Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A44938

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N37530 · BOEING 737 MAX 9 · operated by WILMINGTON TRUST CO TRUSTEE

Hex
A44938
Octal
51044470
Decimal
10,766,648
Country
US
Tail
N37530
Type
B39M
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
397
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S A44938.

Country allocation

The ICAO 24-bit address A44938 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 5 2026-06-10
UAL1250 United Airlines 5 2026-07-26
UAL1031 - 5 2026-07-05
UAL609 - 4 2026-07-01
UAL370 United Airlines 4 2026-06-17
UAL2631 United Airlines 4 2026-06-11
UAL1995 United Airlines 4 2026-05-11
UAL1988 - 4 2026-06-20
UAL1039 - 4 2026-06-13
UAL1020 - 4 2026-06-20
UAL700 United Airlines 3 2026-05-04
UAL277 United Airlines 3 2026-05-26
UAL246 United Airlines 3 2026-07-23
UAL2444 United Airlines 3 2026-04-14
UAL2212 United Airlines 3 2026-06-07
UAL2137 United Airlines 3 2026-06-06
UAL2038 United Airlines 3 2026-06-11
UAL2025 United Airlines 3 2026-05-22
UAL1981 United Airlines 3 2026-06-12
UAL1904 United Airlines 3 2026-05-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1250 LAX → SFO Jul 26, 18:20 UTCJul 26, 20:00 UTC1h 40m
2026-07-26 UAL1250 LAX → SFO Jul 26, 18:17 UTCJul 26, 21:55 UTC3h 38m
2026-07-26 UAL1644 SJU → IAH Jul 26, 11:15 UTCJul 26, 15:10 UTC3h 55m
2026-07-26 UAL1644 SJU → IAH Jul 26, 11:13 UTCJul 26, 15:07 UTC3h 54m
2026-07-26 UAL1497 SFO → IAH Jul 26, 09:00 UTCJul 26, 09:10 UTC10m
2026-07-26 UAL1497 SFO → IAH Jul 26, 05:15 UTCJul 26, 07:25 UTC2h 11m
2026-07-26 UAL1497 SFO → IAH Jul 26, 05:13 UTCJul 26, 09:08 UTC3h 55m
2026-07-25 UAL2782 EWR → IAH Jul 25, 22:35 UTCJul 26, 01:30 UTC2h 55m
2026-07-25 UAL1611 LAX → SFO Jul 25, 17:10 UTCJul 25, 19:50 UTC2h 40m
2026-07-25 UAL1611 LAX → SFO Jul 25, 16:57 UTCJul 25, 19:47 UTC2h 50m
2026-07-25 UAL1825 EWR → SFO Jul 25, 13:25 UTCJul 25, 15:25 UTC2h 0m
2026-07-25 UAL1252 EWR → MIA Jul 25, 10:15 UTCJul 25, 11:15 UTC1h 0m
2026-07-25 UAL1790 EWR → MYR Jul 25, 02:10 UTCJul 25, 04:25 UTC2h 15m
2026-07-24 UAL2852 EWR → DEN Jul 24, 20:45 UTCJul 25, 00:20 UTC3h 35m
2026-07-24 UAL2295 PHX → EWR Jul 24, 15:50 UTCJul 24, 18:20 UTC2h 30m
2026-07-24 UAL2235 SAN → SFO Jul 24, 00:45 UTCJul 24, 03:15 UTC2h 30m
2026-07-23 UAL246 ORD → LGA Jul 23, 19:30 UTCJul 23, 23:35 UTC4h 5m
2026-07-23 UAL246 ORD → LGA Jul 23, 19:30 UTCJul 23, 23:34 UTC4h 4m
2026-07-23 UAL2855 EWR → SFO Jul 23, 12:15 UTCJul 23, 17:15 UTC5h 0m
2026-07-23 UAL1730 IAD → SEA Jul 23, 06:20 UTCJul 23, 10:50 UTC4h 30m
