Apparatus

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sensors Mode-S transponder

AB3A0C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N822UA · AIRBUS A-319 · operated by UNITED AIRLINES INC

Hex
AB3A0C
Octal
52635014
Decimal
11,221,516
Country
US
Tail
N822UA
Type
A319
No current signal · last broadcast 9h ago
Flights observed
404
Distinct callsigns
20
Country
US
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S AB3A0C.

Country allocation

The ICAO 24-bit address AB3A0C 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
UAL283 - 7 2026-07-01
UAL285 United Airlines 6 2026-05-17
UAL2279 United Airlines 6 2026-05-15
UAL1535 United Airlines 6 2026-06-04
UAL1439 - 6 2026-07-02
UAL1394 United Airlines 6 2026-05-15
UAL732 - 5 2026-07-01
UAL365 United Airlines 5 2026-05-17
UAL340 - 5 2026-07-14
UAL2272 - 5 2026-07-11
UAL773 - 4 2026-07-03
UAL373 United Airlines 4 2026-05-15
UAL2822 United Airlines 4 2026-06-09
UAL2498 United Airlines 4 2026-05-17
UAL2097 - 4 2026-07-15
UAL1639 - 4 2026-07-16
UAL1327 - 4 2026-07-16
UAL1095 United Airlines 4 2026-05-15
UAL822 - 3 2026-07-15
UAL570 United Airlines 3 2026-06-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 UAL1517 DFW → ORD Jul 18, 01:20 UTCJul 18, 03:15 UTC1h 56m
2026-07-18 UAL1517 DFW → ORD Jul 18, 01:15 UTCJul 18, 02:58 UTC1h 43m
2026-07-17 UAL793 SFO → ORD Jul 17, 21:20 UTCJul 17, 23:10 UTC1h 50m
2026-07-17 UAL745 ATL → ORD Jul 17, 17:35 UTCJul 17, 19:40 UTC2h 5m
2026-07-17 UAL530 ORD → ATL Jul 17, 14:55 UTCJul 17, 16:15 UTC1h 20m
2026-07-17 UAL1476 - Jul 17, 04:44 UTCJul 17, 05:50 UTC1h 5m
2026-07-17 UAL2207 - Jul 17, 02:30 UTCJul 17, 03:30 UTC1h 0m
2026-07-16 UAL1639 STL → ORD Jul 16, 23:15 UTCJul 17, 00:04 UTC50m
2026-07-16 UAL1639 DEN → STL Jul 16, 19:45 UTCJul 16, 21:35 UTC1h 50m
2026-07-16 UAL1327 ATL → DEN Jul 16, 15:25 UTCJul 16, 18:05 UTC2h 40m
2026-07-16 UAL1635 IAD → ATL Jul 16, 03:05 UTCJul 16, 04:15 UTC1h 10m
2026-07-16 UAL1635 IAD → ATL Jul 16, 02:55 UTCJul 16, 04:11 UTC1h 16m
2026-07-15 UAL1240 DFW → IAD Jul 15, 22:25 UTCJul 16, 01:00 UTC2h 35m
2026-07-15 UAL2842 - Jul 15, 17:50 UTCJul 15, 21:10 UTC3h 20m
2026-07-15 UAL822 MEX → SFO Jul 15, 11:30 UTCJul 15, 15:25 UTC3h 55m
2026-07-15 UAL412 SFO → MEX Jul 15, 06:15 UTCJul 15, 10:10 UTC3h 55m
2026-07-15 UAL2097 SLC → SFO Jul 15, 03:15 UTCJul 15, 04:50 UTC1h 35m
2026-07-15 UAL2097 SLC → SFO Jul 15, 03:16 UTCJul 15, 04:46 UTC1h 30m
2026-07-15 UAL543 SFO → SLC Jul 15, 00:26 UTCJul 15, 01:46 UTC1h 20m
2026-07-15 UAL543 SFO → SLC Jul 15, 00:25 UTCJul 15, 01:55 UTC1h 30m
