Apparatus

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sensors Mode-S transponder

A57796

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N451UA · AIRBUS A-320 · operated by UNITED AIRLINES INC

Hex
A57796
Octal
51273626
Decimal
10,844,054
Country
US
Tail
N451UA
Type
A320
Broadcasting now · callsign UAL224 · 29,950 ft
Flights observed
502
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Current position

A57796 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A57796 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
UAL568 - 7 2026-07-18
UAL333 - 7 2026-07-01
UAL2838 - 6 2026-06-30
UAL1537 - 6 2026-07-10
UAL702 United Airlines 5 2026-06-17
UAL456 United Airlines 5 2026-07-25
UAL2866 - 5 2026-06-17
UAL1874 - 5 2026-07-18
UAL1809 - 5 2026-06-17
UAL1269 United Airlines 5 2026-05-29
UAL704 United Airlines 4 2026-05-29
UAL652 - 4 2026-07-23
UAL645 United Airlines 4 2026-07-19
UAL2787 - 4 2026-06-30
UAL2742 United Airlines 4 2026-07-20
UAL2609 United Airlines 4 2026-07-02
UAL2447 United Airlines 4 2026-07-25
UAL2386 - 4 2026-06-16
UAL2329 - 4 2026-07-11
UAL1763 United Airlines 4 2026-05-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1717 PVR → ORD Jul 26, 20:30 UTCJul 26, 21:30 UTC1h 0m
2026-07-26 UAL2193 ATL → EWR Jul 26, 17:50 UTCJul 26, 18:20 UTC30m
2026-07-26 UAL1256 RDU → DEN Jul 26, 13:00 UTCJul 26, 15:35 UTC2h 35m
2026-07-25 UAL2473 LAX → EWR Jul 25, 23:45 UTCJul 26, 02:00 UTC2h 15m
2026-07-25 UAL2447 RSW → EWR Jul 25, 20:01 UTCJul 25, 21:39 UTC1h 38m
2026-07-25 UAL2447 RSW → EWR Jul 25, 19:55 UTCJul 25, 21:40 UTC1h 45m
2026-07-25 UAL456 EWR → SRQ Jul 25, 14:15 UTCJul 25, 15:55 UTC1h 40m
2026-07-25 UAL1835 EWR → MSY Jul 25, 00:45 UTCJul 25, 02:15 UTC1h 30m
2026-07-24 UAL2246 RSW → EWR Jul 24, 20:15 UTCJul 24, 21:00 UTC45m
2026-07-24 UAL2049 EUG → SFO Jul 24, 16:50 UTCJul 24, 18:25 UTC1h 35m
2026-07-24 UAL2160 PHX → SFO Jul 24, 13:50 UTCJul 24, 15:20 UTC1h 30m
2026-07-24 UAL1225 ONT → SFO Jul 24, 02:05 UTCJul 24, 04:20 UTC2h 15m
2026-07-24 UAL1225 ONT → SFO Jul 24, 02:00 UTCJul 24, 04:09 UTC2h 9m
2026-07-23 UAL1604 SFO → BNA Jul 23, 22:20 UTCJul 24, 00:10 UTC1h 50m
2026-07-23 UAL1380 IAD → DFW Jul 23, 19:10 UTCJul 23, 20:55 UTC1h 45m
2026-07-23 UAL652 DEN → STL Jul 23, 15:50 UTCJul 23, 17:20 UTC1h 30m
2026-07-23 UAL3915 BOS → SFO Jul 23, 13:30 UTCJul 23, 14:30 UTC1h 0m
2026-07-23 UAL3903 OGG → SFO Jul 23, 00:35 UTCJul 23, 01:05 UTC30m
2026-07-20 UAL2193 ATL → EWR Jul 20, 17:30 UTCJul 20, 18:05 UTC35m
2026-07-20 UAL2742 LAX → SFO Jul 20, 14:55 UTCJul 20, 16:05 UTC1h 10m
