Apparatus

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sensors Mode-S transponder

A449A1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N37560 · BOEING 737 MAX 9 · operated by UNITED AIRLINES INC

Hex
A449A1
Octal
51044641
Decimal
10,766,753
Country
US
Tail
N37560
Type
B39M
Broadcasting now · callsign UAL432 · 14,975 ft
Flights observed
370
Distinct callsigns
20
Country
US
Last broadcast
3d ago

Current position

A449A1 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A449A1 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
UAL641 United Airlines 4 2026-06-11
UAL392 - 4 2026-07-03
UAL2360 United Airlines 4 2026-05-28
UAL2054 - 4 2026-06-24
UAL1167 United Airlines 4 2026-05-25
UAL1136 United Airlines 4 2026-05-25
UAL1070 - 4 2026-07-05
UAL2400 United Airlines 3 2026-05-05
UAL2356 - 3 2026-06-12
UAL2002 - 3 2026-07-15
UAL1983 United Airlines 3 2026-07-26
UAL1730 - 3 2026-06-30
UAL1724 United Airlines 3 2026-05-08
UAL1718 United Airlines 3 2026-05-07
UAL1659 - 3 2026-07-10
UAL1603 - 3 2026-07-15
UAL1425 - 3 2026-07-03
UAL1385 United Airlines 3 2026-07-21
UAL1358 United Airlines 3 2026-07-26
UAL1219 - 3 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1983 MIA → ORD Jul 26, 16:45 UTCJul 26, 19:35 UTC2h 50m
2026-07-26 UAL1358 EWR → ATL Jul 26, 12:30 UTCJul 26, 14:55 UTC2h 25m
2026-07-26 UAL2229 EWR → SRQ Jul 26, 00:25 UTCJul 26, 02:45 UTC2h 20m
2026-07-25 UAL688 IAD → BOS Jul 25, 21:45 UTCJul 25, 22:50 UTC1h 5m
2026-07-25 UAL1873 ORD → MSN Jul 25, 16:25 UTCJul 25, 20:25 UTC4h 0m
2026-07-24 UAL1938 RSW → EWR Jul 24, 22:44 UTCJul 25, 03:05 UTC4h 21m
2026-07-24 UAL1938 RSW → EWR Jul 24, 23:00 UTCJul 25, 03:10 UTC4h 10m
2026-07-24 UAL1694 CUN → IAD Jul 24, 16:20 UTCJul 24, 19:20 UTC3h 0m
2026-07-24 UAL1619 - Jul 24, 13:10 UTCJul 24, 15:00 UTC1h 50m
2026-07-24 UAL2379 ORF → EWR Jul 24, 07:25 UTCJul 24, 11:10 UTC3h 45m
2026-07-24 UAL2456 LAX → EWR Jul 24, 01:50 UTCJul 24, 05:40 UTC3h 50m
2026-07-23 UAL668 SJU → IAH Jul 23, 21:05 UTCJul 23, 23:45 UTC2h 40m
2026-07-23 UAL668 SJU → IAH Jul 23, 19:25 UTCJul 23, 19:40 UTC15m
2026-07-23 UAL1556 PHX → SFO Jul 23, 14:15 UTCJul 23, 18:00 UTC3h 45m
2026-07-23 UAL8132 YYZ → CLE Jul 23, 07:40 UTCJul 23, 12:15 UTC4h 35m
2026-07-22 UAL2624 LGA → DEN Jul 22, 22:40 UTCJul 23, 04:05 UTC5h 25m
2026-07-22 UAL2371 DFW → SFO Jul 22, 17:25 UTCJul 22, 20:35 UTC3h 10m
2026-07-22 UAL1644 SJU → IAH Jul 22, 13:00 UTCJul 22, 15:30 UTC2h 30m
2026-07-22 UAL1644 SJU → IAH Jul 22, 11:15 UTCJul 22, 11:25 UTC10m
2026-07-21 UAL2377 - Jul 21, 23:15 UTCJul 22, 02:10 UTC2h 55m
2026-07-21 UAL2460 SAT → IAH Jul 21, 17:55 UTCJul 21, 20:45 UTC2h 50m
