Apparatus

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sensors Mode-S transponder

AB3DC3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N823UA · AIRBUS A-319 · operated by UNITED AIRLINES INC

Hex
AB3DC3
Octal
52636703
Decimal
11,222,467
Country
US
Tail
N823UA
Type
A319
Broadcasting now · callsign UAL429 · 33,975 ft
Flights observed
291
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:35 UTC

Current position

AB3DC3 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AB3DC3 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
UAL1848 - 7 2026-07-07
UAL1541 United Airlines 5 2026-07-17
UAL1152 - 5 2026-07-07
UAL676 - 4 2026-07-02
UAL472 - 4 2026-07-15
UAL471 United Airlines 4 2026-07-24
UAL456 United Airlines 4 2026-07-17
UAL2317 - 4 2026-07-15
UAL2030 United Airlines 4 2026-06-18
UAL1410 - 4 2026-07-14
UAL642 United Airlines 3 2026-07-23
UAL516 United Airlines 3 2026-07-24
UAL293 United Airlines 3 2026-07-23
UAL2680 - 3 2026-07-19
UAL2666 United Airlines 3 2026-04-13
UAL2320 United Airlines 3 2026-04-17
UAL2033 - 3 2026-07-16
UAL1760 United Airlines 3 2026-07-02
UAL1687 United Airlines 3 2026-07-19
UAL1662 United Airlines 3 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2027 MSP → EWR Jul 26, 21:00 UTCJul 26, 22:20 UTC1h 20m
2026-07-26 UAL2128 SLC → SFO Jul 26, 18:10 UTCJul 26, 18:50 UTC40m
2026-07-26 UAL2128 SLC → SFO Jul 26, 18:05 UTCJul 26, 19:29 UTC1h 24m
2026-07-26 UAL1521 IAD → MSY Jul 26, 14:25 UTCJul 26, 15:55 UTC1h 30m
2026-07-26 UAL1521 IAD → MSY Jul 26, 14:32 UTCJul 26, 15:51 UTC1h 19m
2026-07-26 UAL1780 PDX → SFO Jul 26, 01:40 UTCJul 26, 03:35 UTC1h 55m
2026-07-25 UAL1420 MCO → EWR Jul 25, 21:35 UTCJul 25, 23:30 UTC1h 55m
2026-07-25 UAL587 EWR → MSP Jul 25, 19:50 UTCJul 25, 20:20 UTC30m
2026-07-25 UAL2437 LGA → DEN Jul 25, 16:35 UTCJul 25, 17:40 UTC1h 5m
2026-07-25 UAL1484 LAX → SFO Jul 25, 13:55 UTCJul 25, 14:55 UTC1h 0m
2026-07-25 UAL1486 DEN → FAT Jul 25, 11:30 UTCJul 25, 12:10 UTC40m
2026-07-24 UAL2790 BWI → EWR Jul 24, 23:55 UTCJul 25, 00:25 UTC30m
2026-07-24 UAL516 SFO → LAX Jul 24, 20:40 UTCJul 24, 22:10 UTC1h 30m
2026-07-24 UAL471 IAD → BOS Jul 24, 18:05 UTCJul 24, 19:30 UTC1h 25m
2026-07-24 UAL471 IAD → BOS Jul 24, 17:26 UTCJul 24, 19:27 UTC2h 1m
2026-07-24 UAL1434 SFO → LAX Jul 24, 13:35 UTCJul 24, 15:05 UTC1h 30m
2026-07-23 UAL293 EWR → DFW Jul 23, 23:10 UTCJul 24, 00:35 UTC1h 25m
2026-07-23 UAL1831 RNO → SFO Jul 23, 20:20 UTCJul 23, 21:40 UTC1h 20m
2026-07-23 UAL642 CHS → EWR Jul 23, 17:00 UTCJul 23, 18:50 UTC1h 50m
2026-07-23 2053 ATL → EWR Jul 23, 13:10 UTCJul 23, 14:55 UTC1h 45m
