Apparatus

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sensors Mode-S transponder

AAA4DC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N785UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
AAA4DC
Octal
52522334
Decimal
11,183,324
Country
US
Tail
N785UA
Type
B772
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
249
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S AAA4DC.

Country allocation

The ICAO 24-bit address AAA4DC 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
UAL969 - 15 2026-06-25
UAL968 - 11 2026-06-24
UAL18 - 10 2026-07-18
UAL984 - 9 2026-07-11
UAL59 - 8 2026-07-12
UAL19 - 7 2026-07-17
UAL932 United Airlines 6 2026-04-30
UAL672 - 6 2026-07-05
UAL58 - 6 2026-07-11
UAL506 - 6 2026-06-29
UAL930 United Airlines 5 2026-05-17
UAL925 United Airlines 5 2026-06-07
UAL888 United Airlines 5 2026-06-12
UAL35 United Airlines 5 2026-07-21
UAL23 - 5 2026-07-01
UAL943 United Airlines 4 2026-06-08
UAL927 United Airlines 4 2026-04-18
UAL900 United Airlines 4 2026-04-13
UAL889 United Airlines 4 2026-06-13
UAL884 United Airlines 4 2026-06-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL47 FRA → IAH Jul 26, 12:40 UTCJul 26, 23:00 UTC10h 20m
2026-07-25 UAL46 IAH → FRA Jul 25, 23:45 UTCJul 26, 09:00 UTC9h 16m
2026-07-24 UAL160 MUC → IAH Jul 24, 10:35 UTCJul 24, 21:00 UTC10h 25m
2026-07-24 UAL160 MUC → IAH Jul 24, 10:39 UTCJul 24, 21:00 UTC10h 21m
2026-07-23 UAL194 SFO → MUC Jul 23, 21:20 UTCJul 24, 07:35 UTC10h 15m
2026-07-23 UAL3046 TPA → EWR Jul 23, 17:05 UTCJul 23, 17:15 UTC10m
2026-07-23 UAL3046 TPA → EWR Jul 23, 11:25 UTCJul 23, 17:00 UTC5h 35m
2026-07-23 UAL3046 TPA → EWR Jul 23, 11:20 UTCJul 23, 16:50 UTC5h 30m
2026-07-22 UAL366 DEN → AUS Jul 22, 21:05 UTCJul 23, 01:45 UTC4h 40m
2026-07-22 UAL34 KIX → SFO Jul 22, 17:10 UTCJul 22, 18:00 UTC50m
2026-07-21 UAL35 SFO → KIX Jul 21, 19:20 UTCJul 21, 19:45 UTC25m
2026-07-21 UAL35 SFO → KIX Jul 21, 19:00 UTCJul 22, 05:50 UTC10h 50m
2026-07-20 UAL3012 HND → SFO Jul 20, 21:20 UTCJul 21, 02:30 UTC5h 9m
2026-07-20 UAL3045 EWR → SFO Jul 20, 08:40 UTCJul 20, 15:25 UTC6h 45m
2026-07-20 UAL3045 EWR → SFO Jul 20, 08:35 UTCJul 20, 15:24 UTC6h 49m
2026-07-19 UAL14 EWR → LHR Jul 19, 07:20 UTCJul 19, 13:50 UTC6h 30m
2026-07-18 UAL18 - Jul 18, 16:40 UTCJul 18, 17:00 UTC20m
2026-07-18 UAL18 - Jul 18, 16:15 UTCJul 18, 17:00 UTC45m
2026-07-18 UAL18 MXP → EWR Jul 18, 08:06 UTCJul 18, 15:59 UTC7h 53m
2026-07-18 UAL18 MXP → EWR Jul 18, 08:06 UTCJul 18, 16:23 UTC8h 17m
