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	PTR Record \| Men & Mice - DNS, DHCP and IP Address Management Solutions
		A PTR record associates an IP address with a canonical name.
		PTR records should point to a name that can be resolved back to the IP address.
		The name of the pointer record is not the IP address itself, but is the IP address’ four IP octets in reverse order followed by IN-ADDR.ARPA.
	www.menandmice.com /knowledgehub/dnsglossary/ptr.record (80 words)

	DNSrecords
		A-records are the DNS server equivalent of the hosts file - a simple domain name to IP-address mapping.
		A-records are not required for all computers, but is needed for any computer that shares resources on a network.
		This A-record is referred to as a "glue" record, because it doesn't really belong in the parent zone, but is necessary to locate the DNS server for the delegated
	www.ietf.org /IESG/Implementations/RFC1886-Implementation/DNSrecords.html (1957 words)

	Web Hosting Glossary: Advanced DNS Options
		PTR - In general terms, a PTR record provides the opposite functionality of an A record.
		PTR records are often referred to as "reverse DNS".
		We do not recommend making changes to records that you are not familiar with, as this could interfere with the way your domain name functions.
	www.fastvirtual.com /web_hosting_glossary/advanced_dns.html (507 words)

	Assignments Reference Guide
		This means that if you change an existing record, it may take as long as a day before that change becomes visible to some users since their resolvers or name servers might still be answering with cached data from before the change.
		In most cases you will want both A and PTR records to be published in the DNS, but there may be exceptions; for example, if multiple hostnames will be sharing a single IP address then you might not want to publish PTR records for all of its names.
		If your search matched records of more than one type, the results will be listed separately for each record type; you can use the notebook tabs at the top of the window to see the search results for each type of record.
	www.upenn.edu /computing/assignments/manual (4589 words)

	Resource Records
		NS records for a domain must exist in both the zone that delegates the domain and in the domain itself.
		NS record names must have an equivalent A record (that is, they cannot point to an alias).
		The Start of Authority (SOA) record designates the start of a zone and ends at the NS records, but the SOA record must be at the root.
	www.cisco.com /univercd/cc/td/doc/product/rtrmgmt/ciscoasu/nr/nr_2_5/gui_user/a_ap.htm (635 words)

	DNS Records Explained with Syntax and examples, DNS Records Tutorials
		The AAAA record is structured in very much the same way as the A record in both binary and master file formats; it is just much larger.
		The SOA record is a way for the Domain Administrator to give out simple information about the domain like, how often it is updated, when it was last updated, when to check back for more info, what is the admins email address and so on.
		A wildcard DNS record is a record in a DNS zone file that will match all requests for non-existent domain names, i.e.
	www.debianhelp.co.uk /dnsrecords.htm (2562 words)

	"Reverse DNS Lookup" versus PTR record - www.DNSstuff.com Message Board (Site not responding. Last check: 2007-11-01)
		To fix this, it would be best just to have a PTR record for 65.71.107.242 that points to mail.hopecity.com.
		If the CNAME is still needed, though, it would be possible to add a PTR record for mail.hopecity.com (but this is not recommended, as it is guaranteed to confuse people down the line).
		Correct (unless ns2.technov.com is a DNS server of yours, in which case you would need to add a PTR record there for 148.technov.135.28.69.in-addr.arpa).
	forums.dnsstuff.com /tool/post/dnsstuff/vpost?id=493808 (616 words)

	"Relaying temporarily denied. Cannot resolve PTR record for IP address" (Site not responding. Last check: 2007-11-01)
		This error message means that sendmail encountered a "SERVFAIL" during the check_rcpt ruleset when attempting to resolve the DNS PTR record for IP address.
		A DNS PTR record does not necessarily have to exist for an IP address to pass sendmail's check_rcpt ruleset; the lookup may produce an NXDOMAIN.
		In this case, the DNS A records could not be looked up for the authoritative name servers for 132.216.213.in-addr.arpa.
	www.brandonhutchinson.com /Relaying_temporarily_denied._Cannot_resolve_PTR_record_for_IP_address.html (171 words)

	Manpage of DNSWALK (Site not responding. Last check: 2007-11-01)
		X is a PTR record to Y, but the IP address associated with the PTR record is not listed as an address for Y. There should be an A record for every valid IP address for a host.
		X is a PTR record to Y, but Y is a CNAME to Z. PTR records MUST point to the canonical name of a host, not an alias.
		NS records for the parent and child domains should be consistent, and each server listed in the NS record MUST be able to answer with authoritative data, either by being a primary or secondary for the zone.
	www.dca.fee.unicamp.br /cgi-bin/man2html?dnswalk (1225 words)

