Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A5D2D4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N47434 · BOEING 737 MAX 9 · operated by UNITED AIRLINES INC

Hex
A5D2D4
Octal
51351324
Decimal
10,867,412
Country
US
Tail
N47434
Type
B39M
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
463
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S A5D2D4.

Country allocation

The ICAO 24-bit address A5D2D4 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
UAL2372 United Airlines 8 2026-07-24
UAL2428 - 6 2026-07-11
UAL1251 United Airlines 6 2026-07-23
UAL727 United Airlines 5 2026-05-31
UAL2373 United Airlines 5 2026-07-23
UAL1804 - 5 2026-07-10
UAL787 United Airlines 4 2026-04-23
UAL693 United Airlines 4 2026-06-13
UAL686 United Airlines 4 2026-05-04
UAL552 - 4 2026-06-16
UAL2620 United Airlines 4 2026-04-18
UAL2390 United Airlines 4 2026-07-23
UAL2125 United Airlines 4 2026-06-09
UAL1581 United Airlines 4 2026-06-15
UAL1572 United Airlines 4 2026-06-16
UAL1511 United Airlines 4 2026-04-16
UAL1449 - 4 2026-07-17
UAL639 United Airlines 3 2026-07-22
UAL638 United Airlines 3 2026-05-06
UAL583 United Airlines 3 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL668 SJU → IAH Jul 26, 20:50 UTCJul 26, 23:00 UTC2h 10m
2026-07-26 UAL668 SJU → IAH Jul 26, 19:10 UTCJul 26, 19:25 UTC15m
2026-07-26 UAL1556 PHX → SFO Jul 26, 17:25 UTCJul 26, 17:50 UTC25m
2026-07-26 UAL1556 PHX → SFO Jul 26, 14:20 UTCJul 26, 15:05 UTC45m
2026-07-26 UAL2828 AMS → SFO Jul 26, 10:18 UTCJul 26, 11:43 UTC1h 25m
2026-07-26 UAL2828 AMS → SFO Jul 26, 10:10 UTCJul 26, 11:45 UTC1h 35m
2026-07-26 UAL2291 IAH → ATL Jul 26, 01:45 UTCJul 26, 03:25 UTC1h 40m
2026-07-25 UAL1440 GCM → EWR Jul 25, 19:54 UTCJul 25, 23:08 UTC3h 14m
2026-07-25 UAL1440 GCM → EWR Jul 25, 15:10 UTCJul 25, 23:15 UTC8h 5m
2026-07-25 UAL1044 EWR → DEN Jul 25, 10:25 UTCJul 25, 12:35 UTC2h 10m
2026-07-24 UAL2377 DEN → AUS Jul 24, 22:35 UTCJul 25, 01:35 UTC3h 0m
2026-07-24 UAL2460 SAT → IAH Jul 24, 18:00 UTCJul 24, 20:45 UTC2h 45m
2026-07-24 UAL654 AUS → IAD Jul 24, 13:00 UTCJul 24, 16:05 UTC3h 5m
2026-07-24 UAL2372 LGA → IAH Jul 24, 03:15 UTCJul 24, 03:55 UTC40m
2026-07-23 UAL2372 LGA → IAH Jul 23, 23:11 UTCJul 24, 03:51 UTC4h 40m
2026-07-23 UAL2372 LGA → IAH Jul 23, 23:05 UTCJul 23, 23:15 UTC10m
2026-07-23 UAL2373 LAX → KOA Jul 23, 21:25 UTCJul 23, 21:30 UTC5m
2026-07-23 UAL2373 LAX → KOA Jul 23, 16:15 UTCJul 23, 16:45 UTC30m
2026-07-23 UAL1251 PHX → SFO Jul 23, 13:10 UTCJul 23, 13:50 UTC40m
2026-07-23 UAL1251 PHX → SFO Jul 23, 09:10 UTCJul 23, 09:25 UTC15m
