Apparatus

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sensors Mode-S transponder

A445F0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N37466 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A445F0
Octal
51042760
Decimal
10,765,808
Country
US
Tail
N37466
Type
B739
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
427
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S A445F0.

Country allocation

The ICAO 24-bit address A445F0 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
UAL444 United Airlines 6 2026-07-21
UAL2175 United Airlines 6 2026-04-17
UAL2136 - 6 2026-07-21
UAL375 - 5 2026-07-07
UAL2290 - 5 2026-07-16
UAL1957 United Airlines 5 2026-07-20
UAL1501 - 5 2026-07-07
UAL450 United Airlines 4 2026-05-07
UAL414 - 4 2026-07-07
UAL1745 United Airlines 4 2026-06-02
UAL779 United Airlines 3 2026-05-19
UAL776 United Airlines 3 2026-05-17
UAL686 United Airlines 3 2026-07-12
UAL682 United Airlines 3 2026-05-31
UAL655 United Airlines 3 2026-04-17
UAL635 - 3 2026-06-20
UAL605 United Airlines 3 2026-06-03
UAL600 United Airlines 3 2026-04-15
UAL572 United Airlines 3 2026-04-14
UAL524 United Airlines 3 2026-04-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1621 LAX → MCO Jul 26, 17:40 UTCJul 26, 22:00 UTC4h 20m
2026-07-26 UAL2113 EWR → ATL Jul 26, 11:05 UTCJul 26, 15:25 UTC4h 20m
2026-07-26 UAL1190 MCO → EWR Jul 26, 02:05 UTCJul 26, 04:10 UTC2h 5m
2026-07-25 UAL583 LGA → IAH Jul 25, 22:20 UTCJul 26, 00:35 UTC2h 15m
2026-07-25 UAL2215 FLL → EWR Jul 25, 17:15 UTCJul 25, 19:20 UTC2h 5m
2026-07-25 UAL1227 PHX → IAD Jul 25, 13:20 UTCJul 25, 15:25 UTC2h 5m
2026-07-24 UAL1932 ORD → LGA Jul 24, 22:50 UTCJul 25, 01:00 UTC2h 10m
2026-07-24 UAL1643 RIC → DEN Jul 24, 18:50 UTCJul 24, 21:05 UTC2h 15m
2026-07-24 UAL1739 EWR → MCO Jul 24, 14:20 UTCJul 24, 16:30 UTC2h 10m
2026-07-24 UAL1739 EWR → MCO Jul 24, 14:23 UTCJul 24, 16:25 UTC2h 2m
2026-07-24 UAL2673 ORD → LGA Jul 24, 11:00 UTCJul 24, 12:50 UTC1h 50m
2026-07-24 UAL2335 LAX → EWR Jul 24, 01:45 UTCJul 24, 03:40 UTC1h 55m
2026-07-23 UAL485 LAS → EWR Jul 23, 22:30 UTCJul 24, 00:00 UTC1h 30m
2026-07-23 UAL2784 GUM → SFO Jul 23, 17:45 UTCJul 23, 19:25 UTC1h 40m
2026-07-23 UAL2752 ORD → PHL Jul 23, 14:50 UTCJul 23, 16:15 UTC1h 25m
2026-07-23 UAL2672 DEN → MSN Jul 23, 10:15 UTCJul 23, 12:25 UTC2h 10m
2026-07-22 UAL516 SFO → LAX Jul 22, 23:50 UTCJul 23, 01:15 UTC1h 25m
2026-07-22 UAL440 - Jul 22, 18:55 UTCJul 22, 21:50 UTC2h 55m
2026-07-22 UAL2137 ORD → SLC Jul 22, 13:55 UTCJul 22, 17:25 UTC3h 30m
2026-07-22 UAL2333 ORD → SFO Jul 22, 11:10 UTCJul 22, 12:25 UTC1h 15m
