Apparatus

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sensors Mode-S transponder

AAB001

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N788UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
AAB001
Octal
52530001
Decimal
11,186,177
Country
US
Tail
N788UA
Type
B772
Broadcasting now · callsign UAL852 · 10,950 ft
Flights observed
223
Distinct callsigns
20
Country
US
Last broadcast
8h ago

Current position

AAB001 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AAB001 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
UAL990 - 15 2026-06-29
UAL818 United Airlines 9 2026-05-04
UAL195 United Airlines 9 2026-06-13
UAL18 United Airlines 9 2026-06-02
UAL880 United Airlines 8 2026-06-20
UAL879 - 7 2026-06-20
UAL819 United Airlines 7 2026-05-03
UAL71 - 7 2026-07-09
UAL102 - 7 2026-06-12
UAL948 United Airlines 6 2026-04-27
UAL914 United Airlines 6 2026-06-30
UAL70 - 6 2026-07-08
UAL57 United Airlines 6 2026-06-17
UAL23 - 6 2026-07-10
UAL19 United Airlines 6 2026-06-01
UAL984 - 5 2026-06-18
UAL56 United Airlines 5 2026-06-17
UAL22 - 5 2026-07-10
UAL968 United Airlines 4 2026-06-08
UAL915 - 4 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL852 TPE → SFO Jul 14, 06:51 UTCJul 14, 18:28 UTC11h 37m
2026-07-14 UAL852 - Jul 14, 06:45 UTCJul 14, 09:40 UTC2h 55m
2026-07-13 UAL853 SFO → TPE Jul 13, 07:55 UTCJul 13, 20:00 UTC12h 5m
2026-07-12 UAL506 - Jul 12, 14:40 UTCJul 13, 03:01 UTC12h 20m
2026-07-12 UAL507 - Jul 12, 00:25 UTCJul 12, 11:40 UTC11h 15m
2026-07-10 UAL2328 EWR → SFO Jul 10, 19:45 UTCJul 11, 01:25 UTC5h 40m
2026-07-10 UAL22 DUB → EWR Jul 10, 08:35 UTCJul 10, 15:20 UTC6h 45m
2026-07-10 UAL23 EWR → DUB Jul 10, 00:55 UTCJul 10, 06:05 UTC5h 10m
2026-07-10 UAL23 - Jul 10, 00:40 UTCJul 10, 06:15 UTC5h 35m
2026-07-09 UAL71 - Jul 9, 07:35 UTCJul 9, 14:15 UTC6h 40m
2026-07-09 UAL71 AMS → EWR Jul 9, 07:27 UTCJul 9, 15:00 UTC7h 33m
2026-07-08 UAL70 EWR → AMS Jul 8, 22:28 UTCJul 9, 04:56 UTC6h 28m
2026-07-08 UAL70 - Jul 8, 22:35 UTCJul 9, 04:15 UTC5h 40m
2026-07-06 UAL31 - Jul 6, 08:05 UTCJul 6, 16:30 UTC8h 25m
2026-07-05 UAL30 - Jul 5, 22:20 UTCJul 6, 05:05 UTC6h 45m
2026-07-05 UAL1141 SFO → EWR Jul 5, 05:50 UTCJul 5, 10:30 UTC4h 40m
2026-07-04 UAL1336 - Jul 4, 15:40 UTCJul 4, 20:55 UTC5h 15m
2026-07-04 UAL148 - Jul 4, 01:40 UTCJul 4, 10:25 UTC8h 45m
2026-07-04 UAL148 GRU → EWR Jul 4, 01:28 UTCJul 4, 10:23 UTC8h 55m
2026-07-03 UAL149 - Jul 3, 01:15 UTCJul 3, 10:00 UTC8h 45m
2026-07-03 UAL149 EWR → GRU Jul 3, 01:05 UTCJul 3, 09:53 UTC8h 48m
