- What SSL
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SSL information about a URL.
- W3C CSS Validator Service
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Web Interface to validate your Cascading Style Sheets and (X)HTML documents with style sheets
- W3C Markup Validation Service
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Web Interface to validate your HTML and other markup languages
- W3C Feed Validation Service
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Web Interface to validate your RSS or Atom Feed
- Watchfire WebXACT to test bobby compliance (Commercial)
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This is the only link I can find to test for Bobby compiance. It is commercial company. It only tests one web page. ( Use at own risk )
- Sun Java Version verifier
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Free tool to verify that Java is working on your browser and what version.
- DNS Tools -- Tool to verify your DNS.
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Web Interface wth various tools for DNS. A fun one is how old your domain name is.
- Network Calculator on Internet
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Web interface to calculate subnet, and supernet numbers on the Internet.
- IP subnet Calculator on Internet
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Web interface to calculate subnet numbers on the Internet. Not as many options as previous entry. -- Thanks Sammy!
- Cloudflare speed test
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Cloudflare speed test that also shows jitter.
- MegaPath Bandwidth Meter (was speakeasy.net)
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MegaPath Bandwidth meter for testing the speed of your Internet Link.
- Speed test by Ookia
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Nice looking speed test by Ookia to the speed of your Internet Link. It requires flash, and javascript.
- Down Detector website
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A Nice website listing many services and reports if they are down or not. Requires javascript.
- ISO Country Codes
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Link to a list of ISO country codes. That domain name with .tm is not trademark, but Turkmenistan.
- Location of ROOT NAME Servers
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Link to a page showing approximate location of the ROOT NAME Servers.
- List of Public DNS Servers
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Cloudflare: 1.1.1.1
Google: 8.8.8.8 8.8.4.4
Huricane Electric: 74.82.42.42
Level3: 209.244.0.3, 209.244.0.4
OpenDNS: 208.67.222.222, 208.67.220.220
Verisign: 64.6.64.6, 64.6.65.6
Verizon: 4.2.2.1, 4.2.2.6
- Operational registrars for .com, .org, .net
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Link to a page showing the list of operational registrars for Top Level Domain( TLD) .com, .org, and .net.
- Network Solutions
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Link to a Network Solutions's home page. Network Solutions provides registry services.
- Network Solutions whois page
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Link to a Network Solutions's whois page.
- ARIN
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Link to a ARIN's home page. ARIN provides IP registration for US and others.
- ARIN list of countries and regions
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Link to a ARIN's page that lists countries on regional registries for them.
- ARIN whois page
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Link to a page into ARIN's database of information on IP address alocations.
- IANA
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Link to a IANA's home page.
- IANA URI Schemes
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Link to a IANA's Uniform Resource Identifer (URI) Schemes page.
- Website listing bogon IPs. IPs that are never on the public Internet.
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Link to CYMRU website that lists bogon IPs on the Internet.
- overthewire.org
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Website offering fun games to teach security concepts. Start with Bandit that is easy, then do Natas. No cheating even if it takes you days to figure out the answer.
Return to my home page: My home page
I use Let's Encrypt certs
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