Apparatus

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sensors Mode-S transponder

A1FCC5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N227UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
A1FCC5
Octal
50376305
Decimal
10,616,005
Country
US
Tail
N227UA
Type
B772
No current signal · last broadcast Jul 26, 18:25 UTC
Flights observed
284
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:25 UTC

Last known position

Most recent position reported by Mode-S A1FCC5.

Country allocation

The ICAO 24-bit address A1FCC5 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
UAL5 - 16 2026-07-17
UAL925 - 15 2026-07-17
UAL22 United Airlines 14 2026-07-22
UAL924 - 12 2026-07-05
UAL4 - 9 2026-07-03
UAL23 United Airlines 9 2026-06-11
UAL919 - 8 2026-07-10
UAL885 - 8 2026-07-19
UAL819 - 8 2026-07-12
UAL194 - 8 2026-06-24
UAL130 United Airlines 8 2026-07-21
UAL969 United Airlines 7 2026-05-19
UAL59 - 7 2026-06-15
UAL852 - 6 2026-06-14
UAL818 - 6 2026-07-13
UAL47 - 6 2026-07-16
UAL943 United Airlines 5 2026-07-18
UAL918 - 5 2026-07-10
UAL884 United Airlines 5 2026-07-18
UAL880 United Airlines 5 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL121 BCN → EWR Jul 26, 10:40 UTCJul 26, 18:15 UTC7h 35m
2026-07-26 UAL120 EWR → BCN Jul 26, 00:10 UTCJul 26, 07:00 UTC6h 51m
2026-07-23 UAL71 AMS → EWR Jul 23, 08:00 UTCJul 23, 15:25 UTC7h 25m
2026-07-22 UAL70 EWR → AMS Jul 22, 22:35 UTCJul 23, 05:00 UTC6h 25m
2026-07-22 UAL22 DUB → EWR Jul 22, 01:25 UTCJul 22, 15:45 UTC14h 20m
2026-07-21 UAL130 HND → EWR Jul 21, 10:50 UTCJul 21, 22:37 UTC11h 47m
2026-07-21 UAL130 HND → EWR Jul 21, 10:50 UTCJul 21, 22:46 UTC11h 56m
2026-07-21 UAL130 HND → EWR Jul 21, 10:50 UTCJul 21, 11:25 UTC35m
2026-07-20 UAL803 IAD → HND Jul 20, 18:00 UTCJul 21, 08:05 UTC14h 4m
2026-07-19 UAL885 - Jul 19, 09:45 UTCJul 19, 11:15 UTC1h 30m
2026-07-19 UAL885 FCO → IAD Jul 19, 09:27 UTCJul 19, 18:35 UTC9h 8m
2026-07-18 UAL884 IAD → FCO Jul 18, 23:18 UTCJul 19, 07:09 UTC7h 51m
2026-07-18 UAL884 IAD → FCO Jul 18, 23:05 UTCJul 19, 07:05 UTC8h 0m
2026-07-18 UAL943 LIS → IAD Jul 18, 11:46 UTCJul 18, 19:37 UTC7h 51m
2026-07-18 UAL943 LIS → IAD Jul 18, 11:40 UTCJul 18, 19:40 UTC8h 0m
2026-07-18 UAL942 IAD → LIS Jul 18, 03:05 UTCJul 18, 09:25 UTC6h 20m
2026-07-17 UAL925 - Jul 17, 16:00 UTCJul 17, 23:10 UTC7h 10m
2026-07-17 UAL925 LHR → IAD Jul 17, 16:04 UTCJul 17, 23:06 UTC7h 2m
2026-07-17 UAL5 - Jul 17, 01:45 UTCJul 17, 10:35 UTC8h 50m
2026-07-17 UAL5 IAH → LHR Jul 17, 01:36 UTCJul 17, 10:29 UTC8h 53m
