Apparatus

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sensors Mode-S transponder

AA441C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N76010 · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
AA441C
Octal
52442034
Decimal
11,158,556
Country
US
Tail
N76010
Type
B772
Broadcasting now · callsign UAL160 · 36,000 ft
Flights observed
207
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

AA441C is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AA441C 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
UAL673 - 10 2026-07-09
UAL943 United Airlines 8 2026-06-25
UAL984 United Airlines 7 2026-05-17
UAL918 United Airlines 7 2026-06-03
UAL888 - 7 2026-07-10
UAL506 United Airlines 7 2026-05-03
UAL942 - 6 2026-06-25
UAL889 - 6 2026-07-11
UAL875 - 6 2026-06-16
UAL804 - 6 2026-06-17
UAL884 - 5 2026-06-29
UAL672 - 5 2026-07-09
UAL58 United Airlines 5 2026-05-29
UAL507 United Airlines 5 2026-05-03
UAL919 - 4 2026-06-29
UAL885 - 4 2026-06-30
UAL876 - 4 2026-07-05
UAL853 - 4 2026-07-06
UAL1726 United Airlines 4 2026-04-14
UAL97 - 3 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL160 - Jul 14, 10:55 UTCJul 14, 19:00 UTC8h 5m
2026-07-13 UAL194 SFO → MUC Jul 13, 21:36 UTCJul 14, 07:49 UTC10h 13m
2026-07-13 UAL194 - Jul 13, 21:40 UTCJul 14, 07:50 UTC10h 10m
2026-07-13 UAL34 - Jul 13, 08:05 UTCJul 13, 17:55 UTC9h 50m
2026-07-12 UAL35 SFO → KIX Jul 12, 18:35 UTCJul 13, 05:22 UTC10h 47m
2026-07-12 UAL35 SFO → KIX Jul 12, 18:40 UTCJul 13, 05:20 UTC10h 40m
2026-07-11 UAL889 - Jul 11, 03:30 UTCJul 11, 22:20 UTC18h 50m
2026-07-10 UAL888 SFO → PEK Jul 10, 18:15 UTCJul 11, 06:57 UTC12h 42m
2026-07-10 UAL888 - Jul 10, 18:15 UTCJul 11, 13:50 UTC19h 35m
2026-07-09 UAL673 BCN → SFO Jul 9, 14:31 UTCJul 10, 01:59 UTC11h 28m
2026-07-09 UAL673 BCN → SFO Jul 9, 14:31 UTCJul 10, 01:56 UTC11h 25m
2026-07-09 UAL673 - Jul 9, 14:30 UTCJul 9, 17:55 UTC3h 25m
2026-07-09 UAL672 SFO → BCN Jul 9, 01:30 UTCJul 9, 12:10 UTC10h 40m
2026-07-08 UAL45 - Jul 8, 12:10 UTCJul 8, 23:20 UTC11h 10m
2026-07-07 UAL44 SFO → ZRH Jul 7, 22:10 UTCJul 8, 08:35 UTC10h 25m
2026-07-07 UAL852 - Jul 7, 07:00 UTCJul 7, 18:25 UTC11h 25m
2026-07-06 UAL853 SFO → TPE Jul 6, 07:37 UTCJul 6, 20:11 UTC12h 34m
2026-07-06 UAL853 SFO → TPE Jul 6, 07:40 UTCJul 6, 20:15 UTC12h 35m
2026-07-05 UAL876 HND → SFO Jul 5, 08:30 UTCJul 5, 17:49 UTC9h 19m
2026-07-05 UAL876 HND → SFO Jul 5, 08:50 UTCJul 5, 17:50 UTC9h 0m
2026-07-04 UAL131 - Jul 4, 17:55 UTCJul 5, 06:25 UTC12h 30m
2026-07-03 UAL121 BCN → EWR Jul 3, 10:45 UTCJul 3, 18:30 UTC7h 45m
