Apparatus

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sensors Mode-S transponder

A52C4F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N432UA · AIRBUS A-320 · operated by UNITED AIRLINES INC

Hex
A52C4F
Octal
51226117
Decimal
10,824,783
Country
US
Tail
N432UA
Type
A320
No current signal · last broadcast Jul 26, 20:35 UTC
Flights observed
455
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:35 UTC

Last known position

Most recent position reported by Mode-S A52C4F.

Country allocation

The ICAO 24-bit address A52C4F 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
UAL817 - 6 2026-06-22
UAL718 United Airlines 5 2026-06-23
UAL2682 - 5 2026-07-16
UAL2160 United Airlines 5 2026-07-19
UAL2049 - 5 2026-07-19
UAL1564 - 5 2026-07-16
UAL1535 - 5 2026-07-16
UAL1482 - 5 2026-07-09
UAL529 - 4 2026-07-16
UAL355 United Airlines 4 2026-07-26
UAL313 United Airlines 4 2026-07-17
UAL2479 United Airlines 4 2026-07-25
UAL2329 United Airlines 4 2026-06-27
UAL1823 United Airlines 4 2026-07-17
UAL1747 - 4 2026-07-17
UAL1537 - 4 2026-06-13
UAL1452 United Airlines 4 2026-04-23
UAL1345 - 4 2026-07-17
UAL1256 United Airlines 4 2026-07-21
UAL1094 - 4 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL248 BOS → IAH Jul 26, 19:00 UTCJul 26, 20:30 UTC1h 30m
2026-07-26 UAL355 BUR → SFO Jul 26, 16:00 UTCJul 26, 17:30 UTC1h 30m
2026-07-26 UAL1354 SAT → IAD Jul 26, 02:30 UTCJul 26, 13:55 UTC11h 26m
2026-07-25 UAL2479 ORD → LAS Jul 25, 23:30 UTCJul 26, 01:15 UTC1h 45m
2026-07-25 UAL1819 IAH → EWR Jul 25, 22:05 UTCJul 25, 22:40 UTC35m
2026-07-25 UAL1660 ANC → EWR Jul 25, 17:20 UTCJul 25, 21:05 UTC3h 45m
2026-07-25 UAL2164 LAX → ORD Jul 25, 01:05 UTCJul 25, 03:30 UTC2h 25m
2026-07-24 UAL1978 EWR → SFO Jul 24, 13:45 UTCJul 24, 14:25 UTC40m
2026-07-23 UAL2200 EWR → SAN Jul 23, 23:11 UTCJul 24, 00:23 UTC1h 12m
2026-07-23 UAL2200 EWR → SAN Jul 23, 23:10 UTCJul 23, 23:45 UTC35m
2026-07-23 UAL2649 ORD → LAX Jul 23, 01:50 UTCJul 23, 03:55 UTC2h 5m
2026-07-22 UAL1707 SXM → ORD Jul 22, 19:40 UTCJul 22, 21:40 UTC2h 0m
2026-07-22 UAL489 DEN → IAH Jul 22, 15:50 UTCJul 22, 17:45 UTC1h 55m
2026-07-22 UAL1704 EWR → MSP Jul 22, 01:35 UTCJul 22, 03:25 UTC1h 50m
2026-07-21 UAL1866 FLL → EWR Jul 21, 20:50 UTCJul 21, 23:35 UTC2h 45m
2026-07-21 UAL1786 LAX → CLE Jul 21, 17:10 UTCJul 21, 19:40 UTC2h 30m
2026-07-21 UAL1256 RDU → DEN Jul 21, 13:00 UTCJul 21, 15:30 UTC2h 30m
2026-07-21 UAL2473 DEN → TYS Jul 21, 01:40 UTCJul 21, 04:00 UTC2h 20m
2026-07-20 UAL2609 - Jul 20, 20:35 UTCJul 20, 23:35 UTC3h 0m
2026-07-20 UAL1633 - Jul 20, 16:15 UTCJul 20, 19:00 UTC2h 45m