2026-07-16 UAL47 - Jul 16, 13:05 UTCJul 16, 22:55 UTC9h 50m
2026-07-16 UAL932 IAD → FRA Jul 16, 03:05 UTCJul 16, 10:29 UTC7h 25m
2026-07-15 UAL925 LHR → IAD Jul 15, 16:20 UTCJul 15, 23:50 UTC7h 30m
2026-07-15 UAL5 - Jul 15, 01:30 UTCJul 15, 10:35 UTC9h 5m
2026-07-14 UAL47 - Jul 14, 12:15 UTCJul 14, 22:20 UTC10h 5m
2026-07-13 UAL46 - Jul 13, 23:40 UTCJul 14, 09:10 UTC9h 30m
2026-07-13 UAL818 - Jul 13, 00:05 UTCJul 13, 09:45 UTC9h 40m
2026-07-12 UAL819 - Jul 12, 04:05 UTCJul 12, 13:15 UTC9h 10m
2026-07-12 UAL819 IAH → EZE Jul 12, 04:01 UTCJul 12, 13:19 UTC9h 18m
2026-07-11 UAL47 - Jul 11, 12:40 UTCJul 11, 22:40 UTC10h 0m
2026-07-11 UAL47 FRA → IAH Jul 11, 12:41 UTCJul 11, 22:33 UTC9h 52m
2026-07-11 UAL932 IAD → FRA Jul 11, 03:15 UTCJul 11, 10:35 UTC7h 20m
2026-07-10 UAL919 LHR → IAD Jul 10, 12:00 UTCJul 10, 19:40 UTC7h 40m
2026-07-10 UAL918 IAD → LHR Jul 10, 00:56 UTCJul 10, 07:35 UTC6h 39m
2026-07-10 UAL918 IAD → LHR Jul 10, 00:45 UTCJul 10, 07:50 UTC7h 5m
2026-07-09 UAL885 - Jul 9, 18:20 UTCJul 9, 18:35 UTC15m
2026-07-09 UAL885 - Jul 9, 09:10 UTCJul 9, 11:45 UTC2h 35m
2026-07-09 UAL885 FCO → IAD Jul 9, 08:47 UTCJul 9, 18:05 UTC9h 18m
2026-07-09 UAL885 FCO → IAD Jul 9, 08:47 UTCJul 9, 18:30 UTC9h 43m
2026-07-08 UAL884 - Jul 8, 22:15 UTCJul 9, 00:25 UTC2h 10m
2026-07-08 UAL884 IAD → FCO Jul 8, 21:58 UTCJul 9, 06:30 UTC8h 32m
2026-07-08 UAL919 - Jul 8, 11:25 UTCJul 8, 18:45 UTC7h 20m
2026-07-08 UAL919 LHR → IAD Jul 8, 11:40 UTCJul 8, 18:43 UTC7h 3m
2026-07-07 UAL880 IAH → LHR Jul 7, 22:05 UTCJul 8, 07:10 UTC9h 5m
2026-07-07 UAL879 - Jul 7, 09:45 UTCJul 7, 19:00 UTC9h 15m
2026-07-06 UAL918 IAD → LHR Jul 6, 23:21 UTCJul 7, 06:06 UTC6h 45m
2026-07-06 UAL918 IAD → LHR Jul 6, 23:40 UTCJul 7, 06:10 UTC6h 30m
2026-07-05 UAL919 LHR → IAD Jul 5, 12:40 UTCJul 5, 20:00 UTC7h 20m
2026-07-05 UAL924 IAD → LHR Jul 5, 02:53 UTCJul 5, 10:27 UTC7h 34m
2026-07-05 UAL924 - Jul 5, 03:35 UTCJul 5, 04:50 UTC1h 15m

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 N227UA page for operator, model, and routing details .

Mode-S A1FCC5 frequently asked

What is Mode-S code A1FCC5?
A1FCC5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N227UA.
Where is Mode-S A1FCC5 registered?
Mode-S code A1FCC5 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 A1FCC5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1FCC5, octal 50376305, decimal 10,616,005.
What flights does A1FCC5 operate?
Mode-S A1FCC5 has broadcast 20 distinct callsigns, including UAL5, UAL925, UAL22, UAL924, UAL4.