Apparatus

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sensors Mode-S transponder

A53774

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N435UA · AIRBUS A-320 · operated by UNITED AIRLINES INC

Hex
A53774
Octal
51233564
Decimal
10,827,636
Country
US
Tail
N435UA
Type
A320
No current signal · last broadcast 2h ago
Flights observed
333
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A53774.

Country allocation

The ICAO 24-bit address A53774 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
UAL2195 United Airlines 6 2026-05-17
UAL2273 United Airlines 5 2026-05-08
UAL1564 - 5 2026-07-11
UAL2850 United Airlines 4 2026-06-13
UAL1874 United Airlines 4 2026-05-18
UAL792 United Airlines 3 2026-06-10
UAL654 United Airlines 3 2026-05-13
UAL626 - 3 2026-04-13
UAL425 United Airlines 3 2026-06-09
UAL341 United Airlines 3 2026-05-12
UAL2805 United Airlines 3 2026-06-20
UAL2479 - 3 2026-07-12
UAL246 United Airlines 3 2026-04-14
UAL2331 United Airlines 3 2026-04-28
UAL2225 - 3 2026-06-22
UAL2134 United Airlines 3 2026-05-08
UAL2105 United Airlines 3 2026-05-13
UAL1728 United Airlines 3 2026-06-10
UAL1550 United Airlines 3 2026-05-07
UAL1483 United Airlines 3 2026-05-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL2334 - Jul 14, 01:50 UTCJul 14, 03:00 UTC1h 10m
2026-07-13 UAL1337 DEN → PDX Jul 13, 22:25 UTCJul 14, 00:35 UTC2h 10m
2026-07-13 UAL1741 - Jul 13, 20:05 UTCJul 13, 21:05 UTC1h 0m
2026-07-13 UAL1402 - Jul 13, 17:55 UTCJul 13, 18:50 UTC55m
2026-07-13 UAL1402 DEN → ABQ Jul 13, 17:37 UTCJul 13, 18:49 UTC1h 12m
2026-07-13 UAL2383 - Jul 13, 12:35 UTCJul 13, 15:35 UTC3h 0m
2026-07-13 UAL2671 DEN → RDU Jul 13, 01:01 UTCJul 13, 04:00 UTC3h 0m
2026-07-12 UAL2479 - Jul 12, 21:45 UTCJul 12, 23:35 UTC1h 50m
2026-07-12 UAL1819 - Jul 12, 19:45 UTCJul 12, 20:35 UTC50m
2026-07-12 UAL1747 - Jul 12, 17:50 UTCJul 12, 18:30 UTC40m
2026-07-12 UAL1747 AUS → IAH Jul 12, 17:32 UTCJul 12, 18:32 UTC1h 0m
2026-07-12 UAL1823 - Jul 12, 15:55 UTCJul 12, 16:25 UTC30m
2026-07-12 UAL1345 - Jul 12, 10:30 UTCJul 12, 13:15 UTC2h 45m
2026-07-12 UAL313 - Jul 12, 00:15 UTCJul 12, 03:01 UTC2h 45m
2026-07-11 UAL2682 - Jul 11, 21:30 UTCJul 11, 22:15 UTC45m
2026-07-11 UAL1564 IAD → DFW Jul 11, 16:55 UTCJul 11, 19:40 UTC2h 45m
2026-07-11 UAL1564 IAD → DFW Jul 11, 16:56 UTCJul 11, 19:30 UTC2h 34m
2026-07-11 UAL1535 - Jul 11, 14:55 UTCJul 11, 15:35 UTC40m
2026-07-11 UAL529 IAD → RDU Jul 11, 12:40 UTCJul 11, 13:20 UTC40m
2026-07-11 UAL1460 BNA → IAD Jul 11, 02:00 UTCJul 11, 03:20 UTC1h 20m