2026-07-21 UAL2362 LGA → ORD Jul 21, 23:50 UTCJul 22, 01:45 UTC1h 55m
2026-07-21 UAL1180 - Jul 21, 14:30 UTCJul 21, 22:15 UTC7h 45m
2026-07-21 UAL2672 - Jul 21, 10:15 UTCJul 21, 12:20 UTC2h 5m
2026-07-21 UAL444 BNA → IAD Jul 21, 03:15 UTCJul 21, 04:05 UTC50m
2026-07-21 UAL2136 BOS → IAD Jul 21, 00:00 UTCJul 21, 01:10 UTC1h 10m
2026-07-20 UAL1957 PHL → IAH Jul 20, 17:55 UTCJul 20, 21:15 UTC3h 20m
2026-07-20 UAL2608 - Jul 20, 13:10 UTCJul 20, 15:50 UTC2h 40m
2026-07-20 UAL2242 ORD → SFO Jul 20, 01:47 UTCJul 20, 04:38 UTC2h 51m
2026-07-20 UAL2242 ORD → SFO Jul 20, 01:30 UTCJul 20, 04:40 UTC3h 10m
2026-07-19 UAL1010 OMA → SFO Jul 19, 20:55 UTCJul 19, 23:25 UTC2h 30m
2026-07-19 UAL1834 DFW → EWR Jul 19, 16:50 UTCJul 19, 19:00 UTC2h 10m
2026-07-19 UAL1834 DFW → EWR Jul 19, 12:40 UTCJul 19, 15:00 UTC2h 20m
2026-07-18 UAL2161 - Jul 18, 22:25 UTCJul 19, 01:45 UTC3h 20m
2026-07-18 UAL1397 - Jul 18, 14:20 UTCJul 18, 17:20 UTC3h 0m
2026-07-18 UAL2240 - Jul 18, 00:39 UTCJul 18, 02:29 UTC1h 50m
2026-07-17 UAL2120 EWR → DEN Jul 17, 19:00 UTCJul 17, 22:25 UTC3h 25m
2026-07-17 UAL2204 TPA → EWR Jul 17, 13:25 UTCJul 17, 15:44 UTC2h 20m
2026-07-16 UAL1544 - Jul 16, 23:40 UTCJul 17, 01:59 UTC2h 20m
2026-07-16 UAL606 ORD → EWR Jul 16, 17:49 UTCJul 16, 19:20 UTC1h 30m
2026-07-16 UAL2290 - Jul 16, 13:49 UTCJul 16, 16:05 UTC2h 15m
2026-07-16 UAL2828 SAV → EWR Jul 16, 10:25 UTCJul 16, 12:05 UTC1h 40m
2026-07-16 UAL2291 EWR → SAV Jul 16, 02:15 UTCJul 16, 03:45 UTC1h 30m
2026-07-15 UAL2359 - Jul 15, 20:25 UTCJul 16, 01:00 UTC4h 35m
2026-07-15 UAL1247 DEN → PDX Jul 15, 17:10 UTCJul 15, 19:15 UTC2h 5m
2026-07-15 UAL557 - Jul 15, 13:25 UTCJul 15, 14:30 UTC1h 5m
2026-07-15 UAL1417 - Jul 15, 01:55 UTCJul 15, 03:00 UTC1h 5m
2026-07-14 UAL2757 - Jul 14, 20:40 UTCJul 14, 23:40 UTC2h 59m
2026-07-14 UAL1003 - Jul 14, 16:15 UTCJul 14, 19:15 UTC3h 0m
2026-07-14 UAL1232 SLC → DEN Jul 14, 13:30 UTCJul 14, 14:35 UTC1h 5m
2026-07-14 UAL2769 DEN → SLC Jul 14, 01:50 UTCJul 14, 02:50 UTC1h 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 N37466 page for operator, model, and routing details .

Mode-S A445F0 frequently asked

What is Mode-S code A445F0?
A445F0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N37466.
Where is Mode-S A445F0 registered?
Mode-S code A445F0 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 A445F0 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A445F0, octal 51042760, decimal 10,765,808.
What flights does A445F0 operate?
Mode-S A445F0 has broadcast 20 distinct callsigns, including UAL444, UAL2175, UAL2136, UAL375, UAL2290.