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
No current signal · last broadcast 1d ago
Flights observed
183
Distinct callsigns
20
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S AB3DC3.

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
UAL676 - 4 2026-07-02
UAL2030 United Airlines 4 2026-06-18
UAL472 United Airlines 3 2026-06-15
UAL2666 United Airlines 3 2026-04-13
UAL2320 United Airlines 3 2026-04-17
UAL1848 - 3 2026-06-23
UAL1760 United Airlines 3 2026-07-02
UAL1662 United Airlines 3 2026-04-17
UAL1541 - 3 2026-06-26
UAL1305 - 3 2026-06-27
UAL1092 - 3 2026-06-18
UAL732 - 2 2026-07-03
UAL657 - 2 2026-07-04
UAL591 - 2 2026-07-01
UAL581 United Airlines 2 2026-06-14
UAL543 - 2 2026-06-21
UAL447 - 2 2026-06-19
UAL429 United Airlines 2 2026-06-10
UAL421 United Airlines 2 2026-04-13
UAL3876 United Airlines 2 2026-04-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-04 UAL657 MSP → EWR Jul 4, 01:35 UTCJul 4, 03:40 UTC2h 5m
2026-07-04 UAL657 MSP → EWR Jul 4, 01:25 UTCJul 4, 03:42 UTC2h 17m
2026-07-03 UAL732 DEN → MSP Jul 3, 20:19 UTCJul 3, 21:34 UTC1h 15m
2026-07-03 UAL732 DEN → MSP Jul 3, 20:05 UTCJul 3, 21:35 UTC1h 30m
2026-07-03 UAL2004 ORD → SFO Jul 3, 17:01 UTCJul 3, 18:04 UTC1h 3m
2026-07-03 UAL2004 ORD → SFO Jul 3, 17:00 UTCJul 3, 18:05 UTC1h 5m
2026-07-03 UAL497 DEN → SLC Jul 3, 14:35 UTCJul 3, 15:40 UTC1h 5m
2026-07-03 UAL1268 - Jul 3, 03:30 UTCJul 3, 05:45 UTC2h 15m
2026-07-03 UAL1608 - Jul 3, 00:25 UTCJul 3, 02:10 UTC1h 45m
2026-07-02 UAL546 - Jul 2, 19:40 UTCJul 2, 21:20 UTC1h 40m
2026-07-02 UAL570 BOS → EWR Jul 2, 16:20 UTCJul 2, 18:05 UTC1h 45m
2026-07-02 UAL1760 IAH → RDU Jul 2, 11:15 UTCJul 2, 14:35 UTC3h 20m
2026-07-02 UAL676 EWR → AUS Jul 2, 01:00 UTCJul 2, 04:10 UTC3h 10m
2026-07-01 UAL676 EWR → AUS Jul 1, 23:55 UTCJul 2, 04:10 UTC4h 15m
2026-07-01 UAL1261 - Jul 1, 18:40 UTCJul 1, 22:10 UTC3h 30m
2026-07-01 UAL1261 SAT → EWR Jul 1, 18:46 UTCJul 1, 22:03 UTC3h 17m
2026-07-01 UAL591 EWR → SAT Jul 1, 13:55 UTCJul 1, 17:03 UTC3h 8m
2026-07-01 UAL591 - Jul 1, 13:50 UTCJul 1, 17:00 UTC3h 10m
2026-07-01 UAL299 ATL → EWR Jul 1, 10:20 UTCJul 1, 12:10 UTC1h 50m
2026-07-01 UAL1398 - Jul 1, 00:00 UTCJul 1, 01:20 UTC1h 20m
2026-06-30 UAL516 ATL → ORD Jun 30, 19:45 UTCJun 30, 21:30 UTC1h 45m
2026-06-30 UAL471 IAD → ATL Jun 30, 16:50 UTCJun 30, 18:05 UTC1h 15m
2026-06-30 UAL1434 - Jun 30, 13:25 UTCJun 30, 15:05 UTC1h 40m
2026-06-29 UAL293 IAD → JAX Jun 29, 22:17 UTCJun 29, 23:32 UTC1h 15m
2026-06-29 UAL293 - Jun 29, 22:10 UTCJun 29, 23:34 UTC1h 25m
2026-06-29 UAL1831 ATL → IAD Jun 29, 19:00 UTCJun 29, 20:19 UTC1h 20m
2026-06-29 UAL2684 PHL → ORD Jun 29, 15:39 UTCJun 29, 17:05 UTC1h 25m
2026-06-29 UAL786 ATL → EWR Jun 29, 12:29 UTCJun 29, 13:54 UTC1h 25m
2026-06-29 UAL2762 ORD → ICT Jun 29, 04:38 UTCJun 29, 05:53 UTC1h 15m
2026-06-29 UAL2762 ORD → ICT Jun 29, 04:30 UTCJun 29, 05:54 UTC1h 25m
2026-06-28 UAL2144 EUG → ORD Jun 28, 22:59 UTCJun 29, 02:39 UTC3h 40m
2026-06-28 UAL2483 - Jun 28, 17:44 UTCJun 28, 21:40 UTC3h 55m
2026-06-28 UAL364 ATL → ORD Jun 28, 14:39 UTCJun 28, 16:25 UTC1h 45m
2026-06-27 UAL1991 EWR → ATL Jun 27, 21:44 UTCJun 27, 23:29 UTC1h 45m
2026-06-27 UAL353 - Jun 27, 17:29 UTCJun 27, 19:59 UTC2h 30m
2026-06-27 UAL2018 EWR → PBI Jun 27, 13:40 UTCJun 27, 16:04 UTC2h 25m
2026-06-27 UAL299 ATL → EWR Jun 27, 10:19 UTCJun 27, 11:59 UTC1h 40m
2026-06-27 UAL1305 DEN → ATL Jun 27, 00:20 UTCJun 27, 02:55 UTC2h 35m
2026-06-26 UAL2325 - Jun 26, 20:10 UTCJun 26, 23:00 UTC2h 50m
2026-06-26 UAL2325 MSY → DEN Jun 26, 20:07 UTCJun 26, 22:57 UTC2h 50m
2026-06-26 UAL2273 DEN → MSY Jun 26, 16:54 UTCJun 26, 19:09 UTC2h 15m
2026-06-26 UAL1376 MSY → DEN Jun 26, 13:10 UTCJun 26, 15:34 UTC2h 25m
2026-06-26 UAL1541 DEN → MSY Jun 26, 00:10 UTCJun 26, 02:24 UTC2h 15m
2026-06-25 UAL2255 - Jun 25, 13:55 UTCJun 25, 14:29 UTC35m
2026-06-25 UAL2173 - Jun 25, 02:30 UTCJun 25, 02:49 UTC20m
2026-06-24 UAL2272 MSP → DEN Jun 24, 23:24 UTCJun 25, 01:19 UTC1h 55m
2026-06-24 UAL2272 MSP → DEN Jun 24, 23:15 UTCJun 25, 01:09 UTC1h 54m
2026-06-24 UAL1068 EWR → MSP Jun 24, 18:09 UTCJun 24, 20:44 UTC2h 35m
2026-06-24 UAL1068 EWR → MSP Jun 24, 18:17 UTCJun 24, 20:43 UTC2h 26m
2026-06-24 UAL2175 BNA → EWR Jun 24, 14:41 UTCJun 24, 15:57 UTC1h 16m

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?
No active broadcast right now. Last signal was 1d ago.
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 UAL676, UAL2030, UAL472, UAL2666, UAL2320.