DevOps tools
Web app
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DNS - 
DNS playground - mess with dns: Do weird DNS experiments (set your own DNS records) and see how it works
 
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Public DNS resolvers - Google DNS resolver - 8.8.8.8: DNS query with Google DNS (supports DNSSEC)
- CloudFlare DNS resolver - 1.1.1.1
 
- Google DNS resolver - 
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DNS query - Google DNS - Web App
- Doggo DNS: DNS query
- NsLookup.io: Find all DNS records for a domain name
 
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Test, benchmark your resolver - dnscheck.tools (Part of addr.tools): Which DNS resolver you’re using?
- Check My DNS: What RFCs the clients DNS resolver infrastructure supports?
 
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Test, benchmark pupular resolvers - DNS Speed Test: Find the Fastest DNS Server from Your Location
- DNS Speed Benchmark: Test the performance of your DNS provider from all over the world1.
- DNSPerf (from DigiCert): Compare the speed and uptime of enterprise and commercial DNS services
- Authoritative DNS providers : GoDaddy, CloudFlare, AWS Route53
- Public DNS resolvers : 1.1.1.1,8.8.8.8,9.9.9.9, NextDNS
- DNS Root Servers
 
 
 
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DNSSEC - DNS Viz: Visualizing the status of a DNS zone, understanding and troubleshooting deployment of the DNS Security Extensions (DNSSEC)
- DNSSEC Debugger (From Verisign Labs Tools)
 
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HTTP - HTTP Observatory: How secure a site’s HTTP configuration is
 
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SSL - SSL Server Test: How secure a site’s TLS configuration is
 
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Network - addr.tools: Possibly useful tools for the Internet
 
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Application / End Users - Ad Block Test: Check if your adblock solution is blocking enough hosts
- Cover Your Track: See how trackers view your browser
- myip.addr.tools (Part of addr.tools): What is your IP Address?
- dnscheck.tools (Part of addr.tools): Information about your IP Address (and DNS resolver)
 
CLI
1
dnsperf is available as a CLI app2 that test the performance of a DNS server.
2
                    https://github.com/DNS-OARC/dnsperf