MXtoolbox

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
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!