Apparatus

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sensors Mode-S transponder

AAC4ED

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N793UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
AAC4ED
Octal
52542355
Decimal
11,191,533
Country
US
Tail
N793UA
Type
B772
No current signal · last broadcast Jul 25, 22:25 UTC
Flights observed
248
Distinct callsigns
20
Country
US
Last broadcast
Jul 25, 22:25 UTC

Last known position

Most recent position reported by Mode-S AAC4ED.

Country allocation

The ICAO 24-bit address AAC4ED 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
UAL34 United Airlines 14 2026-07-24
UAL35 United Airlines 11 2026-07-23
UAL160 - 10 2026-07-11
UAL852 United Airlines 9 2026-07-22
UAL194 - 9 2026-07-10
UAL905 - 8 2026-06-15
UAL59 United Airlines 8 2026-07-25
UAL46 - 8 2026-07-16
UAL880 United Airlines 7 2026-06-25
UAL853 United Airlines 7 2026-07-21
UAL58 United Airlines 7 2026-07-24
UAL102 United Airlines 7 2026-05-09
UAL984 - 6 2026-06-19
UAL57 United Airlines 6 2026-06-18
UAL990 United Airlines 5 2026-05-20
UAL884 - 5 2026-06-26
UAL879 - 5 2026-06-25
UAL45 United Airlines 5 2026-06-30
UAL19 - 5 2026-06-17
UAL18 - 5 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 UAL59 FRA → SFO Jul 25, 11:15 UTCJul 25, 22:15 UTC11h 0m
2026-07-24 UAL58 SFO → FRA Jul 24, 21:30 UTCJul 25, 07:30 UTC10h 0m
2026-07-24 UAL34 KIX → SFO Jul 24, 08:15 UTCJul 24, 18:10 UTC9h 55m
2026-07-23 UAL35 SFO → KIX Jul 23, 19:40 UTCJul 24, 05:47 UTC10h 7m
2026-07-23 UAL35 SFO → KIX Jul 23, 19:40 UTCJul 24, 05:55 UTC10h 15m
2026-07-22 UAL852 TPE → SAN Jul 22, 17:30 UTCJul 22, 18:15 UTC45m
2026-07-21 UAL853 SFO → TPE Jul 21, 20:05 UTCJul 21, 20:20 UTC15m
2026-07-21 UAL853 SFO → TPE Jul 21, 08:10 UTCJul 21, 18:45 UTC10h 35m
2026-07-20 UAL673 SFO → BOS Jul 20, 14:30 UTCJul 20, 15:15 UTC45m
2026-07-20 UAL673 SFO → BOS Jul 20, 14:31 UTCJul 21, 02:02 UTC11h 31m
2026-07-20 UAL672 SFO → BCN Jul 20, 01:29 UTCJul 20, 11:46 UTC10h 17m
2026-07-20 UAL672 SFO → BCN Jul 20, 01:15 UTCJul 20, 11:55 UTC10h 40m
2026-07-19 UAL59 - Jul 19, 11:20 UTCJul 19, 22:30 UTC11h 10m
2026-07-19 UAL59 FRA → SFO Jul 19, 11:24 UTCJul 19, 22:23 UTC10h 59m
2026-07-18 UAL58 SFO → FRA Jul 18, 21:47 UTCJul 19, 07:46 UTC9h 59m
2026-07-18 UAL58 SFO → FRA Jul 18, 21:50 UTCJul 19, 07:55 UTC10h 5m
2026-07-18 UAL852 TPE → SAN Jul 18, 08:50 UTCJul 18, 09:15 UTC25m
2026-07-18 UAL852 TPE → SAN Jul 18, 06:55 UTCJul 18, 07:10 UTC15m
2026-07-18 UAL852 TPE → SAN Jul 18, 06:51 UTCJul 18, 18:43 UTC11h 52m
2026-07-17 UAL853 - Jul 17, 19:35 UTCJul 17, 20:00 UTC25m
