Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A1D8FD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N218UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
A1D8FD
Octal
50354375
Decimal
10,606,845
Country
US
Tail
N218UA
Type
B772
No current signal · last broadcast 2h ago
Flights observed
177
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A1D8FD.

Country allocation

The ICAO 24-bit address A1D8FD 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 - 15 2026-06-25
UAL34 - 8 2026-06-26
UAL942 - 6 2026-07-05
UAL933 - 6 2026-07-06
UAL18 - 6 2026-07-13
UAL943 United Airlines 5 2026-07-05
UAL927 - 5 2026-06-20
UAL926 - 5 2026-06-20
UAL195 United Airlines 5 2026-04-15
UAL19 - 5 2026-07-12
UAL102 United Airlines 5 2026-04-15
UAL984 United Airlines 4 2026-05-19
UAL969 - 4 2026-06-19
UAL949 - 4 2026-06-22
UAL879 - 4 2026-04-14
UAL673 United Airlines 4 2026-05-21
UAL120 - 4 2026-07-13
UAL990 United Airlines 3 2026-05-07
UAL968 - 3 2026-06-18
UAL915 United Airlines 3 2026-05-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 UAL120 EWR → BCN Jul 13, 23:45 UTCJul 14, 06:54 UTC7h 9m
2026-07-13 UAL120 - Jul 13, 23:45 UTCJul 14, 00:25 UTC40m
2026-07-13 UAL18 MXP → EWR Jul 13, 08:01 UTCJul 13, 16:00 UTC8h 0m
2026-07-12 UAL19 EWR → MXP Jul 12, 21:55 UTCJul 13, 05:10 UTC7h 15m
2026-07-12 UAL55 - Jul 12, 11:35 UTCJul 12, 18:45 UTC7h 10m
2026-07-12 UAL55 CDG → EWR Jul 12, 11:44 UTCJul 12, 18:43 UTC6h 59m
2026-07-12 UAL54 EWR → CDG Jul 12, 02:19 UTCJul 12, 08:42 UTC6h 23m
2026-07-12 UAL54 - Jul 12, 02:20 UTCJul 12, 03:15 UTC55m
2026-07-11 UAL18 MXP → EWR Jul 11, 08:06 UTCJul 11, 16:18 UTC8h 12m
2026-07-11 UAL18 MXP → EWR Jul 11, 08:05 UTCJul 11, 16:15 UTC8h 10m
2026-07-10 UAL19 EWR → MXP Jul 10, 22:15 UTCJul 11, 05:20 UTC7h 5m
2026-07-10 UAL121 BCN → EWR Jul 10, 10:10 UTCJul 10, 18:05 UTC7h 55m
2026-07-10 UAL120 EWR → BCN Jul 10, 00:00 UTCJul 10, 06:46 UTC6h 46m
2026-07-10 UAL120 EWR → BCN Jul 10, 00:00 UTCJul 10, 06:50 UTC6h 50m
2026-07-08 UAL130 HND → EWR Jul 8, 10:15 UTCJul 8, 22:15 UTC12h 0m
2026-07-07 UAL803 IAD → HND Jul 7, 18:30 UTCJul 8, 08:10 UTC13h 40m
2026-07-07 UAL803 IAD → HND Jul 7, 18:20 UTCJul 8, 08:14 UTC13h 54m
2026-07-06 UAL933 - Jul 6, 15:40 UTCJul 6, 17:15 UTC1h 35m
2026-07-06 UAL933 FRA → IAD Jul 6, 15:31 UTCJul 6, 23:58 UTC8h 27m
2026-07-06 UAL932 IAD → FRA Jul 6, 05:45 UTCJul 6, 12:40 UTC6h 55m
2026-07-05 UAL943 LIS → IAD Jul 5, 14:50 UTCJul 5, 22:00 UTC7h 10m
