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Search PORT description


Domain ptr lookup,check ptr record tool,dns ptr test for exist

This is tool for domain ptr lookup, it's working for domain name and email address. Ptr test going in two steps: first - lookuping domain's IP address and seconde - resolve domain name (canonical name) for currect IP. PTR - Pointer to a canonical name. It's different then CNAME, because DNS processing does NOT proceed, just the name is returned. A PTR record is opposition of an A record. A records resolve domain name to IP address. PTR record resolve IP address to domain name. Why check ptr is important part of anti spam checking? For example IP addresses (like 191.134.23.112) is assigned by a central organization to some fixed ISP. An ISP that 'owns' an IP address can give it to use for some customer, and only this ISP can register a DNS record that - IP address 191.134.23.112 corresponds to the server 112.example.com. Note that only the ISP can do this, not a customer that using this IP during now. This is called "reverse" record, because as usually DNS records looking like name to IP address, but we see that it's IP address to name. Ptr testing and ptr record lookup used by AOL, for example AOL denied to send mail from IP without PTR record: "AOL may no longer accept connections from IP addresses which no do not have reverse-DNS (PTR records) assigned." This ptr record lookup tool created for ptr record check, because it can be useful for webmaster and admin in case of email delivery troubles. As usually email server checking ptr info for find any ptr, in case of record exist - check success and email have chance to be delivider.
Ptr test available with short link: (example:http://my-addr.com/ptr/bbc.com)

This ptr lookup tool support three formats: example.com, emailbox@example.com and http://example.com/. It's allowed to use subdomains too.
new window:
yahoo.com (example of lookup)

PTR record was found

209.191.122.70 -> ir1.fp.vip.mud.yahoo.com
67.195.160.76 -> ir1.fp.vip.ac4.yahoo.com
69.147.125.65 -> ir1.fp.vip.re1.yahoo.com
72.30.2.43 -> ir1.fp.vip.sk1.yahoo.com
98.137.149.56 -> ir1.fp.vip.sp2.yahoo.com