- What SSL
- SSL information about a URL.
- W3C CSS Validator Service
- Web Interface to validate your Cascading Style Sheets and (X)HTML documents with style sheets
- W3C Markup Validation Service
- Web Interface to validate your HTML and other markup languages
- W3C Feed Validation Service
- Web Interface to validate your RSS or Atom Feed
- Watchfire WebXACT to test bobby compliance (Commercial)
- 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
- Free tool to verify that Java is working on your browser and what version.
- DNS Tools -- Tool to verify your DNS.
- Web Interface wth various tools for DNS. A fun one is how old your domain name is.
- Network Calculator on Internet
- Web interface to calculate subnet, and supernet numbers on the Internet.
- IP subnet Calculator on Internet
- Web interface to calculate subnet numbers on the Internet. Not as many options as previous entry. -- Thanks Sammy!
- Cloudflare speed test
- Cloudflare speed test that also shows jitter.
- MegaPath Bandwidth Meter (was speakeasy.net)
- MegaPath Bandwidth meter for testing the speed of your Internet Link.
- Speed test by Ookia
- Nice looking speed test by Ookia to the speed of your Internet Link. It requires flash, and javascript.
- Down Detector website
- A Nice website listing many services and reports if they are down or not. Requires javascript.
- ISO Country Codes
- Link to a list of ISO country codes. That domain name with .tm is not trademark, but Turkmenistan.
- Location of ROOT NAME Servers
- Link to a page showing approximate location of the ROOT NAME Servers.
- List of Public DNS Servers
-
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
- Link to a page showing the list of operational registrars for Top Level Domain( TLD) .com, .org, and .net.
- Network Solutions
- Link to a Network Solutions's home page. Network Solutions provides registry services.
- Network Solutions whois page
- Link to a Network Solutions's whois page.
- ARIN
- Link to a ARIN's home page. ARIN provides IP registration for US and others.
- ARIN list of countries and regions
- Link to a ARIN's page that lists countries on regional registries for them.
- ARIN whois page
- Link to a page into ARIN's database of information on IP address alocations.
- IANA
- Link to a IANA's home page.
- IANA URI Schemes
- Link to a IANA's Uniform Resource Identifer (URI) Schemes page.
- Website listing bogon IPs. IPs that are never on the public Internet.
- Link to CYMRU website that lists bogon IPs on the Internet.
- overthewire.org
- 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.
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I use Let's Encrypt certs
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