Apparatus

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sensors Mode-S transponder

A1AA10

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N206UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
A1AA10
Octal
50325020
Decimal
10,594,832
Country
US
Tail
N206UA
Type
B772
No current signal · last broadcast Jul 26, 21:50 UTC
Flights observed
256
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:50 UTC

Last known position

Most recent position reported by Mode-S A1AA10.

Country allocation

The ICAO 24-bit address A1AA10 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
UAL914 United Airlines 13 2026-06-27
UAL990 - 10 2026-06-26
UAL885 - 8 2026-06-29
UAL884 - 8 2026-06-28
UAL818 - 8 2026-06-16
UAL58 - 8 2026-07-09
UAL932 - 7 2026-06-25
UAL915 - 7 2026-06-29
UAL880 United Airlines 7 2026-07-23
UAL56 United Airlines 7 2026-06-30
UAL160 United Airlines 7 2026-07-18
UAL984 United Airlines 6 2026-07-25
UAL905 United Airlines 6 2026-07-24
UAL59 - 6 2026-07-10
UAL195 United Airlines 6 2026-07-26
UAL194 United Airlines 6 2026-07-25
UAL149 - 6 2026-07-02
UAL927 - 5 2026-06-25
UAL673 - 5 2026-07-06
UAL57 United Airlines 5 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL195 MUC → SFO Jul 26, 10:15 UTCJul 26, 21:30 UTC11h 15m
2026-07-25 UAL194 SFO → MUC Jul 25, 21:45 UTCJul 26, 07:45 UTC10h 1m
2026-07-25 UAL984 CDG → SFO Jul 25, 18:45 UTCJul 25, 18:50 UTC5m
2026-07-25 UAL984 CDG → SFO Jul 25, 07:50 UTCJul 25, 09:40 UTC1h 50m
2026-07-25 UAL984 CDG → SFO Jul 25, 07:39 UTCJul 25, 18:27 UTC10h 48m
2026-07-25 UAL984 CDG → SFO Jul 25, 07:39 UTCJul 25, 18:37 UTC10h 58m
2026-07-24 UAL57 EWR → CDG Jul 24, 22:33 UTCJul 25, 04:45 UTC6h 12m
2026-07-24 UAL57 EWR → CDG Jul 24, 22:25 UTCJul 25, 04:50 UTC6h 25m
2026-07-24 UAL905 LHR → EWR Jul 24, 09:10 UTCJul 24, 10:25 UTC1h 15m
2026-07-24 UAL905 LHR → EWR Jul 24, 09:15 UTCJul 24, 16:00 UTC6h 45m
2026-07-23 UAL880 IAH → LHR Jul 23, 21:55 UTCJul 24, 06:00 UTC8h 5m
2026-07-23 UAL880 IAH → LHR Jul 23, 21:57 UTCJul 24, 06:33 UTC8h 36m
2026-07-23 UAL879 LHR → IAH Jul 23, 09:35 UTCJul 23, 18:50 UTC9h 15m
2026-07-23 UAL879 LHR → IAH Jul 23, 09:25 UTCJul 23, 18:51 UTC9h 26m
2026-07-22 UAL880 IAH → LHR Jul 22, 22:00 UTCJul 23, 06:35 UTC8h 35m
2026-07-18 UAL160 MUC → IAH Jul 18, 11:20 UTCJul 18, 21:50 UTC10h 30m
2026-07-17 UAL194 SFO → MUC Jul 17, 21:39 UTCJul 18, 07:55 UTC10h 16m
2026-07-17 UAL2328 - Jul 17, 00:40 UTCJul 17, 00:45 UTC5m
2026-07-16 UAL2328 EWR → SFO Jul 16, 19:10 UTCJul 17, 00:24 UTC5h 14m
2026-07-16 UAL2328 - Jul 16, 19:05 UTCJul 16, 23:59 UTC4h 55m
