Apparatus

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sensors Mode-S transponder

A44169

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N37308 · BOEING 737 MAX 8 · operated by UMB BANK NA TRUSTEE

Hex
A44169
Octal
51040551
Decimal
10,764,649
Country
US
Tail
N37308
Type
B38M
No current signal · last broadcast Jul 26, 21:00 UTC
Flights observed
458
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:00 UTC

Last known position

Most recent position reported by Mode-S A44169.

Country allocation

The ICAO 24-bit address A44169 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
UAL2224 - 7 2026-06-26
UAL1450 - 6 2026-06-26
UAL834 - 5 2026-07-11
UAL763 United Airlines 4 2026-05-19
UAL643 - 4 2026-07-16
UAL453 United Airlines 4 2026-04-16
UAL2748 - 4 2026-07-16
UAL2412 United Airlines 4 2026-06-13
UAL2015 - 4 2026-06-26
UAL1763 - 4 2026-07-10
UAL1456 United Airlines 4 2026-05-30
UAL1306 United Airlines 4 2026-05-27
UAL1257 United Airlines 4 2026-04-17
UAL841 United Airlines 3 2026-05-16
UAL700 United Airlines 3 2026-06-29
UAL598 United Airlines 3 2026-05-22
UAL488 United Airlines 3 2026-04-17
UAL394 - 3 2026-06-28
UAL327 United Airlines 3 2026-04-23
UAL2677 United Airlines 3 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2677 CLE → DEN Jul 26, 16:40 UTCJul 26, 20:55 UTC4h 15m
2026-07-26 UAL2646 DEN → SJC Jul 26, 10:30 UTCJul 26, 14:55 UTC4h 25m
2026-07-25 UAL1386 LAS → EWR Jul 25, 23:35 UTCJul 26, 03:55 UTC4h 20m
2026-07-25 UAL1864 DEN → IAH Jul 25, 16:45 UTCJul 25, 21:35 UTC4h 50m
2026-07-25 UAL1864 DEN → IAH Jul 25, 16:47 UTCJul 25, 21:29 UTC4h 42m
2026-07-25 UAL1041 SAN → EWR Jul 25, 11:50 UTCJul 25, 14:05 UTC2h 15m
2026-07-24 UAL2375 PHL → ORD Jul 24, 20:10 UTCJul 24, 23:10 UTC3h 0m
2026-07-24 UAL716 CHS → DEN Jul 24, 14:15 UTCJul 24, 18:00 UTC3h 45m
2026-07-24 UAL2168 JAX → IAH Jul 24, 00:00 UTCJul 24, 03:10 UTC3h 10m
2026-07-23 UAL757 CLE → LAS Jul 23, 20:35 UTCJul 23, 22:40 UTC2h 5m
2026-07-23 UAL2271 LAX → SEA Jul 23, 16:20 UTCJul 23, 18:40 UTC2h 20m
2026-07-23 UAL2271 LAX → SEA Jul 23, 16:05 UTCJul 23, 18:46 UTC2h 41m
2026-07-23 UAL2614 LAX → EWR Jul 23, 10:05 UTCJul 23, 14:40 UTC4h 35m
2026-07-23 UAL2073 DEN → SFO Jul 23, 05:30 UTCJul 23, 08:45 UTC3h 15m
2026-07-22 UAL2073 DEN → SFO Jul 22, 23:00 UTCJul 23, 04:15 UTC5h 15m
2026-07-22 UAL8188 ORD → DEN Jul 22, 17:45 UTCJul 22, 20:40 UTC2h 55m
2026-07-22 UAL8188 ORD → DEN Jul 22, 17:32 UTCJul 22, 20:36 UTC3h 4m
2026-07-21 UAL637 MSY → DEN Jul 21, 12:55 UTCJul 21, 15:40 UTC2h 45m
2026-07-21 UAL8166 ORD → IAD Jul 21, 03:25 UTCJul 21, 04:40 UTC1h 15m
2026-07-20 UAL1182 ORD → MCI Jul 20, 21:25 UTCJul 20, 23:50 UTC2h 25m