2026-07-17 UAL853 SFO → TPE Jul 17, 07:43 UTCJul 17, 19:57 UTC12h 14m
2026-07-17 UAL853 - Jul 17, 07:55 UTCJul 17, 18:29 UTC10h 35m
2026-07-16 UAL927 - Jul 16, 15:55 UTCJul 17, 03:14 UTC11h 20m
2026-07-16 UAL46 - Jul 16, 07:25 UTCJul 16, 09:25 UTC2h 0m
2026-07-15 UAL46 - Jul 15, 23:55 UTCJul 16, 03:40 UTC3h 45m
2026-07-14 UAL4 - Jul 14, 13:05 UTCJul 14, 22:40 UTC9h 35m
2026-07-14 UAL924 IAD → LHR Jul 14, 02:45 UTCJul 14, 09:55 UTC7h 10m
2026-07-14 UAL924 IAD → LHR Jul 14, 02:33 UTCJul 14, 09:49 UTC7h 16m
2026-07-13 UAL943 LIS → IAD Jul 13, 11:50 UTCJul 13, 19:00 UTC7h 10m
2026-07-13 UAL942 IAD → LIS Jul 13, 03:15 UTCJul 13, 09:45 UTC6h 30m
2026-07-12 UAL925 - Jul 12, 16:35 UTCJul 12, 23:45 UTC7h 10m
2026-07-12 UAL5 - Jul 12, 02:01 UTCJul 12, 11:20 UTC9h 20m
2026-07-11 UAL160 - Jul 11, 11:25 UTCJul 11, 22:01 UTC10h 35m
2026-07-10 UAL194 SFO → MUC Jul 10, 21:40 UTCJul 11, 08:05 UTC10h 25m
2026-07-10 UAL852 - Jul 10, 08:40 UTCJul 10, 18:20 UTC9h 40m
2026-07-10 UAL852 - Jul 10, 06:50 UTCJul 10, 07:10 UTC20m
2026-07-10 UAL852 TPE → SFO Jul 10, 06:51 UTCJul 10, 18:10 UTC11h 19m
2026-07-09 UAL853 - Jul 9, 07:20 UTCJul 9, 19:55 UTC12h 35m
2026-07-05 UAL59 - Jul 5, 12:10 UTCJul 5, 23:20 UTC11h 10m
2026-07-04 UAL58 SFO → FRA Jul 4, 21:22 UTCJul 5, 07:34 UTC10h 12m
2026-07-04 UAL58 - Jul 4, 21:25 UTCJul 5, 01:45 UTC4h 20m
2026-07-04 UAL34 KIX → SFO Jul 4, 08:15 UTCJul 4, 17:49 UTC9h 34m
2026-07-04 UAL34 - Jul 4, 08:10 UTCJul 4, 09:15 UTC1h 5m
2026-07-03 UAL35 SFO → KIX Jul 3, 18:35 UTCJul 4, 05:30 UTC10h 55m
2026-07-01 UAL927 FRA → SFO Jul 1, 15:51 UTCJul 2, 02:42 UTC10h 51m
2026-07-01 UAL926 SFO → FRA Jul 1, 02:45 UTCJul 1, 12:55 UTC10h 10m
2026-06-30 UAL45 ZRH → SFO Jun 30, 12:22 UTCJun 30, 23:38 UTC11h 16m
2026-06-30 UAL45 ZRH → SFO Jun 30, 12:22 UTCJun 30, 23:37 UTC11h 15m
2026-06-30 UAL45 ZRH → SFO Jun 30, 12:30 UTCJun 30, 14:35 UTC2h 5m
2026-06-29 UAL44 SFO → ZRH Jun 29, 21:50 UTCJun 30, 08:20 UTC10h 30m

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 N793UA page for operator, model, and routing details .

Mode-S AAC4ED frequently asked

What is Mode-S code AAC4ED?
AAC4ED is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N793UA.
Where is Mode-S AAC4ED registered?
Mode-S code AAC4ED 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 AAC4ED broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 22:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AAC4ED, octal 52542355, decimal 11,191,533.
What flights does AAC4ED operate?
Mode-S AAC4ED has broadcast 20 distinct callsigns, including UAL34, UAL35, UAL160, UAL852, UAL194.