2026-07-16 UAL71 - Jul 16, 08:30 UTCJul 16, 15:35 UTC7h 5m
2026-07-15 UAL70 EWR → AMS Jul 15, 23:13 UTCJul 16, 05:59 UTC6h 46m
2026-07-15 UAL70 EWR → AMS Jul 15, 23:35 UTCJul 16, 06:10 UTC6h 35m
2026-07-15 UAL71 - Jul 15, 10:30 UTCJul 15, 17:50 UTC7h 20m
2026-07-14 UAL70 EWR → AMS Jul 14, 22:15 UTCJul 15, 04:55 UTC6h 39m
2026-07-14 UAL18 MXP → EWR Jul 14, 08:10 UTCJul 14, 16:00 UTC7h 50m
2026-07-13 UAL19 EWR → MXP Jul 13, 22:05 UTCJul 14, 05:20 UTC7h 15m
2026-07-13 UAL121 - Jul 13, 11:30 UTCJul 13, 12:00 UTC30m
2026-07-13 UAL121 BCN → EWR Jul 13, 10:37 UTCJul 13, 19:18 UTC8h 41m
2026-07-13 UAL120 - Jul 13, 00:30 UTCJul 13, 07:25 UTC6h 55m
2026-07-12 UAL905 - Jul 12, 16:45 UTCJul 12, 16:50 UTC5m
2026-07-12 UAL905 - Jul 12, 09:45 UTCJul 12, 11:01 UTC1h 15m
2026-07-12 UAL905 LHR → EWR Jul 12, 08:55 UTCJul 12, 16:28 UTC7h 33m
2026-07-12 UAL905 LHR → EWR Jul 12, 08:55 UTCJul 12, 16:52 UTC7h 57m
2026-07-11 UAL14 EWR → LHR Jul 11, 23:30 UTCJul 12, 05:50 UTC6h 20m
2026-07-11 UAL1141 SFO → EWR Jul 11, 06:20 UTCJul 11, 10:50 UTC4h 30m
2026-07-10 UAL59 - Jul 10, 11:15 UTCJul 10, 22:10 UTC10h 55m
2026-07-09 UAL58 SFO → FRA Jul 9, 21:22 UTCJul 10, 07:21 UTC9h 59m
2026-07-09 UAL58 SFO → FRA Jul 9, 21:25 UTCJul 10, 07:35 UTC10h 10m
2026-07-09 UAL876 - Jul 9, 07:10 UTCJul 9, 16:50 UTC9h 40m
2026-07-08 UAL131 EWR → HND Jul 8, 15:15 UTCJul 9, 04:40 UTC13h 25m
2026-07-07 UAL1333 - Jul 7, 21:10 UTCJul 8, 01:50 UTC4h 40m
2026-07-07 UAL1593 - Jul 7, 14:05 UTCJul 7, 19:15 UTC5h 10m
2026-07-07 UAL1141 - Jul 7, 06:45 UTCJul 7, 11:30 UTC4h 45m
2026-07-06 UAL673 BCN → SFO Jul 6, 14:51 UTCJul 7, 02:23 UTC11h 32m
2026-07-06 UAL673 - Jul 6, 14:45 UTCJul 7, 02:30 UTC11h 45m
2026-07-06 UAL672 SFO → BCN Jul 6, 01:30 UTCJul 6, 12:00 UTC10h 30m
2026-07-05 UAL889 PEK → SFO Jul 5, 11:30 UTCJul 5, 21:25 UTC9h 55m
2026-07-04 UAL888 SFO → PEK Jul 4, 18:15 UTCJul 5, 07:01 UTC12h 46m
2026-07-04 UAL888 SFO → PEK Jul 4, 18:15 UTCJul 5, 05:55 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 N206UA page for operator, model, and routing details .

Mode-S A1AA10 frequently asked

What is Mode-S code A1AA10?
A1AA10 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N206UA.
Where is Mode-S A1AA10 registered?
Mode-S code A1AA10 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 A1AA10 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1AA10, octal 50325020, decimal 10,594,832.
What flights does A1AA10 operate?
Mode-S A1AA10 has broadcast 20 distinct callsigns, including UAL914, UAL990, UAL885, UAL884, UAL818.