Apparatus

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sensors Mode-S transponder

A44187

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N37313 · BOEING 737 MAX 8 · operated by UMB BANK NA TRUSTEE

Hex
A44187
Octal
51040607
Decimal
10,764,679
Country
US
Tail
N37313
Type
B38M
Broadcasting now · callsign UAL1802 · 35,000 ft
Flights observed
355
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Current position

A44187 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A44187 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
UAL205 - 6 2026-06-30
UAL523 - 5 2026-07-10
UAL268 United Airlines 5 2026-06-28
UAL231 - 5 2026-07-13
UAL230 - 5 2026-07-13
UAL216 - 5 2026-07-12
UAL681 United Airlines 4 2026-06-07
UAL527 United Airlines 4 2026-06-10
UAL522 - 4 2026-07-10
UAL2601 - 4 2026-07-11
UAL217 - 4 2026-07-12
UAL2083 United Airlines 4 2026-04-26
UAL1629 - 4 2026-07-08
UAL1459 United Airlines 4 2026-04-18
UAL1455 United Airlines 4 2026-06-11
UAL1407 United Airlines 4 2026-04-17
UAL1271 United Airlines 4 2026-05-30
UAL8210 - 3 2026-06-23
UAL621 - 3 2026-07-05
UAL555 - 3 2026-04-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 UAL560 - Jul 13, 23:40 UTCJul 14, 04:30 UTC4h 50m
2026-07-13 UAL231 GLA → EWR Jul 13, 13:10 UTCJul 13, 20:00 UTC6h 50m
2026-07-13 UAL230 EWR → GLA Jul 13, 03:10 UTCJul 13, 09:20 UTC6h 10m
2026-07-12 UAL583 MCO → EWR Jul 12, 23:00 UTCJul 13, 01:20 UTC2h 20m
2026-07-12 UAL2215 EWR → MCO Jul 12, 19:25 UTCJul 12, 21:30 UTC2h 5m
2026-07-12 UAL217 - Jul 12, 15:10 UTCJul 12, 17:10 UTC2h 0m
2026-07-12 UAL217 PDL → EWR Jul 12, 11:20 UTCJul 12, 17:07 UTC5h 47m
2026-07-12 UAL216 - Jul 12, 03:25 UTCJul 12, 04:35 UTC1h 10m
2026-07-12 UAL216 EWR → PDL Jul 12, 03:22 UTCJul 12, 08:06 UTC4h 44m
2026-07-11 UAL2601 RSW → EWR Jul 11, 23:15 UTCJul 12, 01:35 UTC2h 20m
2026-07-11 UAL2601 DEN → RSW Jul 11, 23:09 UTCJul 12, 01:33 UTC2h 24m
2026-07-11 UAL2044 EWR → RSW Jul 11, 19:10 UTCJul 11, 22:05 UTC2h 55m
2026-07-11 UAL217 - Jul 11, 16:15 UTCJul 11, 17:15 UTC1h 0m
2026-07-11 UAL217 PDL → EWR Jul 11, 11:20 UTCJul 11, 17:18 UTC5h 58m
2026-07-11 UAL216 - Jul 11, 09:35 UTCJul 11, 09:45 UTC10m
2026-07-11 UAL216 - Jul 11, 05:01 UTCJul 11, 06:15 UTC1h 15m
2026-07-11 UAL216 EWR → PDL Jul 11, 04:47 UTCJul 11, 09:44 UTC4h 57m
2026-07-11 UAL2601 RSW → EWR Jul 11, 00:15 UTCJul 11, 02:55 UTC2h 40m
2026-07-10 UAL2044 EWR → RSW Jul 10, 19:10 UTCJul 10, 21:55 UTC2h 45m
2026-07-10 UAL523 FNC → EWR Jul 10, 10:16 UTCJul 10, 17:21 UTC7h 5m
