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 6h ago
Flights observed
617
Distinct callsigns
20
Country
US
Last broadcast
6h ago

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 - 9 2026-07-13
UCA4241 CommutAir 8 2026-06-25
UCA4856 - 7 2026-07-10
UCA4824 - 7 2026-06-25
UCA4354 - 7 2026-06-23
UCA4270 - 7 2026-07-03
UCA4251 - 7 2026-06-28
UCA4965 - 6 2026-06-29
UCA4942 - 6 2026-06-27
UCA4857 - 6 2026-07-03
UCA4836 - 6 2026-06-24
UCA4810 - 6 2026-07-09
UCA4257 - 6 2026-07-02
UCA4254 CommutAir 6 2026-06-12
UCA4974 - 5 2026-07-10
UCA4959 - 5 2026-07-01
UCA4950 - 5 2026-07-02
UCA4939 - 5 2026-07-02
UCA4925 - 5 2026-06-28
UCA4923 - 5 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UCA4923 - Jul 14, 00:30 UTCJul 14, 01:35 UTC1h 5m
2026-07-14 UCA4923 MOB → IAH Jul 14, 00:38 UTCJul 14, 01:38 UTC1h 0m
2026-07-13 UCA4307 - Jul 13, 22:45 UTCJul 13, 23:45 UTC1h 0m
2026-07-13 UCA4307 IAH → MOB Jul 13, 22:34 UTCJul 13, 23:43 UTC1h 9m
2026-07-13 UCA4300 - Jul 13, 19:50 UTCJul 13, 21:30 UTC1h 40m
2026-07-13 UCA4261 - Jul 13, 14:55 UTCJul 13, 16:00 UTC1h 5m
2026-07-13 UCA4301 - Jul 13, 12:35 UTCJul 13, 13:40 UTC1h 5m
2026-07-13 UCA4301 LIT → IAH Jul 13, 12:21 UTCJul 13, 13:41 UTC1h 20m
2026-07-13 UCA4296 - Jul 13, 01:45 UTCJul 13, 02:30 UTC45m
2026-07-13 UCA4296 IAH → LIT Jul 13, 01:28 UTCJul 13, 02:41 UTC1h 13m
2026-07-12 UCA4289 - Jul 12, 20:20 UTCJul 12, 21:20 UTC1h 0m
2026-07-12 UCA4896 - Jul 12, 18:01 UTCJul 12, 18:50 UTC50m
2026-07-12 UCA4896 IAH → JAN Jul 12, 17:39 UTCJul 12, 19:01 UTC1h 22m
2026-07-12 UCA4282 - Jul 12, 15:25 UTCJul 12, 16:15 UTC50m
2026-07-12 UCA4320 - Jul 12, 01:55 UTCJul 12, 02:35 UTC40m
2026-07-12 UCA4320 IAH → JAN Jul 12, 01:42 UTCJul 12, 02:47 UTC1h 5m
2026-07-11 UCA4303 - Jul 11, 22:50 UTCJul 12, 00:01 UTC1h 10m
2026-07-11 UCA4869 - Jul 11, 20:00 UTCJul 11, 21:15 UTC1h 15m
2026-07-11 UCA4245 - Jul 11, 17:35 UTCJul 11, 18:40 UTC1h 5m
2026-07-11 UCA4245 JAN → IAH Jul 11, 17:20 UTCJul 11, 18:38 UTC1h 18m
2026-07-11 UCA4347 - Jul 11, 15:35 UTCJul 11, 16:15 UTC40m
2026-07-11 UCA4347 IAH → JAN Jul 11, 15:17 UTCJul 11, 16:31 UTC1h 14m
2026-07-11 UCA4917 - Jul 11, 11:35 UTCJul 11, 12:55 UTC1h 20m
2026-07-10 UCA4855 IAH → ICT Jul 10, 23:35 UTCJul 11, 01:05 UTC1h 30m
2026-07-10 UCA4905 - Jul 10, 20:50 UTCJul 10, 22:20 UTC1h 30m
2026-07-10 UCA4905 HSV → IAH Jul 10, 20:26 UTCJul 10, 22:20 UTC1h 54m
2026-07-10 UCA4286 - Jul 10, 18:05 UTCJul 10, 19:35 UTC1h 30m
2026-07-10 UCA4974 - Jul 10, 14:40 UTCJul 10, 15:05 UTC25m
2026-07-10 UCA4974 MDT → IAD Jul 10, 14:42 UTCJul 10, 15:05 UTC23m
2026-07-10 UCA4986 - Jul 10, 13:10 UTCJul 10, 13:35 UTC25m
2026-07-10 UCA4860 - Jul 10, 10:10 UTCJul 10, 11:00 UTC50m
2026-07-10 UCA4856 - Jul 10, 03:25 UTCJul 10, 04:10 UTC45m
2026-07-10 UCA4861 - Jul 10, 00:10 UTCJul 10, 01:05 UTC55m
2026-07-09 UCA3265 - Jul 9, 21:20 UTCJul 9, 21:50 UTC30m
2026-07-09 UCA4253 - Jul 9, 17:20 UTCJul 9, 17:55 UTC35m
2026-07-09 UCA4810 - Jul 9, 00:15 UTCJul 9, 00:55 UTC40m
2026-07-08 UCA4308 IAD → ORF Jul 8, 22:15 UTCJul 8, 22:45 UTC30m
2026-07-08 UCA4327 - Jul 8, 19:20 UTCJul 8, 20:00 UTC40m
2026-07-08 UCA4327 GSO → IAD Jul 8, 19:18 UTCJul 8, 20:06 UTC48m
2026-07-08 UCA4349 - Jul 8, 17:25 UTCJul 8, 18:10 UTC45m
2026-07-08 UCA4283 - Jul 8, 14:35 UTCJul 8, 15:35 UTC1h 0m
2026-07-08 UCA4818 - Jul 8, 12:35 UTCJul 8, 13:35 UTC1h 0m
2026-07-08 UCA4818 IAD → CAE Jul 8, 12:36 UTCJul 8, 13:36 UTC1h 0m
2026-07-07 UCA4259 - Jul 7, 23:55 UTCJul 8, 01:10 UTC1h 15m
2026-07-07 UCA4364 - Jul 7, 22:05 UTCJul 7, 23:00 UTC55m
2026-07-07 UCA4314 PWM → IAD Jul 7, 17:55 UTCJul 7, 19:40 UTC1h 45m
2026-07-07 UCA4314 PWM → IAD Jul 7, 18:02 UTCJul 7, 19:42 UTC1h 40m
2026-07-07 UCA4369 - Jul 7, 15:45 UTCJul 7, 16:35 UTC50m
2026-07-07 UCA4255 - Jul 7, 11:35 UTCJul 7, 13:00 UTC1h 25m
2026-07-07 UCA4343 - Jul 7, 01:15 UTCJul 7, 02:35 UTC1h 20m

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 6h ago.
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, UCA4241, UCA4856, UCA4824, UCA4354.