2026-07-02 UAL130 HND → EWR Jul 2, 09:10 UTCJul 2, 21:25 UTC12h 15m
2026-07-01 UAL803 IAD → HND Jul 1, 17:30 UTCJul 2, 06:41 UTC13h 11m
2026-06-30 UAL914 CDG → IAD Jun 30, 11:30 UTCJun 30, 19:05 UTC7h 35m
2026-06-29 UAL990 SFO → CDG Jun 29, 22:15 UTCJun 30, 08:30 UTC10h 16m
2026-06-28 UAL34 - Jun 28, 08:19 UTCJun 28, 09:20 UTC1h 0m
2026-06-28 UAL34 KIX → SFO Jun 28, 08:15 UTCJun 28, 17:32 UTC9h 17m
2026-06-27 UAL35 SFO → KIX Jun 27, 18:35 UTCJun 28, 05:34 UTC10h 59m
2026-06-27 UAL35 SFO → KIX Jun 27, 18:35 UTCJun 28, 05:40 UTC11h 5m
2026-06-26 UAL876 HND → SFO Jun 26, 07:20 UTCJun 26, 17:15 UTC9h 55m
2026-06-25 UAL131 EWR → HND Jun 25, 14:53 UTCJun 26, 04:06 UTC13h 13m
2026-06-25 UAL131 EWR → HND Jun 25, 14:50 UTCJun 26, 04:10 UTC13h 20m
2026-06-25 UAL148 - Jun 25, 00:29 UTCJun 25, 09:34 UTC9h 5m
2026-06-24 UAL149 - Jun 24, 01:19 UTCJun 24, 10:39 UTC9h 20m
2026-06-23 UAL130 - Jun 23, 09:14 UTCJun 23, 21:34 UTC12h 20m
2026-06-22 UAL803 IAD → HND Jun 22, 17:44 UTCJun 23, 06:44 UTC13h 0m
2026-06-21 UAL919 - Jun 21, 11:44 UTCJun 21, 19:00 UTC7h 15m
2026-06-20 UAL880 IAH → LHR Jun 20, 22:00 UTCJun 21, 06:35 UTC8h 35m
2026-06-20 UAL880 IAH → LHR Jun 20, 21:57 UTCJun 21, 06:23 UTC8h 26m
2026-06-20 UAL879 - Jun 20, 09:24 UTCJun 20, 19:04 UTC9h 40m
2026-06-19 UAL918 IAD → LHR Jun 19, 22:56 UTCJun 20, 05:18 UTC6h 22m
2026-06-19 UAL918 - Jun 19, 22:55 UTCJun 20, 00:29 UTC1h 35m
2026-06-19 UAL914 CDG → IAD Jun 19, 11:09 UTCJun 19, 19:04 UTC7h 55m
2026-06-18 UAL990 SFO → CDG Jun 18, 22:33 UTCJun 19, 08:30 UTC9h 57m
2026-06-18 UAL990 SFO → CDG Jun 18, 22:30 UTCJun 19, 08:34 UTC10h 4m
2026-06-18 UAL984 - Jun 18, 08:25 UTCJun 18, 10:05 UTC1h 40m
2026-06-18 UAL984 CDG → SFO Jun 18, 08:24 UTCJun 18, 18:50 UTC10h 26m
2026-06-18 UAL984 CDG → SFO Jun 18, 08:24 UTCJun 18, 18:42 UTC10h 18m
2026-06-17 UAL57 EWR → CDG Jun 17, 23:43 UTCJun 18, 06:16 UTC6h 33m
2026-06-17 UAL57 EWR → CDG Jun 17, 23:40 UTCJun 18, 06:15 UTC6h 35m

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 N788UA page for operator, model, and routing details .

Mode-S AAB001 frequently asked

What is Mode-S code AAB001?
AAB001 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N788UA.
Where is Mode-S AAB001 registered?
Mode-S code AAB001 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 AAB001 broadcasting right now?
Yes. Mode-S AAB001 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AAB001, octal 52530001, decimal 11,186,177.
What flights does AAB001 operate?
Mode-S AAB001 has broadcast 20 distinct callsigns, including UAL990, UAL818, UAL195, UAL18, UAL880.