| 1. General Results, most used to calculate the result |
| A | name "explainr.tv" is domain, public suffix is ".tv", top-level-domain is ".tv", top-level-domain-type is "country-code", Country is Tuvalu, tld-manager is "Ministry of Finance and Tourism", num .tv-domains preloaded: 194 (complete: 131120)
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| A | Good: All ip addresses are public addresses
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| Warning: Only one ip address found: explainr.tv has only one ip address.
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| Warning: Only one ip address found: www.explainr.tv has only one ip address.
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| Warning: No ipv6 address found. Ipv6 is the future with a lot of new features. So every domain name should have an ipv6 address. See https://en.wikipedia.org/wiki/IPv6: explainr.tv has no ipv6 address.
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| Warning: No ipv6 address found. Ipv6 is the future with a lot of new features. So every domain name should have an ipv6 address. See https://en.wikipedia.org/wiki/IPv6: www.explainr.tv has no ipv6 address.
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| A | Good: No asked Authoritative Name Server had a timeout
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| A | Good: destination is https
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| A | Good - only one version with Http-Status 200
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| A | Good: one preferred version: non-www is preferred
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| A | Good: No cookie sent via http.
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| A | Good: every https has a Strict Transport Security Header
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| A | Good: HSTS max-age is long enough, 63072000 seconds = 730 days
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| HSTS-Preload-Status: unknown. Domain never included in the Preload-list. Check https://hstspreload.org/ to learn some basics about the Google-Preload-List.
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| A | Good: Some urls with http status 200/404 have a complete Content-Type header (MediaType / MediaSubType + correct charset):2 complete Content-Type - header (4 urls)
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| https://explainr.tv/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de
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| Url with incomplete Content-Type - header - missing charset
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| https://www.explainr.tv/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de
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| Url with incomplete Content-Type - header - missing charset
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| A | http://explainr.tv/ 95.216.243.69
| https://explainr.tv/
| Correct redirect http - https with the same domain name
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| A | http://www.explainr.tv/ 95.216.243.69
| https://www.explainr.tv/
| Correct redirect http - https with the same domain name
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| N | https://95.216.243.69/ 95.216.243.69
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| Error - Certificate isn't trusted, RemoteCertificateNameMismatch
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| Info: Checking all ip addresses of that domain without sending the hostname only one certificate found. Checking all ip addresses and sending the hostname only one certificate found. Both certificates are different. So that domain requires Server Name Indication (SNI), so the server is able to select the correct certificate.: Domain explainr.tv, 1 ip addresses.
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| Info: Checking all ip addresses of that domain without sending the hostname only one certificate found. Checking all ip addresses and sending the hostname only one certificate found. Both certificates are different. So that domain requires Server Name Indication (SNI), so the server is able to select the correct certificate.: Domain www.explainr.tv, 1 ip addresses.
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| 2. Header-Checks |
| 3. DNS- and NameServer - Checks |
| A | Info:: 6 Root-climbing DNS Queries required to find all IPv4- and IPv6-Addresses of 3 Name Servers.
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| A | Info:: 6 Queries complete, 6 with IPv6, 0 with IPv4.
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| A | Good: All DNS Queries done via IPv6.
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| A | Good: Some ip addresses of name servers found with the minimum of two DNS Queries. One to find the TLD-Zone, one to ask the TLD-Zone.ns.udag.de (185.61.8.10, 2a00:a8e0:1::10), ns.udag.net (2a00:a8e0:2::10, 89.31.141.10), ns.udag.org (185.61.8.11, 2a00:a8e0:1::11)
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| A | Good (1 - 3.0):: An average of 2.0 queries per domain name server required to find all ip addresses of all name servers.
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| A | Info:: 3 different Name Servers found: ns.udag.de, ns.udag.net, ns.udag.org, 3 Name Servers included in Delegation: ns.udag.de, ns.udag.net, ns.udag.org, 3 Name Servers included in 1 Zone definitions: ns.udag.de, ns.udag.net, ns.udag.org, 1 Name Servers listed in SOA.Primary: ns.udag.de.
