Apparatus

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sensors Mode-S transponder

A0ACDD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N14228 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
A0ACDD
Octal
50126335
Decimal
10,530,013
Country
US
Tail
N14228
Type
B738
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
431
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S A0ACDD.

Country allocation

The ICAO 24-bit address A0ACDD 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
UAL1325 - 5 2026-07-05
UAL678 United Airlines 4 2026-06-09
UAL664 United Airlines 4 2026-06-02
UAL431 - 4 2026-07-18
UAL378 United Airlines 4 2026-06-02
UAL2668 - 4 2026-07-05
UAL2290 - 4 2026-07-16
UAL1160 United Airlines 4 2026-04-17
UAL1146 United Airlines 4 2026-04-17
UAL696 - 3 2026-07-01
UAL586 - 3 2026-06-20
UAL285 - 3 2026-06-29
UAL2780 United Airlines 3 2026-06-02
UAL2459 - 3 2026-07-12
UAL2449 United Airlines 3 2026-07-20
UAL2411 - 3 2026-07-02
UAL2271 - 3 2026-06-22
UAL2225 United Airlines 3 2026-04-15
UAL2050 - 3 2026-07-08
UAL2012 - 3 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2812 ORD → EWR Jul 26, 20:00 UTCJul 26, 21:15 UTC1h 15m
2026-07-26 UAL2135 EWR → MCO Jul 26, 14:15 UTCJul 26, 17:55 UTC3h 40m
2026-07-25 UAL2638 EWR → RSW Jul 25, 21:45 UTCJul 26, 01:50 UTC4h 5m
2026-07-25 UAL2135 EWR → MCO Jul 25, 16:05 UTCJul 25, 19:45 UTC3h 40m
2026-07-24 UAL2638 EWR → RSW Jul 24, 22:35 UTCJul 25, 02:40 UTC4h 5m
2026-07-24 UAL2103 ORD → PHL Jul 24, 15:10 UTCJul 24, 21:10 UTC6h 0m
2026-07-24 UAL2074 IAD → DEN Jul 24, 10:50 UTCJul 24, 13:00 UTC2h 10m
2026-07-24 UAL2498 IAH → EWR Jul 24, 00:00 UTCJul 24, 02:30 UTC2h 30m
2026-07-23 UAL551 IAH → GCM Jul 23, 14:55 UTCJul 23, 21:20 UTC6h 25m
2026-07-23 UAL1935 ORD → LGA Jul 23, 10:55 UTCJul 23, 13:30 UTC2h 35m
2026-07-22 UAL653 MBJ → IAD Jul 22, 22:55 UTCJul 23, 01:05 UTC2h 10m
2026-07-22 UAL653 MBJ → IAD Jul 22, 22:14 UTCJul 23, 01:04 UTC2h 50m
2026-07-22 UAL1519 IAD → MBJ Jul 22, 17:55 UTCJul 22, 20:10 UTC2h 15m
2026-07-22 UAL1519 IAD → MBJ Jul 22, 16:58 UTCJul 22, 20:57 UTC3h 59m
2026-07-22 UAL525 AUS → IAD Jul 22, 12:45 UTCJul 22, 15:30 UTC2h 45m
2026-07-21 UAL2337 SFO → BOS Jul 21, 22:24 UTCJul 22, 00:58 UTC2h 34m
2026-07-21 UAL2337 SFO → BOS Jul 21, 22:10 UTCJul 22, 01:05 UTC2h 55m
2026-07-21 UAL1140 LAX → IAD Jul 21, 16:00 UTCJul 21, 20:20 UTC4h 20m
2026-07-21 UAL582 SFO → LAS Jul 21, 13:10 UTCJul 21, 14:15 UTC1h 5m
2026-07-21 UAL2615 IAD → SYR Jul 21, 09:10 UTCJul 21, 10:10 UTC1h 0m
2026-07-21 UAL1546 EWR → PBI Jul 21, 06:55 UTCJul 21, 07:45 UTC50m