	HOWTO - Define an SPF Record
		Briefly the design intent of the SPF record is to allow a receiving MTA (Message Transfer Agent) to interrogate the Name Server of the domain which appears in the email (the sender) and determine if the originating IP of the mail (the source) is authorized to send mail for the sender's domain.
		The PTR record is the least preferred solution since it places a load on the IN-ADDR.ARPA (IPv4) or IPV6.ARPA reverse-map domains which generally have less capacity than the gTLD and ccTLD domains.
		The SPF record states that the A record of mail.example.com alone is permitted to send mail for the domain.
	www.zytrax.com /books/dns/ch9/spf.html (2554 words)

	R. T. Russell: BBC BASIC (86) Manual (Site not responding. Last check: 2007-11-01)
		Since most of the records will be smaller than this, we are going to waste quite a lot of space in our random access file, but this is the penalty we pay for convenience and comparative simplicity.
		To start with, let's call the first record on the file 'record zero', the second record 'record 1', the third record 'record 2', etc. The first byte of 'record zero' is at byte zero on the file.
		What we need is to be able to call the first record 'record 1', etc. We could do this without altering the function which calculates the start position of each record, but we would waste the space allocated to 'record 0' since we would never use it.
	www.cix.co.uk /~rrussell/products/bbcbasic/manual/bbcfile3.html (2485 words)

	Ipswitch, Inc. - DNS Help (Site not responding. Last check: 2007-11-01)
		PTR records provide a backwards IP address to name conversion.
		The "A" record is needed in order to resolve the official host name to an IP address.
		Even though the DNS records for a domain may be correct, the mail server may not be able to contact the DNS server (Network trouble, service down) to resolve the domain address which would also cause the delivery to fail.
	www.ipswitch.com /support/imail/dns.asp (1114 words)

	Cisco - DNS Resource Records
		This SOA record identifies what is the best source of information for data within the domain; it contains the current version of the DNS database; and it defines the behavior of a particular DNS server.
		The value of an NS record for a domain is the name of the nameserver for that domain.
		There must be a valid A record in the DNS for the Host.domain.name in order for a command, such as the telnet host.domain.name command, to work (or there must be a CNAME that points to a hostname with a valid A record).
	www.cisco.com /warp/public/105/dns_resource.html (1318 words)

	PTR Record for DNS Server Is Not Automatically Created
		There is a missing or mis-configured PTR record for your DNS server in your reverse lookup zone.
		This seems to indicate that the PTR record has been created and is active, however, it is not true.
		The reverse lookup zone is a database file that is used to allow a client, or resolver, to provide an IP address and request a matching host name.
	support.microsoft.com /kb/171789 (439 words)

	DNS Change Request
		An MX record is used to point e-mail for the domain name to a specific mail server.
		An A Record is a machine name that points to an IP address.
		A PTR Record is used to point to an IP address to a machine name.
	www.verio.com /support/files/dnschange.cfm (269 words)

	Linked List Tutorial
		The record has two parts, the link field to the subsequent record and the data field[s] containing the information you want stored in the linked list.
		The first field in the record is defined to be the record key.
		The function returns an integer value to indicate if a record has been deleted or no record was deleted because the record was not found.
	stsdas.stsci.edu /bps/linked_list.html (1488 words)

	PTR (Reverse) (Site not responding. Last check: 2007-11-01)
		PTR-records are used to map IP addresses to domain names (reverse of A-records).
		The name of a PTR-record is the IP address with the segments reversed and with "in-addr.arpa" appended to the end.
		Right-click a reverse zone in the DNS Records window, and select "New Pointer (PTR-record)" from the pop-up menu.
	www.simpledns.com /help/rec_ptr.htm (116 words)

	ISS
		A PTR record allows system administrators to give a server some level of legitimacy by identifying it to other machines on the internet.
		The same principle applies to PTR records, in that they enable the easy identification of servers on the internet.
		Whilst we appreciate that, particularly in the early stages of the block, this may cause some problems we are confident that the longer term integrity and security of the system can be guaranteed by taking these steps now rather than later.
	www.leeds.ac.uk /iss/email/errors/noptr.htm (442 words)

	MailEnable Knowledge Base - PTR records and how to obtain one
		Therefore the mail server needs to have a PTR record associated with the IP address that it uses to communicate with other servers.
		It is this host that needs to be reconfigured to either pass on the request for the PTR record or respond to the PTR request.
		PTR record exists but the mail server is unable to receive mail from some domains: Article ME020180
	www.mailenable.com /support/diagnostics?Error=DNSError000004 (263 words)

	Zvon - RFC 2181 [Clarifications to the DNS Specification] - Naming issues
		Note that while the value of a PTR record must not be an alias, there is no requirement that the process of resolving a PTR record not encounter any aliases.
		The domain name used as the value of a NS resource record, or part of the value of a MX resource record must not be an alias.
		Searching for either NS or MX records causes "additional section processing" in which address records associated with the value of the record sought are appended to the answer.
	www.zvon.org /tmRFC/RFC2181/Output/chapter10.html (749 words)