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| A | Good: Only one SOA.Primary Name Server found.: ns.udag.de.
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| A | Good: SOA.Primary Name Server included in the delegation set.: ns.udag.de.
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| A | Good: Consistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Ordered list of name servers: ns.udag.de, ns.udag.net, ns.udag.org
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| A | Good: All Name Server Domain Names have a Public Suffix.
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| A | Good: All Name Server Domain Names ending with a Public Suffix have minimal one IPv4- or IPv6 address.
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| A | Good: All Name Server ip addresses are public.
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| A | Good: Minimal 2 different name servers (public suffix and public ip address) found: 3 different Name Servers found
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| A | Good: All name servers have ipv4- and ipv6-addresses.: 3 different Name Servers found
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| A | Good: Name servers with different Top Level Domains / Public Suffix List entries found: 3 Name Servers, 3 Top Level Domains: de, org, net
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| A | Good: Name Servers with different domain names found.: 3 different Domains found
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| Warning: All Name Servers from the same Country / IP location.: 3 Name Servers, 1 Countries: DE
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| A | Info: Ipv4-Subnet-list: 3 Name Servers, 2 different subnets (first Byte): 185., 89., 2 different subnets (first two Bytes): 185.61., 89.31., 2 different subnets (first three Bytes): 185.61.8., 89.31.141.
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| A | Good: Name Server IPv4-addresses from different subnet found:
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| A | Info: IPv6-Subnet-list: 3 Name Servers with IPv6, 1 different subnets (first block): 2a00:, 1 different subnets (first two blocks): 2a00:a8e0:, 2 different subnets (first three blocks): 2a00:a8e0:0001:, 2a00:a8e0:0002:, 2 different subnets (first four blocks): 2a00:a8e0:0001:0000:, 2a00:a8e0:0002:0000:
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| A | Good: Name Server IPv6 addresses from different subnets found.
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| A | Good: Nameserver supports TCP connections: 6 good Nameserver
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| A | Good: Nameserver supports Echo Capitalization: 6 good Nameserver
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| A | Good: Nameserver supports EDNS with max. 512 Byte Udp payload, message is smaller: 6 good Nameserver
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| A | Good: Nameserver has passed 10 EDNS-Checks (OP100, FLAGS, V1, V1OP100, V1FLAGS, DNSSEC, V1DNSSEC, NSID, COOKIE, CLIENTSUBNET): 4 good Nameserver
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| Nameserver doesn't pass all EDNS-Checks: ns.udag.de: OP100: ok. FLAGS: ok. V1: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. V1OP100: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found, no OPT100 expected, no OPT100 found. V1FLAGS: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. DNSSEC: ok. V1DNSSEC: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. NSID: ok (ns-fra-02). COOKIE: ok. CLIENTSUBNET: ok.
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| Nameserver doesn't pass all EDNS-Checks: ns.udag.de / 185.61.8.10: OP100: ok. FLAGS: ok. V1: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. V1OP100: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found, no OPT100 expected, no OPT100 found. V1FLAGS: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. DNSSEC: ok. V1DNSSEC: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. NSID: ok (ns-fra-02). COOKIE: ok. CLIENTSUBNET: ok.
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| Nameserver doesn't pass all EDNS-Checks: ns.udag.de / 2a00:a8e0:1::10: OP100: ok. FLAGS: ok. V1: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. V1OP100: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found, no OPT100 expected, no OPT100 found. V1FLAGS: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. DNSSEC: ok. V1DNSSEC: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. NSID: ok (ns-nue-01). COOKIE: ok. CLIENTSUBNET: ok.
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| Nameserver doesn't pass all EDNS-Checks: ns.udag.net / 89.31.141.10: OP100: ok. FLAGS: ok. V1: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. V1OP100: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found, no OPT100 expected, no OPT100 found. V1FLAGS: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. DNSSEC: ok. V1DNSSEC: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. NSID: ok (ns-fra-02). COOKIE: ok. CLIENTSUBNET: ok.
