This useful tool for Mx records,DNS records and More Lookup http://mxtoolbox.com/
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! |
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