clarkvision.com Website Information
Daily Unique Visits: 7,830
Daily Page Views: 39,150
Income Per Day: $98
Estimated Value: $58,800
This website is located in United States and is using following IP address 65.102.236.250. See the complete list of popular websites hosted in United States.
clarkvision.com is registered under .COM top-level domain. Please check other sites in .COM zone.
Website clarkvision.com is using the following name servers:
- ns87.worldnic.com
- ns88.worldnic.com
and is probably hosted by CENTURYLINK-US-LEGACY-QWEST - Qwest Communications Company, LLC, US. See the full list of other websites hosted by CENTURYLINK-US-LEGACY-QWEST - Qwest Communications Company, LLC, US.
The highest website clarkvision.com position in Alexa rank database was 75901 and the lowest rank position was 998999. Current position of clarkvision.com in Alexa rank database is 174021.
Desktop speed score of clarkvision.com (84/100) is better than the results of 78.07% of other sites and shows that the page is performing great on desktop computers.
Mobile usability score of clarkvision.com (57/100) is better than the results of 1.03% of other sites and means that the page is not mobile-friendly.
Mobile speed score of clarkvision.com (84/100) is better than the results of 90.19% of other sites and shows that the landing page performance on mobile devices is excellent.
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clarkvision.com Alexa Rank
The traffic rank is based on three months of aggregated historical traffic data from millions of Alexa Toolbar users and is a combined measure of page views and users.
clarkvision.com whois
WHOIS gives you the ability to lookup any generic domains to find out the registered domain holder. WHOIS database are provided for information purposes only. It allows the public to check whether a specific domain name is still available or not and to obtain information related to the registration records of existing domain names.
Domain Name: CLARKVISION.COM
Registry Domain ID: 78880195_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.networksolutions.com
Registrar URL: http://networksolutions.com
Updated Date: 2023-11-09T01:18:43Z
Creation Date: 2001-10-23T04:03:22Z
Registry Expiry Date: 2032-10-23T04:03:22Z
Registrar: Network Solutions, LLC
Registrar IANA ID: 2
Registrar Abuse Contact Email: domain.operations@web.com
Registrar Abuse Contact Phone: +1.8777228662
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Name Server: NS87.WORLDNIC.COM
Name Server: NS88.WORLDNIC.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2024-10-19T00:56:59Z
Registry Domain ID: 78880195_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.networksolutions.com
Registrar URL: http://networksolutions.com
Updated Date: 2023-11-09T01:18:43Z
Creation Date: 2001-10-23T04:03:22Z
Registry Expiry Date: 2032-10-23T04:03:22Z
Registrar: Network Solutions, LLC
Registrar IANA ID: 2
Registrar Abuse Contact Email: domain.operations@web.com
Registrar Abuse Contact Phone: +1.8777228662
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Name Server: NS87.WORLDNIC.COM
Name Server: NS88.WORLDNIC.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2024-10-19T00:56:59Z
clarkvision.com server information
Servers Location
clarkvision.com desktop page speed rank
Last tested: 2018-12-27
Desktop Speed
Medium
84/100
clarkvision.com Desktop Speed Test Quick Summary
priority - 16Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 153.7KiB (19% reduction).
Compressing http://clarkvision.com/galleries/images.astrophoto…v101.h-1546x1034vs.jpg could save 152KiB (19% reduction).
Compressing http://clarkvision.com/roger.photo/calib_bar1a.gif could save 1.7KiB (81% reduction).
Compressing http://clarkvision.com/roger.photo/calib_bar1a.gif could save 1.7KiB (81% reduction).
priority - 1Leverage browser caching
Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.
