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Tools
Reverse DNS
Reverse IP Lookup
WHOIS Information
Domain Location
Hosting Checker
Domain Search
Key Generator
Self-signed SSL Generator
DNS Checker
https://www.whatsmydns.net/
- web site propogration
How to find all subdomains of a domain
Search for hosts/SSL
SSL Checker
https://www.ssllabs.com/ssltest/
https://www.sslshopper.com/ssl-checker.html
Online Malware Scanner
https://sitecheck.sucuri.net
Site Checker
https://geopeeker.com
https://shotsherpa.com
https://www.browserling.com
https://search.google.com/test/rich-results
Google Search Console
https://search.google.com/test/mobile-friendly
Web site Tools
https://www.uptrends.com/tools/traceroute
Site Speed
https://gtmetrix.com
https://developers.google.com/speed/pagespeed/insights/
https://tools.pingdom.com/fpt/
https://developers.facebook.com/tools/debug/og/object/
https://www.uptrends.com/tools/uptime
Email Checker
mail-tester.com
- Test the Spammyness of your Emails.
https://dkimvalidator.com/
- Test SPF/DKIM/DMAC.
MXtoolbox.com
- Text your DNS MX records.
SenderScore.org
- Know your sender reputation
https://www.checktls.com/TestReceiver
IP
https://ip.serverok.in
https://search.censys.io/
- Find website IP address history.
WHOIS
Domain Dossier
https://internic.net/whois.html
- check IP of name server
Security
shodan.io
- Shodan is the world's first search engine for Internet-connected devices. Discover how Internet intelligence can help you make better decisions.
CIDR
https://www.ultratools.com/tools/netMask
- CIDR to Netmask (for hosts.allow)
https://ip2cidr.com
https://cidrcalculator.com/ipv4/ip-range-to-cidr/?cy=USD
http://www.subnet-calculator.com/cidr.php
- IP CIDR Calculator
DNS Checking
http://www.dnsinspect.com
http://www.dnsstuff.com/tools
http://www.intodns.com
http://dnscheck.pingdom.com
http://ViewDNS.info
Ping
https://www.dnsstuff.com/tools
https://host-tracker.com/
- Check your site availability in different country
TraceRoute
https://www.traceroute.org
- Traceroute from various locations
https://tools.pingdom.com/ping/
File System
https://www.clonespy.com
- Remove Duplicate files
Malware
https://sitecheck.sucuri.net/scanner/
- Scan site for malware
https://www.unmaskparasites.com
https://www.stopbadware.org/clearinghouse/search
Domain
https://www.domainsbot.com
https://www.whois.sc