Apparatus

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sensors Mode-S transponder

A448F6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N37514 · BOEING 737 MAX 9 · operated by UNITED AIRLINES INC

Hex
A448F6
Octal
51044366
Decimal
10,766,582
Country
US
Tail
N37514
Type
B39M
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
461
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S A448F6.

Country allocation

The ICAO 24-bit address A448F6 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
UAL413 - 7 2026-06-24
UAL2223 United Airlines 6 2026-05-29
UAL731 United Airlines 5 2026-07-26
UAL1321 United Airlines 5 2026-07-26
UAL1177 - 5 2026-07-12
UAL432 - 4 2026-07-14
UAL2078 United Airlines 4 2026-06-30
UAL1783 United Airlines 4 2026-06-05
UAL1740 United Airlines 4 2026-05-30
UAL1668 - 4 2026-07-15
UAL1640 United Airlines 4 2026-05-30
UAL1556 - 4 2026-07-13
UAL1053 - 4 2026-07-12
UAL723 United Airlines 3 2026-07-03
UAL693 - 3 2026-06-27
UAL668 - 3 2026-07-13
UAL583 United Airlines 3 2026-06-07
UAL503 United Airlines 3 2026-06-09
UAL2464 United Airlines 3 2026-04-15
UAL2452 United Airlines 3 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1321 MIA → EWR Jul 26, 20:55 UTCJul 26, 21:30 UTC35m
2026-07-26 UAL1321 MIA → EWR Jul 26, 17:10 UTCJul 26, 17:20 UTC10m
2026-07-26 UAL731 TPA → SFO Jul 26, 07:15 UTCJul 26, 07:25 UTC10m
2026-07-26 UAL731 TPA → SFO Jul 26, 02:20 UTCJul 26, 03:10 UTC50m
2026-07-25 UAL1948 IAH → SFO Jul 25, 18:30 UTCJul 25, 23:20 UTC4h 50m
2026-07-25 UAL1052 EWR → CUN Jul 25, 13:05 UTCJul 25, 16:35 UTC3h 30m
2026-07-25 UAL1052 EWR → CUN Jul 25, 13:05 UTCJul 25, 16:34 UTC3h 29m
2026-07-25 UAL1652 YVR → EWR Jul 25, 06:35 UTCJul 25, 11:00 UTC4h 25m
2026-07-24 UAL1423 YVR → SFO Jul 24, 21:30 UTCJul 25, 02:55 UTC5h 25m
2026-07-24 UAL1611 LAX → SFO Jul 24, 17:15 UTCJul 24, 19:45 UTC2h 30m
2026-07-24 UAL1611 LAX → SFO Jul 24, 17:04 UTCJul 24, 19:40 UTC2h 36m
2026-07-24 UAL2444 EWR → FLL Jul 24, 13:10 UTCJul 24, 15:40 UTC2h 30m
2026-07-24 UAL2219 SJU → EWR Jul 24, 09:10 UTCJul 24, 10:40 UTC1h 30m
2026-07-24 UAL2219 SJU → EWR Jul 24, 06:50 UTCJul 24, 07:00 UTC10m
2026-07-24 UAL1543 EWR → SJU Jul 24, 03:30 UTCJul 24, 03:50 UTC20m
2026-07-24 UAL1543 EWR → SJU Jul 24, 00:25 UTCJul 24, 01:20 UTC55m
2026-07-24 UAL1543 EWR → SJU Jul 24, 00:13 UTCJul 24, 03:50 UTC3h 37m
2026-07-23 UAL620 STI → EWR Jul 23, 20:30 UTCJul 23, 22:25 UTC1h 55m
2026-07-23 UAL2452 SFO → BNA Jul 23, 13:46 UTCJul 23, 17:32 UTC3h 46m
2026-07-23 UAL2452 SFO → BNA Jul 23, 13:45 UTCJul 23, 15:35 UTC1h 50m
2026-07-23 UAL427 BOS → ORD Jul 23, 05:45 UTCJul 23, 10:25 UTC4h 40m