Leverage browser caching for the following cacheable resources:
http://clarkvision.com/galleries/images.astrophoto…v101.h-1546x1034vs.jpg (expiration not specified)
http://clarkvision.com/roger.photo/calib_bar1a.gif (expiration not specified)
http://clarkvision.com/roger.photo/calib_bar1a.gif (expiration not specified)
clarkvision.com Desktop Resource Breakdown
| Total Resources | 3 |
| Number of Hosts | 1 |
| Static Resources | 2 |
clarkvision.com mobile page speed rank
Last tested: 2018-12-27
Mobile Speed
Medium
84/100
clarkvision.com Mobile Speed Test Quick Summary
priority - 16Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 153.7KiB (19% reduction).
Compressing http://clarkvision.com/galleries/images.astrophoto…v101.h-1546x1034vs.jpg could save 152KiB (19% reduction).
Compressing http://clarkvision.com/roger.photo/calib_bar1a.gif could save 1.7KiB (81% reduction).
Compressing http://clarkvision.com/roger.photo/calib_bar1a.gif could save 1.7KiB (81% reduction).
priority - 2Leverage browser caching
Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.
Leverage browser caching for the following cacheable resources:
http://clarkvision.com/galleries/images.astrophoto…v101.h-1546x1034vs.jpg (expiration not specified)
http://clarkvision.com/roger.photo/calib_bar1a.gif (expiration not specified)
http://clarkvision.com/roger.photo/calib_bar1a.gif (expiration not specified)
clarkvision.com Mobile Resource Breakdown
| Total Resources | 3 |
| Number of Hosts | 1 |
| Static Resources | 2 |
clarkvision.com mobile page usability
Last tested: 2018-12-27
Mobile Usability
Bad
57/100
clarkvision.com Mobile Usability Test Quick Summary
priority - 33Size content to viewport
The page content is too wide for the viewport, forcing the user to scroll horizontally. Size the page content to the viewport to provide a better user experience.
The page content is 1,570 CSS pixels wide, but the viewport is only 980 CSS pixels wide. The following elements fall outside the viewport:
The element
<img src="/galleries/ima…546x1034vs.jpg"> falls outside the viewport.priority - 29Use legible font sizes
The following text on your page renders in a way that may be difficult for some of your visitors to read. Use legible font sizes to provide a better user experience.
The following text fragments have a small font size. Increase the font size to make them more legible.
Home and 17 others render only 6 pixels tall (16 CSS pixels).Spiral Perseid…acobini-Zinner renders only 6 pixels tall (16 CSS pixels).They may not b…oger N. Clark. and 2 others render only 6 pixels tall (16 CSS pixels).Images on this…r calibration. and 3 others render only 6 pixels tall (16 CSS pixels).Roger N. Clark…reduce spam): renders only 6 pixels tall (16 CSS pixels).the server clarkvision.com and 1 others render only 6 pixels tall (16 CSS pixels).at renders only 6 pixels tall (16 CSS pixels).This site is a…red per month. and 6 others render only 6 pixels tall (16 CSS pixels).December Dece…5.9 6.4 renders only 6 pixels tall (16 CSS pixels).New articles R…ded or Updated and 2 others render only 6 pixels tall (16 CSS pixels)..) renders only 6 pixels tall (16 CSS pixels).priority - 10Configure the viewport
Your page does not have a viewport specified. This causes mobile devices to render your page as it would appear on a desktop browser, scaling it down to fit on a mobile screen. Configure a viewport to allow your page to render properly on all devices.
priority - 8Size tap targets appropriately
Some of the links/buttons on your webpage may be too small for a user to easily tap on a touchscreen. Consider making these tap targets larger to provide a better user experience.
The following tap targets are close to other nearby tap targets and may need additional spacing around them.
The tap target
<a href="/index.html">Home</a> and 8 others are close to other tap targets.The tap target
<a href="/galleries/gal…46x1034vs.html">Spiral Perseid…acobini-Zinner</a> is close to 1 other tap targets.The tap target
<a href="/articles/astr…h-rawtherapee/">Astrophotograp…th RawTherapee</a> and 1 others are close to other tap targets.The tap target
<a href="copyright.html">All images, te…ghts reserved.</a> is close to 1 other tap targets.The tap target
<a href="/rnc/press.releases/">See: Press rel…es under about</a> and 1 others are close to other tap targets.clarkvision.com HTML validation
Errors
Start tag seen without seeing a doctype first. Expected “<!DOCTYPE html>”.