2026-07-14 UAL1453 BUR → SFO Jul 14, 21:45 UTCJul 14, 22:45 UTC59m
2026-07-14 UAL2154 DEN → BUR Jul 14, 17:35 UTCJul 14, 19:30 UTC1h 55m
2026-07-14 UAL340 ATL → DEN Jul 14, 11:40 UTCJul 14, 14:15 UTC2h 35m
2026-07-14 UAL2770 - Jul 14, 02:15 UTCJul 14, 03:40 UTC1h 25m
2026-07-13 UAL2770 - Jul 13, 23:05 UTCJul 14, 00:10 UTC1h 5m
2026-07-13 UAL1634 - Jul 13, 19:50 UTCJul 13, 20:45 UTC55m
2026-07-13 UAL2437 - Jul 13, 16:35 UTCJul 13, 17:45 UTC1h 10m
2026-07-13 UAL2266 - Jul 13, 13:10 UTCJul 13, 14:40 UTC1h 30m
2026-07-13 UAL2260 - Jul 13, 10:30 UTCJul 13, 11:10 UTC40m
2026-07-13 UAL1949 - Jul 13, 02:45 UTCJul 13, 03:50 UTC1h 5m
2026-07-12 UAL2323 - Jul 12, 23:25 UTCJul 13, 00:05 UTC40m
2026-07-12 UAL1022 - Jul 12, 20:20 UTCJul 12, 22:05 UTC1h 45m
2026-07-12 UAL586 SJC → DEN Jul 12, 15:55 UTCJul 12, 18:01 UTC2h 5m
2026-07-12 UAL2745 DEN → SJC Jul 12, 02:01 UTCJul 12, 04:05 UTC2h 5m
2026-07-11 UAL2272 MSP → DEN Jul 11, 22:15 UTCJul 11, 23:50 UTC1h 35m
2026-07-11 UAL1068 EWR → MSP Jul 11, 18:10 UTCJul 11, 20:30 UTC2h 20m
2026-07-11 UAL2394 BOS → EWR Jul 11, 15:25 UTCJul 11, 16:30 UTC1h 5m
2026-07-11 UAL2394 BOS → EWR Jul 11, 15:25 UTCJul 11, 16:17 UTC52m
2026-07-11 UAL1110 - Jul 11, 13:25 UTCJul 11, 14:25 UTC1h 0m
2026-07-11 UAL555 ATL → EWR Jul 11, 00:20 UTCJul 11, 02:10 UTC1h 50m
2026-07-10 UAL1307 EWR → ATL Jul 10, 20:50 UTCJul 10, 22:40 UTC1h 50m
2026-07-10 UAL1705 ATL → EWR Jul 10, 13:50 UTCJul 10, 15:45 UTC1h 55m
2026-07-10 UAL1012 EWR → ATL Jul 10, 10:19 UTCJul 10, 11:50 UTC1h 31m
2026-07-10 UAL1012 - Jul 10, 10:15 UTCJul 10, 11:55 UTC1h 40m
2026-07-10 UAL555 ATL → EWR Jul 10, 04:45 UTCJul 10, 06:35 UTC1h 50m
2026-07-10 UAL307K EWR → ATL Jul 10, 01:07 UTCJul 10, 02:55 UTC1h 48m
2026-07-10 UAL307K EWR → ATL Jul 10, 01:15 UTCJul 10, 03:00 UTC1h 45m
2026-07-09 UAL1365 - Jul 9, 16:30 UTCJul 9, 18:10 UTC1h 40m
2026-07-09 UAL1365 MYR → EWR Jul 9, 14:16 UTCJul 9, 18:04 UTC3h 48m
2026-07-09 UAL1407 - Jul 9, 11:25 UTCJul 9, 12:40 UTC1h 15m

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 N822UA page for operator, model, and routing details .

Mode-S AB3A0C frequently asked

What is Mode-S code AB3A0C?
AB3A0C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N822UA.
Where is Mode-S AB3A0C registered?
Mode-S code AB3A0C 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 AB3A0C broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB3A0C, octal 52635014, decimal 11,221,516.
What flights does AB3A0C operate?
Mode-S AB3A0C has broadcast 20 distinct callsigns, including UAL283, UAL285, UAL2279, UAL1535, UAL1439.