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Top Forums UNIX for Dummies Questions & Answers how to get the server name using IP address Post 302088584 by mercy on Wednesday 13th of September 2006 10:44:15 AM
Old 09-13-2006
if you want get server name you can use
$ nslookup -t=ptr server_ip
but back resolve must be correct.

If PTR doesn't set -- you cann't get correct server name

there are several methods to get name (if ptr doesn't set) but all they are not certain for sure
This User Gave Thanks to mercy For This Post:
 

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Mail::SPF::Mech::PTR(3) 				User Contributed Perl Documentation				   Mail::SPF::Mech::PTR(3)

NAME
Mail::SPF::Mech::PTR - SPF record "ptr" mechanism class DESCRIPTION
An object of class Mail::SPF::Mech::PTR represents an SPF record mechanism of type "ptr". Constructors The following constructors are provided: new(%options): returns Mail::SPF::Mech::PTR Creates a new SPF record "ptr" mechanism object. %options is a list of key/value pairs representing any of the following options: qualifier domain_spec See "new" in Mail::SPF::Mech. new_from_string($text, %options): returns Mail::SPF::Mech::PTR; throws Mail::SPF::ENothingToParse, Mail::SPF::EInvalidMech Creates a new SPF record "ptr" mechanism object by parsing the string and any options given. Class methods The following class methods are provided: default_qualifier qualifier_pattern See "Class methods" in Mail::SPF::Mech. name: returns string Returns 'ptr'. name_pattern: returns Regexp Returns a regular expression that matches a mechanism name of 'ptr'. Instance methods The following instance methods are provided: text qualifier params stringify See "Instance methods" in Mail::SPF::Mech. domain_spec: returns Mail::SPF::MacroString Returns the "domain-spec" parameter of the mechanism. match($server, $request): returns boolean Checks whether the mechanism's target domain name, or a sub-domain thereof, is a "valid" domain name for the given request's IP address (see "ip_address" in Mail::SPF::Request), and returns true if it does, or false otherwise. See "valid_domain_for_ip_address" in Mail::SPF::Util for how domains are validated. See RFC 4408, 5.5, for the description of an equivalent algorithm. SEE ALSO
Mail::SPF, Mail::SPF::Record, Mail::SPF::Term, Mail::SPF::Mech <http://tools.ietf.org/html/rfc4408> For availability, support, and license information, see the README file included with Mail::SPF. AUTHORS
Julian Mehnle <julian@mehnle.net>, Shevek <cpan@anarres.org> perl v5.18.2 2017-10-06 Mail::SPF::Mech::PTR(3)
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