2026-07-05 UAL942 IAD → LIS Jul 5, 05:35 UTCJul 5, 12:15 UTC6h 40m
2026-07-03 UAL943 LIS → IAD Jul 3, 11:35 UTCJul 3, 18:50 UTC7h 15m
2026-07-03 UAL942 IAD → LIS Jul 3, 03:05 UTCJul 3, 09:30 UTC6h 25m
2026-07-02 UAL925 - Jul 2, 16:05 UTCJul 2, 23:55 UTC7h 50m
2026-07-02 UAL924 IAD → LHR Jul 2, 02:50 UTCJul 2, 09:35 UTC6h 45m
2026-07-01 UAL933 - Jul 1, 22:20 UTCJul 2, 00:05 UTC1h 45m
2026-07-01 UAL933 - Jul 1, 15:45 UTCJul 1, 22:15 UTC6h 30m
2026-07-01 UAL933 FRA → IAD Jul 1, 15:31 UTCJul 2, 00:04 UTC8h 33m
2026-07-01 UAL932 - Jul 1, 05:55 UTCJul 1, 13:00 UTC7h 5m
2026-06-30 UAL933 FRA → IAD Jun 30, 19:15 UTCJul 1, 03:10 UTC7h 55m
2026-06-30 UAL46 - Jun 30, 09:35 UTCJun 30, 16:25 UTC6h 50m
2026-06-29 UAL3900 SJC → DEN Jun 29, 22:39 UTCJun 30, 01:14 UTC2h 35m
2026-06-29 UAL3900 SJC → DEN Jun 29, 22:17 UTCJun 30, 01:38 UTC3h 21m
2026-06-27 UAL160 - Jun 27, 10:34 UTCJun 27, 21:29 UTC10h 55m
2026-06-26 UAL194 SFO → MUC Jun 26, 21:39 UTCJun 27, 08:14 UTC10h 35m
2026-06-26 UAL34 KIX → SFO Jun 26, 08:15 UTCJun 26, 18:03 UTC9h 48m
2026-06-26 UAL34 KIX → SFO Jun 26, 08:15 UTCJun 26, 18:07 UTC9h 52m
2026-06-26 UAL34 - Jun 26, 08:15 UTCJun 26, 09:20 UTC1h 5m
2026-06-25 UAL35 SFO → KIX Jun 25, 19:10 UTCJun 26, 05:55 UTC10h 45m
2026-06-25 UAL35 SFO → KIX Jun 25, 19:05 UTCJun 26, 06:00 UTC10h 55m
2026-06-25 UAL916 AKL → SFO Jun 25, 02:10 UTCJun 25, 13:29 UTC11h 20m
2026-06-24 UAL917 SFO → AKL Jun 24, 06:37 UTCJun 24, 19:08 UTC12h 31m
2026-06-24 UAL917 - Jun 24, 06:39 UTCJun 24, 07:10 UTC30m
2026-06-23 UAL1777 EWR → SFO Jun 23, 13:05 UTCJun 23, 18:39 UTC5h 35m
2026-06-23 UAL8214 YYZ → BOS Jun 23, 05:54 UTCJun 23, 10:24 UTC4h 30m
2026-06-22 UAL949 - Jun 22, 12:34 UTCJun 22, 22:40 UTC10h 5m
2026-06-22 UAL949 LHR → SFO Jun 22, 12:25 UTCJun 22, 22:44 UTC10h 19m
2026-06-22 UAL948 SFO → LHR Jun 22, 00:14 UTCJun 22, 10:25 UTC10h 10m
2026-06-20 UAL927 - Jun 20, 16:09 UTCJun 21, 02:45 UTC10h 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 N218UA page for operator, model, and routing details .

Mode-S A1D8FD frequently asked

What is Mode-S code A1D8FD?
A1D8FD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N218UA.
Where is Mode-S A1D8FD registered?
Mode-S code A1D8FD 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 A1D8FD broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1D8FD, octal 50354375, decimal 10,606,845.
What flights does A1D8FD operate?
Mode-S A1D8FD has broadcast 20 distinct callsigns, including UAL35, UAL34, UAL942, UAL933, UAL18.