Found Useful DNS Lookup Tools [Web Based ] viewdns

Code
Reverse IP Lookup



Reverse Whois Lookup



IP History



Reverse MX Lookup

Find all sites that use a given mail server.

    

Reverse NS Lookup

Find all sites that use a given nameserver.



IP Location Finder



Chinese Firewall Test

Checks whether a site is accessible from China.



URL / Domain

    

DNS Propagation Checker

Check whether recent DNS changes have propagated.

    

Iran Firewall Test

Check whether a site is accessible in Iran.    



Get HTTP Headers

    

DNS Record Lookup

View all DNS records for a specified domain.

    

Port Scanner

Check if common ports are open on a server.



Trace the servers between ViewDNS and a remote host.

    

Spam Database Lookup

Determine if your mail server is on any spam lists.

    

Reverse DNS Lookup

View the reverse DNS entry for an IP address.



Lookup information on an ASN.

    

Ping

Test the latency of a remote system from ViewDNS.



Test if any domain name is configured for DNSSEC.



URL / String Decode

Convert a URL with '%##' values to a readable format.



Find the abuse contact address for a domain name.



Determine the manufacturer of a network device.



Free Email Lookup

Determine if a domain provides free email addresses.