Apparatus

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sensors Mode-S transponder

A5D31D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N47457 · operated by UNITED AIRLINES INC

Hex
A5D31D
Octal
51351435
Decimal
10,867,485
Country
US
Tail
N47457
No current signal · last broadcast Jul 26, 20:10 UTC
Flights observed
112
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:10 UTC

Last known position

Most recent position reported by Mode-S A5D31D.

Country allocation

The ICAO 24-bit address A5D31D 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
BOE123 - 5 2026-06-01
BOE957 - 4 2026-06-26
UAL454 - 3 2026-07-14
UAL2381 - 3 2026-07-18
UAL2339 - 3 2026-07-08
UAL2022 United Airlines 3 2026-07-22
UAL569 - 2 2026-07-11
UAL4211 - 2 2026-06-30
UAL3748 - 2 2026-07-10
UAL3738 - 2 2026-07-10
UAL2796 - 2 2026-07-17
UAL2740 - 2 2026-07-07
UAL2691 - 2 2026-07-16
UAL2428 United Airlines 2 2026-07-24
UAL2417 - 2 2026-07-08
UAL2095 - 2 2026-07-18
UAL2025 - 2 2026-07-22
UAL1720 United Airlines 2 2026-07-25
UAL1668 United Airlines 2 2026-07-20
UAL1647 United Airlines 2 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2125 BNA → IAD Jul 26, 18:45 UTCJul 26, 20:05 UTC1h 20m
2026-07-26 UAL2414 IAH → SFO Jul 26, 16:00 UTCJul 26, 17:00 UTC1h 0m
2026-07-26 UAL2653 RSW → EWR Jul 26, 12:25 UTCJul 26, 13:50 UTC1h 25m
2026-07-26 UAL1658 IAD → BDL Jul 26, 02:45 UTCJul 26, 04:00 UTC1h 15m
2026-07-25 UAL590 ORD → MSN Jul 25, 21:45 UTCJul 25, 23:20 UTC1h 35m
2026-07-25 UAL1720 SFO → MSY Jul 25, 17:25 UTCJul 25, 20:00 UTC2h 35m
2026-07-25 UAL1720 SFO → MSY Jul 25, 17:21 UTCJul 25, 20:00 UTC2h 39m
2026-07-25 UAL2319 SFO → LAX Jul 25, 13:25 UTCJul 25, 15:10 UTC1h 45m
2026-07-24 UAL2851 BUR → SFO Jul 24, 22:25 UTCJul 25, 03:15 UTC4h 50m
2026-07-24 UAL2428 PHX → EWR Jul 24, 19:20 UTCJul 24, 20:30 UTC1h 10m
2026-07-24 UAL2428 PHX → EWR Jul 24, 19:17 UTCJul 24, 20:24 UTC1h 7m
2026-07-24 UAL1930 MIA → EWR Jul 24, 12:55 UTCJul 24, 17:30 UTC4h 35m
2026-07-24 UAL2632 MSY → EWR Jul 24, 04:40 UTCJul 24, 09:00 UTC4h 20m
2026-07-23 UAL600 EWR → LAS Jul 23, 22:20 UTCJul 24, 02:00 UTC3h 40m
2026-07-23 UAL1983 MIA → ORD Jul 23, 16:45 UTCJul 23, 19:30 UTC2h 45m
2026-07-23 UAL1358 EWR → ATL Jul 23, 12:25 UTCJul 23, 14:50 UTC2h 25m
2026-07-23 UAL1738 MCO → EWR Jul 23, 02:55 UTCJul 23, 04:35 UTC1h 40m
2026-07-22 UAL2388 LAS → EWR Jul 22, 22:10 UTCJul 23, 00:45 UTC2h 35m
2026-07-22 UAL8135 CLE → YYZ Jul 22, 17:10 UTCJul 22, 19:45 UTC2h 35m
2026-07-22 UAL2022 SJU → IAD Jul 22, 13:50 UTCJul 22, 14:50 UTC1h 0m