2026-07-22 UAL639 DEN → MSO Jul 22, 23:05 UTCJul 23, 04:40 UTC5h 35m
2026-07-22 UAL1783 SFO → AUS Jul 22, 15:55 UTCJul 22, 21:20 UTC5h 25m
2026-07-22 UAL1756 - Jul 22, 13:20 UTCJul 22, 14:00 UTC40m
2026-07-22 UAL374 EWR → PBI Jul 22, 01:55 UTCJul 22, 02:25 UTC30m
2026-07-21 UAL8106 SFO → LAX Jul 21, 19:40 UTCJul 21, 20:40 UTC1h 0m
2026-07-21 UAL1668 LAX → AUS Jul 21, 14:00 UTCJul 21, 17:00 UTC3h 0m
2026-07-21 UAL1943 ORD → CHS Jul 21, 04:25 UTCJul 21, 06:05 UTC1h 40m
2026-07-20 UAL1136 CUN → DEN Jul 20, 23:49 UTCJul 21, 02:48 UTC2h 59m
2026-07-20 UAL1136 CUN → DEN Jul 20, 23:35 UTCJul 21, 02:55 UTC3h 20m
2026-07-20 UAL1167 FLL → EWR Jul 20, 20:00 UTCJul 20, 22:00 UTC2h 0m
2026-07-20 UAL462 EWR → PBI Jul 20, 14:25 UTCJul 20, 18:15 UTC3h 50m
2026-07-19 UAL1964 IAD → SEA Jul 19, 22:05 UTCJul 20, 01:50 UTC3h 45m
2026-07-19 UAL2165 - Jul 19, 17:30 UTCJul 19, 20:20 UTC2h 50m
2026-07-19 UAL2309 DEN → SAN Jul 19, 13:50 UTCJul 19, 15:40 UTC1h 50m
2026-07-19 UAL2041 SFO → SAN Jul 19, 10:40 UTCJul 19, 12:10 UTC1h 30m
2026-07-19 UAL2076 DEN → MSP Jul 19, 00:15 UTCJul 19, 01:45 UTC1h 30m
2026-07-18 UAL2350 SAN → ORD Jul 18, 20:30 UTCJul 18, 22:20 UTC1h 50m
2026-07-18 UAL2153 OAK → RDM Jul 18, 17:45 UTCJul 18, 18:40 UTC55m
2026-07-18 UAL2192 - Jul 18, 10:45 UTCJul 18, 15:45 UTC5h 0m
2026-07-18 UAL1646 SFO → AUS Jul 18, 00:50 UTCJul 18, 03:45 UTC2h 56m
2026-07-18 UAL1646 SFO → AUS Jul 18, 00:53 UTCJul 18, 03:45 UTC2h 52m
2026-07-17 UAL2338 PSP → SFO Jul 17, 20:40 UTCJul 17, 22:29 UTC1h 50m
2026-07-17 UAL2368 DEN → MSN Jul 17, 17:22 UTCJul 17, 18:53 UTC1h 31m
2026-07-17 UAL2368 DEN → MSN Jul 17, 17:09 UTCJul 17, 19:00 UTC1h 50m
2026-07-17 UAL595 AUS → DEN Jul 17, 13:55 UTCJul 17, 15:35 UTC1h 40m
2026-07-17 UAL312 - Jul 17, 02:10 UTCJul 17, 04:20 UTC2h 10m
2026-07-16 UAL308 - Jul 16, 21:30 UTCJul 16, 23:25 UTC1h 55m
2026-07-16 UAL308 - Jul 16, 21:15 UTCJul 16, 21:25 UTC10m
2026-07-16 UAL2182 ORD → PHL Jul 16, 17:40 UTCJul 16, 19:10 UTC1h 30m
2026-07-16 UAL2182 - Jul 16, 12:49 UTCJul 16, 14:50 UTC2h 0m

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 N37530 page for operator, model, and routing details .

Mode-S A44938 frequently asked

What is Mode-S code A44938?
A44938 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N37530.
Where is Mode-S A44938 registered?
Mode-S code A44938 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 A44938 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 A44938, octal 51044470, decimal 10,766,648.
What flights does A44938 operate?
Mode-S A44938 has broadcast 20 distinct callsigns, including UAL641, UAL1250, UAL1031, UAL609, UAL370.