2026-07-20 UAL1598 IAH → EWR Jul 20, 16:15 UTCJul 20, 19:50 UTC3h 35m
2026-07-20 UAL1877 IAH → EWR Jul 20, 13:30 UTCJul 20, 14:00 UTC30m
2026-07-20 UAL431 - Jul 20, 02:15 UTCJul 20, 02:50 UTC35m
2026-07-20 UAL431 DEN → GJT Jul 20, 01:50 UTCJul 20, 02:51 UTC1h 1m
2026-07-19 UAL1303 EWR → IAH Jul 19, 22:30 UTCJul 20, 00:05 UTC1h 35m
2026-07-19 UAL2290 ORD → DFW Jul 19, 18:55 UTCJul 19, 20:40 UTC1h 45m
2026-07-19 UAL2298 SFO → PHX Jul 19, 13:55 UTCJul 19, 15:50 UTC1h 55m
2026-07-19 UAL2681 DEN → SFO Jul 19, 07:05 UTCJul 19, 11:55 UTC4h 50m
2026-07-18 UAL2035 LAX → SFO Jul 18, 23:10 UTCJul 19, 04:55 UTC5h 45m
2026-07-18 UAL2035 LAX → SFO Jul 18, 22:19 UTCJul 19, 04:50 UTC6h 31m
2026-07-18 UAL1207 - Jul 18, 16:10 UTCJul 18, 21:05 UTC4h 55m
2026-07-18 UAL1207 SFO → PWM Jul 18, 15:47 UTCJul 18, 21:05 UTC5h 18m
2026-07-18 UAL1299 - Jul 18, 00:50 UTCJul 18, 05:30 UTC4h 41m
2026-07-17 UAL1298 - Jul 17, 18:05 UTCJul 17, 23:00 UTC4h 55m
2026-07-17 UAL1298 SFO → LIH Jul 17, 18:02 UTCJul 17, 23:14 UTC5h 12m
2026-07-17 UAL1301 - Jul 17, 14:24 UTCJul 17, 16:34 UTC2h 10m
2026-07-17 UAL361 AUS → DEN Jul 17, 11:10 UTCJul 17, 13:10 UTC2h 0m
2026-07-17 UAL2621 - Jul 17, 02:59 UTCJul 17, 03:30 UTC30m
2026-07-16 UAL643 - Jul 16, 22:30 UTCJul 17, 01:15 UTC2h 45m
2026-07-16 UAL2780 - Jul 16, 17:45 UTCJul 16, 20:39 UTC2h 55m
2026-07-16 UAL2748 - Jul 16, 12:14 UTCJul 16, 16:09 UTC3h 55m
2026-07-16 UAL2748 SEA → IAH Jul 16, 12:15 UTCJul 16, 16:08 UTC3h 53m
2026-07-16 UAL1796 - Jul 16, 03:50 UTCJul 16, 08:15 UTC4h 25m
2026-07-16 UAL1796 EWR → SEA Jul 16, 03:55 UTCJul 16, 08:51 UTC4h 56m
2026-07-15 UAL1317 LAS → EWR Jul 15, 22:05 UTCJul 16, 02:30 UTC4h 25m
2026-07-15 UAL446 EWR → LAS Jul 15, 15:10 UTCJul 15, 19:40 UTC4h 30m
2026-07-15 UAL2396 IAD → EWR Jul 15, 13:05 UTCJul 15, 13:50 UTC45m
2026-07-15 UAL2677 EWR → IAD Jul 15, 00:05 UTCJul 15, 00:45 UTC40m
2026-07-14 UAL348 BZN → EWR Jul 14, 17:48 UTCJul 14, 21:36 UTC3h 48m
2026-07-14 UAL348 EWR → EWR Jul 14, 12:20 UTCJul 14, 21:45 UTC9h 25m

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 N37308 page for operator, model, and routing details .

Mode-S A44169 frequently asked

What is Mode-S code A44169?
A44169 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N37308.
Where is Mode-S A44169 registered?
Mode-S code A44169 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 A44169 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A44169, octal 51040551, decimal 10,764,649.
What flights does A44169 operate?
Mode-S A44169 has broadcast 20 distinct callsigns, including UAL2224, UAL1450, UAL834, UAL763, UAL643.