1. MXTOOLBOX:

One of the most popular website to check MX Records, Blacklist Status, SPF, DKIM, DNS, OPEN Ports etc …

website: http://www.mxtoolbox.com

2. WHATISMYDNS:

Want to check the global propogation status of your DNS records ? WHATISMYDNS is the right online tool

website: http://www.whatismydns.net

3. HOST-TRACKER:

Want to know whether your website is accessible globally ? HOST-TRACKER is the right tool

website: http://www.host-tracker.com/

4. SPFWIZARD:

Need to create an SPF and does not know how to do it, SPFWIZARD is the right tool for you

website: http://www.spfwizard.net/

5. PINGDOM:

Want to know your website performance and speed report, PINGDOM is the right tool

website: http://tools.pingdom.com/

6. INTODNS:

INTODNS makes it very easy to diagnose the DNS health of any domain

website: http://intodns.com/

7. UPTIMEROBOT:

Want to monitor a website for downtime ? UPTIMEROBOT is your tool, free to signup and 50 free monitors at a 5minite interval checks.

website: https://uptimerobot.com/

8. PING.EU:

PING.EU contains all the popular network tools like PING, TRACEROUTE, DNS Lookup, PORT Check, PTR Lookup etc …

website: http://ping.eu/

9. CENTRALOPS:

Ping, TRACEROUTE, TCP Query, Who.is, Domain check using CENTRALOPS.

website: https://centralops.net

10. WHOIS:

Domain Registration, WHOIS, Nameserver and DNS lookup tool

website: https://who.is/