2026-07-19 UAL645 LAX → EWR Jul 19, 23:51 UTCJul 20, 00:52 UTC1h 1m
2026-07-19 UAL645 LAX → EWR Jul 19, 23:50 UTCJul 20, 00:55 UTC1h 5m
2026-07-19 UAL1766 BNA → DEN Jul 19, 20:20 UTCJul 19, 22:35 UTC2h 15m
2026-07-19 UAL1766 BNA → DEN Jul 19, 19:48 UTCJul 19, 22:31 UTC2h 43m
2026-07-19 UAL1048 DEN → BNA Jul 19, 16:15 UTCJul 19, 18:30 UTC2h 15m
2026-07-19 UAL1767 - Jul 19, 13:40 UTCJul 19, 14:10 UTC30m
2026-07-19 UAL2781 - Jul 19, 01:25 UTCJul 19, 01:50 UTC25m
2026-07-18 UAL568 YYZ → DEN Jul 18, 20:54 UTCJul 18, 23:39 UTC2h 45m
2026-07-18 UAL568 YYZ → DEN Jul 18, 20:50 UTCJul 18, 23:40 UTC2h 50m
2026-07-18 UAL1874 DEN → YYZ Jul 18, 16:45 UTCJul 18, 19:20 UTC2h 35m
2026-07-18 UAL1225 ONT → SFO Jul 18, 02:00 UTCJul 18, 03:40 UTC1h 41m
2026-07-17 UAL1604 - Jul 17, 22:25 UTCJul 18, 00:10 UTC1h 45m
2026-07-17 UAL1380 STL → DEN Jul 17, 19:15 UTCJul 17, 20:55 UTC1h 40m
2026-07-17 UAL652 DEN → STL Jul 17, 15:56 UTCJul 17, 17:20 UTC1h 24m
2026-07-17 UAL652 DEN → STL Jul 17, 15:44 UTCJul 17, 17:25 UTC1h 40m
2026-07-17 UAL1003 - Jul 17, 13:45 UTCJul 17, 14:15 UTC30m
2026-07-17 UAL1483 DEN → MTJ Jul 17, 01:32 UTCJul 17, 02:06 UTC34m
2026-07-17 UAL1483 - Jul 17, 01:39 UTCJul 17, 02:05 UTC25m
2026-07-16 UAL1866 - Jul 16, 20:29 UTCJul 16, 23:05 UTC2h 35m
2026-07-16 UAL1786 DEN → GSP Jul 16, 16:49 UTCJul 16, 19:25 UTC2h 35m
2026-07-16 UAL1846 - Jul 16, 13:10 UTCJul 16, 13:30 UTC20m
2026-07-16 UAL1846 DTW → DEN Jul 16, 13:02 UTCJul 16, 15:36 UTC2h 34m
2026-07-16 UAL1220 DEN → DTW Jul 16, 00:10 UTCJul 16, 02:33 UTC2h 23m
2026-07-16 UAL1220 - Jul 16, 00:05 UTCJul 16, 02:35 UTC2h 30m
2026-07-15 UAL1942 EUG → DEN Jul 15, 20:50 UTCJul 15, 22:55 UTC2h 5m
2026-07-15 UAL790 - Jul 15, 18:05 UTCJul 15, 19:05 UTC1h 0m
2026-07-15 UAL336 - Jul 15, 14:50 UTCJul 15, 16:45 UTC1h 55m
2026-07-15 UAL1306 - Jul 15, 02:05 UTCJul 15, 02:30 UTC25m
2026-07-14 UAL2479 SAT → DEN Jul 14, 21:40 UTCJul 14, 23:35 UTC1h 54m
2026-07-14 UAL1819 - Jul 14, 20:00 UTCJul 14, 20:40 UTC40m

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 N451UA page for operator, model, and routing details .

Mode-S A57796 frequently asked

What is Mode-S code A57796?
A57796 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N451UA.
Where is Mode-S A57796 registered?
Mode-S code A57796 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 A57796 broadcasting right now?
Yes. Mode-S A57796 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A57796, octal 51273626, decimal 10,844,054.
What flights does A57796 operate?
Mode-S A57796 has broadcast 20 distinct callsigns, including UAL568, UAL333, UAL2838, UAL1537, UAL702.