sensors Mode-S transponder

A47FDE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N38955 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC

Hex
A47FDE
Octal
51077736
Decimal
10,780,638
Country
US
Tail
N38955
Type
B789
No current signal · last broadcast Jul 26, 16:40 UTC
Flights observed
185
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 16:40 UTC

Last known position

Most recent position reported by Mode-S A47FDE.

Country allocation

The ICAO 24-bit address A47FDE 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
UAL32 United Airlines 9 2026-07-17
UAL821 United Airlines 8 2026-05-24
UAL820 United Airlines 6 2026-05-24
UAL181 United Airlines 6 2026-07-22
UAL842 United Airlines 5 2026-05-26
UAL839 - 5 2026-07-10
UAL83 - 5 2026-07-14
UAL27 United Airlines 5 2026-07-23
UAL187 - 5 2026-07-12
UAL142 - 5 2026-07-21
UAL82 - 4 2026-07-14
UAL62 United Airlines 4 2026-07-19
UAL2692 - 4 2026-07-15
UAL263 United Airlines 4 2026-07-25
UAL1011 - 4 2026-06-18
UAL99 - 3 2026-06-26
UAL98 United Airlines 3 2026-06-25
UAL870 - 3 2026-07-11
UAL78 United Airlines 3 2026-05-13
UAL713 - 3 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL761 MUC → DEN Jul 26, 14:40 UTCJul 26, 16:40 UTC2h 0m
2026-07-26 UAL760 DEN → MUC Jul 26, 03:25 UTCJul 26, 12:30 UTC9h 6m
2026-07-25 UAL263 EWR → PBI Jul 25, 14:09 UTCJul 25, 23:16 UTC9h 7m
2026-07-25 UAL263 EWR → PBI Jul 25, 14:09 UTCJul 25, 23:32 UTC9h 23m
2026-07-25 UAL263 EWR → PBI Jul 25, 14:05 UTCJul 25, 15:20 UTC1h 15m
2026-07-25 UAL262 DEN → LHR Jul 25, 03:20 UTCJul 25, 11:40 UTC8h 20m
2026-07-24 UAL178 KIX → GUM Jul 24, 13:15 UTCJul 24, 23:55 UTC10h 40m
2026-07-24 UAL177 GUM → KIX Jul 24, 00:10 UTCJul 24, 09:55 UTC9h 45m
2026-07-23 UAL26 LHR → DEN Jul 23, 11:10 UTCJul 23, 20:20 UTC9h 10m
2026-07-23 UAL27 DEN → LHR Jul 23, 00:25 UTCJul 23, 08:55 UTC8h 30m
2026-07-22 UAL181 FRA → DEN Jul 22, 09:41 UTCJul 22, 19:28 UTC9h 47m
2026-07-21 UAL181 FRA → DEN Jul 21, 22:15 UTCJul 22, 19:30 UTC21h 15m
2026-07-21 UAL142 - Jul 21, 07:55 UTCJul 21, 18:10 UTC10h 15m
2026-07-21 UAL142 NRT → DEN Jul 21, 07:50 UTCJul 21, 18:02 UTC10h 12m
2026-07-20 UAL7 IAH → NRT Jul 20, 16:05 UTCJul 21, 04:50 UTC12h 45m
2026-07-20 UAL63 GRU → IAH Jul 20, 00:55 UTCJul 20, 10:15 UTC9h 20m
2026-07-19 UAL62 IAH → GRU Jul 19, 00:10 UTCJul 19, 09:15 UTC9h 5m
2026-07-19 UAL62 IAH → GRU Jul 19, 00:13 UTCJul 19, 09:13 UTC9h 0m
2026-07-18 UAL6 - Jul 18, 08:10 UTCJul 18, 20:00 UTC11h 50m
2026-07-17 UAL32 LAX → NRT Jul 17, 18:15 UTCJul 18, 04:31 UTC10h 16m
