Apparatus

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sensors Mode-S transponder

A44611

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N37474 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A44611
Octal
51043021
Decimal
10,765,841
Country
US
Tail
N37474
Type
B739
No current signal · last broadcast Jul 26, 20:20 UTC
Flights observed
446
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:20 UTC

Last known position

Most recent position reported by Mode-S A44611.

Country allocation

The ICAO 24-bit address A44611 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
UAL2629 - 6 2026-07-12
UAL2331 - 6 2026-07-12
UAL2206 - 6 2026-07-12
UAL2194 - 6 2026-07-15
UAL1920 - 6 2026-06-28
UAL503 United Airlines 5 2026-05-11
UAL2370 United Airlines 5 2026-06-29
UAL682 United Airlines 4 2026-06-02
UAL573 United Airlines 4 2026-05-18
UAL370 - 4 2026-06-26
UAL2741 United Airlines 4 2026-06-09
UAL2443 United Airlines 4 2026-07-21
UAL8109 - 3 2026-06-28
UAL624 United Airlines 3 2026-07-24
UAL593 United Airlines 3 2026-05-11
UAL539 United Airlines 3 2026-05-04
UAL495 United Airlines 3 2026-05-07
UAL440 - 3 2026-07-16
UAL403 United Airlines 3 2026-07-23
UAL279 United Airlines 3 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1587 RSW → EWR Jul 26, 17:00 UTCJul 26, 20:10 UTC3h 10m
2026-07-26 UAL1587 RSW → EWR Jul 26, 17:04 UTCJul 26, 20:14 UTC3h 10m
2026-07-26 UAL1279 EWR → SFO Jul 26, 12:31 UTCJul 26, 15:35 UTC3h 4m
2026-07-26 UAL1279 EWR → SFO Jul 26, 12:40 UTCJul 26, 14:15 UTC1h 35m
2026-07-25 UAL557 - Jul 25, 13:10 UTCJul 25, 14:15 UTC1h 5m
2026-07-25 UAL557 BIL → DEN Jul 25, 13:17 UTCJul 25, 14:14 UTC57m
2026-07-25 UAL1417 DEN → RDU Jul 25, 02:40 UTCJul 25, 03:40 UTC1h 0m
2026-07-24 UAL624 BTV → ORD Jul 24, 23:40 UTCJul 25, 01:20 UTC1h 40m
2026-07-24 UAL455 ORD → MSN Jul 24, 18:55 UTCJul 24, 22:00 UTC3h 5m
2026-07-24 UAL2171 GRR → DEN Jul 24, 13:25 UTCJul 24, 16:55 UTC3h 30m
2026-07-24 UAL658 AUS → EWR Jul 24, 02:00 UTCJul 24, 05:40 UTC3h 40m
2026-07-23 UAL403 LAX → ITO Jul 23, 20:55 UTCJul 23, 23:40 UTC2h 45m
2026-07-23 UAL403 LAX → ITO Jul 23, 20:40 UTCJul 23, 23:28 UTC2h 48m
2026-07-23 UAL279 CLT → EWR Jul 23, 16:20 UTCJul 23, 18:55 UTC2h 35m
2026-07-23 UAL1695 EWR → MCO Jul 23, 12:30 UTCJul 23, 14:25 UTC1h 55m
2026-07-22 UAL414 EWR → SFO Jul 22, 23:10 UTCJul 23, 00:40 UTC1h 30m
2026-07-22 UAL414 EWR → SFO Jul 22, 22:01 UTCJul 23, 00:40 UTC2h 39m
2026-07-22 UAL730 COS → DEN Jul 22, 19:35 UTCJul 22, 19:55 UTC20m
2026-07-22 UAL1111 DEN → COS Jul 22, 18:00 UTCJul 22, 18:20 UTC20m
2026-07-22 UAL703 DEN → BIL Jul 22, 14:20 UTCJul 22, 16:10 UTC1h 50m
