Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A1F90E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N226UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
A1F90E
Octal
50374416
Decimal
10,615,054
Country
US
Tail
N226UA
Type
B772
No current signal · last broadcast Jul 26, 18:50 UTC
Flights observed
260
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:50 UTC

Last known position

Most recent position reported by Mode-S A1F90E.

Country allocation

The ICAO 24-bit address A1F90E 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
UAL35 - 19 2026-07-11
UAL34 - 18 2026-07-12
UAL18 United Airlines 11 2026-07-23
UAL918 - 10 2026-06-28
UAL914 United Airlines 10 2026-07-03
UAL19 United Airlines 10 2026-07-22
UAL853 United Airlines 9 2026-05-25
UAL990 - 7 2026-07-02
UAL919 - 7 2026-06-28
UAL70 United Airlines 6 2026-04-29
UAL41 United Airlines 6 2026-04-27
UAL2004 United Airlines 6 2026-04-17
UAL984 United Airlines 5 2026-07-26
UAL969 United Airlines 5 2026-05-23
UAL884 - 5 2026-07-03
UAL71 United Airlines 5 2026-04-30
UAL57 United Airlines 5 2026-07-25
UAL195 United Airlines 5 2026-06-30
UAL121 United Airlines 5 2026-07-24
UAL968 United Airlines 4 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL984 CDG → SFO Jul 26, 07:35 UTCJul 26, 18:30 UTC10h 55m
2026-07-25 UAL57 EWR → CDG Jul 25, 22:25 UTCJul 26, 04:34 UTC6h 9m
2026-07-25 UAL57 EWR → CDG Jul 25, 22:00 UTCJul 25, 22:05 UTC5m
2026-07-25 UAL55 CDG → EWR Jul 25, 11:20 UTCJul 25, 18:40 UTC7h 20m
2026-07-25 UAL54 EWR → CDG Jul 25, 02:45 UTCJul 25, 09:10 UTC6h 25m
2026-07-24 UAL121 BCN → EWR Jul 24, 11:17 UTCJul 24, 19:01 UTC7h 44m
2026-07-24 UAL121 BCN → EWR Jul 24, 11:15 UTCJul 24, 19:05 UTC7h 50m
2026-07-24 UAL120 EWR → BCN Jul 24, 01:35 UTCJul 24, 08:30 UTC6h 55m
2026-07-23 UAL18 MXP → EWR Jul 23, 08:06 UTCJul 23, 15:43 UTC7h 37m
2026-07-23 UAL18 MXP → EWR Jul 23, 07:50 UTCJul 23, 15:55 UTC8h 5m
2026-07-22 UAL19 EWR → MXP Jul 22, 22:12 UTCJul 23, 05:10 UTC6h 58m
2026-07-22 UAL19 EWR → MXP Jul 22, 22:00 UTCJul 23, 05:15 UTC7h 15m
2026-07-22 UAL18 MXP → EWR Jul 22, 10:20 UTCJul 22, 16:05 UTC5h 45m
2026-07-21 UAL19 EWR → MXP Jul 21, 22:28 UTCJul 22, 05:46 UTC7h 18m
2026-07-21 UAL19 EWR → MXP Jul 21, 22:30 UTCJul 21, 23:55 UTC1h 25m
2026-07-21 UAL22 DUB → EWR Jul 21, 08:55 UTCJul 21, 09:30 UTC35m
2026-07-21 UAL22 DUB → EWR Jul 21, 08:50 UTCJul 21, 15:31 UTC6h 41m
2026-07-21 UAL22 DUB → EWR Jul 21, 08:50 UTCJul 21, 15:31 UTC6h 41m
2026-07-21 UAL23 EWR → DUB Jul 21, 01:00 UTCJul 21, 06:40 UTC5h 40m
2026-07-20 UAL55 - Jul 20, 11:55 UTCJul 20, 19:05 UTC7h 10m
