Apparatus

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sensors Mode-S transponder

A5D643

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N47512 · BOEING 737 MAX 9 · operated by UNITED AIRLINES INC

Hex
A5D643
Octal
51353103
Decimal
10,868,291
Country
US
Tail
N47512
Type
B39M
No current signal · last broadcast Jul 26, 01:50 UTC
Flights observed
438
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 01:50 UTC

Last known position

Most recent position reported by Mode-S A5D643.

Country allocation

The ICAO 24-bit address A5D643 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
UAL1276 United Airlines 9 2026-06-10
UAL1468 United Airlines 7 2026-05-09
UAL1441 United Airlines 7 2026-05-09
UAL2863 United Airlines 5 2026-05-14
UAL1133 United Airlines 5 2026-06-10
UAL427 - 4 2026-07-16
UAL2690 - 4 2026-07-16
UAL1987 - 4 2026-06-20
UAL1148 United Airlines 4 2026-05-10
UAL1040 - 4 2026-06-18
UAL742 - 3 2026-07-12
UAL684 - 3 2026-04-13
UAL590 - 3 2026-06-30
UAL404 - 3 2026-07-17
UAL2855 United Airlines 3 2026-06-26
UAL2673 United Airlines 3 2026-05-20
UAL2458 - 3 2026-07-01
UAL2431 United Airlines 3 2026-07-21
UAL2404 United Airlines 3 2026-04-26
UAL2223 United Airlines 3 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 UAL1964 IAD → SEA Jul 25, 22:05 UTCJul 26, 01:50 UTC3h 45m
2026-07-25 UAL1711 SFO → CLE Jul 25, 17:55 UTCJul 25, 20:40 UTC2h 45m
2026-07-25 UAL574 LAS → SFO Jul 25, 13:05 UTCJul 25, 16:15 UTC3h 10m
2026-07-25 UAL1640 EWR → CHS Jul 25, 05:05 UTCJul 25, 10:30 UTC5h 25m
2026-07-24 UAL2223 CPT → IAD Jul 24, 21:50 UTCJul 25, 03:45 UTC5h 55m
2026-07-24 UAL2223 CPT → IAD Jul 24, 16:40 UTCJul 24, 19:00 UTC2h 20m
2026-07-24 UAL2326 ORD → TPA Jul 24, 13:00 UTCJul 24, 15:10 UTC2h 10m
2026-07-24 UAL2326 ORD → TPA Jul 24, 13:04 UTCJul 24, 15:05 UTC2h 1m
2026-07-24 UAL1640 EWR → CHS Jul 24, 05:25 UTCJul 24, 10:40 UTC5h 15m
2026-07-23 UAL2223 CPT → IAD Jul 23, 21:50 UTCJul 24, 03:55 UTC6h 5m
2026-07-23 UAL1215 EWR → SRQ Jul 23, 15:45 UTCJul 23, 17:35 UTC1h 50m
2026-07-23 UAL2622 LAX → ORD Jul 23, 12:30 UTCJul 23, 14:15 UTC1h 45m
2026-07-23 UAL2229 EWR → SRQ Jul 23, 00:45 UTCJul 23, 03:00 UTC2h 15m
2026-07-22 UAL2356 BUR → SFO Jul 22, 17:20 UTCJul 22, 22:15 UTC4h 55m
2026-07-22 UAL2661 PHL → ORD Jul 22, 11:10 UTCJul 22, 15:55 UTC4h 45m
2026-07-21 UAL2431 FLL → EWR Jul 21, 19:15 UTCJul 21, 23:50 UTC4h 35m
2026-07-21 UAL2367 PIT → SFO Jul 21, 11:25 UTCJul 21, 13:30 UTC2h 5m
2026-07-21 UAL301 ORD → DSM Jul 21, 04:15 UTCJul 21, 06:25 UTC2h 10m
2026-07-21 UAL1656 ORD → CUN Jul 21, 01:15 UTCJul 21, 02:45 UTC1h 30m
2026-07-21 UAL1656 ORD → CUN Jul 21, 01:14 UTCJul 21, 02:42 UTC1h 28m