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| Nameserver doesn't pass all EDNS-Checks: ns.udag.net / 2a00:a8e0:2::10: OP100: ok. FLAGS: ok. V1: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. V1OP100: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found, no OPT100 expected, no OPT100 found. V1FLAGS: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. DNSSEC: ok. V1DNSSEC: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. NSID: ok (ns-nue-02). COOKIE: ok. CLIENTSUBNET: ok.
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| Nameserver doesn't pass all EDNS-Checks: ns.udag.org / 185.61.8.11: OP100: ok. FLAGS: ok. V1: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. V1OP100: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found, no OPT100 expected, no OPT100 found. V1FLAGS: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. DNSSEC: ok. V1DNSSEC: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. NSID: ok (ns-fra-02). COOKIE: ok. CLIENTSUBNET: ok.
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| Nameserver doesn't pass all EDNS-Checks: ns.udag.org / 2a00:a8e0:1::11: OP100: ok. FLAGS: ok. V1: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. V1OP100: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found, no OPT100 expected, no OPT100 found. V1FLAGS: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. DNSSEC: ok. V1DNSSEC: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. NSID: ok (ns-nue-01). COOKIE: ok. CLIENTSUBNET: ok.
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| A | Good: All SOA have the same Serial Number
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| Warning: No CAA entry with issue/issuewild found, every CAA can create a certificate. Read https://en.wikipedia.org/wiki/DNS_Certification_Authority_Authorization to learn some basics about the idea of CAA. Your name server must support such an entry. Not all dns providers support CAA entries.
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| 4. Content- and Performance-critical Checks |
| A | Good: All checks /.well-known/acme-challenge/random-filename without redirects answer with the expected http status 404 - Not Found. Creating a Letsencrypt certificate via http-01 challenge should work. If it doesn't work: Check your vHost configuration (apachectl -S, httpd -S, nginx -T). Every combination of port and ServerName / ServerAlias (Apache) or Server (Nginx) must be unique. Merge duplicated entries in one vHost. If you use an IIS, extensionless files must be allowed in the /.well-known/acme-challenge subdirectory. Create a web.config in that directory. Content: <configuration><system.webServer><staticContent><mimeMap fileExtension="." mimeType="text/plain" /></staticContent></system.webServer></configuration>. If you have a redirect http ⇒ https, that's ok, Letsencrypt follows such redirects to port 80 / 443 (same or other server). There must be a certificate. But the certificate may be expired, self signed or with a not matching domain name. Checking the validation file Letsencrypt ignores such certificate errors. Trouble creating a certificate? Use https://community.letsencrypt.org/ to ask.
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| A | Good: Every https result with status 200 and greater 1024 Bytes is compressed (gzip, deflate, br checked).
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| https://explainr.tv/ 95.216.243.69
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| Warning: Https + http status 200 + Inline CSS / JavaScript found. Don't use inline CSS / JavaScript. These are compiled and re-used ressources, save these with a long Cache-Control max-age - header.
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| https://95.216.243.69/ 95.216.243.69
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| Warning: Https + http status 200 + Inline CSS / JavaScript found. Don't use inline CSS / JavaScript. These are compiled and re-used ressources, save these with a long Cache-Control max-age - header.
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| https://explainr.tv/ 95.216.243.69
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| Warning: Https result with status 200 found, Html-Content is too big. Should be max. 110 %. May contain inline CSS / JavaScript, too much comments or white space. Re-used ressources - create files with a long Cache-Control max-age header. Remove comments and white space.
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| https://95.216.243.69/ 95.216.243.69
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| Warning: Https result with status 200 found, Html-Content is too big. Should be max. 110 %. May contain inline CSS / JavaScript, too much comments or white space. Re-used ressources - create files with a long Cache-Control max-age header. Remove comments and white space.
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| A | Good: Every https connection via port 443 supports the http/2 protocol via ALPN.