2026-07-20 UAL724 - Jul 20, 13:30 UTCJul 20, 14:40 UTC1h 10m
2026-07-20 UAL724 ELP → DEN Jul 20, 13:14 UTCJul 20, 14:35 UTC1h 21m
2026-07-20 UAL333 BOS → LAX Jul 20, 02:45 UTCJul 20, 03:50 UTC1h 5m
2026-07-19 UAL2049 DFW → DEN Jul 19, 23:55 UTCJul 20, 01:30 UTC1h 35m
2026-07-19 UAL2160 PHX → SFO Jul 19, 13:50 UTCJul 19, 15:20 UTC1h 30m
2026-07-19 UAL2656 SNA → DEN Jul 19, 01:25 UTCJul 19, 03:30 UTC2h 5m
2026-07-19 UAL2656 SNA → DEN Jul 19, 01:39 UTCJul 19, 03:27 UTC1h 48m
2026-07-18 UAL2657 IAD → EWR Jul 18, 22:20 UTCJul 19, 00:10 UTC1h 50m
2026-07-18 UAL1007 ORD → ALB Jul 18, 19:15 UTCJul 18, 20:55 UTC1h 40m
2026-07-18 UAL2625 DEN → SAT Jul 18, 16:30 UTCJul 18, 18:15 UTC1h 45m
2026-07-18 UAL1003 - Jul 18, 14:00 UTCJul 18, 14:35 UTC35m
2026-07-18 UAL8101 - Jul 18, 01:34 UTCJul 18, 02:05 UTC30m
2026-07-17 UAL2479 SAT → DEN Jul 17, 21:44 UTCJul 17, 23:35 UTC1h 50m
2026-07-17 UAL1819 - Jul 17, 19:45 UTCJul 17, 20:20 UTC35m
2026-07-17 UAL1747 AUS → IAH Jul 17, 17:32 UTCJul 17, 18:06 UTC34m
2026-07-17 UAL1747 - Jul 17, 17:30 UTCJul 17, 18:10 UTC40m
2026-07-17 UAL1823 SFO → DEN Jul 17, 15:25 UTCJul 17, 16:00 UTC35m
2026-07-17 UAL1823 SFO → DEN Jul 17, 15:39 UTCJul 17, 15:54 UTC15m
2026-07-17 UAL1345 YYZ → IAH Jul 17, 10:38 UTCJul 17, 13:20 UTC2h 42m
2026-07-17 UAL1345 - Jul 17, 10:35 UTCJul 17, 13:20 UTC2h 45m
2026-07-17 UAL313 BOI → SFO Jul 17, 00:50 UTCJul 17, 03:30 UTC2h 40m
2026-07-17 UAL313 BOI → SFO Jul 17, 00:43 UTCJul 17, 03:25 UTC2h 42m
2026-07-16 UAL2682 - Jul 16, 21:45 UTCJul 16, 22:59 UTC1h 15m
2026-07-16 UAL2682 DFW → IAH Jul 16, 21:23 UTCJul 16, 22:57 UTC1h 34m
2026-07-16 UAL1564 IAD → DFW Jul 16, 17:14 UTCJul 16, 20:15 UTC3h 0m
2026-07-16 UAL1535 - Jul 16, 14:45 UTCJul 16, 15:25 UTC40m
2026-07-16 UAL529 IAD → RDU Jul 16, 12:44 UTCJul 16, 13:25 UTC40m
2026-07-15 UAL2634 ATL → IAD Jul 15, 23:50 UTCJul 16, 01:20 UTC1h 30m
2026-07-15 UAL1671 DEN → ATL Jul 15, 19:45 UTCJul 15, 22:20 UTC2h 35m
2026-07-15 UAL1944 YYZ → DEN Jul 15, 15:10 UTCJul 15, 17:55 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 N432UA page for operator, model, and routing details .

Mode-S A52C4F frequently asked

What is Mode-S code A52C4F?
A52C4F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N432UA.
Where is Mode-S A52C4F registered?
Mode-S code A52C4F 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 A52C4F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A52C4F, octal 51226117, decimal 10,824,783.
What flights does A52C4F operate?
Mode-S A52C4F has broadcast 20 distinct callsigns, including UAL817, UAL718, UAL2682, UAL2160, UAL2049.