2026-07-20 UAL2851 BUR → SFO Jul 20, 22:40 UTCJul 20, 23:50 UTC1h 10m
2026-07-20 UAL2428 - Jul 20, 19:25 UTCJul 20, 20:30 UTC1h 5m
2026-07-20 UAL1930 IAD → SAN Jul 20, 12:45 UTCJul 20, 17:10 UTC4h 25m
2026-07-20 UAL264 SEA → IAD Jul 20, 06:45 UTCJul 20, 11:00 UTC4h 15m
2026-07-19 UAL326 IAD → SEA Jul 19, 22:55 UTCJul 20, 04:00 UTC5h 5m
2026-07-19 UAL1742 SMF → IAD Jul 19, 16:20 UTCJul 19, 20:45 UTC4h 25m
2026-07-19 UAL8191 PHL → YYZ Jul 19, 03:08 UTCJul 19, 08:15 UTC5h 7m
2026-07-19 UAL8191 PHL → YYZ Jul 19, 03:00 UTCJul 19, 08:15 UTC5h 15m
2026-07-18 UAL1905 - Jul 18, 06:35 UTCJul 18, 11:15 UTC4h 40m
2026-07-18 UAL1904 EWR → SFO Jul 18, 00:25 UTCJul 18, 04:35 UTC4h 11m
2026-07-17 UAL1466 - Jul 17, 18:34 UTCJul 17, 19:55 UTC1h 20m
2026-07-17 UAL1465 - Jul 17, 12:04 UTCJul 17, 13:20 UTC1h 15m
2026-07-17 UAL1465 EWR → PLS Jul 17, 12:09 UTCJul 17, 15:07 UTC2h 58m
2026-07-17 UAL404 - Jul 17, 00:20 UTCJul 17, 03:14 UTC2h 55m
2026-07-16 UAL2690 EWR → IAH Jul 16, 18:35 UTCJul 16, 21:26 UTC2h 51m
2026-07-16 UAL2690 - Jul 16, 18:29 UTCJul 16, 21:35 UTC3h 5m
2026-07-16 UAL2394 BOS → EWR Jul 16, 15:14 UTCJul 16, 16:05 UTC50m
2026-07-16 UAL2394 BOS → EWR Jul 16, 15:12 UTCJul 16, 15:59 UTC47m
2026-07-16 UAL1110 EWR → BOS Jul 16, 12:55 UTCJul 16, 13:34 UTC40m
2026-07-16 UAL427 SAN → EWR Jul 16, 05:50 UTCJul 16, 10:40 UTC4h 50m
2026-07-16 UAL427 SAN → EWR Jul 16, 05:45 UTCJul 16, 10:45 UTC5h 0m
2026-07-15 UAL2054 IAD → SAN Jul 15, 22:25 UTCJul 16, 03:00 UTC4h 35m
2026-07-15 UAL1873 - Jul 15, 16:15 UTCJul 15, 20:20 UTC4h 5m
2026-07-14 UAL1938 IAD → PHX Jul 14, 22:15 UTCJul 15, 02:05 UTC3h 49m
2026-07-14 UAL2065 MCO → IAD Jul 14, 17:45 UTCJul 14, 19:40 UTC1h 55m
2026-07-14 UAL379 IAD → MCO Jul 14, 13:15 UTCJul 14, 14:55 UTC1h 40m
2026-07-14 UAL498 PDX → IAD Jul 14, 06:40 UTCJul 14, 11:15 UTC4h 35m
2026-07-13 UAL780 IAD → PDX Jul 13, 21:55 UTCJul 14, 02:35 UTC4h 40m
2026-07-13 UAL1694 - Jul 13, 16:25 UTCJul 13, 19:30 UTC3h 5m
2026-07-13 UAL1619 - Jul 13, 13:00 UTCJul 13, 14:50 UTC1h 50m

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 N47512 page for operator, model, and routing details .

Mode-S A5D643 frequently asked

What is Mode-S code A5D643?
A5D643 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N47512.
Where is Mode-S A5D643 registered?
Mode-S code A5D643 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 A5D643 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 01:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5D643, octal 51353103, decimal 10,868,291.
What flights does A5D643 operate?
Mode-S A5D643 has broadcast 20 distinct callsigns, including UAL1276, UAL1468, UAL1441, UAL2863, UAL1133.