Line: 1 Column: 1 - 6
"...<HEAD> <m..."
"...<HEAD> <m..."
The “bgcolor” attribute on the “body” element is obsolete. Use CSS instead.
Line: 12 Column: 1 - 70
"...> </HEAD> <body bgcolor="#BFBFBF" text="#000000" link="0000CC" vlink="#000099" alink="#BB0000"> <H1 A..."
"...> </HEAD> <body bgcolor="#BFBFBF" text="#000000" link="0000CC" vlink="#000099" alink="#BB0000"> <H1 A..."
The “text” attribute on the “body” element is obsolete. Use CSS instead.
Line: 12 Column: 1 - 70
"...> </HEAD> <body bgcolor="#BFBFBF" text="#000000" link="0000CC" vlink="#000099" alink="#BB0000"> <H1 A..."
"...> </HEAD> <body bgcolor="#BFBFBF" text="#000000" link="0000CC" vlink="#000099" alink="#BB0000"> <H1 A..."
The “link” attribute on the “body” element is obsolete. Use CSS instead.
Line: 12 Column: 1 - 70
"...> </HEAD> <body bgcolor="#BFBFBF" text="#000000" link="0000CC" vlink="#000099" alink="#BB0000"> <H1 A..."
"...> </HEAD> <body bgcolor="#BFBFBF" text="#000000" link="0000CC" vlink="#000099" alink="#BB0000"> <H1 A..."
The “vlink” attribute on the “body” element is obsolete. Use CSS instead.
Line: 12 Column: 1 - 70
"...> </HEAD> <body bgcolor="#BFBFBF" text="#000000" link="0000CC" vlink="#000099" alink="#BB0000"> <H1 A..."
"...> </HEAD> <body bgcolor="#BFBFBF" text="#000000" link="0000CC" vlink="#000099" alink="#BB0000"> <H1 A..."
The “alink” attribute on the “body” element is obsolete. Use CSS instead.
Line: 12 Column: 1 - 70
"...> </HEAD> <body bgcolor="#BFBFBF" text="#000000" link="0000CC" vlink="#000099" alink="#BB0000"> <H1 A..."
"...> </HEAD> <body bgcolor="#BFBFBF" text="#000000" link="0000CC" vlink="#000099" alink="#BB0000"> <H1 A..."
The “align” attribute on the “h1” element is obsolete. Use CSS instead.
Line: 13 Column: 1 - 19
"...#BB0000"> <H1 ALIGN="CENTER"> <B> ..."
"...#BB0000"> <H1 ALIGN="CENTER"> <B> ..."
The “clear” attribute on the “br” element is obsolete. Use CSS instead.
Line: 14 Column: 23 - 32
"...sion.com <BR CLEAR></B> <..." Line: 56 Column: 58 - 67
"...r1a.gif" ><br clear> Image..."
"...sion.com <BR CLEAR></B> <..." Line: 56 Column: 58 - 67
"...r1a.gif" ><br clear> Image..."
The “center” element is obsolete. Use CSS instead.
Line: 17 Column: 1 - 8
"...B> </H1> <center> <tabl..." Line: 44 Column: 1 - 8
".../center> <center> <P> <..." Line: 53 Column: 1 - 8
".../center> <center> <TABL..." Line: 56 Column: 10 - 17
"... <TR><TD> <center><img s..." Line: 65 Column: 1 - 8
".../center> <center> <P> <..."
"...B> </H1> <center> <tabl..." Line: 44 Column: 1 - 8
".../center> <center> <P> <..." Line: 53 Column: 1 - 8
".../center> <center> <TABL..." Line: 56 Column: 10 - 17
"... <TR><TD> <center><img s..." Line: 65 Column: 1 - 8
".../center> <center> <P> <..."