2026-07-20 UAL54 EWR → CDG Jul 20, 03:15 UTCJul 20, 09:50 UTC6h 35m
2026-07-19 UAL121 BCN → EWR Jul 19, 14:55 UTCJul 19, 22:30 UTC7h 35m
2026-07-19 UAL120 EWR → BCN Jul 19, 05:45 UTCJul 19, 12:40 UTC6h 55m
2026-07-18 UAL121 BCN → EWR Jul 18, 10:32 UTCJul 18, 18:18 UTC7h 46m
2026-07-18 UAL121 BCN → EWR Jul 18, 10:30 UTCJul 18, 18:15 UTC7h 45m
2026-07-18 UAL120 EWR → BCN Jul 18, 00:00 UTCJul 18, 07:00 UTC7h 1m
2026-07-17 UAL1141 HNL → SFO Jul 17, 06:00 UTCJul 17, 10:40 UTC4h 40m
2026-07-14 UAL1593 - Jul 14, 13:45 UTCJul 14, 18:40 UTC4h 55m
2026-07-14 UAL1141 SFO → EWR Jul 14, 05:55 UTCJul 14, 10:45 UTC4h 50m
2026-07-12 UAL34 KIX → SFO Jul 12, 08:15 UTCJul 12, 17:47 UTC9h 32m
2026-07-12 UAL34 - Jul 12, 08:05 UTCJul 12, 09:25 UTC1h 20m
2026-07-11 UAL35 SFO → KIX Jul 11, 18:40 UTCJul 12, 05:20 UTC10h 40m
2026-07-10 UAL34 KIX → SFO Jul 10, 08:35 UTCJul 10, 18:40 UTC10h 5m
2026-07-09 UAL35 SFO → KIX Jul 9, 18:35 UTCJul 10, 05:52 UTC11h 17m
2026-07-09 UAL35 - Jul 9, 18:55 UTCJul 9, 19:25 UTC30m
2026-07-08 UAL2328 EWR → SFO Jul 8, 19:25 UTCJul 9, 00:40 UTC5h 15m
2026-07-08 UAL2328 - Jul 8, 19:30 UTCJul 9, 00:45 UTC5h 15m
2026-07-08 UAL31 - Jul 8, 08:35 UTCJul 8, 16:35 UTC8h 0m
2026-07-07 UAL30 EWR → MUC Jul 7, 23:10 UTCJul 8, 06:30 UTC7h 20m
2026-07-07 UAL905 LHR → EWR Jul 7, 09:05 UTCJul 7, 16:10 UTC7h 5m
2026-07-07 UAL905 LHR → EWR Jul 7, 08:55 UTCJul 7, 16:10 UTC7h 15m
2026-07-07 UAL14 - Jul 7, 00:05 UTCJul 7, 01:30 UTC1h 25m
2026-07-07 UAL14 EWR → LHR Jul 7, 00:00 UTCJul 7, 06:08 UTC6h 8m
2026-07-06 UAL3905 HND → EWR Jul 6, 01:30 UTCJul 6, 13:40 UTC12h 10m
2026-07-05 UAL803 IAD → HND Jul 5, 08:50 UTCJul 5, 18:40 UTC9h 50m
2026-07-05 UAL803 IAD → HND Jul 5, 02:10 UTCJul 5, 07:00 UTC4h 50m
2026-07-04 UAL885 FCO → IAD Jul 4, 08:50 UTCJul 4, 18:10 UTC9h 20m
2026-07-03 UAL884 - Jul 3, 22:20 UTCJul 4, 05:30 UTC7h 10m
2026-07-03 UAL884 IAD → FCO Jul 3, 22:07 UTCJul 4, 06:10 UTC8h 3m
2026-07-03 UAL914 CDG → IAD Jul 3, 12:00 UTCJul 3, 19:50 UTC7h 50m

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 N226UA page for operator, model, and routing details .

Mode-S A1F90E frequently asked

What is Mode-S code A1F90E?
A1F90E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N226UA.
Where is Mode-S A1F90E registered?
Mode-S code A1F90E 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 A1F90E broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1F90E, octal 50374416, decimal 10,615,054.
What flights does A1F90E operate?
Mode-S A1F90E has broadcast 20 distinct callsigns, including UAL35, UAL34, UAL18, UAL918, UAL914.