2026-07-10 UAL1109 DEN → BNA Jul 10, 22:20 UTCJul 11, 00:20 UTC2h 0m
2026-07-10 UAL3880 - Jul 10, 15:30 UTCJul 10, 18:20 UTC2h 50m
2026-06-25 UAL3898 - Jun 25, 00:29 UTCJun 25, 01:59 UTC1h 30m
2026-06-23 UAL2224 - Jun 23, 22:34 UTCJun 23, 23:29 UTC55m
2026-06-23 UAL686 EWR → IAD Jun 23, 20:19 UTCJun 23, 21:14 UTC55m
2026-06-23 UAL686 EWR → IAD Jun 23, 20:27 UTCJun 23, 21:11 UTC44m
2026-06-23 UAL1366 - Jun 23, 16:29 UTCJun 23, 16:59 UTC30m
2026-06-23 UAL1366 BNA → IAH Jun 23, 16:24 UTCJun 23, 17:59 UTC1h 35m
2026-06-23 UAL2174 - Jun 23, 12:49 UTCJun 23, 14:35 UTC1h 45m
2026-06-23 UAL1660 - Jun 23, 00:09 UTCJun 23, 03:49 UTC3h 40m
2026-06-22 UAL2164 DEN → SEA Jun 22, 20:10 UTCJun 22, 22:34 UTC2h 25m
2026-06-22 UAL1829 EWR → SFO Jun 22, 17:55 UTCJun 22, 18:40 UTC45m
2026-06-22 UAL2847 ORD → RAP Jun 22, 14:05 UTCJun 22, 15:45 UTC1h 40m
2026-06-22 UAL2225 - Jun 22, 10:19 UTCJun 22, 12:30 UTC2h 10m
2026-06-22 UAL2792 IAD → SFO Jun 22, 00:14 UTCJun 22, 01:40 UTC1h 25m
2026-06-21 UAL1655 BNA → EWR Jun 21, 21:44 UTCJun 21, 22:00 UTC15m
2026-06-21 UAL1655 BNA → EWR Jun 21, 18:48 UTCJun 21, 21:29 UTC2h 41m
2026-06-21 UAL764 DEN → BOS Jun 21, 13:59 UTCJun 21, 16:59 UTC3h 0m
2026-06-21 UAL224 - Jun 21, 10:09 UTCJun 21, 11:55 UTC1h 45m
2026-06-21 UAL1583 ORD → RIC Jun 21, 00:02 UTCJun 21, 01:19 UTC1h 17m
2026-06-20 UAL1583 - Jun 20, 23:59 UTCJun 21, 01:19 UTC1h 20m
2026-06-20 UAL1180 DEN → CID Jun 20, 13:55 UTCJun 20, 21:30 UTC7h 35m
2026-06-20 UAL2805 EWR → HNL Jun 20, 10:20 UTCJun 20, 11:34 UTC1h 15m
2026-06-19 UAL1732 - Jun 19, 23:29 UTCJun 20, 00:29 UTC1h 0m
2026-06-19 UAL1180 DEN → CID Jun 19, 14:04 UTCJun 19, 21:14 UTC7h 10m
2026-06-19 UAL466 - Jun 19, 11:54 UTCJun 19, 12:49 UTC55m
2026-06-19 UAL1492 PHL → IAH Jun 19, 03:09 UTCJun 19, 03:55 UTC45m
2026-06-18 UAL697 - Jun 18, 22:50 UTCJun 19, 01:10 UTC2h 19m
2026-06-18 UAL2844 BWI → ORD Jun 18, 19:00 UTCJun 18, 21:20 UTC2h 20m
2026-06-18 UAL704 - Jun 18, 15:35 UTCJun 18, 17:15 UTC1h 40m

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 N435UA page for operator, model, and routing details .

Mode-S A53774 frequently asked

What is Mode-S code A53774?
A53774 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N435UA.
Where is Mode-S A53774 registered?
Mode-S code A53774 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 A53774 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A53774, octal 51233564, decimal 10,827,636.
What flights does A53774 operate?
Mode-S A53774 has broadcast 20 distinct callsigns, including UAL2195, UAL2273, UAL1564, UAL2850, UAL1874.