The “width” attribute on the “table” element is obsolete. Use CSS instead.
Line: 18 Column: 1 - 26
"... <center> <table border=0 width=815> <tr><..." Line: 96 Column: 1 - 26
"...nter> <P> <table border=0 width=815> <tr><..."
"... <center> <table border=0 width=815> <tr><..." Line: 96 Column: 1 - 26
"...nter> <P> <table border=0 width=815> <tr><..."
The “border” attribute on the “table” element is obsolete. Use CSS instead.
Line: 18 Column: 1 - 26
"... <center> <table border=0 width=815> <tr><..." Line: 54 Column: 1 - 14
"... <center> <TABLE BORDER> <TR>..." Line: 96 Column: 1 - 26
"...nter> <P> <table border=0 width=815> <tr><..."
"... <center> <table border=0 width=815> <tr><..." Line: 54 Column: 1 - 14
"... <center> <TABLE BORDER> <TR>..." Line: 96 Column: 1 - 26
"...nter> <P> <table border=0 width=815> <tr><..."
The “align” attribute on the “td” element is obsolete. Use CSS instead.
Line: 19 Column: 5 - 23
"...=815> <tr><td align="center"> <A H..." Line: 20 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 21 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 22 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 23 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 24 Column: 79 - 24
"... </A></td> <td align="center"> <A HR..." Line: 25 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 26 Column: 78 - 24
"... </A></td> <td align="center"> <A H..." Line: 27 Column: 79 - 24
"... </A></td> <td align="center"> <A H..." Line: 97 Column: 5 - 23
"...=815> <tr><td align="center"> <A H..." Line: 98 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 99 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 100 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 101 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 102 Column: 79 - 24
"... </A></td> <td align="center"> <A HR..." Line: 103 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 104 Column: 78 - 24
"... </A></td> <td align="center"> <A H..." Line: 105 Column: 79 - 24
"... </A></td> <td align="center"> <A H..."
"...=815> <tr><td align="center"> <A H..." Line: 20 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 21 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 22 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 23 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 24 Column: 79 - 24
"... </A></td> <td align="center"> <A HR..." Line: 25 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 26 Column: 78 - 24
"... </A></td> <td align="center"> <A H..." Line: 27 Column: 79 - 24
"... </A></td> <td align="center"> <A H..." Line: 97 Column: 5 - 23
"...=815> <tr><td align="center"> <A H..." Line: 98 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 99 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 100 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 101 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 102 Column: 79 - 24
"... </A></td> <td align="center"> <A HR..." Line: 103 Column: 78 - 24
"... </A></td> <td align="center"> <A HR..." Line: 104 Column: 78 - 24
"... </A></td> <td align="center"> <A H..." Line: 105 Column: 79 - 24
"... </A></td> <td align="center"> <A H..."
Bad value “8” for attribute “border” on element “img”: Only “0” is a permitted zero literal.
Line: 34 Column: 1 - 136
"...0s.html"> <img src="/galleries/images.nightscapes/web/mittens.dawn.rnc2014.05.03.IMG_1886-94.g-1400s.jpg" align="center" BORDER=8 width=1482 height=1075 ALT="image mittens.dawn.rnc2014.05.03.IMG_1886-94.g-1400s.jpg` is Copyrighted by Roger N. Clark, www.clarkvision.com"> <BR> ..."
"...0s.html"> <img src="/galleries/images.nightscapes/web/mittens.dawn.rnc2014.05.03.IMG_1886-94.g-1400s.jpg" align="center" BORDER=8 width=1482 height=1075 ALT="image mittens.dawn.rnc2014.05.03.IMG_1886-94.g-1400s.jpg` is Copyrighted by Roger N. Clark, www.clarkvision.com"> <BR> ..."
The “align” attribute on the “img” element is obsolete. Use CSS instead.
