Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A1F1A0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N224UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
A1F1A0
Octal
50370640
Decimal
10,613,152
Country
US
Tail
N224UA
Type
B772
No current signal · last broadcast Jul 26, 09:45 UTC
Flights observed
216
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 09:45 UTC

Last known position

Most recent position reported by Mode-S A1F1A0.

Country allocation

The ICAO 24-bit address A1F1A0 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
UAL55 - 10 2026-07-09
UAL22 - 10 2026-07-12
UAL54 - 9 2026-07-09
UAL23 - 8 2026-07-12
UAL925 United Airlines 7 2026-07-23
UAL885 - 7 2026-06-18
UAL71 - 7 2026-07-11
UAL18 - 7 2026-07-10
UAL924 United Airlines 6 2026-07-24
UAL19 - 6 2026-07-09
UAL915 United Airlines 5 2026-06-04
UAL884 - 5 2026-06-17
UAL852 - 5 2026-06-27
UAL70 - 5 2026-07-11
UAL14 - 5 2026-07-14
UAL942 United Airlines 4 2026-06-02
UAL914 - 4 2026-07-20
UAL853 - 4 2026-06-26
UAL804 United Airlines 4 2026-04-21
UAL56 United Airlines 4 2026-06-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL818 EZE → IAH Jul 26, 00:10 UTCJul 26, 09:45 UTC9h 36m
2026-07-25 UAL819 IAH → EZE Jul 25, 10:55 UTCJul 25, 11:10 UTC15m
2026-07-25 UAL819 IAH → EZE Jul 25, 01:50 UTCJul 25, 10:25 UTC8h 35m
2026-07-24 UAL4 LHR → IAH Jul 24, 12:50 UTCJul 24, 14:05 UTC1h 15m
2026-07-24 UAL4 LHR → IAH Jul 24, 13:05 UTCJul 24, 22:13 UTC9h 8m
2026-07-24 UAL924 IAD → LHR Jul 24, 03:05 UTCJul 24, 09:35 UTC6h 30m
2026-07-23 UAL925 LHR → IAD Jul 23, 16:10 UTCJul 23, 23:25 UTC7h 15m
2026-07-23 UAL925 LHR → IAD Jul 23, 16:04 UTCJul 23, 23:20 UTC7h 16m
2026-07-23 UAL5 IAH → LHR Jul 23, 01:35 UTCJul 23, 10:15 UTC8h 40m
2026-07-22 UAL4 LHR → IAH Jul 22, 13:25 UTCJul 22, 22:55 UTC9h 30m
2026-07-22 UAL924 IAD → LHR Jul 22, 02:43 UTCJul 22, 09:27 UTC6h 44m
2026-07-22 UAL924 IAD → LHR Jul 22, 02:55 UTCJul 22, 04:45 UTC1h 50m
2026-07-21 UAL925 LHR → IAD Jul 21, 23:45 UTCJul 22, 00:00 UTC15m
2026-07-21 UAL925 LHR → IAD Jul 21, 16:20 UTCJul 21, 23:40 UTC7h 20m
2026-07-21 UAL924 IAD → LHR Jul 21, 03:00 UTCJul 21, 09:50 UTC6h 50m
2026-07-20 UAL914 CDG → IAD Jul 20, 13:24 UTCJul 20, 20:25 UTC7h 1m
2026-07-20 UAL914 - Jul 20, 12:40 UTCJul 20, 20:30 UTC7h 50m
2026-07-19 UAL990 SFO → CDG Jul 19, 22:15 UTCJul 20, 07:45 UTC9h 30m
2026-07-19 UAL34 KIX → SFO Jul 19, 08:05 UTCJul 19, 17:55 UTC9h 50m
2026-07-18 UAL35 SFO → KIX Jul 18, 19:00 UTCJul 19, 05:30 UTC10h 30m
2026-07-17 UAL59 FRA → SFO Jul 17, 11:35 UTCJul 17, 22:35 UTC11h 0m
