Apparatus

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sensors Mode-S transponder

A5DCDE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N477UA · AIRBUS A-320 · operated by UNITED AIRLINES INC

Hex
A5DCDE
Octal
51356336
Decimal
10,869,982
Country
US
Tail
N477UA
Type
A320
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
494
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S A5DCDE.

Country allocation

The ICAO 24-bit address A5DCDE 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
UAL2329 - 8 2026-07-17
UAL2479 - 6 2026-07-09
UAL1438 United Airlines 6 2026-06-03
UAL697 United Airlines 5 2026-06-04
UAL355 - 5 2026-07-10
UAL2159 United Airlines 5 2026-04-29
UAL1763 United Airlines 5 2026-07-25
UAL1345 - 5 2026-07-08
UAL708 United Airlines 4 2026-04-29
UAL579 United Airlines 4 2026-06-03
UAL358 - 4 2026-06-25
UAL333 United Airlines 4 2026-07-22
UAL2832 - 4 2026-06-25
UAL246 United Airlines 4 2026-05-04
UAL2051 United Airlines 4 2026-07-25
UAL1613 United Airlines 4 2026-07-24
UAL1564 - 4 2026-07-13
UAL1398 - 4 2026-06-24
UAL1337 United Airlines 4 2026-04-17
UAL1082 - 4 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1942 MSY → SFO Jul 26, 20:50 UTCJul 26, 21:30 UTC40m
2026-07-26 UAL790 DEN → AUS Jul 26, 18:10 UTCJul 26, 19:15 UTC1h 5m
2026-07-26 UAL336 SFO → EWR Jul 26, 14:55 UTCJul 26, 16:45 UTC1h 50m
2026-07-26 UAL1958 RDU → EWR Jul 26, 01:30 UTCJul 26, 02:45 UTC1h 15m
2026-07-26 UAL1958 RDU → EWR Jul 26, 01:34 UTCJul 26, 02:59 UTC1h 25m
2026-07-25 UAL2193 ATL → EWR Jul 25, 21:30 UTCJul 25, 23:25 UTC1h 55m
2026-07-25 UAL565 YYZ → SFO Jul 25, 18:05 UTCJul 25, 19:15 UTC1h 10m
2026-07-25 UAL565 YYZ → SFO Jul 25, 18:11 UTCJul 25, 19:27 UTC1h 16m
2026-07-25 UAL2051 SFO → YVR Jul 25, 12:55 UTCJul 25, 16:30 UTC3h 35m
2026-07-25 UAL1763 SFO → AUS Jul 25, 02:05 UTCJul 25, 04:50 UTC2h 45m
2026-07-24 UAL1367 BOS → IAH Jul 24, 20:35 UTCJul 25, 00:15 UTC3h 40m
2026-07-24 UAL283 DFW → EWR Jul 24, 16:10 UTCJul 24, 19:05 UTC2h 55m
2026-07-24 UAL2718 PDX → SFO Jul 24, 13:40 UTCJul 24, 14:25 UTC45m
2026-07-24 UAL1334 EWR → PBI Jul 24, 04:25 UTCJul 24, 05:05 UTC40m
2026-07-24 UAL2850 JAX → ORD Jul 24, 02:35 UTCJul 24, 03:30 UTC55m
2026-07-24 UAL1613 EWR → FLL Jul 24, 00:45 UTCJul 24, 01:15 UTC30m
2026-07-23 UAL2262 LAS → SFO Jul 23, 21:40 UTCJul 23, 23:00 UTC1h 20m
2026-07-23 UAL2262 LAS → SFO Jul 23, 21:38 UTCJul 23, 22:51 UTC1h 13m
2026-07-23 UAL2082 MDT → ORD Jul 23, 17:25 UTCJul 23, 19:40 UTC2h 15m
2026-07-23 UAL1256 RDU → DEN Jul 23, 13:00 UTCJul 23, 15:35 UTC2h 35m
2026-07-23 UAL2473 LAX → EWR Jul 23, 00:00 UTCJul 23, 02:25 UTC2h 25m