Line: 34 Column: 1 - 136
"...0s.html"> <img src="/galleries/images.nightscapes/web/mittens.dawn.rnc2014.05.03.IMG_1886-94.g-1400s.jpg" align="center" BORDER=8 width=1482 height=1075 ALT="image mittens.dawn.rnc2014.05.03.IMG_1886-94.g-1400s.jpg` is Copyrighted by Roger N. Clark, www.clarkvision.com"> <BR> ..."
"...0s.html"> <img src="/galleries/images.nightscapes/web/mittens.dawn.rnc2014.05.03.IMG_1886-94.g-1400s.jpg" align="center" BORDER=8 width=1482 height=1075 ALT="image mittens.dawn.rnc2014.05.03.IMG_1886-94.g-1400s.jpg` is Copyrighted by Roger N. Clark, www.clarkvision.com"> <BR> ..."
End tag “i” violates nesting rules.
Line: 50 Column: 21 - 24
"... reserved.</I></B></..."
"... reserved.</I></B></..."
No “a” element in scope but a “a” end tag seen.
Line: 50 Column: 29 - 32
"...d.</I></B></A> </cen..."
"...d.</I></B></A> </cen..."
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Line: 56 Column: 18 - 57
"...> <center><img src="roger.photo/calib_bar1a.gif" ><br cl..."
"...> <center><img src="roger.photo/calib_bar1a.gif" ><br cl..."
The “font” element is obsolete. Use CSS instead.
Line: 67 Column: 1 - 22
"...nter> <P> <font color="#007700"> Roger..."
"...nter> <P> <font color="#007700"> Roger..."
Stray end tag “center”.
Line: 75 Column: 1 - 9
"...nter> <P> </center> This ..." Line: 80 Column: 1 - 9
"...onth. <P> </center> Share..." Line: 94 Column: 1 - 9
"...re> <hr> </center> <P> <..." Line: 107 Column: 1 - 9
"...></table> </center> <P> ..." Line: 120 Column: 1 - 9
".../B></A> </center> ..."
"...nter> <P> </center> This ..." Line: 80 Column: 1 - 9
"...onth. <P> </center> Share..." Line: 94 Column: 1 - 9
"...re> <hr> </center> <P> <..." Line: 107 Column: 1 - 9
"...></table> </center> <P> ..." Line: 120 Column: 1 - 9
".../B></A> </center> ..."
Element “table” not allowed as child of element “p” in this context. (Suppressing further errors from this subtree.)
Line: 96 Column: 1 - 26
"...nter> <P> <table border=0 width=815> <tr><..."
"...nter> <P> <table border=0 width=815> <tr><..."
Warnings
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Line: 34 Column: 1 - 136
"...0s.html"> <img src="/galleries/images.nightscapes/web/mittens.dawn.rnc2014.05.03.IMG_1886-94.g-1400s.jpg" align="center" BORDER=8 width=1482 height=1075 ALT="image mittens.dawn.rnc2014.05.03.IMG_1886-94.g-1400s.jpg` is Copyrighted by Roger N. Clark, www.clarkvision.com"> <BR> ..."
"...0s.html"> <img src="/galleries/images.nightscapes/web/mittens.dawn.rnc2014.05.03.IMG_1886-94.g-1400s.jpg" align="center" BORDER=8 width=1482 height=1075 ALT="image mittens.dawn.rnc2014.05.03.IMG_1886-94.g-1400s.jpg` is Copyrighted by Roger N. Clark, www.clarkvision.com"> <BR> ..."
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clarkvision.com Ping
Ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol (IP) network. It measures the round-trip time for messages sent from the originating host to a destination computer that are echoed back to the source.
clarkvision.com TRACEROUTE
Traceroute is a computer network diagnostic tool for displaying the route (path) and measuring transit delays of packets across an Internet Protocol (IP) network. The history of the route is recorded as the round-trip times of the packets received from each successive host (remote node) in the route (path); the sum of the mean times in each hop is a measure of the total time spent to establish the connection. Traceroute proceeds unless all (three) sent packets are lost more than twice, then the connection is lost and the route cannot be evaluated.