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| A | Good: Some script Elements (type text/javascript) with a src-Attribute have a defer / async - Attribute. So loading and executing these JavaScripts doesn't block parsing and rendering the Html-Output.
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| https://explainr.tv/ 95.216.243.69
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| Critical: Some script Elements (type text/javascript) with a src-Attribute don't have a defer / async - Attribute. Loading and executing these JavaScripts blocks parsing and rendering the Html-Output. That's bad if your site is large or the connection is slow / mobile usage. Use "async" if the js file has only functions (so nothing is executed after parsing the file) or is independend. Use "defer" if the order of the scripts is important. All "defer" scripts are executed before the DOMContentLoaded event is fired. Check https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script to see some details.: 12 script elements without defer/async.
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| https://95.216.243.69/ 95.216.243.69
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| Critical: Some script Elements (type text/javascript) with a src-Attribute don't have a defer / async - Attribute. Loading and executing these JavaScripts blocks parsing and rendering the Html-Output. That's bad if your site is large or the connection is slow / mobile usage. Use "async" if the js file has only functions (so nothing is executed after parsing the file) or is independend. Use "defer" if the order of the scripts is important. All "defer" scripts are executed before the DOMContentLoaded event is fired. Check https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script to see some details.: 17 script elements without defer/async.
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| A | Good: All CSS / JavaScript files are sent compressed (gzip, deflate, br checked). That reduces the content of the files. 59 external CSS / JavaScript files found
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| A | Good: All images with internal compression not compressed. Some Images (.png, .jpg, .jpeg, .webp, .gif) are already compressed, so an additional compression isn't helpful. 20 images (type image/png, image/jpg) found without additional GZip. Not required because these images are already compressed
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| Warning: CSS / JavaScript files with a missing or too short Cache-Control header found. Browsers should cache and re-use these files. 1 external CSS / JavaScript files without Cache-Control-Header, 2 with Cache-Control, but no max-age, 4 with Cache-Control max-age too short (minimum 7 days), 52 with Cache-Control long enough, 59 complete.
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| Warning: Images with a missing or too short Cache-Control header found. Browsers should cache and re-use these files. 1 image files without Cache-Control-Header, 1 with Cache-Control, but no max-age, 0 with Cache-Control max-age too short (minimum 7 days), 26 with Cache-Control long enough, 28 complete.
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| A | Good: Some checked attribute values are enclosed in quotation marks (" or ').: 238 Html-Elements checked, 232 without problems.
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| I | Wrong: Attribute values found, not enclosed in quotation marks (" or ').: 6 Html-Elements with attributes and missing enclosed quotation marks found. 6 wrong attributes.
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| A | Good: Some img-elements have a valid alt-attribute.: 25 img-elements found, 16 img-elements with correct alt-attributes (defined, not an empty value).
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| Wrong: img-elements without alt-attribute or empty alt-attribute found. The alt-attribute ("alternative") is required and should describe the img. So Screenreader and search engines are able to use these informations.: 9 img-elements without alt-attribute, 0 img-elements with empty alt-attribute found.
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| A | Good: Domainname is not on the "Specially Designated Nationals And Blocked Persons List" (SDN). That's an US-list of individuals and companies owned or controlled by, or acting for or on behalf of, targeted countries. It also lists individuals, groups, and entities, such as terrorists and narcotics traffickers designated under programs that are not country-specific. Collectively, such individuals and companies are called "Specially Designated Nationals" or "SDNs." Their assets are blocked and U.S. persons are generally prohibited from dealing with them. So if a domain name is on that list, it's impossible to create a Letsencrypt certificate with that domain name. Check the list manual - https://www.treasury.gov/resource-center/sanctions/sdn-list/pages/default.aspx
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| https://explainr.tv/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de
| 2.517 seconds
| Warning: 404 needs more then one second
|
| https://www.explainr.tv/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de
| 2.504 seconds
| Warning: 404 needs more then one second
|
| A | Duration: 118420 milliseconds, 118.420 seconds
|
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