Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
Broadcasting now · callsign UAL498 · 34,375 ft
Flights observed
392
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

A5D643 is currently broadcasting. Map zoomed to live position.

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
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
UAL2855 United Airlines 3 2026-06-26
UAL2673 United Airlines 3 2026-05-20
UAL2458 - 3 2026-07-01
UAL2404 United Airlines 3 2026-04-26
UAL2219 - 3 2026-06-22
UAL2151 United Airlines 3 2026-07-03
UAL2131 - 3 2026-06-28
UAL2005 - 3 2026-06-16
UAL1723 United Airlines 3 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL498 - Jul 14, 06:40 UTCJul 14, 08:45 UTC2h 5m
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
2026-07-13 UAL2203 - Jul 13, 07:50 UTCJul 13, 10:15 UTC2h 25m
2026-07-12 UAL742 - Jul 12, 22:25 UTCJul 13, 00:45 UTC2h 20m
2026-07-12 UAL742 IAH → SAL Jul 12, 22:15 UTCJul 13, 00:47 UTC2h 32m
2026-07-12 UAL277 - Jul 12, 17:30 UTCJul 12, 20:30 UTC3h 0m
2026-07-12 UAL2600 - Jul 12, 12:35 UTCJul 12, 15:25 UTC2h 50m
2026-07-11 UAL1284 - Jul 11, 15:10 UTCJul 12, 00:10 UTC9h 0m
2026-07-11 UAL1246 MSP → EWR Jul 11, 11:15 UTCJul 11, 13:20 UTC2h 5m
2026-07-11 UAL1331 EWR → MSP Jul 11, 02:35 UTCJul 11, 05:10 UTC2h 35m
2026-07-11 UAL1331 EWR → MSP Jul 11, 02:20 UTCJul 11, 05:05 UTC2h 45m
2026-07-10 UAL665 STI → EWR Jul 10, 20:35 UTCJul 10, 23:46 UTC3h 11m
2026-07-10 UAL665 EWR → EWR Jul 10, 15:55 UTCJul 10, 23:40 UTC7h 45m
2026-07-10 UAL240 - Jul 10, 12:05 UTCJul 10, 13:40 UTC1h 35m
2026-07-10 UAL1489 - Jul 10, 00:10 UTCJul 10, 00:50 UTC40m
2026-07-09 UAL1489 EWR → STI Jul 9, 23:43 UTCJul 10, 03:23 UTC3h 40m
2026-07-09 UAL2392 BDA → EWR Jul 9, 18:07 UTCJul 9, 20:08 UTC2h 1m
2026-07-09 UAL2392 - Jul 9, 15:05 UTCJul 9, 20:00 UTC4h 55m
2026-07-09 UAL1105 - Jul 9, 10:40 UTCJul 9, 12:45 UTC2h 5m
2026-07-09 UAL1105 MCO → EWR Jul 9, 10:45 UTCJul 9, 12:51 UTC2h 6m
2026-07-05 UAL1571 - Jul 5, 22:25 UTCJul 6, 00:25 UTC2h 0m
2026-07-05 UAL2165 - Jul 5, 17:40 UTCJul 5, 20:20 UTC2h 40m
2026-07-05 UAL2309 SAN → SFO Jul 5, 14:20 UTCJul 5, 16:10 UTC1h 50m
2026-07-05 UAL2666 ORD → DEN Jul 5, 10:20 UTCJul 5, 12:20 UTC2h 0m
2026-07-04 UAL1667 CUN → ORD Jul 4, 20:50 UTCJul 5, 00:05 UTC3h 15m
2026-07-04 UAL1659 ORD → CUN Jul 4, 16:00 UTCJul 4, 19:20 UTC3h 20m
2026-07-03 UAL699 - Jul 3, 22:20 UTCJul 4, 00:30 UTC2h 10m
2026-07-03 UAL2638 - Jul 3, 16:30 UTCJul 3, 18:25 UTC1h 55m
2026-07-03 UAL2151 PDX → DEN Jul 3, 13:20 UTCJul 3, 14:00 UTC40m
2026-07-03 UAL2151 PDX → DEN Jul 3, 13:27 UTCJul 3, 13:47 UTC20m
2026-07-03 UAL630 ORD → MSN Jul 3, 05:50 UTCJul 3, 06:20 UTC30m
2026-07-02 UAL1400 - Jul 2, 20:40 UTCJul 2, 23:00 UTC2h 20m
2026-07-02 UAL2287 ORD → SRQ Jul 2, 16:40 UTCJul 2, 18:55 UTC2h 15m
2026-07-02 UAL2804 TPA → ORD Jul 2, 12:00 UTCJul 2, 14:25 UTC2h 25m
2026-07-01 UAL2865 SBA → DEN Jul 1, 23:29 UTCJul 2, 01:25 UTC1h 56m
2026-07-01 UAL2865 ORD → TPA Jul 1, 23:15 UTCJul 2, 01:30 UTC2h 15m
2026-07-01 UAL2458 - Jul 1, 21:00 UTCJul 1, 21:05 UTC5m
2026-07-01 UAL2458 - Jul 1, 18:55 UTCJul 1, 21:05 UTC2h 10m
2026-07-01 UAL2458 IAH → ORD Jul 1, 19:03 UTCJul 1, 20:43 UTC1h 40m
2026-07-01 UAL535 - Jul 1, 14:10 UTCJul 1, 16:10 UTC2h 0m
2026-06-30 UAL590 ORD → ORD Jun 30, 23:20 UTCJun 30, 23:25 UTC5m
2026-06-30 UAL590 - Jun 30, 21:50 UTCJun 30, 23:25 UTC1h 35m
2026-06-30 UAL590 BWI → ORD Jun 30, 21:44 UTCJun 30, 23:03 UTC1h 19m
2026-06-30 UAL1720 - Jun 30, 17:45 UTCJun 30, 20:20 UTC2h 35m
2026-06-30 UAL1720 IAH → BWI Jun 30, 17:37 UTCJun 30, 20:21 UTC2h 44m
2026-06-30 UAL1524 - Jun 30, 13:00 UTCJun 30, 15:30 UTC2h 30m
2026-06-30 UAL1252 - Jun 30, 10:05 UTCJun 30, 10:55 UTC50m
2026-06-28 UAL2131 IAD → CLE Jun 28, 02:29 UTCJun 28, 03:25 UTC55m

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?
Yes. Mode-S A5D643 is currently airborne.
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.