	[No title] (Site not responding. Last check: 2007-11-01)
		Using the PTR domain name of the connecting client address is useful because it allows a network owner to publicly distinguish between the two classes of hosts, without needing to report to a central DUL, and without blocking port 25, a policy which some network owners consider drastic.
		Domain owners who publish an SPF record for a given domain name should expect that record to be evaluated in the context of the SPF/PTR test, and ensure their record reflects their domain's policy on whether the named host should be considered an MTA.
		Using a PTR record to go from an IP address to its hostname is often called "Reverse DNS".
	old.openspf.org /unified/20040706/4-ptr.txt (1443 words)

	Adding Reverse Address (PTR) records
		The Reverse Address (PTR) record, in contrast to the Host (A) record, maps an IP address to a Fully Qualified Domain Name (FQDN).
		This type of record is used when a client already has an IP address and wants to determine the DNS name.
		For example, if a client wants to find the FQDN associated with the IP address 192.18.50.1, the client queries for the PTR record of the 1.50.18.192.in-addr.arpa domain name.
	www.ensim.com /Products/Webppliance/demos/wwpro/appliance/help/Appliance/add_ptr_rec.htm (338 words)

	Dns Ptr Record (Site not responding. Last check: 2007-11-01)
		A PTR record is what lets someone do a "reverse" DNS lookup - that is, they have your IP...
		This structure represents a DNS pointer (PTR) record.
		A PTR record is what lets someone do a "reverse" DNS...
	www.dns-information.info /dns/Dns-Ptr-Record/index.php (352 words)

	Basic DNS: PTR Records And Why You Care
		That's also apt to be true for mail spammers, or their PTR doesn't match up: if you do a dig -x on their IP you get a result, but if you look up that result you might not get the same IP you started with.
		Originally, PTR records were just intended as a convenience, and perhaps as a way to be neat and complete.
		There still are no requirements that you have a PTR record or that it be accurate, but because of the abuse of the internet by spammers, certain conventions have grown up.
	www.networknewz.com /2005/0413.html (1102 words)

	Add a pointer (PTR) resource record to a reverse zone: Domain Name System(DNS) (Site not responding. Last check: 2007-11-01)
		PTR resource records created automatically when adding an A resource record to a zone will be deleted automatically if the corresponding A resource record is deleted.
		If this command is not used, the resource record remains in the DNS database unless it is manually updated or removed.
		PTR resource records are deleted automatically if the corresponding A resource record is deleted.
	www.microsoft.com /technet/prodtechnol/windowsserver2003/library/ServerHelp/16F563EE-5658-42F9-877E-7FAE65026AF1.mspx (679 words)

	PTR Record and Wanadoo - www.DNSstuff.com Message Board (Site not responding. Last check: 2007-11-01)
		An automatic reply of Sorbs told me that my PTR record was not helping me because there is not the word « static » or something that said that it’s a static Ip address.
		I called the Wanadoo professional support to change our PTR record, and they didn't know what was a PTR record, so they told me to send a mail to abuse@wanadoo.fr.
		So I called back the Wanadoo professional support and they told me that they were looking for the service that modify the PTR record.
	forums.dnsstuff.com /tool/post/dnsstuff/vpost?id=1206770 (559 words)

	Basic DNS: PTR Records And Why You Care \| Web Hosting Dedicated Server Linux Windows Security Managed Articles Tutorials
		Basic DNS: PTR Records And Why You Care
		Basic DNS: PTR Records And Why You Care
		There still are no requirements that you have a PTR record or that it be
	www.hostlibrary.com /BasicDNSPTRRecordsAndWhyYouCare-reverse-ip.html (893 words)

	Tech-Recipes.com Forums-viewtopic-DNS/BIND resource record: PTR reverse lookup record
		The goal was to show the resource record (the line in the zone file) for a host with an ip address 192.168.5.10 (it was.100, and that was confusing).
		While you can have multiple PTR records for an IP address, the behavior for this is not what you would probably desire.
		The PTR records are not necessary from the Apache perspective, but are a good idea.
	www.tech-recipes.com /modules.php?name=Forums&file=viewtopic&t=161 (827 words)

	Reducing Spam to Nearly Zero with PTR Record Filtering \| [MostlyGeek] Real Estate Technology Blog
		PTR record filtering, a new technique, has proven to be an effective defense against the horde of spam zombies.
		A PTR record is a reverse DNS entry, resolving an IP address to a host name.
		Before PTR record filtering approximately 40K to 50K was allowed through daily.
	www.mostlygeek.com /2007/01/23/ptr-spam-filtering (939 words)

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