2026-07-16 UAL58 - Jul 16, 21:35 UTCJul 17, 07:30 UTC9h 55m
2026-07-16 UAL1593 - Jul 16, 13:40 UTCJul 16, 18:50 UTC5h 10m
2026-07-16 UAL1141 SFO → EWR Jul 16, 06:20 UTCJul 16, 10:55 UTC4h 35m
2026-07-14 UAL2328 EWR → SFO Jul 14, 21:05 UTCJul 15, 02:03 UTC4h 58m
2026-07-14 UAL2328 - Jul 14, 20:55 UTCJul 15, 02:10 UTC5h 14m
2026-07-14 UAL905 - Jul 14, 10:30 UTCJul 14, 11:40 UTC1h 10m
2026-07-14 UAL905 LHR → EWR Jul 14, 09:55 UTCJul 14, 17:18 UTC7h 23m
2026-07-14 UAL14 EWR → LHR Jul 14, 01:00 UTCJul 14, 07:35 UTC6h 35m
2026-07-13 UAL905 LHR → EWR Jul 13, 09:00 UTCJul 13, 15:45 UTC6h 45m
2026-07-12 UAL14 EWR → LHR Jul 12, 23:35 UTCJul 13, 05:45 UTC6h 10m
2026-07-12 UAL14 - Jul 12, 23:20 UTCJul 13, 05:45 UTC6h 25m
2026-07-12 UAL22 DUB → EWR Jul 12, 09:55 UTCJul 12, 16:15 UTC6h 20m
2026-07-12 UAL22 DUB → EWR Jul 12, 09:55 UTCJul 12, 16:12 UTC6h 17m
2026-07-12 UAL23 - Jul 12, 02:01 UTCJul 12, 07:40 UTC5h 40m
2026-07-11 UAL71 AMS → EWR Jul 11, 09:52 UTCJul 11, 17:33 UTC7h 41m
2026-07-11 UAL71 - Jul 11, 10:00 UTCJul 11, 17:40 UTC7h 40m
2026-07-11 UAL70 - Jul 11, 01:00 UTCJul 11, 07:25 UTC6h 25m
2026-07-10 UAL18 MXP → EWR Jul 10, 08:43 UTCJul 10, 17:15 UTC8h 32m
2026-07-10 UAL18 MXP → EWR Jul 10, 09:05 UTCJul 10, 17:15 UTC8h 10m
2026-07-09 UAL19 - Jul 9, 23:15 UTCJul 10, 00:50 UTC1h 35m
2026-07-09 UAL19 EWR → MXP Jul 9, 22:48 UTCJul 10, 06:24 UTC7h 36m
2026-07-09 UAL55 - Jul 9, 11:40 UTCJul 9, 13:15 UTC1h 35m
2026-07-09 UAL55 CDG → EWR Jul 9, 11:44 UTCJul 9, 19:03 UTC7h 19m
2026-07-09 UAL55 CDG → EWR Jul 9, 11:44 UTCJul 9, 19:12 UTC7h 28m
2026-07-09 UAL54 EWR → CDG Jul 9, 02:00 UTCJul 9, 08:40 UTC6h 40m
2026-07-08 UAL55 - Jul 8, 11:25 UTCJul 8, 18:40 UTC7h 15m
2026-07-08 UAL54 EWR → CDG Jul 8, 02:05 UTCJul 8, 08:50 UTC6h 45m
2026-07-07 UAL55 CDG → EWR Jul 7, 14:04 UTCJul 7, 20:52 UTC6h 48m
2026-07-07 UAL55 CDG → EWR Jul 7, 14:04 UTCJul 7, 20:53 UTC6h 49m

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 N224UA page for operator, model, and routing details .

Mode-S A1F1A0 frequently asked

What is Mode-S code A1F1A0?
A1F1A0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N224UA.
Where is Mode-S A1F1A0 registered?
Mode-S code A1F1A0 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 A1F1A0 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 09:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1F1A0, octal 50370640, decimal 10,613,152.
What flights does A1F1A0 operate?
Mode-S A1F1A0 has broadcast 20 distinct callsigns, including UAL55, UAL22, UAL54, UAL23, UAL925.