4257 - Jul 21, 13:15 UTCJul 21, 14:20 UTC1h 5m
2026-07-21 UCA4939 - Jul 21, 10:05 UTCJul 21, 10:50 UTC45m
2026-07-21 UCA4950 - Jul 21, 03:10 UTCJul 21, 03:50 UTC40m
2026-07-20 UCA4267 IAD → PVD Jul 20, 23:50 UTCJul 21, 01:00 UTC1h 10m
2026-07-20 UCA4274 IAD → PVD Jul 20, 21:45 UTCJul 20, 22:45 UTC1h 0m
2026-07-20 UCA4274 IAD → PVD Jul 20, 21:38 UTCJul 20, 22:43 UTC1h 5m
2026-07-20 UCA4824 - Jul 20, 19:10 UTCJul 20, 20:15 UTC1h 5m
2026-07-20 UCA4241 IAD → DAY Jul 20, 17:04 UTCJul 20, 18:11 UTC1h 7m
2026-07-20 UCA4241 IAD → DAY Jul 20, 17:15 UTCJul 20, 18:10 UTC55m
2026-07-20 UCA4325 - Jul 20, 14:20 UTCJul 20, 15:30 UTC1h 10m
2026-07-19 UCA4914 IAD → TYS Jul 19, 23:40 UTCJul 20, 00:45 UTC1h 5m
2026-07-19 UCA4914 IAD → TYS Jul 19, 23:23 UTCJul 20, 00:48 UTC1h 25m
2026-07-19 UCA4314 - Jul 19, 18:05 UTCJul 19, 21:10 UTC3h 5m
2026-07-19 UCA4314 MOB → IAD Jul 19, 18:02 UTCJul 19, 21:09 UTC3h 7m
2026-07-19 UCA4369 - Jul 19, 15:30 UTCJul 19, 16:30 UTC1h 0m
2026-07-19 UCA4330 LCH → IAH Jul 19, 12:45 UTCJul 19, 13:15 UTC30m

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 N14174 page for operator, model, and routing details .

Mode-S A0A9D1 frequently asked

What is Mode-S code A0A9D1?
A0A9D1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N14174.
Where is Mode-S A0A9D1 registered?
Mode-S code A0A9D1 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 A0A9D1 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0A9D1, octal 50124721, decimal 10,529,233.
What flights does A0A9D1 operate?
Mode-S A0A9D1 has broadcast 20 distinct callsigns, including UCA4307, UCA4257, UCA4241, UCA4965, UCA4824.