2026-07-22 UAL2022 SJU → IAD Jul 22, 11:30 UTCJul 22, 11:40 UTC10m
2026-07-22 UAL2022 SJU → IAD Jul 22, 11:33 UTCJul 22, 14:50 UTC3h 17m
2026-07-22 UAL2025 IAD → SJU Jul 22, 00:34 UTCJul 22, 06:33 UTC5h 59m
2026-07-22 UAL2025 - Jul 22, 02:55 UTCJul 22, 04:15 UTC1h 20m
2026-07-21 UAL1071 EWR → ORD Jul 21, 15:15 UTCJul 21, 20:05 UTC4h 50m
2026-07-21 UAL2407 TPA → EWR Jul 21, 02:15 UTCJul 21, 04:50 UTC2h 35m
2026-07-20 UAL1387 - Jul 20, 20:05 UTCJul 20, 23:35 UTC3h 30m
2026-07-20 UAL1668 LAX → AUS Jul 20, 15:13 UTCJul 20, 18:26 UTC3h 13m
2026-07-20 UAL1668 LAX → AUS Jul 20, 15:30 UTCJul 20, 18:30 UTC3h 0m
2026-07-20 UAL2645 IAH → CMH Jul 20, 02:45 UTCJul 20, 05:50 UTC3h 5m
2026-07-19 UAL1647 IAH → MSY Jul 19, 23:20 UTCJul 20, 00:20 UTC1h 0m
2026-07-19 UAL1647 IAH → MSY Jul 19, 23:10 UTCJul 20, 00:16 UTC1h 6m
2026-07-19 UAL1536 EWR → BOS Jul 19, 21:27 UTCJul 19, 21:57 UTC30m
2026-07-19 UAL1536 EWR → BOS Jul 19, 21:15 UTCJul 19, 21:55 UTC40m
2026-07-19 UAL2454 ORD → LGA Jul 19, 16:00 UTCJul 19, 19:50 UTC3h 50m
2026-07-19 UAL1712 EWR → DFW Jul 19, 10:55 UTCJul 19, 13:50 UTC2h 55m
2026-07-18 UAL2381 - Jul 18, 23:25 UTCJul 18, 23:55 UTC30m
2026-07-18 UAL2381 - Jul 18, 14:55 UTCJul 18, 20:15 UTC5h 20m
2026-07-18 UAL594 DEN → PHX Jul 18, 06:25 UTCJul 18, 06:55 UTC30m
2026-07-18 UAL2095 - Jul 18, 01:39 UTCJul 18, 04:30 UTC2h 51m
2026-07-18 UAL2095 IAH → LAX Jul 18, 01:40 UTCJul 18, 04:24 UTC2h 44m
2026-07-17 UAL668 - Jul 17, 19:45 UTCJul 18, 00:00 UTC4h 15m
2026-07-17 UAL1556 - Jul 17, 18:00 UTCJul 17, 18:25 UTC25m
2026-07-17 UAL1556 - Jul 17, 15:05 UTCJul 17, 15:49 UTC45m
2026-07-17 UAL1289 - Jul 17, 10:20 UTCJul 17, 11:45 UTC1h 25m
2026-07-17 UAL2796 - Jul 17, 02:30 UTCJul 17, 03:55 UTC1h 25m
2026-07-16 UAL2691 - Jul 16, 21:55 UTCJul 17, 00:20 UTC2h 25m
2026-07-16 UAL1511 EWR → MIA Jul 16, 17:10 UTCJul 16, 19:30 UTC2h 20m
2026-07-16 UAL2330 - Jul 16, 12:14 UTCJul 16, 14:45 UTC2h 30m
2026-07-15 UAL1907 EWR → FLL Jul 15, 22:30 UTCJul 16, 00:45 UTC2h 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 N47457 page for operator, model, and routing details .

Mode-S A5D31D frequently asked

What is Mode-S code A5D31D?
A5D31D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N47457.
Where is Mode-S A5D31D registered?
Mode-S code A5D31D 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 A5D31D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5D31D, octal 51351435, decimal 10,867,485.
What flights does A5D31D operate?
Mode-S A5D31D has broadcast 20 distinct callsigns, including BOE123, BOE957, UAL454, UAL2381, UAL2339.