2026-07-03 UAL120 - Jul 3, 01:00 UTCJul 3, 08:15 UTC7h 15m
2026-07-02 UAL22 DUB → EWR Jul 2, 08:45 UTCJul 2, 15:25 UTC6h 40m
2026-07-02 UAL23 EWR → DUB Jul 2, 00:15 UTCJul 2, 05:55 UTC5h 40m
2026-07-02 UAL23 EWR → DUB Jul 2, 00:25 UTCJul 2, 06:15 UTC5h 50m
2026-07-01 UAL56 CDG → EWR Jul 1, 08:10 UTCJul 1, 15:40 UTC7h 30m
2026-06-30 UAL915 IAD → CDG Jun 30, 22:25 UTCJul 1, 05:30 UTC7h 5m
2026-06-30 UAL885 - Jun 30, 09:00 UTCJun 30, 17:55 UTC8h 55m
2026-06-29 UAL884 IAD → FCO Jun 29, 21:58 UTCJun 30, 05:56 UTC7h 58m
2026-06-29 UAL884 IAD → FCO Jun 29, 22:05 UTCJun 30, 05:55 UTC7h 50m
2026-06-29 UAL919 - Jun 29, 11:35 UTCJun 29, 19:00 UTC7h 25m
2026-06-28 UAL14 EWR → LHR Jun 28, 23:45 UTCJun 29, 05:45 UTC6h 0m
2026-06-28 UAL14 - Jun 28, 23:29 UTCJun 29, 05:00 UTC5h 30m
2026-06-28 UAL55 - Jun 28, 11:29 UTCJun 28, 18:55 UTC7h 25m
2026-06-28 UAL54 EWR → CDG Jun 28, 02:05 UTCJun 28, 08:29 UTC6h 25m
2026-06-27 UAL130 HND → EWR Jun 27, 09:15 UTCJun 27, 21:25 UTC12h 10m
2026-06-26 UAL803 IAD → HND Jun 26, 17:10 UTCJun 27, 06:39 UTC13h 29m
2026-06-26 UAL803 IAD → HND Jun 26, 17:09 UTCJun 27, 00:10 UTC7h 0m
2026-06-25 UAL943 LIS → IAD Jun 25, 11:44 UTCJun 25, 19:05 UTC7h 20m
2026-06-25 UAL942 IAD → LIS Jun 25, 02:54 UTCJun 25, 09:29 UTC6h 35m
2026-06-24 UAL943 LIS → IAD Jun 24, 11:46 UTCJun 24, 19:06 UTC7h 20m
2026-06-24 UAL943 LIS → IAD Jun 24, 11:39 UTCJun 24, 19:10 UTC7h 30m
2026-06-24 UAL942 IAD → LIS Jun 24, 02:43 UTCJun 24, 09:38 UTC6h 55m
2026-06-23 UAL925 - Jun 23, 16:14 UTCJun 23, 23:59 UTC7h 45m
2026-06-23 UAL924 IAD → LHR Jun 23, 02:40 UTCJun 23, 09:24 UTC6h 45m
2026-06-22 UAL885 - Jun 22, 08:40 UTCJun 22, 17:40 UTC9h 0m
2026-06-22 UAL885 FCO → IAD Jun 22, 08:47 UTCJun 22, 17:36 UTC8h 49m
2026-06-21 UAL884 IAD → FCO Jun 21, 22:15 UTCJun 22, 06:35 UTC8h 20m
2026-06-21 UAL943 LIS → IAD Jun 21, 11:40 UTCJun 21, 19:05 UTC7h 25m

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 N76010 page for operator, model, and routing details .

Mode-S AA441C frequently asked

What is Mode-S code AA441C?
AA441C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N76010.
Where is Mode-S AA441C registered?
Mode-S code AA441C 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 AA441C broadcasting right now?
Yes. Mode-S AA441C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA441C, octal 52442034, decimal 11,158,556.
What flights does AA441C operate?
Mode-S AA441C has broadcast 20 distinct callsigns, including UAL673, UAL943, UAL984, UAL918, UAL888.