2026-07-21 UAL654 AUS → IAD Jul 21, 13:00 UTCJul 21, 15:55 UTC2h 55m
2026-07-21 UAL1385 JAC → DEN Jul 21, 02:50 UTCJul 21, 07:30 UTC4h 40m
2026-07-21 UAL1385 JAC → DEN Jul 21, 02:37 UTCJul 21, 07:22 UTC4h 45m
2026-07-20 UAL1648 AUA → IAD Jul 20, 21:05 UTCJul 21, 01:10 UTC4h 4m
2026-07-20 UAL1804 - Jul 20, 14:55 UTCJul 20, 19:00 UTC4h 5m
2026-07-20 UAL491 BZN → DEN Jul 20, 08:20 UTCJul 20, 11:10 UTC2h 50m
2026-07-16 UAL1756 - Jul 16, 13:49 UTCJul 16, 14:29 UTC40m
2026-07-16 UAL374 - Jul 16, 02:05 UTCJul 16, 02:35 UTC30m
2026-07-15 UAL2610 - Jul 15, 21:50 UTCJul 15, 22:40 UTC50m
2026-07-15 UAL2002 BOS → SFO Jul 15, 13:55 UTCJul 15, 19:30 UTC5h 35m
2026-07-15 UAL1665 SFO → BOS Jul 15, 06:35 UTCJul 15, 11:45 UTC5h 10m
2026-07-15 UAL1603 LAS → SFO Jul 15, 02:40 UTCJul 15, 04:05 UTC1h 25m
2026-07-14 UAL1168 EWR → LAS Jul 14, 19:05 UTCJul 14, 23:20 UTC4h 14m
2026-07-14 UAL1219 DFW → EWR Jul 14, 12:35 UTCJul 14, 15:40 UTC3h 5m
2026-07-13 UAL2856 EWR → DFW Jul 13, 23:20 UTCJul 14, 02:15 UTC2h 55m
2026-07-13 UAL681 - Jul 13, 14:35 UTCJul 13, 21:25 UTC6h 50m
2026-07-13 UAL1105 MCO → EWR Jul 13, 10:40 UTCJul 13, 12:55 UTC2h 15m
2026-07-13 UAL1190 EWR → MCO Jul 13, 01:50 UTCJul 13, 04:00 UTC2h 10m
2026-07-13 UAL1190 EWR → MCO Jul 13, 01:43 UTCJul 13, 03:59 UTC2h 16m
2026-07-12 UAL485 ORD → EWR Jul 12, 22:15 UTCJul 13, 00:10 UTC1h 55m
2026-07-12 UAL1983 - Jul 12, 17:01 UTCJul 12, 19:55 UTC2h 55m
2026-07-12 UAL1358 ORD → MIA Jul 12, 12:25 UTCJul 12, 14:50 UTC2h 25m
2026-07-12 UAL747 SEA → ORD Jul 12, 06:25 UTCJul 12, 09:45 UTC3h 20m
2026-07-12 UAL747 SEA → ORD Jul 12, 06:26 UTCJul 12, 09:34 UTC3h 8m
2026-07-12 UAL360 DEN → SEA Jul 12, 02:10 UTCJul 12, 04:30 UTC2h 20m
2026-07-11 UAL287 - Jul 11, 19:55 UTCJul 11, 23:45 UTC3h 50m
2026-07-11 UAL8105 - Jul 11, 16:35 UTCJul 11, 18:20 UTC1h 45m
2026-07-10 UAL1667 CUN → ORD Jul 10, 21:00 UTCJul 11, 00:25 UTC3h 25m
2026-07-10 UAL1659 ORD → CUN Jul 10, 15:55 UTCJul 10, 19:25 UTC3h 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 N37560 page for operator, model, and routing details .

Mode-S A449A1 frequently asked

What is Mode-S code A449A1?
A449A1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N37560.
Where is Mode-S A449A1 registered?
Mode-S code A449A1 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 A449A1 broadcasting right now?
Yes. Mode-S A449A1 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A449A1, octal 51044641, decimal 10,766,753.
What flights does A449A1 operate?
Mode-S A449A1 has broadcast 20 distinct callsigns, including UAL641, UAL392, UAL2360, UAL2054, UAL1167.