2026-07-21 UAL2282 SAN → IAD Jul 21, 04:15 UTCJul 21, 05:00 UTC45m
2026-07-21 UAL751 SFO → LAS Jul 21, 01:30 UTCJul 21, 02:40 UTC1h 10m
2026-07-20 UAL2478 SAN → ORD Jul 20, 22:45 UTCJul 21, 00:00 UTC1h 14m
2026-07-20 UAL2449 SJC → IAH Jul 20, 19:20 UTCJul 20, 20:35 UTC1h 15m
2026-07-20 UAL2449 SJC → IAH Jul 20, 19:22 UTCJul 20, 20:30 UTC1h 8m
2026-07-20 UAL2449 SJC → IAH Jul 20, 16:25 UTCJul 20, 18:00 UTC1h 35m
2026-07-20 UAL233 DEN → SFO Jul 20, 04:40 UTCJul 20, 06:20 UTC1h 40m
2026-07-20 UAL2216 ORD → EWR Jul 20, 00:53 UTCJul 20, 03:03 UTC2h 10m
2026-07-20 UAL2216 ORD → EWR Jul 20, 00:55 UTCJul 20, 03:05 UTC2h 10m
2026-07-19 UAL1151 - Jul 19, 21:55 UTCJul 19, 23:35 UTC1h 40m
2026-07-19 UAL2309 - Jul 19, 18:50 UTCJul 19, 19:55 UTC1h 5m
2026-07-19 UAL2309 SAN → SFO Jul 19, 18:35 UTCJul 19, 19:48 UTC1h 13m
2026-07-19 UAL444 BNA → IAD Jul 19, 16:10 UTCJul 19, 17:25 UTC1h 15m
2026-07-19 UAL1954 SMF → SFO Jul 19, 13:10 UTCJul 19, 13:35 UTC25m
2026-07-18 UAL1208 DEN → SMF Jul 18, 22:15 UTCJul 19, 00:25 UTC2h 10m
2026-07-18 UAL708 - Jul 18, 19:40 UTCJul 18, 20:50 UTC1h 10m
2026-07-18 UAL2159 DCA → IAH Jul 18, 16:40 UTCJul 18, 17:45 UTC1h 5m
2026-07-18 UAL1877 - Jul 18, 14:15 UTCJul 18, 15:00 UTC45m
2026-07-18 UAL431 - Jul 18, 03:20 UTCJul 18, 03:55 UTC35m
2026-07-17 UAL1199 EWR → CLT Jul 17, 21:05 UTCJul 17, 23:05 UTC2h 0m
2026-07-17 UAL1547 - Jul 17, 17:44 UTCJul 17, 18:25 UTC40m
2026-07-17 UAL2789 - Jul 17, 14:55 UTCJul 17, 16:00 UTC1h 5m
2026-07-17 UAL2166 - Jul 17, 01:25 UTCJul 17, 02:20 UTC55m
2026-07-16 UAL1303 EWR → IAH Jul 16, 22:15 UTCJul 16, 23:44 UTC1h 30m
2026-07-16 UAL2290 ORD → DFW Jul 16, 18:40 UTCJul 16, 20:39 UTC2h 0m
2026-07-16 UAL2290 ORD → DFW Jul 16, 18:34 UTCJul 16, 20:32 UTC1h 58m
2026-07-16 UAL2298 YUL → ORD Jul 16, 14:00 UTCJul 16, 16:05 UTC2h 5m
2026-07-16 UAL2681 - Jul 16, 07:35 UTCJul 16, 12:14 UTC4h 40m
2026-07-16 UAL1083 - Jul 16, 03:10 UTCJul 16, 05:55 UTC2h 45m

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 N14228 page for operator, model, and routing details .

Mode-S A0ACDD frequently asked

What is Mode-S code A0ACDD?
A0ACDD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N14228.
Where is Mode-S A0ACDD registered?
Mode-S code A0ACDD 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 A0ACDD broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0ACDD, octal 50126335, decimal 10,530,013.
What flights does A0ACDD operate?
Mode-S A0ACDD has broadcast 20 distinct callsigns, including UAL1325, UAL678, UAL664, UAL431, UAL378.