Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A441F5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N37348 · operated by UNITED AIRLINES INC

Hex
A441F5
Octal
51040765
Decimal
10,764,789
Country
US
Tail
N37348
Type
B38M
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
443
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S A441F5.

Country allocation

The ICAO 24-bit address A441F5 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
UAL1271 United Airlines 7 2026-07-23
UAL8170 United Airlines 6 2026-04-13
UAL1433 - 6 2026-07-05
UAL700 - 5 2026-07-12
UAL1432 United Airlines 5 2026-07-06
UAL1138 United Airlines 5 2026-04-26
UAL840 - 4 2026-07-13
UAL417 United Airlines 4 2026-04-26
UAL2316 United Airlines 4 2026-04-28
UAL2043 United Airlines 4 2026-05-03
UAL1566 United Airlines 4 2026-04-18
UAL1352 United Airlines 4 2026-06-11
UAL1272 United Airlines 4 2026-07-24
UAL1257 United Airlines 4 2026-06-04
UAL784 United Airlines 3 2026-06-19
UAL574 United Airlines 3 2026-07-24
UAL559 United Airlines 3 2026-05-22
UAL477 - 3 2026-07-13
UAL462 - 3 2026-04-13
UAL450 - 3 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1245 EWR → DFW Jul 26, 20:45 UTCJul 26, 21:15 UTC30m
2026-07-26 UAL1244 MSP → SFO Jul 26, 14:50 UTCJul 26, 17:05 UTC2h 15m
2026-07-26 UAL1244 MSP → SFO Jul 26, 14:58 UTCJul 26, 18:08 UTC3h 10m
2026-07-26 UAL1552 FLL → EWR Jul 26, 06:40 UTCJul 26, 13:05 UTC6h 25m
2026-07-26 UAL1656 ORD → CUN Jul 26, 00:35 UTCJul 26, 04:35 UTC4h 0m
2026-07-25 UAL2823 IAD → EWR Jul 25, 22:20 UTCJul 25, 23:20 UTC1h 0m
2026-07-25 UAL571 AUS → SFO Jul 25, 19:20 UTCJul 25, 20:25 UTC1h 5m
2026-07-25 UAL369 BOS → EWR Jul 25, 12:15 UTCJul 25, 17:25 UTC5h 10m
2026-07-24 UAL2386 EWR → TPA Jul 24, 21:50 UTCJul 25, 02:20 UTC4h 30m
2026-07-24 UAL574 LAS → SFO Jul 24, 19:00 UTCJul 24, 20:15 UTC1h 15m
2026-07-24 UAL2382 IAH → PHL Jul 24, 16:25 UTCJul 24, 17:35 UTC1h 10m
2026-07-24 UAL643 KOA → SFO Jul 24, 13:20 UTCJul 24, 14:30 UTC1h 10m
2026-07-24 UAL2839 TPA → SFO Jul 24, 06:33 UTCJul 24, 07:40 UTC1h 7m
2026-07-24 UAL2839 TPA → SFO Jul 24, 06:40 UTCJul 24, 07:45 UTC1h 5m
2026-07-24 UAL1272 LAX → SFO Jul 24, 00:10 UTCJul 24, 03:55 UTC3h 45m
2026-07-23 UAL1271 SFO → MEX Jul 23, 18:35 UTCJul 23, 20:25 UTC1h 50m
2026-07-23 UAL1372 SFO → LAS Jul 23, 15:40 UTCJul 23, 16:40 UTC1h 0m
2026-07-23 UAL1372 SFO → LAS Jul 23, 15:19 UTCJul 23, 16:29 UTC1h 10m
2026-07-23 UAL2220 ORD → MIA Jul 23, 12:00 UTCJul 23, 12:40 UTC40m
2026-07-23 UAL2623 SFO → OGG Jul 23, 02:15 UTCJul 23, 02:25 UTC10m
2026-07-22 UAL2623 SFO → OGG Jul 22, 21:20 UTCJul 22, 21:55 UTC35m
