MxToolBox
Monitors the performance of your websites, DNS, and email servers along with blacklist monitoring. Get alerts by e-mail and SMS. Add 1 monitor for free. Plus free online network and DNS lookup tools.
ABOUT THE SUPERTOOL! All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool. Input a domain name or IP Address or Host Name. Links in the results will guide you to other relevant tools and information. And you'll have a chronological history of your results. If you already know exactly what you want, you can force a particular test or lookup. Try some of these examples:
(e.g. "blacklist: 127.0.0.2" will do a blacklist lookup) Command Explanation blacklist: Check IP or host for reputation smtp: Test mail server SMTP (port 25) mx: DNS MX records for domain a: DNS A record IP address for host name spf: Check SPF records on a domain txt: Check TXT records on a domain ptr: DNS PTR record for host name cname: DNS canonical host name to IP address scan: Perform a port scan on the host whois: Get domain registration information arin: Get IP address block information soa: Get Start of Authority record for a domain tcp: Verify an IP Address allows tcp connections http: Verify a URL allows http connections https: Verify a URL allows secure http connections ping: Perform a standard ICMP ping trace: Perform a standard ICMP trace route dns: Check your DNS Servers for possible problems New!