2026-07-10 UAL523 FNC → EWR Jul 10, 10:15 UTCJul 10, 17:30 UTC7h 15m
2026-07-10 UAL522 - Jul 10, 01:00 UTCJul 10, 02:15 UTC1h 15m
2026-07-10 UAL522 EWR → FNC Jul 10, 00:54 UTCJul 10, 07:06 UTC6h 12m
2026-07-09 UAL2677 PHX → EWR Jul 9, 18:40 UTCJul 9, 22:45 UTC4h 5m
2026-07-09 UAL2646 EWR → PHX Jul 9, 10:49 UTCJul 9, 15:10 UTC4h 21m
2026-07-09 UAL2646 EWR → PHX Jul 9, 10:40 UTCJul 9, 15:15 UTC4h 35m
2026-07-09 UAL1997 IAD → EWR Jul 9, 02:55 UTCJul 9, 03:45 UTC50m
2026-07-09 UAL1997 IAD → EWR Jul 9, 02:44 UTCJul 9, 03:40 UTC56m
2026-07-08 UAL1223 - Jul 8, 20:20 UTCJul 9, 00:00 UTC3h 40m
2026-07-08 UAL1629 - Jul 8, 14:55 UTCJul 8, 18:10 UTC3h 15m
2026-07-08 UAL798 - Jul 8, 11:30 UTCJul 8, 12:45 UTC1h 15m
2026-07-07 UAL2104 - Jul 7, 23:40 UTCJul 8, 01:00 UTC1h 20m
2026-07-07 UAL231 - Jul 7, 13:20 UTCJul 7, 13:50 UTC30m
2026-07-07 UAL231 GLA → EWR Jul 7, 13:15 UTCJul 7, 20:17 UTC7h 2m
2026-07-07 UAL230 EWR → GLA Jul 7, 03:05 UTCJul 7, 09:15 UTC6h 10m
2026-07-06 UAL1880 - Jul 6, 18:30 UTCJul 6, 22:35 UTC4h 5m
2026-07-06 UAL346 - Jul 6, 12:55 UTCJul 6, 16:25 UTC3h 30m
2026-07-06 UAL346 IAD → SXM Jul 6, 12:48 UTCJul 6, 16:50 UTC4h 2m
2026-07-06 UAL572 - Jul 6, 04:35 UTCJul 6, 11:10 UTC6h 35m
2026-07-05 UAL1592 - Jul 5, 22:04 UTCJul 6, 02:55 UTC4h 51m
2026-07-05 UAL1592 - Jul 5, 22:00 UTCJul 6, 01:45 UTC3h 45m
2026-07-05 UAL2663 - Jul 5, 19:15 UTCJul 5, 19:45 UTC30m
2026-07-05 UAL1378 DEN → EGE Jul 5, 17:38 UTCJul 5, 17:53 UTC15m
2026-07-05 UAL1378 - Jul 5, 17:30 UTCJul 5, 17:45 UTC15m
2026-07-05 UAL621 - Jul 5, 13:00 UTCJul 5, 13:55 UTC55m
2026-07-05 UAL484 DEN → ABQ Jul 5, 01:41 UTCJul 5, 02:36 UTC55m
2026-07-05 UAL484 DEN → ABQ Jul 5, 01:45 UTCJul 5, 02:40 UTC55m
2026-07-04 UAL1876 - Jul 4, 11:55 UTCJul 4, 23:10 UTC11h 15m
2026-07-04 UAL2003 - Jul 4, 02:55 UTCJul 4, 03:50 UTC55m
2026-07-03 UAL2003 - Jul 3, 19:45 UTCJul 4, 00:15 UTC4h 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 N37313 page for operator, model, and routing details .

Mode-S A44187 frequently asked

What is Mode-S code A44187?
A44187 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N37313.
Where is Mode-S A44187 registered?
Mode-S code A44187 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 A44187 broadcasting right now?
Yes. Mode-S A44187 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A44187, octal 51040607, decimal 10,764,679.
What flights does A44187 operate?
Mode-S A44187 has broadcast 20 distinct callsigns, including UAL205, UAL523, UAL268, UAL231, UAL230.