2026-07-22 UAL267 BOS → DEN Jul 22, 14:05 UTCJul 22, 19:40 UTC5h 35m
2026-07-22 UAL2854 EWR → BZN Jul 22, 10:20 UTCJul 22, 11:45 UTC1h 25m
2026-07-21 UAL368 EWR → FLL Jul 21, 22:15 UTCJul 22, 03:30 UTC5h 15m
2026-07-21 UAL1678 SFO → DCA Jul 21, 15:35 UTCJul 21, 20:50 UTC5h 15m
2026-07-21 UAL1272 LAX → SFO Jul 21, 02:15 UTCJul 21, 04:20 UTC2h 5m
2026-07-21 UAL1272 LAX → SFO Jul 21, 00:20 UTCJul 21, 00:30 UTC10m
2026-07-20 UAL1271 SFO → MEX Jul 20, 22:20 UTCJul 20, 22:35 UTC15m
2026-07-20 UAL1271 SFO → MEX Jul 20, 18:45 UTCJul 20, 20:40 UTC1h 55m
2026-07-20 UAL1271 SFO → MEX Jul 20, 18:50 UTCJul 20, 22:36 UTC3h 46m
2026-07-20 UAL611 CHS → EWR Jul 20, 12:35 UTCJul 20, 17:10 UTC4h 35m
2026-07-20 UAL649 SFO → EWR Jul 20, 06:15 UTCJul 20, 11:15 UTC5h 0m
2026-07-20 UAL628 OGG → SFO Jul 20, 00:03 UTCJul 20, 04:46 UTC4h 43m
2026-07-19 UAL573 DEN → SFO Jul 19, 17:55 UTCJul 19, 18:40 UTC45m
2026-07-19 UAL1685 - Jul 19, 14:55 UTCJul 19, 15:40 UTC45m
2026-07-19 UAL1684 SFO → LIH Jul 19, 04:55 UTCJul 19, 05:45 UTC50m
2026-07-19 UAL1763 SFO → AUS Jul 19, 02:40 UTCJul 19, 03:15 UTC35m
2026-07-19 UAL1763 SFO → AUS Jul 19, 02:35 UTCJul 19, 03:35 UTC1h 0m
2026-07-18 UAL1626 ORD → DEN Jul 18, 19:50 UTCJul 19, 00:55 UTC5h 5m
2026-07-18 UAL1753 - Jul 18, 14:20 UTCJul 18, 15:30 UTC1h 10m
2026-07-17 UAL1975 EWR → RDU Jul 17, 21:22 UTCJul 17, 22:19 UTC57m
2026-07-17 UAL1975 EWR → RDU Jul 17, 21:10 UTCJul 17, 22:25 UTC1h 15m
2026-07-17 UAL269 - Jul 17, 15:15 UTCJul 17, 17:40 UTC2h 25m
2026-07-17 UAL269 - Jul 17, 12:30 UTCJul 17, 12:40 UTC10m
2026-07-17 UAL209 - Jul 17, 05:20 UTCJul 17, 09:15 UTC3h 55m
2026-07-16 UAL1645 - Jul 16, 22:55 UTCJul 17, 01:25 UTC2h 30m
2026-07-16 UAL1970 - Jul 16, 19:45 UTCJul 16, 21:40 UTC1h 55m
2026-07-16 UAL1970 MCO → CLE Jul 16, 19:19 UTCJul 16, 21:34 UTC2h 15m
2026-07-16 UAL2396 EWR → MCO Jul 16, 15:35 UTCJul 16, 17:35 UTC2h 0m
2026-07-16 UAL1041 TPA → EWR Jul 16, 11:21 UTCJul 16, 13:34 UTC2h 13m

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 N37348 page for operator, model, and routing details .

Mode-S A441F5 frequently asked

What is Mode-S code A441F5?
A441F5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N37348.
Where is Mode-S A441F5 registered?
Mode-S code A441F5 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 A441F5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A441F5, octal 51040765, decimal 10,764,789.
What flights does A441F5 operate?
Mode-S A441F5 has broadcast 20 distinct callsigns, including UAL1271, UAL8170, UAL1433, UAL700, UAL1432.