2026-07-22 UAL1267 EWR → ANC Jul 22, 03:10 UTCJul 22, 04:15 UTC1h 5m
2026-07-21 UAL8175 YYZ → DTW Jul 21, 22:00 UTCJul 22, 01:20 UTC3h 20m
2026-07-21 UAL2443 MSN → ORD Jul 21, 18:15 UTCJul 21, 19:15 UTC1h 0m
2026-07-21 UAL2389 LGA → ORD Jul 21, 15:50 UTCJul 21, 16:40 UTC50m
2026-07-21 UAL1733 PDX → SFO Jul 21, 11:30 UTCJul 21, 13:40 UTC2h 10m
2026-07-21 UAL2443 MSN → ORD Jul 21, 01:07 UTCJul 21, 02:51 UTC1h 44m
2026-07-21 UAL2443 MSN → ORD Jul 21, 01:05 UTCJul 21, 02:55 UTC1h 50m
2026-07-20 UAL1623 EWR → AUS Jul 20, 19:50 UTCJul 20, 21:25 UTC1h 35m
2026-07-20 UAL1623 - Jul 20, 17:35 UTCJul 20, 18:05 UTC30m
2026-07-20 UAL1029 LAX → DEN Jul 20, 14:50 UTCJul 20, 16:05 UTC1h 15m
2026-07-20 UAL1937 - Jul 20, 00:30 UTCJul 20, 01:40 UTC1h 10m
2026-07-19 UAL1248 SFO → ORD Jul 19, 17:50 UTCJul 19, 22:10 UTC4h 20m
2026-07-19 UAL2360 - Jul 19, 14:00 UTCJul 19, 15:45 UTC1h 45m
2026-07-19 UAL2360 MSN → DEN Jul 19, 14:07 UTCJul 19, 15:49 UTC1h 42m
2026-07-19 UAL1894 SAT → ORD Jul 19, 00:20 UTCJul 19, 02:05 UTC1h 45m
2026-07-19 UAL1894 SAT → ORD Jul 19, 00:23 UTCJul 19, 02:09 UTC1h 46m
2026-07-18 UAL1412 TPA → EWR Jul 18, 20:20 UTCJul 18, 22:20 UTC2h 0m
2026-07-18 UAL2322 - Jul 18, 17:55 UTCJul 18, 18:45 UTC50m
2026-07-18 UAL2322 YVR → SFO Jul 18, 14:20 UTCJul 18, 16:25 UTC2h 5m
2026-07-18 UAL2191 LAX → YVR Jul 18, 02:55 UTCJul 18, 05:10 UTC2h 15m
2026-07-17 UAL684 - Jul 17, 20:04 UTCJul 18, 00:45 UTC4h 40m
2026-07-17 UAL1869 - Jul 17, 16:59 UTCJul 17, 18:25 UTC1h 25m
2026-07-17 UAL1869 ORD → IAD Jul 17, 16:36 UTCJul 17, 18:21 UTC1h 45m
2026-07-17 UAL2287 - Jul 17, 13:15 UTCJul 17, 14:24 UTC1h 10m
2026-07-17 UAL1325 - Jul 17, 01:59 UTCJul 17, 02:45 UTC45m
2026-07-16 UAL440 - Jul 16, 23:20 UTCJul 16, 23:49 UTC30m
2026-07-16 UAL440 - Jul 16, 18:55 UTCJul 16, 22:10 UTC3h 15m
2026-07-16 UAL2137 - Jul 16, 13:54 UTCJul 16, 17:00 UTC3h 5m
2026-07-16 UAL709 - Jul 16, 10:25 UTCJul 16, 12:05 UTC1h 40m
2026-07-15 UAL440 ORD → BWI Jul 15, 23:40 UTCJul 16, 01:10 UTC1h 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 N37474 page for operator, model, and routing details .

Mode-S A44611 frequently asked

What is Mode-S code A44611?
A44611 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N37474.
Where is Mode-S A44611 registered?
Mode-S code A44611 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 A44611 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A44611, octal 51043021, decimal 10,765,841.
What flights does A44611 operate?
Mode-S A44611 has broadcast 20 distinct callsigns, including UAL2629, UAL2331, UAL2206, UAL2194, UAL1920.