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
Transponder active on ground
Flights observed
110
Distinct callsigns
20
Country
US
Last broadcast
37m ago

Last known position

Most recent position reported by Mode-S AA441C.

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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 UAL58 SFO → FRA May 29, 21:15 UTCMay 30, 07:00 UTC9h 45m
2026-05-28 UAL889 PEK → SFO May 28, 10:45 UTCMay 28, 20:55 UTC10h 10m
2026-05-27 UAL888 SFO → PEK May 27, 18:25 UTCMay 28, 06:15 UTC11h 50m
2026-05-27 UAL673 SFO → BOS May 27, 00:00 UTCMay 27, 05:04 UTC5h 5m
2026-05-26 UAL673 SFO → BOS May 26, 14:35 UTCMay 26, 22:05 UTC7h 30m
2026-05-26 UAL672 EWR → ATL May 26, 01:24 UTCMay 26, 12:14 UTC10h 50m
2026-05-25 UAL1777 EWR → IAH May 25, 15:50 UTCMay 25, 21:04 UTC5h 15m
2026-05-25 UAL148 GRU → EWR May 25, 06:00 UTCMay 25, 09:15 UTC3h 15m
2026-05-24 UAL149 EWR → GRU May 24, 01:01 UTCMay 24, 10:02 UTC9h 1m
2026-05-24 UAL149 EWR → GRU May 24, 01:25 UTCMay 24, 03:00 UTC1h 35m
2026-05-23 UAL905 LHR → EWR May 23, 09:00 UTCMay 23, 16:05 UTC7h 5m
2026-05-23 UAL905 LHR → EWR May 23, 08:55 UTCMay 23, 16:01 UTC7h 6m
2026-05-22 UAL918 IAD → LHR May 22, 23:26 UTCMay 23, 05:38 UTC6h 12m
2026-05-22 UAL918 IAD → LHR May 22, 23:15 UTCMay 23, 05:00 UTC5h 44m
2026-05-22 UAL919 LHR → IAD May 22, 11:40 UTCMay 22, 19:00 UTC7h 20m
2026-05-22 UAL919 LHR → IAD May 22, 11:40 UTCMay 22, 18:53 UTC7h 13m
2026-05-21 UAL918 IAD → LHR May 21, 23:11 UTCMay 22, 05:49 UTC6h 38m
2026-05-21 UAL918 IAD → LHR May 21, 23:35 UTCMay 22, 05:55 UTC6h 20m
2026-05-21 UAL804 HND → IAD May 21, 07:15 UTCMay 21, 07:55 UTC40m
2026-05-21 UAL804 HND → IAD May 21, 07:15 UTCMay 21, 19:38 UTC12h 23m
2026-05-20 UAL875 SFO → HND May 20, 18:05 UTCMay 21, 05:04 UTC10h 59m
2026-05-20 UAL875 SFO → HND May 20, 18:15 UTCMay 20, 18:40 UTC25m
2026-05-20 UAL97 BNE → SFO May 20, 00:45 UTCMay 20, 12:50 UTC12h 6m
2026-05-19 UAL96 SFO → BNE May 19, 07:06 UTCMay 19, 20:16 UTC13h 10m
2026-05-19 UAL96 SFO → BNE May 19, 07:05 UTCMay 19, 20:20 UTC13h 15m
2026-05-18 UAL673 SFO → BOS May 18, 14:50 UTCMay 19, 02:25 UTC11h 34m
2026-05-18 UAL673 SFO → BOS May 18, 14:36 UTCMay 19, 02:20 UTC11h 44m
2026-05-18 UAL672 EWR → ATL May 18, 01:05 UTCMay 18, 11:45 UTC10h 40m
2026-05-17 UAL984 CDG → SFO May 17, 07:49 UTCMay 17, 17:51 UTC10h 2m
2026-05-17 UAL984 CDG → SFO May 17, 07:35 UTCMay 17, 17:01 UTC9h 26m
2026-05-16 UAL915 IAD → CDG May 16, 22:25 UTCMay 17, 05:20 UTC6h 55m
2026-05-16 UAL3933 PWM → MCO May 16, 15:50 UTCMay 16, 16:35 UTC45m
2026-05-16 UAL2480 BOS → SFO May 16, 03:15 UTCMay 16, 08:01 UTC4h 46m
2026-05-15 UAL2610 IAD → PDX May 15, 21:35 UTCMay 16, 01:30 UTC3h 55m
2026-05-15 UAL3918 EWR → SFO May 15, 16:15 UTCMay 15, 17:50 UTC1h 35m
2026-05-12 UAL804 HND → IAD May 12, 07:15 UTCMay 12, 19:15 UTC12h 0m
2026-05-11 UAL875 SFO → HND May 11, 18:00 UTCMay 12, 04:15 UTC10h 15m
2026-05-10 UAL927 FRA → SFO May 10, 16:20 UTCMay 11, 03:30 UTC11h 10m
2026-05-10 UAL926 SFO → FRA May 10, 02:34 UTCMay 10, 13:05 UTC10h 30m
2026-05-09 UAL969 AMS → SFO May 9, 13:45 UTCMay 10, 00:09 UTC10h 25m
2026-05-08 UAL968 SFO → AMS May 8, 22:35 UTCMay 9, 08:25 UTC9h 50m
2026-05-08 UAL876 HND → SFO May 8, 07:15 UTCMay 8, 16:00 UTC8h 45m
2026-05-08 UAL876 HND → SFO May 8, 07:09 UTCMay 8, 16:00 UTC8h 50m
2026-05-07 UAL131 EWR → HND May 7, 14:40 UTCMay 8, 04:29 UTC13h 49m
2026-05-07 UAL2397 EWR → PDX May 7, 04:15 UTCMay 7, 08:25 UTC4h 10m
2026-05-06 UAL2238 IAH → SFO May 6, 20:05 UTCMay 7, 01:20 UTC5h 15m
2026-05-06 UAL2397 EWR → PDX May 6, 06:00 UTCMay 6, 10:10 UTC4h 10m
2026-05-05 UAL2238 IAH → SFO May 5, 22:50 UTCMay 6, 04:20 UTC5h 30m
2026-05-05 UAL435 KOA → SFO May 5, 16:10 UTCMay 5, 20:45 UTC4h 35m
2026-05-03 UAL506 MSN → DEN May 3, 14:30 UTCMay 3, 17:10 UTC2h 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 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?
Mode-S AA441C is currently broadcasting from the ground.
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 UAL984, UAL506, UAL889, UAL888, UAL804.