2026-07-23 UAL1398 - Jul 23, 00:00 UTCJul 23, 01:30 UTC1h 30m
2026-07-22 UAL516 SFO → LAX Jul 22, 19:55 UTCJul 22, 21:35 UTC1h 40m
2026-07-22 UAL471 IAD → BOS Jul 22, 17:00 UTCJul 22, 18:30 UTC1h 30m
2026-07-22 UAL1434 SFO → LAX Jul 22, 13:30 UTCJul 22, 14:55 UTC1h 25m
2026-07-21 3886 - Jul 21, 21:45 UTCJul 21, 22:30 UTC45m
2026-07-21 UAL642 CHS → EWR Jul 21, 17:20 UTCJul 21, 19:35 UTC2h 15m
2026-07-21 UAL642 CHS → EWR Jul 21, 15:22 UTCJul 21, 19:30 UTC4h 8m
2026-07-21 UAL2053 SFO → PDX Jul 21, 11:30 UTCJul 21, 13:15 UTC1h 45m
2026-07-21 UAL8170 - Jul 21, 01:35 UTCJul 21, 03:10 UTC1h 35m
2026-07-21 UAL8170 ORD → ATL Jul 21, 01:47 UTCJul 21, 03:03 UTC1h 16m
2026-07-20 UAL1067 IAH → BOS Jul 20, 22:05 UTCJul 20, 23:45 UTC1h 40m
2026-07-20 UAL2343 RSW → DEN Jul 20, 19:35 UTCJul 20, 20:50 UTC1h 15m
2026-07-20 UAL1660 ANC → EWR Jul 20, 15:45 UTCJul 20, 16:15 UTC30m
2026-07-20 UAL2093 ORD → MSN Jul 20, 14:15 UTCJul 20, 14:40 UTC25m
2026-07-20 UAL1486 - Jul 20, 11:25 UTCJul 20, 12:25 UTC1h 0m
2026-07-20 UAL1486 TVC → ORD Jul 20, 11:32 UTCJul 20, 12:02 UTC30m
2026-07-19 UAL2790 - Jul 19, 23:50 UTCJul 20, 00:20 UTC30m
2026-07-19 UAL2680 IND → ORD Jul 19, 20:55 UTCJul 19, 21:40 UTC45m
2026-07-19 UAL1687 MSY → SFO Jul 19, 17:10 UTCJul 19, 19:00 UTC1h 50m
2026-07-19 UAL1687 MSY → SFO Jul 19, 17:12 UTCJul 19, 19:00 UTC1h 48m
2026-07-19 UAL428 - Jul 19, 12:55 UTCJul 19, 14:40 UTC1h 45m
2026-07-19 UAL428 MEX → IAH Jul 19, 12:54 UTCJul 19, 14:37 UTC1h 43m
2026-07-18 UAL1090 - Jul 18, 19:35 UTCJul 18, 21:40 UTC2h 5m
2026-07-18 UAL425 - Jul 18, 15:55 UTCJul 18, 17:25 UTC1h 30m
2026-07-18 UAL1030 SAT → EWR Jul 18, 12:55 UTCJul 18, 14:30 UTC1h 35m
2026-07-18 UAL1871 MCO → EWR Jul 18, 00:55 UTCJul 18, 01:30 UTC35m
2026-07-17 UAL1899 DEN → AUS Jul 17, 21:55 UTCJul 17, 23:39 UTC1h 45m
2026-07-17 UAL1541 IAH → LGA Jul 17, 18:12 UTCJul 17, 19:44 UTC1h 32m
2026-07-17 UAL1541 IAH → LGA Jul 17, 18:05 UTCJul 17, 19:49 UTC1h 45m
2026-07-17 UAL456 EWR → SRQ Jul 17, 14:20 UTCJul 17, 16:10 UTC1h 50m

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 N823UA page for operator, model, and routing details .

Mode-S AB3DC3 frequently asked

What is Mode-S code AB3DC3?
AB3DC3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N823UA.
Where is Mode-S AB3DC3 registered?
Mode-S code AB3DC3 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 AB3DC3 broadcasting right now?
Yes. Mode-S AB3DC3 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB3DC3, octal 52636703, decimal 11,222,467.
What flights does AB3DC3 operate?
Mode-S AB3DC3 has broadcast 20 distinct callsigns, including UAL1848, UAL1541, UAL1152, UAL676, UAL472.