2026-07-17 UAL32 LAX → NRT Jul 17, 18:25 UTCJul 18, 04:25 UTC10h 1m
2026-07-16 UAL935 - Jul 16, 12:25 UTCJul 16, 22:45 UTC10h 20m
2026-07-15 UAL923 - Jul 15, 22:55 UTCJul 16, 08:55 UTC10h 0m
2026-07-15 UAL2692 - Jul 15, 14:00 UTCJul 15, 18:30 UTC4h 30m
2026-07-14 UAL83 - Jul 14, 18:45 UTCJul 15, 10:00 UTC15h 14m
2026-07-14 UAL82 - Jul 14, 02:10 UTCJul 14, 16:05 UTC13h 55m
2026-07-12 UAL187 - Jul 12, 20:05 UTCJul 12, 23:15 UTC3h 10m
2026-07-12 UAL187 JNB → EWR Jul 12, 20:19 UTCJul 13, 11:11 UTC14h 52m
2026-07-12 UAL187 JNB → EWR Jul 12, 20:19 UTCJul 13, 11:20 UTC15h 1m
2026-07-12 UAL188 - Jul 12, 02:10 UTCJul 12, 16:05 UTC13h 55m
2026-07-11 UAL713 - Jul 11, 18:10 UTCJul 11, 23:00 UTC4h 50m
2026-07-11 UAL870 - Jul 11, 00:45 UTCJul 11, 13:55 UTC13h 10m
2026-07-10 UAL839 - Jul 10, 06:20 UTCJul 10, 20:35 UTC14h 15m
2026-07-09 UAL935 - Jul 9, 12:35 UTCJul 9, 22:50 UTC10h 15m
2026-07-08 UAL923 - Jul 8, 22:50 UTCJul 9, 08:45 UTC9h 55m
2026-07-08 UAL2692 - Jul 8, 13:45 UTCJul 8, 18:25 UTC4h 40m
2026-07-08 UAL3916 - Jul 8, 02:00 UTCJul 8, 04:45 UTC2h 45m
2026-06-30 UAL63 - Jun 30, 03:10 UTCJun 30, 12:30 UTC9h 20m
2026-06-28 UAL62 - Jun 28, 00:04 UTCJun 28, 07:29 UTC7h 25m
2026-06-28 UAL62 IAH → GRU Jun 28, 00:03 UTCJun 28, 08:55 UTC8h 52m
2026-06-27 UAL6 - Jun 27, 08:20 UTCJun 27, 19:55 UTC11h 35m
2026-06-26 UAL32 LAX → NRT Jun 26, 18:15 UTCJun 27, 05:30 UTC11h 15m
2026-06-26 UAL32 - Jun 26, 18:24 UTCJun 27, 05:35 UTC11h 10m
2026-06-26 UAL99 - Jun 26, 00:59 UTCJun 26, 14:05 UTC13h 5m
2026-06-26 UAL99 - Jun 26, 00:20 UTCJun 26, 00:50 UTC30m
2026-06-25 UAL98 LAX → MEL Jun 25, 05:55 UTCJun 25, 21:20 UTC15h 25m
2026-06-24 UAL99 - Jun 24, 00:09 UTCJun 24, 13:30 UTC13h 20m
2026-06-23 UAL98 LAX → MEL Jun 23, 05:54 UTCJun 23, 19:29 UTC13h 35m
2026-06-23 UAL98 LAX → MEL Jun 23, 05:59 UTCJun 23, 21:26 UTC15h 27m
2026-06-22 UAL2403 - Jun 22, 16:24 UTCJun 22, 21:25 UTC5h 0m

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 N38955 page for operator, model, and routing details .

Mode-S A47FDE frequently asked

What is Mode-S code A47FDE?
A47FDE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N38955.
Where is Mode-S A47FDE registered?
Mode-S code A47FDE 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 A47FDE broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 16:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A47FDE, octal 51077736, decimal 10,780,638.
What flights does A47FDE operate?
Mode-S A47FDE has broadcast 20 distinct callsigns, including UAL32, UAL821, UAL820, UAL181, UAL842.