2026-07-23 UAL2407 TPA → EWR Jul 23, 01:50 UTCJul 23, 04:25 UTC2h 35m
2026-07-22 UAL1019 CUN → IAH Jul 22, 20:45 UTCJul 22, 23:00 UTC2h 15m
2026-07-22 UAL1019 CUN → IAH Jul 22, 20:43 UTCJul 22, 22:48 UTC2h 5m
2026-07-22 UAL1016 IAH → CUN Jul 22, 17:20 UTCJul 22, 19:15 UTC1h 55m
2026-07-22 UAL1016 IAH → CUN Jul 22, 17:12 UTCJul 22, 19:10 UTC1h 58m
2026-07-22 UAL2611 LAX → SFO Jul 22, 13:35 UTCJul 22, 15:30 UTC1h 55m
2026-07-22 UAL2323 ORD → MCO Jul 22, 02:10 UTCJul 22, 04:10 UTC2h 0m
2026-07-21 UAL1528 ORD → SFO Jul 21, 19:30 UTCJul 21, 23:35 UTC4h 5m
2026-07-21 UAL2259 LAX → EWR Jul 21, 16:05 UTCJul 21, 17:45 UTC1h 40m
2026-07-21 UAL1724 KOA → SFO Jul 21, 12:40 UTCJul 21, 13:30 UTC50m
2026-07-21 UAL1724 KOA → SFO Jul 21, 09:00 UTCJul 21, 09:10 UTC10m
2026-07-21 UAL1723 SBA → SFO Jul 21, 05:05 UTCJul 21, 05:20 UTC15m
2026-07-21 UAL1723 SBA → SFO Jul 21, 00:25 UTCJul 21, 00:55 UTC30m
2026-07-21 UAL1723 SBA → SFO Jul 21, 00:21 UTCJul 21, 05:21 UTC5h 0m
2026-07-20 UAL1321 MIA → EWR Jul 20, 20:50 UTCJul 20, 21:40 UTC50m
2026-07-20 UAL1321 MIA → EWR Jul 20, 17:00 UTCJul 20, 17:15 UTC15m
2026-07-20 UAL731 - Jul 20, 07:20 UTCJul 20, 07:35 UTC15m
2026-07-20 UAL731 SFO → KOA Jul 20, 02:32 UTCJul 20, 07:32 UTC5h 0m
2026-07-20 UAL731 - Jul 20, 02:30 UTCJul 20, 02:55 UTC25m
2026-07-19 UAL2862 SFO → DEN Jul 19, 19:05 UTCJul 20, 00:00 UTC4h 55m
2026-07-19 UAL2862 SFO → DEN Jul 19, 19:12 UTCJul 19, 23:56 UTC4h 44m
2026-07-19 UAL2826 - Jul 19, 16:10 UTCJul 19, 17:35 UTC1h 25m
2026-07-19 UAL2084 ORD → SFO Jul 19, 12:50 UTCJul 19, 14:20 UTC1h 30m
2026-07-18 UAL1873 - Jul 18, 16:10 UTCJul 18, 21:10 UTC5h 0m
2026-07-17 UAL1938 IAD → PHX Jul 17, 22:15 UTCJul 18, 02:25 UTC4h 10m
2026-07-17 UAL1938 IAD → PHX Jul 17, 22:14 UTCJul 18, 02:20 UTC4h 6m
2026-07-17 UAL1742 SMF → IAD Jul 17, 15:15 UTCJul 17, 19:55 UTC4h 40m
2026-07-16 UAL2435 IAD → SMF Jul 16, 22:10 UTCJul 17, 02:54 UTC4h 45m
2026-07-16 UAL2065 - Jul 16, 17:40 UTCJul 16, 19:20 UTC1h 40m

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 N37514 page for operator, model, and routing details .

Mode-S A448F6 frequently asked

What is Mode-S code A448F6?
A448F6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N37514.
Where is Mode-S A448F6 registered?
Mode-S code A448F6 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 A448F6 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A448F6, octal 51044366, decimal 10,766,582.
What flights does A448F6 operate?
Mode-S A448F6 has broadcast 20 distinct callsigns, including UAL413, UAL2223, UAL731, UAL1321, UAL1177.