2026-07-22 UAL2447 RSW → EWR Jul 22, 20:10 UTCJul 22, 22:15 UTC2h 5m
2026-07-22 UAL2447 RSW → EWR Jul 22, 20:01 UTCJul 22, 22:01 UTC2h 0m
2026-07-22 UAL1026 DEN → AUS Jul 22, 16:31 UTCJul 22, 18:10 UTC1h 39m
2026-07-22 UAL1026 DEN → AUS Jul 22, 16:25 UTCJul 22, 18:10 UTC1h 45m
2026-07-22 UAL724 - Jul 22, 13:35 UTCJul 22, 14:40 UTC1h 5m
2026-07-22 UAL333 BOS → LAX Jul 22, 02:00 UTCJul 22, 03:05 UTC1h 5m
2026-07-21 UAL1790 EWR → MYR Jul 21, 20:05 UTCJul 21, 22:25 UTC2h 20m
2026-07-21 UAL1578 SFO → SBA Jul 21, 18:00 UTCJul 21, 18:45 UTC45m
2026-07-21 UAL1578 SFO → SBA Jul 21, 17:55 UTCJul 21, 18:40 UTC45m
2026-07-21 UAL2051 SFO → YVR Jul 21, 13:40 UTCJul 21, 16:40 UTC3h 0m
2026-07-21 UAL1763 SFO → AUS Jul 21, 02:09 UTCJul 21, 05:19 UTC3h 10m
2026-07-21 UAL1763 SFO → AUS Jul 21, 02:25 UTCJul 21, 05:20 UTC2h 55m
2026-07-20 UAL357 IAD → SFO Jul 20, 23:55 UTCJul 21, 00:50 UTC55m
2026-07-20 UAL626 - Jul 20, 21:20 UTCJul 20, 22:15 UTC55m
2026-07-20 UAL626 SFO → BUR Jul 20, 21:12 UTCJul 20, 22:07 UTC55m
2026-07-20 UAL718 MEX → SFO Jul 20, 15:50 UTCJul 20, 18:00 UTC2h 10m
2026-07-20 UAL718 MEX → SFO Jul 20, 13:55 UTCJul 20, 14:10 UTC15m
2026-07-20 UAL817 - Jul 20, 02:10 UTCJul 20, 02:20 UTC10m
2026-07-19 UAL817 - Jul 19, 22:25 UTCJul 20, 00:20 UTC1h 55m
2026-07-19 UAL1613 EWR → FLL Jul 19, 18:40 UTCJul 19, 20:10 UTC1h 30m
2026-07-19 UAL1613 EWR → FLL Jul 19, 18:31 UTCJul 19, 20:09 UTC1h 38m
2026-07-19 UAL2265 - Jul 19, 16:25 UTCJul 19, 17:35 UTC1h 10m
2026-07-19 UAL2340 ORD → MCO Jul 19, 13:55 UTCJul 19, 14:40 UTC45m
2026-07-19 UAL2866 LAX → CLE Jul 19, 04:45 UTCJul 19, 05:35 UTC50m
2026-07-19 UAL649 SFO → EWR Jul 19, 02:00 UTCJul 19, 03:30 UTC1h 30m
2026-07-18 UAL2602 - Jul 18, 22:30 UTCJul 19, 00:00 UTC1h 30m
2026-07-18 UAL1305 MSP → DEN Jul 18, 19:45 UTCJul 18, 21:15 UTC1h 30m
2026-07-18 UAL397 DEN → MSP Jul 18, 17:00 UTCJul 18, 18:35 UTC1h 35m
2026-07-18 UAL1354 DEN → DEN Jul 18, 03:10 UTCJul 18, 15:40 UTC12h 30m

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 N477UA page for operator, model, and routing details .

Mode-S A5DCDE frequently asked

What is Mode-S code A5DCDE?
A5DCDE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N477UA.
Where is Mode-S A5DCDE registered?
Mode-S code A5DCDE 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 A5DCDE broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5DCDE, octal 51356336, decimal 10,869,982.
What flights does A5DCDE operate?
Mode-S A5DCDE has broadcast 20 distinct callsigns, including UAL2329, UAL2479, UAL1438, UAL697, UAL355.