2026-07-23 UAL2390 DEN → SFO Jul 23, 01:55 UTCJul 23, 07:20 UTC5h 25m
2026-07-22 UAL8260 SBA → DEN Jul 22, 17:50 UTCJul 22, 20:35 UTC2h 45m
2026-07-22 UAL8260 SBA → DEN Jul 22, 17:54 UTCJul 22, 20:32 UTC2h 38m
2026-07-22 UAL654 AUS → IAD Jul 22, 13:00 UTCJul 22, 16:00 UTC3h 0m
2026-07-22 UAL639 DEN → MSO Jul 22, 02:30 UTCJul 22, 05:25 UTC2h 55m
2026-07-21 UAL1783 SFO → AUS Jul 21, 19:40 UTCJul 22, 00:30 UTC4h 50m
2026-07-21 UAL1093 - Jul 21, 12:20 UTCJul 21, 14:05 UTC1h 45m
2026-07-21 UAL2339 - Jul 21, 02:00 UTCJul 21, 03:45 UTC1h 45m
2026-07-20 UAL2078 - Jul 20, 20:25 UTCJul 21, 00:00 UTC3h 35m
2026-07-20 UAL1882 TPA → SFO Jul 20, 15:15 UTCJul 20, 18:25 UTC3h 10m
2026-07-20 UAL1882 TPA → SFO Jul 20, 15:24 UTCJul 20, 18:24 UTC3h 0m
2026-07-20 UAL537 - Jul 20, 12:10 UTCJul 20, 13:25 UTC1h 15m
2026-07-20 UAL8194 EWR → BOS Jul 20, 01:55 UTCJul 20, 03:05 UTC1h 10m
2026-07-19 UAL1216 EWR → ATL Jul 19, 21:50 UTCJul 20, 00:10 UTC2h 20m
2026-07-19 UAL410 LAX → LAS Jul 19, 17:25 UTCJul 19, 19:00 UTC1h 35m
2026-07-19 UAL410 LAX → LAS Jul 19, 17:21 UTCJul 19, 19:56 UTC2h 35m
2026-07-19 UAL2417 - Jul 19, 13:00 UTCJul 19, 15:10 UTC2h 10m
2026-07-18 UAL2785 EWR → HNL Jul 18, 11:10 UTCJul 18, 13:40 UTC2h 30m
2026-07-17 UAL279 - Jul 17, 23:45 UTCJul 18, 02:19 UTC2h 35m
2026-07-17 UAL279 FLL → EWR Jul 17, 23:14 UTCJul 18, 02:16 UTC3h 2m
2026-07-17 UAL651 - Jul 17, 17:44 UTCJul 17, 20:25 UTC2h 40m
2026-07-17 UAL1449 AUS → EWR Jul 17, 12:25 UTCJul 17, 15:49 UTC3h 25m
2026-07-17 UAL1449 AUS → EWR Jul 17, 12:19 UTCJul 17, 15:46 UTC3h 27m
2026-07-17 UAL2645 EWR → AUS Jul 17, 01:15 UTCJul 17, 04:20 UTC3h 5m
2026-07-16 UAL1831 IAD → EWR Jul 16, 22:30 UTCJul 16, 23:10 UTC40m
2026-07-16 UAL1071 - Jul 16, 15:30 UTCJul 16, 20:09 UTC4h 40m
2026-07-16 UAL2407 - Jul 16, 01:40 UTCJul 16, 04:20 UTC2h 40m
2026-07-16 UAL2407 IAH → SAN Jul 16, 01:40 UTCJul 16, 04:17 UTC2h 37m
2026-07-15 UAL1387 - Jul 15, 19:50 UTCJul 15, 23:15 UTC3h 25m
2026-07-15 UAL2855 MCO → SFO Jul 15, 12:25 UTCJul 15, 17:30 UTC5h 5m

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 N47434 page for operator, model, and routing details .

Mode-S A5D2D4 frequently asked

What is Mode-S code A5D2D4?
A5D2D4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N47434.
Where is Mode-S A5D2D4 registered?
Mode-S code A5D2D4 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 A5D2D4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5D2D4, octal 51351324, decimal 10,867,412.
What flights does A5D2D4 operate?
Mode-S A5D2D4 has broadcast 20 distinct callsigns, including UAL2372, UAL2428, UAL1251, UAL727, UAL2373.