2026-07-18 UAL18 - Jul 18, 08:10 UTCJul 18, 10:25 UTC2h 15m
2026-07-17 UAL19 EWR → MXP Jul 17, 22:18 UTCJul 18, 06:11 UTC7h 53m
2026-07-17 UAL19 - Jul 17, 22:29 UTCJul 18, 00:00 UTC1h 30m
2026-07-17 UAL121 BCN → EWR Jul 17, 10:35 UTCJul 17, 18:19 UTC7h 45m
2026-07-16 UAL120 EWR → BCN Jul 16, 23:45 UTCJul 17, 06:53 UTC7h 8m
2026-07-16 UAL120 EWR → BCN Jul 16, 23:59 UTCJul 17, 06:54 UTC6h 55m
2026-07-16 UAL18 MXP → EWR Jul 16, 08:25 UTCJul 16, 16:25 UTC8h 0m
2026-07-15 UAL19 EWR → MXP Jul 15, 22:40 UTCJul 16, 06:15 UTC7h 35m
2026-07-15 UAL55 - Jul 15, 11:25 UTCJul 15, 18:55 UTC7h 30m
2026-07-15 UAL54 EWR → CDG Jul 15, 01:45 UTCJul 15, 08:35 UTC6h 50m
2026-07-14 UAL1173 - Jul 14, 12:20 UTCJul 14, 21:10 UTC8h 50m
2026-07-13 UAL366 SFO → EWR Jul 13, 21:42 UTCJul 14, 02:35 UTC4h 53m
2026-07-13 UAL366 SFO → EWR Jul 13, 21:45 UTCJul 14, 02:40 UTC4h 55m
2026-07-12 UAL59 FRA → SFO Jul 12, 11:24 UTCJul 12, 22:11 UTC10h 47m
2026-07-12 UAL59 - Jul 12, 11:15 UTCJul 12, 12:50 UTC1h 35m
2026-07-11 UAL58 SFO → FRA Jul 11, 21:25 UTCJul 12, 07:20 UTC9h 55m
2026-07-11 UAL984 - Jul 11, 07:30 UTCJul 11, 18:35 UTC11h 5m
2026-07-11 UAL984 CDG → SFO Jul 11, 07:39 UTCJul 11, 18:28 UTC10h 49m
2026-07-10 UAL57 - Jul 10, 23:00 UTCJul 11, 05:25 UTC6h 25m
2026-07-10 UAL31 - Jul 10, 08:00 UTCJul 10, 16:25 UTC8h 25m
2026-07-09 UAL30 - Jul 9, 22:10 UTCJul 10, 05:25 UTC7h 15m
2026-07-09 UAL905 LHR → EWR Jul 9, 08:55 UTCJul 9, 15:57 UTC7h 2m
2026-07-09 UAL905 LHR → EWR Jul 9, 08:55 UTCJul 9, 16:00 UTC7h 5m
2026-07-08 UAL918 IAD → LHR Jul 8, 22:50 UTCJul 9, 05:35 UTC6h 45m
2026-07-08 UAL914 CDG → IAD Jul 8, 10:45 UTCJul 8, 18:20 UTC7h 35m
2026-07-07 UAL990 SFO → CDG Jul 7, 22:00 UTCJul 8, 08:05 UTC10h 5m
2026-07-07 UAL34 - Jul 7, 08:10 UTCJul 7, 17:55 UTC9h 45m
2026-07-06 UAL35 SFO → KIX Jul 6, 18:42 UTCJul 7, 05:31 UTC10h 49m
2026-07-06 UAL35 - Jul 6, 18:40 UTCJul 6, 23:55 UTC5h 15m
2026-07-05 UAL673 - Jul 5, 14:30 UTCJul 6, 02:10 UTC11h 40m

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 N785UA page for operator, model, and routing details .

Mode-S AAA4DC frequently asked

What is Mode-S code AAA4DC?
AAA4DC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N785UA.
Where is Mode-S AAA4DC registered?
Mode-S code AAA4DC 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 AAA4DC broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AAA4DC, octal 52522334, decimal 11,183,324.
What flights does AAA4DC operate?
Mode-S AAA4DC has broadcast 20 distinct callsigns, including UAL969, UAL968, UAL18, UAL984, UAL59.